LM2596全中文资料

S5ULM2596资料

Elektronische Bauelemente01-Jun-2002 Rev. A Page 1 of 8REF . REF .MillimeterMillimeterElektronische BauelementePage 2 of 8Block DiagramFEEDBACKPin FunctionPIN#FUNCTION1 This is the positive input supply for the IC switching regulator. A suitable input must be present at this pin to minimize voltage transients and to supply the switching needed by regulator.2 Internal switch. The voltage at this pin switches between (+V IN – V SAT ) and approximately -0.5V, with a duty cycle of approximately V OUT /V IN . To minimize coupling to sensitive circuit, the PC board copper area connected to this pin should be keep to a minimum.3 Circuit ground4Senses the regulated output voltage to complete the feedback loop12VUnregulated680332201N5824680S5ULM2596-5.0 DC InputPage 3 of 801-Jun-2002 Rev. A Page 4 of 8Normalized Output Voltage Line RegulatorEfficiency Switch Saturation VoltageSwitch Current Limit Dropout Voltage/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 5 of 8Elektronische BauelementeOperating Quiescent Current Shutdown Quiescent Current Minimum Operating Supply Voltage ON/OFF Threshold VoltageON/OFF Pin Current (Sinking)Switching Frequency/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 6 of 801-Jun-2002 Rev. A Page 7 of 8tp:/// Any changing of specification will not be informed individual Elektronische BauelementeFeedback Pin BiasContinuous Mode Switching Waveforms Horizontal Time Base: 2 sDiscontinuous Mode Switching Waveforms Horizontal Time Base: 2 sLoad Transient Response for Continuous Mode100 sHorizontal Time Base: 200 s /dLoad Transient Response for Discontinuous Mode Horizontal Time Base:01-Jun-2002 Rev. A Page 8 of 8Elektronische BauelementeV out=VREF*(1+R2/R1) Where VREF=1.23V R2=R1*(Vout/VREF-1)Select R1 to be approximately 1k , use a 1% resistor for best stability. Cin-- 470uF, 50V , Aluminum Electrolytic Cout-- 220uF, 35V Aluminum Electrolytic D1-- 5A, 40V Schottky Rectifer, 1N5825 L1-- 68uH Figure 2 Standard Test Circuits and Layout GuidesCin-- 470uF, 50V , Aluminum Electrolytic Cout-- 220uF, 25V Aluminum Electrolytic D1-- 5A, 40V Schottky Rectifer, 1N5825 L1-- 68uHS5ELM2596。

LM2596中文资料

PCB 的另一面覆盖有面积约为 16 平方英寸铜箔。注14： LM2596T-3.3, LM2596T-5.0, LM2596T-12， LM2596T-ADJ为TO-220封装（DIP）；
LM2596S-3.3, LM2596S-5.0,LM2596S-12， LM2596S-ADJ为TO-263封装（SMT）。
η
效率
VIN=12V，ILOAD=3A
73
LM2596□—5.0 （见注 14）
VOUT
输出电压
5.0 7V≤VIN≤40V， 0.2A≤ILOAD≤3A
η
效率
VIN=12V，ILOAD=3A
80
3.168/3.135 3.432/3.465
V V（min） V（max） %
4.800/4.750 5.200/5.250
2 30
A A(min) A(max) μA(max) mA mA(max)
IQ
静电流
见注 9
5 10
mA mA(max)
ISTBY
待机静电流
ON/OFF 脚=5V（OFF）（9）
80
μA
200/250
μA(max) ３
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LM2596 开关电压调节器 SEPTEMBER， 2004
ILOAD=500mA。（见注 14）
361 符号
参量
cu 器件参数
.m Ib
反馈偏置电流
wwwfO
振荡器频率
条件
LM2596□—XX
典型值（2）极限值（3）
单位
只适用于输出可调节的情况，VFB=1.3V

LM2596

特点
※ 3.3V、5V、12V 的固定电压输出和可调电压输出 ※ 可调输出电压范围 1.2V～37V±4% ※ 输出线性好且负载可调节 ※ 输出电流可高达 3A ※ 输入电压可高达 40V ※ 采用 150KHz 的内部振荡频率，属于第二代开关电压调节器，功耗小、效率高 ※ 低功耗待机模式，IQ 的典型值为 80μA ※ TTL 断电能力 ※ 具有过热保护和限流保护功能 ※ 封装形式：TO-220（T）和 TO-263（S） ※ 外围电路简单，仅需 4 个外接元件，且使用容易购买的标准电感
范围
最大电源电压
45
脚输入电压Biblioteka -0.3～25“反馈”脚电压
-0.3～25
到地的输出电压（静态）
-1
功耗
由内部限定
储存温度
-65～150
静电释放（人体放电 1）
2000
气流焊（60 秒）
215
焊接时的管脚
TO-263
红外线焊接（10 秒）
245
温度
TO-220
波峰焊/电烙铁焊接（10 秒）
260
最高结温
η
效率
VIN=12V，ILOAD=3A
80
3.168/3.135 3.432/3.465
V V（min） V（max） %
4.800/4.750 5.200/5.250
V V（min） V（max） %
２
LM2596 开关电压调节器 SEPTEMBER， 2004
符号
参量
条件
LM2596□—12 （见注 14）
R1----1K，1%
D1----5A/40V IN5825 L1---68μH
CFF----参照有关的应用信息

lm2596中文资料

VIN=25V，VOUT =3V， ILOAD=3A
η
效率
VIN=25V，VOUT =15V，ILOAD=3A
电气特性（所有输出）
典型值（2）极限值（3）
单位
12.0
88 1.230
73 90
11.52/11.40 12.48/12.60
V V（min） V（max） %
1.193/1.180 1.267/1.280
2000
V
气流焊（60 秒）
215
℃
焊接时的管脚
TO-263
温度
红外线焊接（10 秒）
245
℃
TO-220
波峰焊/电烙铁焊接（10 秒）
260
℃
最高结温
150
℃
工作条件
温度范围电源电压
-40～125
℃
4.5～40
V
注 1：人体放电模式相当于一个 100PF 的电容通过一个 1.5K 的电阻向每个管脚放电。
电气特性
说明：标准字体对应的项目适合于 TJ=25℃时，带下划线的粗斜体字对应的项目适合于整个温度范围；系统参量(4) 测试电路见图 1
符号
参量
条件
典型值（2）
极限值（3）
单位
LM2596□—3.3 （见注 14）
VOUT
输出电压
3.3 4.75V≤VIN≤40V，
0.2A≤ILOAD≤3A
η
效率
A(max)
50
μA(max)
2 30
mA mA(max)
5 10
mA mA(max)
80
μA
200/250
μA(max) ˏ

lm2596中文资料

VFB
反馈电压
0.2A≤ILOAD≤3A
VOUT 调为 3V，电路图见图 1
η
效率
VIN=25V，VOUT =3V， ILOAD=3A
VIN=25V，VOUT =15V，ILOAD=3A
电气特性（所有输出）
典型值（2）极限值（3）
单位
12.0
88 1.230
73 90
11.52/11.40 12.48/12.60
特点
※ 3.3V、5V、12V 的固定电压输出和可调电压输出 ※ 可调输出电压范围 1.2V～37V±4% ※ 输出线性好且负载可调节 ※ 输出电流可高达 3A ※ 输入电压可高达 40V ※ 采用 150KHz 的内部振荡频率，属于第二代开关电压调节器，功耗小、效率高 ※ 低功耗待机模式，IQ 的典型值为 80μA ※ TTL 断电能力 ※ 具有过热保护和限流保护功能 ※ 封装形式：TO-220（T）和 TO-263（S） ※ 外围电路简单，仅需 4 个外接元件，且使用容易购买的标准电感
５
TO-263 封装（S）尺寸图
单位：英寸/毫米
TO-220 封装（T）尺寸图
单位：英寸/毫米
６
设计步骤及实例
固定输出调节器的设计步骤
条件：VOUT=3.3（或 5 、或 12）V , VIN（max）为最大直流输入电压, ILOAD（max）为最大负载电流步骤： 1. 电感的选择（L1） A．要根据图 4、图 5 和图 6 所示的数据选择电感的适当值（分别对应输出电压为 3.3V、5V 和 12V），对于所有的
符号
参量
器件参数
Ib
反馈偏置电流
fO
振荡器频率
VSAT

lm2596-3.3__LM2596-ADJ_LM2596-12_LV2596-3.3_中文资料

见注 9
5 10
mA mA(max)
ISTBY
待机静电流
ON/OFF 脚=5V（OFF）（9）
80
μA
200/250
μA(max)

３
符号
参量
条件
θJC
θJA
θJA
热阻
θJA
θJA
ON/OFF 控制（测试电路见图 1）
TO-220 或 TO-263 TO-263（10） TO-263（11） TO-263（12） TO-263（13）
V V(max)
最大工作周期（ON） DC
最小工作周期(OFF）
见注 7 见注 8
100
%
0
%
ICL
极限电流
峰值电流（6，7）
4.5 3.6/3.4
A A(min)
6.9/7.5
A(max)
输出为 0V（6，8）
50
μA(max)
IL
输出漏电流
输出为-1V（9）
2 30
mA mA(max)
IQ
静电流
特点
※ 3.3V、5V、12V 的固定电压输出和可调电压输出 ※ 可调输出电压范围 1.2V～37V±4% ※ 输出线性好且负载可调节 ※ 输出电流可高达 3A ※ 输入电压可高达 40V ※ 采用 150KHz 的内部振荡频率，属于第二代开关电压调节器，功耗小、效率高 ※ 低功耗待机模式，IQ 的典型值为 80μA ※ TTL 断电能力 ※ 具有过热保护和限流保护功能 ※ 封装形式：TO-220（T）和 TO-263（S） ※ 外围电路简单，仅需 4 个外接元件，且使用容易购买的标准电感
ON/OFF 脚逻辑输入

LM2596全中文资料随着电子技术的发展，各种电子设备越来越多，而其中一个重要的电源管理模块就是开关电源。

在电子设备中，开关电源起着将交流电转换为直流电的作用，提供稳定可靠的电力供应。

而LM2596是一种常见的开关稳压模块，它被广泛应用于各种电子设备中，提供高效、稳定的电源管理解决方案。

LM2596是一款具有高效率、低功耗和稳定性的降压型开关稳压模块。

它能够将输入电压转换为相对稳定的输出电压，通常被用于降低电源电压供应至微控制器、电路板、传感器等部件。

同时，LM2596还具备短路保护、过热保护等功能，以确保电子设备的安全运行。

LM2596采用了开关型调制控制技术，能够在不同负载情况下自动调整开关频率和占空比，以保持输出电压稳定。

它的输入电压范围广，可以适应不同的电源输入，包括交流电和直流电。

而输出电压可通过外部电阻分压调整，从而满足不同电子设备的需求。

除了稳压功能，LM2596还具备过流保护功能。

当电流超过设定值时，它会自动切断输出，避免因电流过大而损坏电子设备。

同时，LM2596还配备了过热保护功能，当温度超过一定范围时，它会自动降低工作频率或停止工作，以防止过热引起故障。

LM2596作为一种常见的开关稳压模块，其技术参数和应用案例都有详尽的中文资料可供参考。

对于初学者而言，这些资料不仅提供了LM2596的基本工作原理和使用方法，还介绍了它在各种电子设备中的具体应用场景和性能要求。

其中，电路图、元器件清单和详细的步骤说明，使得初学者能够更好地理解和使用LM2596。

此外，还有一些中文论坛和社区提供了关于LM2596的技术讨论和使用心得的帖子。

这些帖子通常包含了实际应用中遇到的问题和解决方案，对于学习和掌握LM2596的使用具有很大帮助。

在这些中文论坛中，你可以与其他电子爱好者交流经验，共同探讨LM2596的使用技巧。

综上所述，LM2596作为一种常见的开关稳压模块，提供了高效、稳定的电源管理解决方案。

LM2596R-3.3中文资料

元器件交易网3.0A, 150Khz, Step-Down Switching RegulatorFEATURES3.3V, 5.0V, 12V, 15V, and Adjustable Output Versions Adjustable Version Output Voltage Range, 1.23 to 37V +/- 4%. Maximum Over Line and Load Conditions Guaranteed 3.0A Output Current Wide Input Voltage Range Requires Only 4 External Components 150Khz Fixed Frequency Internal Oscillator TTL Shutdown Capability, Low Power Standby Mode High Efficiency Uses Readily Available Standard Inductors Thermal Shutdown and Current Limit Protection Moisture Sensitivity Level(MSL) Equals1 TO-263(D2) TO-220V TO-220LM2596ApplicationsSimple High-Efficiency Step-Down(Buck) Regulator Efficient Pre-Regulator for Linear Regulators On-Card Switching Regulators Positive to Negative Converter(Buck-Boost) Negative Step-Up Converters Power Supply for Battery Chargers1. 2. 3. 4. 5. Vin Output Ground Feedback On/OffDESCRIPTIONThe LM2596 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regualtor(buck converter). All circuits of this series are capable of driving a 3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V,12V, 15V, and an adjustable output version.ORDERING INFORMATIONDevice LM2596T-X.X LM2596TV-X.X LM2596R Marking LM2596T-X.X LM2596T-X.X LM2596R-X.X Package TO-220 TO-220V TO-263These regulatiors were designed to minimize the number of externalcomponents to simplify the power supply design. Standard series of inductors optimized for use with the LM2576 are offered by several different inductor manufacturers. Since the LM2596 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal limear reguators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2596 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. The LM2596 features include a guaranteed +/- 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-15% on the oscillator frequency (+/- 2% over 0oC to 125 oC). External shutdown is included, featuring 80 uA(typical) standby current. The output switch includes cycle-bycycle current limiting, as well as thermal shutdown for full protection under fault conditions.HTC1Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTypical Application (Fixed Output Voltage Versions)LM2596LM2596-5.033 uH680 uF1N5824220 uFFigure 1. Block Diagram and Typical ApplicationABSOLUTE MAXIMUM RATINGS(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)Power DissipationTO-220, 5-LeadThermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-caseTO-263Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-caseHTC2Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to befunctional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.)ELECTRICAL CHARACTERISTICS / SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 2) (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.)LM2596-3.3 ([ Note 1]. Test Circuit Figure 2 )73 LM2596-5.0 ([ Note 1]. Test Circuit Figure 2 ) 180 LM2596-12 ([ Note 1]. Test Circuit Figure 2 )90 LM2596-15 ([ Note 1]. Test Circuit Figure 2 )98 LM2596-ADJ ([ Note 1]. Test Circuit Figure 2 )73HTC3Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorELECTRICAL CHARACTERISTICS / Device ParametersLM2596(Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values Tj = 25°C, for min/max values Tj is the operating junction temperature range that applies [Note 2], unless otherwise noted.)10 0 127 110 15050 100 173 1731.16 01.4 1.53.6 3.4100 4.5 6.9 7.5 50 30 1002 5 00 2 0 2.0 2.0 2 V LOGIC = 2.5V (Regulator OFF) V LOGIC = 0.5V (Regulator ON) 5 0.02 1.3 1.32500.6 0.6 15 5.001. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2596 is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section . 2. Tested junction temperature range for the LM2596 : TLOW = –0°C THIGH = +125°C 3. The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. 4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin. 5. Feedback (Pin 4) removed from output and connected to 0 V. 6. Feedback (Pin 4) removed from output and connected to +12 V for the Adjustable, 3.3 V, and 5.0V ersions, and +25 V for the 12 V and15 V versions, to force the output transistor “off”. 7. Vin = 40 V.HTC4Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2)LM2596HTC5Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2)Feedback Pin Bias CurrentLM2596HTC6Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTest Circuit and Layout GuidelinesLM2596Figure 2. Typical Test Circuits and Layout GuideAs in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible. For best results, external components should be located as close to the switcher lC as possible using ground plane construction or single point grounding. If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor. Allowing the inductor flux to intersect sensitive feedback, lC groundpath and COUT wiring can cause problems. When using the adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor.HTC7Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PIN FUNCTION DESCRIPTION Symbol 1VinDescription This pin is the positive input supply for the LM2596 step–down switching23 45regulator.In order to minimize voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present .(Cin in Figure 1). Output This is the emitter of the internal switch. The saturation voltage Vsat of this output switch is typically 1.5 V. It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling to sensitive circuitry. Circuit ground pin. See the information about the printed circuit board layout. Gnd Feedback This pin senses regulated output voltage to complete the feedback loop. The signal is divided by the internal resistor divider network R2, R1 and applied to the non–inverting input of the internal error amplifier. In the Adjustable version of the LM2596 switching regulator this pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to allow programming of the output voltage. ON/OFF It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply current to approximately 80 mA. The threshold voltage is typically 1.4 V. Applying a voltage above this value (up to +Vin) shuts the regulator off. If the voltage applied to this pin is lower than 1.4V or if this pin is left open, the regulator will be in the "on" conditionHTC8Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PACKAGES DIMENSION : TO220-5LHTC9Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorPACKAGES DIMENSION : TO220V-5LLM2596HTC10Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PACKAGES DIMENSION : TO263-5LHTC11Oct 2004 - Rev 0。

lm2596详细参数

LM2596SIMPLE SWITCHER ®Power Converter 150kHz 3A Step-Down Voltage RegulatorGeneral DescriptionThe LM2596series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck)switching regulator,capable of driving a 3A load with excellent line and load regulation.These devices are avail-able in fixed output voltages of 3.3V,5V,12V,and an adjust-able output version.Requiring a minimum number of external components,these regulators are simple to use and include internal frequency compensation †,and a fixed-frequency oscillator.The LM2596series operates at a switching frequency of 150kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regu-lators.Available in a standard 5-lead TO-220package with several different lead bend options,and a 5-lead TO-263surface mount package.A standard series of inductors are available from several dif-ferent manufacturers optimized for use with the LM2596se-ries.This feature greatly simplifies the design of switch-mode power supplies.Other features include a guaranteed ±4%tolerance on out-put voltage under specified input voltage and output load conditions,and ±15%on the oscillator frequency.External shutdown is included,featuring typically 80µA standby cur-rent.Self protection features include a two stage frequency reducing current limit for the output switch and an over tem-perature shutdown for complete protection under fault condi-tions.Featuresn 3.3V,5V,12V,and adjustable output versionsn Adjustable version output voltage range,1.2V to 37V ±4%max over line and load conditions n Available in TO-220and TO-263packages n Guaranteed 3A output load current n Input voltage range up to 40Vn Requires only 4external componentsn Excellent line and load regulation specifications n 150kHz fixed frequency internal oscillator n TTL shutdown capabilityn Low power standby mode,I Q typically 80µA n High efficiencyn Uses readily available standard inductorsn Thermal shutdown and current limit protectionApplicationsn Simple high-efficiency step-down (buck)regulator n On-card switching regulators n Positive to negative converterNote:†Patent Number 5,382,918.Typical Application(Fixed Output Voltage Versions)SIMPLE SWITCHER ®and Switchers Made Simple ®are registered trademarks of National Semiconductor Corporation.DS012583-1December 1997LM2596SIMPLE SWITCHER Power Converter 150kHz 3A Step-Down Voltage Regulator©1999National Semiconductor Corporation 查询LM2596供应商Connection Diagrams and Ordering InformationBent and Staggered Leads,Through HolePackage5-Lead TO-220(T)DS012583-2Order Number LM2596T-3.3,LM2596T-5.0,LM2596T-12or LM2596T-ADJ See NS Package Number T05DSurface Mount Package 5-Lead TO-263(S)DS012583-3Order Number LM2596S-3.3,LM2596S-5.0,LM2596S-12or LM2596S-ADJ See NS Package Number TS5B 2Absolute Maximum Ratings(Note1)If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Supply Voltage45V ON/OFF Pin Input Voltage−0.3≤V≤+25V Feedback Pin Voltage−0.3≤V≤+25V Output Voltage to Ground(Steady State)−1V Power Dissipation Internally limited Storage Temperature Range−65˚C to+150˚C ESD SusceptibilityHuman Body Model(Note2)2kV Lead TemperatureS PackageVapor Phase(60sec.)+215˚C Infrared(10sec.)+245˚C T Package(Soldering,10sec.)+260˚C Maximum Junction Temperature+150˚COperating ConditionsTemperature Range−40˚C≤T J≤+125˚C Supply Voltage 4.5V to40VLM2596-3.3Electrical CharacteristicsSpecifications with standard type face are for T J=25˚C,and those with boldface type apply over full Operating Tempera-ture RangeSymbol Parameter ConditionsLM2596-3.3Units(Limits) Typ(Note3)Limit(Note4)SYSTEM PARAMETERS(Note5)Test Circuit Figure1V OUT Output Voltage 4.75V≤V IN≤40V,0.2A≤I LOAD≤3A 3.3V3.168/3.135V(min)3.432/3.465V(max)ηEfficiency V IN=12V,I LOAD=3A73%LM2596-5.0Electrical CharacteristicsSpecifications with standard type face are for T J=25˚C,and those with boldface type apply over full Operating Tempera-ture RangeSymbol Parameter ConditionsLM2596-5.0Units(Limits) Typ(Note3)Limit(Note4)SYSTEM PARAMETERS(Note5)Test Circuit Figure1V OUT Output Voltage7V≤V IN≤40V,0.2A≤I LOAD≤3A 5.0V4.800/4.750V(min)5.200/5.250V(max)ηEfficiency V IN=12V,I LOAD=3A80%LM2596-12Electrical CharacteristicsSpecifications with standard type face are for T J=25˚C,and those with boldface type apply over full Operating Tempera-ture RangeSymbol Parameter ConditionsLM2596-12Units(Limits) Typ(Note3)Limit(Note4)SYSTEM PARAMETERS(Note5)Test Circuit Figure1V OUT Output Voltage15V≤V IN≤40V,0.2A≤I LOAD≤3A12.0V11.52/11.40V(min)12.48/12.60V(max)ηEfficiency V IN=12V,I LOAD=3A90%3LM2596-ADJElectrical CharacteristicsSpecifications with standard type face are for T J=25˚C,and those with boldface type apply over full Operating Tempera-ture RangeSymbol Parameter ConditionsLM2596-ADJUnits(Limits) Typ(Note3)Limit(Note4)SYSTEM PARAMETERS(Note5)Test Circuit Figure1V FB Feedback Voltage 4.5V≤V IN≤40V,0.2A≤I LOAD≤3A 1.230VV OUT programmed for3V.Circuit of Figure1 1.193/1.180V(min)1.267/1.280V(max)ηEfficiency V IN=12V,V OUT=3V,I LOAD=3A73%All Output Voltage VersionsElectrical CharacteristicsSpecifications with standard type face are for T J=25˚C,and those with boldface type apply over full Operating Tempera-ture Range.Unless otherwise specified,V IN=12V for the3.3V,5V,and Adjustable version and V IN=24V for the12V ver-sion.I LOAD=500mASymbol Parameter ConditionsLM2596-XXUnits(Limits) Typ(Note3)Limit(Note4)DEVICE PARAMETERSI b Feedback Bias Current Adjustable Version Only,V FB=1.3V10nA50/100nA(max) f O Oscillator Frequency(Note6)150kHz127/110kHz(min)173/173kHz(max) V SAT Saturation Voltage I OUT=3A(Notes7,8) 1.16V1.4/1.5V(max) DC Max Duty Cycle(ON)(Note8)100% Min Duty Cycle(OFF)(Note9)0I CL Current Limit Peak Current(Notes7,8) 4.5A3.6/3.4A(min)6.9/7.5A(max)I L Output Leakage Current Output=0V(Notes7,9)50µA(max)Output=−1V(Note10)2mA30mA(max) I Q Quiescent Current(Note9)5mA10mA(max)I STBY Standby QuiescentCurrent ON/OFF pin=5V(OFF)(Note10)80µA200/250µA(max)θJC Thermal Resistance TO-220or TO-263Package,Junction to Case2˚C/W θJA TO-220Package,Junction to Ambient(Note11)50˚C/W θJA TO-263Package,Junction to Ambient(Note12)50˚C/W θJA TO-263Package,Junction to Ambient(Note13)30˚C/W θJA TO-263Package,Junction to Ambient(Note14)20˚C/W ON/OFF CONTROL Test Circuit Figure1ON/OFF Pin Logic Input 1.3VV IH Threshold Voltage Low(Regulator ON)0.6V(max) V IL High(Regulator OFF) 2.0V(min)4All Output Voltage VersionsElectrical Characteristics(Continued)Specifications with standard type face are for T J=25˚C,and those with boldface type apply over full Operating Tempera-ture Range.Unless otherwise specified,V IN=12V for the3.3V,5V,and Adjustable version and V IN=24V for the12V ver-sion.I LOAD=500mASymbol Parameter ConditionsLM2596-XXUnits(Limits) Typ(Note3)Limit(Note4)ON/OFF CONTROL Test Circuit Figure1I H ON/OFF Pin Input Current V LOGIC=2.5V(Regulator OFF)5µA15µA(max) I L V LOGIC=0.5V(Regulator ON)0.02µA5µA(max) Note1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Operating Ratings indicate conditions for which the device is in-tended to be functional,but do not guarantee specific performance limits.For guaranteed specifications and test conditions,see the Electrical Characteristics. Note2:The human body model is a100pF capacitor discharged through a1.5k resistor into each pin.Note3:Typical numbers are at25˚C and represent the most likely norm.Note4:All limits guaranteed at room temperature(standard type face)and at temperature extremes(bold type face).All room temperature limits are100%produc-tion tested.All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control(SQC)methods.All limits are used to calculate Average Outgoing Quality Level(AOQL).Note5:External components such as the catch diode,inductor,input and output capacitors,and voltage programming resistors can affect switching regulator sys-tem performance.When the LM2596is used as shown in the Figure1test circuit,system performance will be as shown in system parameters section of Electrical Characteristics.Note6:The switching frequency is reduced when the second stage current limit is activated.The amount of reduction is determined by the severity of current over-load.Note7:No diode,inductor or capacitor connected to output pin.Note8:Feedback pin removed from output and connected to0V to force the output transistor switch ON.Note9:Feedback pin removed from output and connected to12V for the3.3V,5V,and the ADJ.version,and15V for the12V version,to force the output transistor switch OFF.Note10:V IN=40V.Note11:Junction to ambient thermal resistance(no external heat sink)for the TO-220package mounted vertically,with the leads soldered to a printed circuit board with(1oz.)copper area of approximately1in2.Note12:Junction to ambient thermal resistance with the TO-263package tab soldered to a single printed circuit board with0.5in2of(1oz.)copper area.Note13:Junction to ambient thermal resistance with the TO-263package tab soldered to a single sided printed circuit board with2.5in2of(1oz.)copper area. Note14:Junction to ambient thermal resistance with the TO-263package tab soldered to a double sided printed circuit board with3in2of(1oz.)copper area on the LM2596S side of the board,and approximately16in2of copper on the other side of the p-c board.See Application Information in this data sheet and the thermal model in Switchers Made Simple™version4.3software.Typical Performance Characteristics(Circuit of Figure1)NormalizedOutput VoltageDS012583-4Line RegulationDS012583-5EfficiencyDS012583-6 5Typical Performance Characteristics(Circuit of Figure 1)(Continued)Switch Saturation VoltageDS012583-7Switch Current Limit DS012583-8Dropout VoltageDS012583-9OperatingQuiescent CurrentDS012583-10ShutdownQuiescent CurrentDS012583-11Minimum Operating Supply VoltageDS012583-12ON /OFF Threshold VoltageDS012583-13ON /OFF PinCurrent (Sinking)DS012583-14Switching FrequencyDS012583-15 6Typical Performance Characteristics(Circuit of Figure 1)(Continued)Typical Performance CharacteristicsFeedback Pin Bias CurrentDS012583-16Continuous Mode Switching Waveforms V IN =20V,V OUT =5V,I LOAD =2AL =32µH,C OUT =220µF,C OUT ESR =50m ΩDS012583-17A:Output Pin Voltage,10V/div.B:Inductor Current 1A/div.C:Output Ripple Voltage,50mV/div.Horizontal Time Base:2µs/div.Discontinuous Mode Switching Waveforms V IN =20V,V OUT =5V,I LOAD =500mAL =10µH,C OUT =330µF,C OUT ESR =45m ΩDS012583-18A:Output Pin Voltage,10V/div.B:Inductor Current 0.5A/div.C:Output Ripple Voltage,100mV/div.Horizontal Time Base:2µs/div.Load Transient Response for Continuous Mode V IN =20V,V OUT =5V,I LOAD =500mA to 2A L =32µH,C OUT =220µF,C OUT ESR =50m ΩDS012583-19A:Output Voltage,100mV/div.(AC)B:500mA to 2A Load PulseHorizontal Time Base:100µs/div.Load Transient Response for Discontinuous Mode V IN =20V,V OUT =5V,I LOAD =500mA to 2A L =10µH,C OUT =330µF,C OUT ESR =45m ΩDS012583-20A:Output Voltage,100mV/div.(AC)B:500mA to 2A Load PulseHorizontal Time Base:200µs/div.7Test Circuit and Layout GuidelinesAs in any switching regulator,layout is very important.Rap-idly switching currents associated with wiring inductance can generate voltage transients which can cause problems.For minimal inductance and ground loops,the wires indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible.For best results,ex-ternal components should be located as close to the switcher lC as possible using ground plane construction or single point grounding.If open core inductors are used,special care must be taken as to the location and positioning of this type of induc-tor.Allowing the inductor flux to intersect sensitive feedback,lC groundpath and C OUT wiring can cause problems.When using the adjustable version,special care must be taken as to the location of the feedback resistors and the as-sociated wiring.Physically locate both resistors near the IC,and route the wiring away from the inductor,especially an open core type of inductor.(See application section for more information.)Fixed Output Voltage VersionsDS012583-22C IN —470µF,50V,Aluminum Electrolytic Nichicon “PL Series”C OUT —220µF,25V Aluminum Electrolytic,Nichicon “PL Series”D1—5A,40V Schottky Rectifier,1N5825L1—68µH,L38Adjustable Output Voltage VersionsDS012583-23where V REF =1.23VSelect R 1to be approximately 1k Ω,use a 1%resistor for best stability.C IN —470µF,50V,Aluminum Electrolytic Nichicon “PL Series”C OUT —220µF,35V Aluminum Electrolytic,Nichicon “PL Series”D1—5A,40V Schottky Rectifier,1N5825L1—68µH,L38R1—1k Ω,1%C FF —See Application Information SectionFIGURE 1.Standard Test Circuits and Layout Guides 8LM2596Series Buck Regulator Design Procedure(Fixed Output) PROCEDURE(Fixed Output Voltage Version)EXAMPLE(Fixed Output Voltage Version)Given:V OUT=Regulated Output Voltage(3.3V,5V or12V) V IN(max)=Maximum DC Input VoltageI LOAD(max)=Maximum Load Current Given:V OUT=5VV IN(max)=12V I LOAD(max)=3A1.Inductor Selection(L1)A.Select the correct inductor value selection guide from Fig-ures Figure4,Figure5,or Figure6.(Output voltages of3.3V, 5V,or12V respectively.)For all other voltages,see the de-sign procedure for the adjustable version.B.From the inductor value selection guide,identify the induc-tance region intersected by the Maximum Input Voltage line and the Maximum Load Current line.Each region is identified by an inductance value and an inductor code(LXX).C.Select an appropriate inductor from the four manufactur-er’s part numbers listed in Figure8.1.Inductor Selection(L1)e the inductor selection guide for the5V version shown in Figure5.B.From the inductor value selection guide shown in Figure5, the inductance region intersected by the12V horizontal line and the3A vertical line is33µH,and the inductor code is L40.C.The inductance value required is33µH.From the table in Figure8,go to the L40line and choose an inductor part num-ber from any of the four manufacturers shown.(In most in-stance,both through hole and surface mount inductors are available.)2.Output Capacitor Selection(C OUT)A.In the majority of applications,low ESR(Equivalent Series Resistance)electrolytic capacitors between82µF and 820µF and low ESR solid tantalum capacitors between 10µF and470µF provide the best results.This capacitor should be located close to the IC using short capacitor leads and short copper traces.Do not use capacitors larger than 820µF.For additional information,see section on output capaci-tors in application information section.B.To simplify the capacitor selection procedure,refer to the quick design component selection table shown in Figure2. This table contains different input voltages,output voltages, and load currents,and lists various inductors and output ca-pacitors that will provide the best design solutions.C.The capacitor voltage rating for electrolytic capacitors should be at least1.5times greater than the output voltage, and often much higher voltage ratings are needed to satisfy the low ESR requirements for low output ripple voltage.D.For computer aided design software,see Switchers Made Simple™version4.3or later.2.Output Capacitor Selection(C OUT)A.See section on output capacitors in application infor-mation section.B.From the quick design component selection table shownin Figure2,locate the5V output voltage section.In the loadcurrent column,choose the load current line that is closest tothe current needed in your application,for this example,usethe3A line.In the maximum input voltage column,select theline that covers the input voltage needed in your application,in this example,use the15V line.Continuing on this line arerecommended inductors and capacitors that will provide thebest overall performance.The capacitor list contains both through hole electrolytic andsurface mount tantalum capacitors from four different capaci-tor manufacturers.It is recommended that both the manufac-turers and the manufacturer’s series that are listed in thetable be used.In this example aluminum electrolytic capacitors from severaldifferent manufacturers are available with the range of ESRnumbers needed.330µF35V Panasonic HFQ Series330µF35V Nichicon PL SeriesC.For a5V output,a capacitor voltage rating at least7.5V ormore is needed.But even a low ESR,switching grade,220µF10V aluminum electrolytic capacitor would exhibit ap-proximately225mΩof ESR(see the curve in Figure14forthe ESR vs voltage rating).This amount of ESR would resultin relatively high output ripple voltage.To reduce the ripple to1%of the output voltage,or less,a capacitor with a highervalue or with a higher voltage rating(lower ESR)should beselected.A16V or25V capacitor will reduce the ripple volt-age by approximately half. 9LM2596Series Buck Regulator Design Procedure(Fixed Output)(Continued) PROCEDURE(Fixed Output Voltage Version)EXAMPLE(Fixed Output Voltage Version)3.Catch Diode Selection(D1)A.The catch diode current rating must be at least1.3times greater than the maximum load current.Also,if the power supply design must withstand a continuous output short,the diode should have a current rating equal to the maximum current limit of the LM2596.The most stressful condition for this diode is an overload or shorted output condition.B.The reverse voltage rating of the diode should be at least1.25times the maximum input voltage.C.This diode must be fast(short reverse recovery time)and must be located close to the LM2596using short leads and short printed circuit traces.Because of their fast switching speed and low forward voltage drop,Schottky diodes provide the best performance and efficiency,and should be the first choice,especially in low output voltage applications. Ultra-fast recovery,or High-Efficiency rectifiers also provide good results.Ultra-fast recovery diodes typically have re-verse recovery times of50ns or less.Rectifiers such as the 1N5400series are much too slow and should not be used.3.Catch Diode Selection(D1)A.Refer to the table shown in Figure11.In this example,a 5A,20V,1N5823Schottky diode will provide the best perfor-mance,and will not be overstressed even for a shorted out-put.4.Input Capacitor(C IN)A low ESR aluminum or tantalum bypass capacitor is needed between the input pin and ground pin to prevent large volt-age transients from appearing at the input.This capacitor should be located close to the IC using short leads.In addi-tion,the RMS current rating of the input capacitor should be selected to be at least1⁄2the DC load current.The capacitor manufacturers data sheet must be checked to assure that this current rating is not exceeded.The curve shown in Fig-ure13shows typical RMS current ratings for several different aluminum electrolytic capacitor values.For an aluminum electrolytic,the capacitor voltage rating should be approximately1.5times the maximum input volt-age.Caution must be exercised if solid tantalum capacitors are used(see Application Information on input capacitor). The tantalum capacitor voltage rating should be2times the maximum input voltage and it is recommended that they be surge current tested by the manufacturer.Use caution when using ceramic capacitors for input bypass-ing,because it may cause severe ringing at the V IN pin. For additional information,see section on input capaci-tors in Application Information section.4.Input Capacitor(C IN)The important parameters for the Input capacitor are the in-put voltage rating and the RMS current rating.With a nominal input voltage of12V,an aluminum electrolytic capacitor with a voltage rating greater than18V(1.5x V IN)would be needed.The next higher capacitor voltage rating is25V. The RMS current rating requirement for the input capacitor in a buck regulator is approximately1⁄2the DC load current.In this example,with a3A load,a capacitor with a RMS current rating of at least1.5A is needed.The curves shown in Figure 13can be used to select an appropriate input capacitor. From the curves,locate the35V line and note which capaci-tor values have RMS current ratings greater than1.5A.A 680µF/35V capacitor could be used.For a through hole design,a680µF/35V electrolytic capaci-tor(Panasonic HFQ series or Nichicon PL series or equiva-lent)would be adequate.other types or other manufacturers capacitors can be used provided the RMS ripple current rat-ings are adequate.For surface mount designs,solid tantalum capacitors can be used,but caution must be exercised with regard to the ca-pacitor surge current rating(see Application Information on input capacitors in this data sheet).The TPS series available from AVX,and the593D series from Sprague are both surge current tested.10LM2596Series Buck Regulator Design Procedure(Fixed Output)(Continued)Conditions Inductor Output CapacitorThrough Hole Electrolytic Surface Mount Tantalum Output Load Max Input Inductance Inductor Panasonic Nichicon AVX TPS Sprague Voltage Current Voltage(µH)(#)HFQ Series PL Series Series595D Series (V)(A)(V)(µF/V)(µF/V)(µF/V)(µF/V)3.33522L41470/25560/16330/6.3390/6.3722L41560/35560/35330/6.3390/6.31022L41680/35680/35330/6.3390/6.34033L40560/35470/35330/6.3390/6.3622L33470/25470/35330/6.3390/6.3 21033L32330/35330/35330/6.3390/6.34047L39330/35270/50220/10330/10 53822L41470/25560/16220/10330/101022L41560/25560/25220/10330/101533L40330/35330/35220/10330/104047L39330/35270/35220/10330/10922L33470/25560/16220/10330/10 22068L38180/35180/35100/10270/104068L38180/35180/35100/10270/10 1231522L41470/25470/25100/16180/161833L40330/25330/25100/16180/163068L44180/25180/25100/16120/204068L44180/35180/35100/16120/201533L32330/25330/25100/16180/16 22068L38180/25180/25100/16120/2040150L4282/2582/2568/2068/25 FIGURE2.LM2596Fixed Voltage Quick Design Component Selection Table11LM2596Series Buck Regulator Design Procedure(Adjustable Output) PROCEDURE(Adjustable Output Voltage Version)EXAMPLE(Adjustable Output Voltage Version)Given:V OUT=Regulated Output VoltageV IN(max)=Maximum Input VoltageI LOAD(max)=Maximum Load CurrentF=Switching Frequency(Fixed at a nominal150kHz).Given:V OUT=20VV IN(max)=28VI LOAD(max)=3AF=Switching Frequency(Fixed at a nominal150kHz).1.Programming Output Voltage(Selecting R1and R2,asshown in Figure1)Use the following formula to select the appropriate resistorvalues.Select a value for R1between240Ωand1.5kΩ.The lowerresistor values minimize noise pickup in the sensitive feed-back pin.(For the lowest temperature coefficient and the beststability with time,use1%metal film resistors.)1.Programming Output Voltage(Selecting R1and R2,asshown in Figure1)Select R1to be1kΩ,1%.Solve for R2.R2=1k(16.26−1)=15.26k,closest1%value is15.4kΩ.R2=15.4kΩ.2.Inductor Selection(L1)A.Calculate the inductor Volt•microsecond constant E•T(V•µs),from the following formula:where V SAT=internal switch saturation voltage=1.16Vand V D=diode forward voltage drop=0.5Ve the E•T value from the previous formula and matchit with the E•T number on the vertical axis of the InductorValue Selection Guide shown in Figure7.C.on the horizontal axis,select the maximum load current.D.Identify the inductance region intersected by the E•Tvalue and the Maximum Load Current value.Each region isidentified by an inductance value and an inductor code(LXX).E.Select an appropriate inductor from the four manufactur-er’s part numbers listed in Figure8.2.Inductor Selection(L1)A.Calculate the inductor Volt•microsecond constant(E•T),B.E•T=34.2(V•µs)C.I LOAD(max)=3AD.From the inductor value selection guide shown in Figure7,the inductance region intersected by the34(V•µs)horizon-tal line and the3A vertical line is47µH,and the inductorcode is L39.E.From the table in Figure8,locate line L39,and select aninductor part number from the list of manufacturers part num-bers.12LM2596Series Buck Regulator Design Procedure (Adjustable Output)(Continued)PROCEDURE (Adjustable Output Voltage Version)EXAMPLE (Adjustable Output Voltage Version)3.Output Capacitor Selection (C OUT )A.In the majority of applications,low ESR electrolytic or solid tantalum capacitors between 82µF and 820µF provide the best results.This capacitor should be located close to the IC using short capacitor leads and short copper traces.Do not use capacitors larger than 820µF.For additional informa-tion,see section on output capacitors in application in-formation section.B.To simplify the capacitor selection procedure,refer to the quick design table shown in Figure 3.This table contains dif-ferent output voltages,and lists various output capacitors that will provide the best design solutions.C.The capacitor voltage rating should be at least 1.5times greater than the output voltage,and often much higher volt-age ratings are needed to satisfy the low ESR requirements needed for low output ripple voltage.3.Output Capacitor SeIection (C OUT )A.See section on C OUT in Application Information section.B.From the quick design table shown in Figure 3,locate the output voltage column.From that column,locate the output voltage closest to the output voltage in your application.In this example,select the 24V line.Under the output capacitor section,select a capacitor from the list of through hole elec-trolytic or surface mount tantalum types from four different capacitor manufacturers.It is recommended that both the manufacturers and the manufacturers series that are listed in the table be used.In this example,through hole aluminum electrolytic capaci-tors from several different manufacturers are available.220µF/35V Panasonic HFQ Series 150µF/35V Nichicon PL SeriesC.For a 20V output,a capacitor rating of at least 30V or more is needed.In this example,either a 35V or 50V capaci-tor would work.A 35V rating was chosen,although a 50V rat-ing could also be used if a lower output ripple voltage is needed.Other manufacturers or other types of capacitors may also be used,provided the capacitor specifications (especially the 100kHz ESR)closely match the types listed in the table.Re-fer to the capacitor manufacturers data sheet for this informa-tion.4.Feedforward Capacitor (C FF )(See Figure 1)For output voltages greater than approximately 10V,an addi-tional capacitor is required.The compensation capacitor is typically between 100pF and 33nF,and is wired in parallel with the output voltage setting resistor,R 2.It provides addi-tional stability for high output voltages,low input-output volt-ages,and/or very low ESR output capacitors,such as solid tantalum capacitors.This capacitor type can be ceramic,plastic,silver mica,etc.(Because of the unstable characteristics of ceramic capaci-tors made with Z5U material,they are not recommended.)4.Feedforward Capacitor (C FF )The table shown in Figure 3contains feed forward capacitor values for various output voltages.In this example,a 560pF capacitor is needed.13。

LM2596TADJG中文资料

LM2596Product Preview3.0 A, Step-Down Switching RegulatorThe LM2596 regulator is monolithic integrated circuit ideally suited for easy and convenient design of a step−down switching regulator (buck converter). It is capable of driving a 3.0 A load with excellent line and load regulation. This device is available in adjustable output version and it is internally compensated to minimize the number of external components to simplify the power supply design.Since LM2596 converter is a switch−mode power supply, its efficiency is significantly higher in comparison with popular three−terminal linear regulators, especially with higher input voltages. The LM2596 operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5−lead TO−220 package with several different lead bend options, and D2PAK surface mount package.The other features include a guaranteed $4% tolerance on output voltage within specified input voltages and output load conditions, and $15% on the oscillator frequency. External shutdown is included, featuring 80 m A (typical) standby current. Self protection features include switch cycle−by−cycle current limit for the output switch, as well as thermal shutdown for complete protection under fault conditions.Features•Adjustable Output Versions 1.23 V − 37 V •Guaranteed 3.0 A Output Load Current•Wide Input V oltage Range up to 40 V•150 kHz Fixed Frequency Internal Oscillator•TTL Shutdown Capability•Low Power Standby Mode, typ 80 m A•Thermal Shutdown and Current Limit Protection •Internal Loop Compensation•Moisture Sensitivity Level (MSL) Equals 1•Pb−Free Packages are AvailableApplications•Simple High−Efficiency Step−Down (Buck) Regulator •Efficient Pre−Regulator for Linear Regulators•On−Card Switching Regulators•Positive to Negative Converter (Buck−Boost)•Negative Step−Up Converters•Power Supply for Battery ChargersThis document contains information on a product under development. ON Semiconductor reserves the right to change or discontinue this product without notice.See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet.ORDERING INFORMATIONTO−220TV SUFFIXCASE 314BHeatsink surface connected to Pin 3TO−220T SUFFIXCASE 314DPin 1.V in2.Output3.Ground4.Feedback5.ON/OFFD2PAKD2T SUFFIXCASE 936A Heatsink surface (shown as terminal 6 incase outline drawing) is connected to Pin 35See general marking information in the device marking section on page 11 of this data sheet.DEVICE MARKING INFORMATIONFigure 1. Block Diagram and Typical Application8.0 V - 40 V Unregulated DC InputTypical Application (Adjustable Output Voltage Versions)Representative Block Diagram and Typical ApplicationMAXIMUM RATINGSRatingSymbol Value Unit Maximum Supply Voltage V in 45V ON/OFF Pin Input Voltage−−0.3 V ≤ V ≤ +V inV Output Voltage to Ground (Steady −State)−−1.0VPower DissipationCase 314B and 314D (TO −220, 5−Lead)P D Internally LimitedW Thermal Resistance, Junction −to −Ambient R q JA 65°C/W Thermal Resistance, Junction −to −Case R q JC 5.0°C/W Case 936A (D 2PAK)P D Internally LimitedW Thermal Resistance, Junction −to −Ambient R q JA 70°C/W Thermal Resistance, Junction −to −Case R q JC 5.0°C/W Storage Temperature RangeT stg −65 to +150°C Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 k W )− 2.0kV Lead Temperature (Soldering, 10 seconds)−260°C Maximum Junction TemperatureT J150°CStresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.PIN FUNCTION DESCRIPTIONPin Symbol Description (Refer to Figure 1)1V in This pin is the positive input supply for the LM2596 step−down switching regulator. In order to minimize voltage tran-sients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must bepresent (C in in Figure 1).2Output This is the emitter of the internal switch. The saturation voltage V sat of this output switch is typically 1.5 V. It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling tosensitive circuitry.3GND Circuit ground pin. See the information about the printed circuit board layout.4Feedback This pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to allow pro-gramming of the output voltage.5ON/OFF It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply current to approximately 80 m A. The threshold voltage is typically 1.4 V. Applying a voltage above this value (up to+V in) shuts the regulator off. If the voltage applied to this pin is lower than 1.4 V or if this pin is left open, the regulatorwill be in the “on” condition.OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.)Rating Symbol Value Unit Operating Junction Temperature Range T J−40 to +125°C Supply Voltage V in 4.5 to 40VSYSTEM PARAMETERSELECTRICAL CHARACTERISTICS Specifications with standard type face are for T J = 25°C, and those with boldface type apply over full Operating Temperature Range −40°C to +125°CCharacteristics Symbol Min Typ Max Unit LM2596 (Note 1, Test Circuit Figure )Feedback Voltage (V in= 12 V, I Load = 0.5 A, V out = 5.0 V, )V FB 1.217 1.23 1.243VFeedback Voltage (8.0 V ≤ V in≤ 40 V, 0.5 A ≤ I Load≤ 3.0 A, V out = 5.0 V)V FB 1.1931.181.2671.28VEfficiency (V in= 12 V, I Load = 3.0 A, V out = 5.0 V)η−73−% Characteristics Symbol Min Typ Max Unit Feedback Bias Current (V out = 5.0 V)I b25100200nAOscillator Frequency( Note 2)f osc135120150165180kHzSaturation Voltage (I out = 3.0 A, Notes 3 and 4)V sat 1.5 1.82.0V Max Duty Cycle (ON) Note 4DC95%Current Limit (Peak Current Notes 2 and 3)I CL 4.23.55.6 6.97.5AOutput Leakage Current (Notes 5 and 6) Output = 0 VOutput = −1.0 V I L0.56.02.020mAQuiescent Current (Note 5)I Q 5.010mAStandby Quiescent Current (ON/OFF Pin = 5.0 V (“off”)) (Note 6)I stby50200250m AON/OFF PIN LOGIC INPUTThreshold Voltage 1.6VV out = 0 V (Regulator OFF)V IH 2.22.4VV out = Nominal Output Voltage (Regulator ON)V IL 1.00.8V ON/OFF Pin Input CurrentON/OFF Pin = 5.0 V (Regulator OFF)I IH−1530m A ON/OFF Pin = 0 V (regulator ON)I IL−0.01 5.0m A 1.External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.When the LM2596 is used as shown in the Figure 15test circuit, system performance will be as shown in system parameters section.2.The oscillator frequency reduces to approximately 30 kHz in the event of an output short or an overload which causes the regulated outputvoltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.3.No diode, inductor or capacitor connected to output pin.4.Feedback (Pin 4) removed from output and connected to 0 V.5.Feedback (Pin 4) removed from output and connected to +12 V to force the output transistor “off”.6.V in = 40 V.I Q , Q U I E S C E N T C U R R E N T (m A )V o u t , O U T P U T V O L T A G E C H A N G E (%)V o u t , O U T P U T V O L T A G E C H A N G E (%), S T A N D B Y Q U I E S C E N T C U R R E N T (T J , JUNCTION TEMPERATURE (°C)I O , O U T P U T C U R R E N T (A )T J , JUNCTION TEMPERATURE (°C)V in , INPUT VOLTAGE (V)V in , INPUT VOLTAGE (V)I N P U T - O U T P U T D I F F E R E N T I A L (V )T J , JUNCTION TEMPERATURE (°C)Figure 2. Normalized Output Voltage T J , JUNCTION TEMPERATURE (°C)Figure 3. Line RegulationFigure 4. Dropout Voltage Figure 5. Current LimitFigure 6. Quiescent Current Figure 7. Standby Quiescent CurrentμA )1.00.60.20-0.2-0.4-1.0 1.41.21.00.80.60.40.20-0.2-0.4-0.66.56.05.55.04.54.02018161412108.06.04.0-0.8-0.60.40.8I s t b yV s a t , S A T U R A T I O N V O L T A G E (V )2.02.53.04.0I b , F E E D B A C K P I N C U R R E N T (n A ), S T A N D B Y Q U I E S C E N T C U R R E N T (μA )I s t b y , I N P U T V O L T A G E (V )T J , JUNCTION TEMPERATURE (°C)SWITCH CURRENT (A)N O R M A L I Z E D F R E Q U E N C Y (%)T J , JUNCTION TEMPERATURE (°C)Figure 8. Standby Quiescent Current V in , INPUT VOLTAGE (V)Figure 9. Switch Saturation VoltageFigure 10. Oscillator FrequencyFigure 11. Minimum Operating VoltageFigure 12. Feedback Pin Current2001801401201008060402001.61.41.21.00.80.60.40.205.04.53.51.51.00.50-50T J , JUNCTION TEMPERATURE (°C)100806040200-20-40-60-80-100125100755025-25-50160V i n −9.0−8.0−7.0−6.0−5.0−4.0−3.0−2.0−1.00.01.0−2.0 A 00ABC 100 m s/DIV2 m s/DIVFigure 13. Switching WaveformsFigure 14. Load Transient ResponseVout = 15 VA: Output Pin Voltage, 10 V/DIV B: Inductor Current, 2.0 A/DIVC: Inductor Current, 2.0 A/DIV, AC −CoupledD: Output Ripple Voltage, 50 mV/dDIV, AC −Coupled Horizontal Time Base: 5.0 m s/DIV50 V 04.0 A 2.0 A 100 mV OutputVoltageChange03.0 A2.0 A 1.0 A4.0 A - 100 mVLoad CurrentDFigure 15. Typical Test CircuitAdjustable Output Voltage Versionsout ref R2R1ǓR2+R1ǒV out V ref 1.0ǓWhere V ref = 1.23 V, R1 between 1.0 k and 5.0 kPCB LAYOUT GUIDELINESAs in any switching regulator, the layout of the printed circuit board is very important. Rapidly switching currents associated with wiring inductance, stray capacitance and parasitic inductance of the printed circuit board traces can generate voltage transients which can generate electromagnetic interferences (EMI) and affect the desired operation. As indicated in the Figure 15, to minimize inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible.For best results, single −point grounding (as indicated) or ground plane construction should be used.On the other hand, the PCB area connected to the Pin 2(emitter of the internal switch) of the LM2596 should be kept to a minimum in order to minimize coupling to sensitive circuitry.Another sensitive part of the circuit is the feedback. It is important to keep the sensitive feedback wiring short. To assure this, physically locate the programming resistors near to the regulator, when using the adjustable version of the LM2596 regulator.DESIGN PROCEDUREBuck Converter BasicsThe LM2596 is a “Buck” or Step −Down Converter which is the most elementary forward −mode converter. Its basic schematic can be seen in Figure 16.The operation of this regulator topology has two distinct time periods. The first one occurs when the series switch is on, the input voltage is connected to the input of the inductor.The output of the inductor is the output voltage, and the rectifier (or catch diode) is reverse biased. During this period, since there is a constant voltage source connected across the inductor, the inductor current begins to linearly ramp upwards, as described by the following equation:I L(on)+ǒV IN *V OUT Ǔt onLDuring this “on” period, energy is stored within the core material in the form of magnetic flux. If the inductor is properly designed, there is sufficient energy stored to carry the requirements of the load during the “off” period.Figure 16. Basic Buck ConverterR LoadPower The next period is the “off” period of the power switch.When the power switch turns off, the voltage across the inductor reverses its polarity and is clamped at one diode voltage drop below ground by the catch diode. The current now flows through the catch diode thus maintaining the load current loop. This removes the stored energy from the inductor. The inductor current during this time is:I L(off)+ǒV OUT *V D Ǔt offLThis period ends when the power switch is once again turned on. Regulation of the converter is accomplished by varying the duty cycle of the power switch. It is possible to describe the duty cycle as follows:d +ton T, where T is the period of switching.For the buck converter with ideal components, the duty cycle can also be described as:d +V outV inFigure 17 shows the buck converter, idealized waveforms of the catch diode voltage and the inductor current.Figure 17. Buck Converter Idealized WaveformsPROCEDURE (ADJUSTABLE OUTPUT VERSION:LM2596)PROCEDURE (ADJUSTABLE OUTPUT VERSION:LM2596) (CONTINUED)ORDERING INFORMATIONDevicePackage Shipping †LM2596TADJG TO −220(Pb −Free)50 Units / Rail LM2596TVADJG TO −220 (F)(Pb −Free)50 Units / Rail LM2596DSADJG D 2PAK (Pb −Free)50 Units / Rail LM2596DSADJR4GD 2PAK (Pb −Free)2500 / Tape & Reel†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.A = Assembly Location WL = Wafer Lot Y = YearWW = Work WeekG= Pb −Free PackageTO −220TV SUFFIX CASE 314B1MARKING DIAGRAMS5TO −220T SUFFIX CASE 314DD 2PAK D2T SUFFIX CASE 936ALM2596T −ADJ AWLYWWGLM2596T −ADJ AWLYWWGLM2596D2T −ADJ AWLYWWG1515LM2596−ADJ AWLYWWG 15TO −220TV SUFFIX CASE 314B −05ISSUE LM0.10 (0.254)PMT NOTES:1.DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.2.CONTROLLING DIMENSION: INCH.3.DIMENSION D DOES NOT INCLUDEINTERCONNECT BAR (DAMBAR) PROTRUSION.DIMENSION D INCLUDING PROTRUSION SHALL NOT EXCEED 0.043 (1.092) MAXIMUM.DIM MIN MAX MIN MAX MILLIMETERSINCHES A 0.5720.61314.52915.570B 0.3900.4159.90610.541C 0.1700.180 4.318 4.572D 0.0250.0380.6350.965E 0.0480.055 1.219 1.397F 0.8500.93521.59023.749G 0.067 BSC 1.702 BSC H 0.166 BSC 4.216 BSC J 0.0150.0250.3810.635K 0.900 1.10022.86027.940L 0.3200.3658.1289.271N 0.320 BSC 8.128 BSC Q 0.1400.153 3.556 3.886S ---0.620---15.748U 0.4680.50511.88812.827V ---0.735---18.669W0.0900.1102.286 2.794TO −220T SUFFIX CASE 314D −04ISSUE FMQM0.356 (0.014)T SEATING PLANEDIM MIN MAX MIN MAX MILLIMETERSINCHES A 0.5720.61314.52915.570B 0.3900.4159.90610.541C 0.1700.180 4.318 4.572D 0.0250.0380.6350.965E 0.0480.055 1.219 1.397G 0.067 BSC 1.702 BSC H 0.0870.112 2.210 2.845J 0.0150.0250.3810.635K 0.977 1.04524.81026.543L 0.3200.3658.1289.271Q 0.1400.153 3.556 3.886U0.1050.1172.667 2.972NOTES:1.DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.2.CONTROLLING DIMENSION: INCH.3.DIMENSION D DOES NOT INCLUDEINTERCONNECT BAR (DAMBAR) PROTRUSION.DIMENSION D INCLUDING PROTRUSION SHALL NOT EXCEED 10.92 (0.043) MAXIMUM.B10.3750.4159.52510.541DETAIL A −AD 2PAK D2T SUFFIX CASE 936A −02ISSUE C5 REF NOTES:1.DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.2.CONTROLLING DIMENSION: INCH.3.TAB CONTOUR OPTIONAL WITHIN DIMENSIONS A AND K.4.DIMENSIONS U AND V ESTABLISH A MINIMUM MOUNTING SURFACE FOR TERMINAL 6.5.DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH OR GATE PROTRUSIONS. MOLD FLASH AND GATE PROTRUSIONS NOT TO EXCEED 0.025(0.635) MAXIMUM.DIM A MIN MAX MIN MAX MILLIMETERS 0.3860.4039.80410.236INCHES B 0.3560.3689.0429.347C 0.1700.180 4.318 4.572D 0.0260.0360.6600.914E 0.0450.055 1.143 1.397G 0.067 BSC 1.702 BSC H 0.5390.57913.69114.707K 0.050 REF 1.270 REF L 0.0000.0100.0000.254M 0.0880.102 2.235 2.591N 0.0180.0260.4570.660P 0.0580.0781.473 1.981R 5 REF S 0.116 REF 2.946 REF U 0.200 MIN 5.080 MIN V0.250 MIN6.350 MIN__SCALE 3:1ǒmm inchesǓ*For additional information on our Pb −Free strategy and solderingdetails, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur.Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries,affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.PUBLICATION ORDERING INFORMATION。

lm2596中文资料

lm2596中文资料1. 概述lm2596是一款高效率开关电源稳压器芯片，广泛应用于电子设备中对直流电压进行稳定调整的场合。

本文档将详细介绍lm2596的特性、工作原理、应用场景以及使用注意事项。

2. 特性•宽输入电压范围：4V-40V•可调输出电压范围：1.23V-37V•高效率：可达到92%•最大输出电流：3A•过热保护功能3. 工作原理lm2596采用了开关稳压器的工作原理，通过周期性地开关和断开电流流通路径，将输入电压转换为稳定的输出电压。

其主要原理如下：1.输入电压通过电感和开关管传导到输出端，同时电容储存能量。

2.控制器检测输出电压，如果低于设定值，则控制开关管开启，使电流通过电感传输到输出端，提供稳定的输出电压。

3.如果输出电压高于设定值，则控制开关管关闭，切断电流流动。

这种周期性的开关和断开电路，可以通过控制开关管的开启时间和关闭时间，来调整输出电压的稳定性和精确度。

4. 应用场景lm2596广泛应用于各种需要稳定直流电压的场合，以下是lm2596常见的应用场景：4.1 电子设备稳压电源lm2596可以根据需要调整输出电压，可以在电子设备中作为稳压电源芯片使用。

它可以将输入电压调整为稳定的输出电压，以供电子设备正常运行。

4.2 LED照明由于lm2596具有高效率和可调输出电压的特性，非常适合用于LED照明应用。

lm2596可以将输入电压调整为适合LED灯的电压，提供稳定的电源以驱动LED照明。

4.3 高频电源lm2596的高效率和宽输入电压范围，使其非常适合用于高频电源应用。

lm2596可以将输入电压转换为稳定的高频输出，满足高频电源的需求。

5. 使用注意事项在使用lm2596时，请注意以下事项：1.输入电压不要超过40V，否则可能导致芯片过载损坏。

2.充分考虑散热问题，尽量避免芯片过热，建议在芯片周围预留散热空间。

3.在使用lm2596时，应按照芯片的使用说明进行正确的电路设计和连接。

lm2596中文资料_数据手册_参数

·Regulatorsfrequency卡片上的切换。包括外部关闭,·正到负Convertertypically 80μa 待机电流。自我保护特性包括输出开关的两级频率减少电流限制和完全保护故障状态下的过热关闭。(1)(1)__专利号5382918。典型应用(固定输出电压版本)请注意，关于lm2596德州仪器半导体产品和免责lm2596声明的可用性、标准保证和关键应用的一个重要通知出现在本数据表的末尾。简单切换器是德州仪器的注册商标。所有其他商标都是其各自所有者的财产。生产数据信息是当前出版日期。版权©1999 - 2013 年,德州仪器IncorporatedProducts符合规格/ TexasInstruments标准保修条款。生产加工不连接DiagramsFigure 1。5根引线弯曲交错，如图2所示。5-Lead DDPAK/TO-263 (S) PackageThrough Hole TO-220 (T) PackageSee Package Number KTT0005BSee Package Number NDH0005DThese devices have limited内置ESD protection。在储存或处理过程中，应将引线短接在一起，或将设备置于导电泡沫中，以防止对MOS门的静电损坏。绝对最大额定参数(1)(2)最大供应Voltage45VON /关销输入电压 0.3 V≤≤+ 25 vfeedback销电压0.3 V≤≤25 + voutput对地电压(稳态) 1 vpower DissipationInternally limitedStorage温度范围 65°C + 150°CESD SusceptibilityHuman身体模型(3)2 kVLead TemperatureDDPAK / - 263 PackageVapor阶段(60秒。)+ 215°CInfrared(10秒)+ 245° 首席技术官- 220包(焊接,10秒)+ 260°CMaximum结温+ 150°C(1)绝对最大额定参数表明超过这个限制可能发生损坏设备。操作额定值指示设备功能的条件，但不保证特定的性能限制。(2)如果需lm2596要军用/航空航天专用设备，请与德州仪器销售办公室/分销商联系，了解其可用性和规格。操作ConditionsTemperature范围 40° C≤TJ≤+ 125°CSupply Voltage4.5V 40 v2submit文档FeedbackCopyright©1999 - 2013年, 德州仪器IncorporatedProduct文件夹链接:LM259图2显示了计时器2自动计数 whenDCEN = 0。在此模式下，bitEXEN2在T2CON中选择两个选项。如果EXEN2 = 0，计时器2计数到0ffh，然后在溢出时设置TF2位。溢出还会导致计时器寄存器被重新加载，其中包含RCAP2H和RCAP2L中的16位值。捕获ModeRCAP2H和RCAP2L中的inTimer的值是由软件预先设lm2596定的。如果EXEN2 = 1，那么16位的重载可以通过溢出或在externalinput T2EX中通过1到0的转换触发。这个转换还设置了EXF2 位。tf2和EXF2位都可以在启用时生成中断。设置DCEN位使定时器2可以向上或向下计数，如图3所示。在这种模式下，T2EX pin控制了计数的方向。T2EX的逻辑1使计时器2计数。计时器将在0ffh溢出并设置tf2位。这种溢出还会导致16位值inRCAP2H 和RCAP2L分别被重新加载lm2596到计时器寄存器TH2和TL2中。T2EX的逻辑0使定时器2倒数。当TH2和TL2等于存储在inRCAP2H和RCAP2L中的值时，timerunderflows。下流设置TF2位并将0ffh重新加载到计时器寄存器中。EXF2位可在计时器2溢出或溢出时切换，可lm2596以用作第17位的分辨率。在此操作模式中，EXF2不标记中断

LM2596R-5.0中文资料

元器件交易网3.0A, 150Khz, Step-Down Switching RegulatorFEATURES3.3V, 5.0V, 12V, 15V, and Adjustable Output Versions Adjustable Version Output Voltage Range, 1.23 to 37V +/- 4%. Maximum Over Line and Load Conditions Guaranteed 3.0A Output Current Wide Input Voltage Range Requires Only 4 External Components 150Khz Fixed Frequency Internal Oscillator TTL Shutdown Capability, Low Power Standby Mode High Efficiency Uses Readily Available Standard Inductors Thermal Shutdown and Current Limit Protection Moisture Sensitivity Level(MSL) Equals1 TO-263(D2) TO-220V TO-220LM2596ApplicationsSimple High-Efficiency Step-Down(Buck) Regulator Efficient Pre-Regulator for Linear Regulators On-Card Switching Regulators Positive to Negative Converter(Buck-Boost) Negative Step-Up Converters Power Supply for Battery Chargers1. 2. 3. 4. 5. Vin Output Ground Feedback On/OffDESCRIPTIONThe LM2596 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regualtor(buck converter). All circuits of this series are capable of driving a 3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V,12V, 15V, and an adjustable output version.ORDERING INFORMATIONDevice LM2596T-X.X LM2596TV-X.X LM2596R Marking LM2596T-X.X LM2596T-X.X LM2596R-X.X Package TO-220 TO-220V TO-263These regulatiors were designed to minimize the number of externalcomponents to simplify the power supply design. Standard series of inductors optimized for use with the LM2576 are offered by several different inductor manufacturers. Since the LM2596 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal limear reguators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2596 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. The LM2596 features include a guaranteed +/- 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-15% on the oscillator frequency (+/- 2% over 0oC to 125 oC). External shutdown is included, featuring 80 uA(typical) standby current. The output switch includes cycle-bycycle current limiting, as well as thermal shutdown for full protection under fault conditions.HTC1Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTypical Application (Fixed Output Voltage Versions)LM2596LM2596-5.033 uH680 uF1N5824220 uFFigure 1. Block Diagram and Typical ApplicationABSOLUTE MAXIMUM RATINGS(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)Power DissipationTO-220, 5-LeadThermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-caseTO-263Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-caseHTC2Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to befunctional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.)ELECTRICAL CHARACTERISTICS / SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 2) (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.)LM2596-3.3 ([ Note 1]. Test Circuit Figure 2 )73 LM2596-5.0 ([ Note 1]. Test Circuit Figure 2 ) 180 LM2596-12 ([ Note 1]. Test Circuit Figure 2 )90 LM2596-15 ([ Note 1]. Test Circuit Figure 2 )98 LM2596-ADJ ([ Note 1]. Test Circuit Figure 2 )73HTC3Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorELECTRICAL CHARACTERISTICS / Device ParametersLM2596(Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values Tj = 25°C, for min/max values Tj is the operating junction temperature range that applies [Note 2], unless otherwise noted.)10 0 127 110 15050 100 173 1731.16 01.4 1.53.6 3.4100 4.5 6.9 7.5 50 30 1002 5 00 2 0 2.0 2.0 2 V LOGIC = 2.5V (Regulator OFF) V LOGIC = 0.5V (Regulator ON) 5 0.02 1.3 1.32500.6 0.6 15 5.001. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2596 is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section . 2. Tested junction temperature range for the LM2596 : TLOW = –0°C THIGH = +125°C 3. The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. 4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin. 5. Feedback (Pin 4) removed from output and connected to 0 V. 6. Feedback (Pin 4) removed from output and connected to +12 V for the Adjustable, 3.3 V, and 5.0V ersions, and +25 V for the 12 V and15 V versions, to force the output transistor “off”. 7. Vin = 40 V.HTC4Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2)LM2596HTC5Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2)Feedback Pin Bias CurrentLM2596HTC6Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTest Circuit and Layout GuidelinesLM2596Figure 2. Typical Test Circuits and Layout GuideAs in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible. For best results, external components should be located as close to the switcher lC as possible using ground plane construction or single point grounding. If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor. Allowing the inductor flux to intersect sensitive feedback, lC groundpath and COUT wiring can cause problems. When using the adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor.HTC7Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PIN FUNCTION DESCRIPTION Symbol 1VinDescription This pin is the positive input supply for the LM2596 step–down switching23 45regulator.In order to minimize voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present .(Cin in Figure 1). Output This is the emitter of the internal switch. The saturation voltage Vsat of this output switch is typically 1.5 V. It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling to sensitive circuitry. Circuit ground pin. See the information about the printed circuit board layout. Gnd Feedback This pin senses regulated output voltage to complete the feedback loop. The signal is divided by the internal resistor divider network R2, R1 and applied to the non–inverting input of the internal error amplifier. In the Adjustable version of the LM2596 switching regulator this pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to allow programming of the output voltage. ON/OFF It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply current to approximately 80 mA. The threshold voltage is typically 1.4 V. Applying a voltage above this value (up to +Vin) shuts the regulator off. If the voltage applied to this pin is lower than 1.4V or if this pin is left open, the regulator will be in the "on" conditionHTC8Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PACKAGES DIMENSION : TO220-5LHTC9Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorPACKAGES DIMENSION : TO220V-5LLM2596HTC10Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PACKAGES DIMENSION : TO263-5LHTC11Oct 2004 - Rev 0。

中文资料 LM2596电源降压调整器

LM2596电源降压调整器（150KHz，3A）英文文章名：LM2596 SIMPLE SWITCHER® Power Converter 150 kHz3A Step-Down Voltage Regulator文章出处：版本号：DS012583 日期：2002年5月摘录人：黄明强摘录日期：2007年5月3日是否好买估计：生产中心正在使用价格：概述：LM2596系列开关电压调节器是降压型电源管理单片集成电路，能够输出3A的驱动电流，同时具有很好的线性和负载调节特性。

固定输出版本有3.3V、5V、12V，还有一个输出可调版本。

添加少量的外部元件就可以使用该电压调节器。

该器件内部集成有频率补偿和固定频率发生器。

开关频率为150KHz，与低频开关调节器相比较，可以使用更小规格的滤波元件。

其封装形式包括标准的5脚TO-220封装和5脚TO-263表贴封装。

由于该器件可以使用通用的标准电感，这更优化了LM2596的使用，极大地简化了开关电源电路的设计。

该器件还有其他一些特点：在特定的输入电压和输出负载的条件下，输出电压的误差可以保证在±4%的范围内，振荡频率误差在±15%的范围内；可以用仅80μA的待机电流，实现外部断电；具有自我保护电路（一个两级降频限流保护和一个在异常情况下断电的过温完全保护电路）。

特征：※ 3.3V、5V、12V的固定电压输出和可调电压输出※可调输出电压范围1.2V～37V，±4%※封装形式：TO-220（T）和TO-263（S）※保证输出负载电流3A※输入电压可高达40V※仅需4个外接元件※很好的线性和负载调节特性※150KHz固定频率的内部振荡器※TTL关断能力※低功耗待机模式，I Q的典型值为80μA※高转换效率※使用容易购买的标准电感※具有过热保护和限流保护功能应用：※简易高效率降压调节器※在卡上的开关电压调节器※正到负电压转换器专利号：5382918典型电路（固定输出电压版本）：封装和型号：※弯曲交叉的引脚，通孔封装，5脚TO-220 (T)订货型号：LM2596T-3.3, LM2596T-5.0,LM2596T-12 or LM2596T-ADJ ※表面贴封装，5脚TO-263 (S)订货型号：LM2596S-3.3, LM2596S-5.0, LM2596S-12 or LM2596S-ADJ 极限条件：最大供电电压45VON /OFF 管脚输入电压-0.3≤V≤+25V反馈脚电压-0.3≤V≤+25V输出电压到地（稳态）-1V功率消耗内部限定储存温度-65°C 到+150°CESD易感性（人体模式）2KV焊接温度T封装(锡焊, 10秒) +260°C最大结温+150°C运行条件：温度范围－40°C≤T J≤+125°C供电电压 4.5V 到40VLM2596-3.3电参数说明：标准字体对应的项目适合于TJ=25℃时，粗体字对应的项目适合于全温度范围LM2596-5.0电参数说明：标准字体对应的项目适合于TJ=25℃时，粗体字对应的项目适合于全温度范围LM2596-12电参数所有输出电压版本电参数说明：标准字体对应的项目适合于TJ=25℃时，带下划线的粗斜体字对应的项目适合于整个温度范围。

2016新编LM2596芯片简介

编辑本段LM2596芯片简介LM2596系列是美国国家半导体公司生产的3A电流输出降压开关型集成稳压芯片，它内含固定频率振荡器（150KHZ），和基准稳压器（1.23v），并具有完善的保护电路：电流限制、热关断电路等。

利用该器件只需极少的外围器件便可构成高效稳压电路。

提供有：3.3V、5V、12V及可调（-ADJ）等多个电压档次产品。

此外，该芯片还提供了工作状态的外部控制引脚。

LM2596芯片LM2596系列开关稳压集成电路的主要特性如下：1、最大输出电流：3A2、最高输入电压：40V3、输出电压：3.3V、5V、12V及（ADJ）等，最大输出电压37V4、震荡频率：150KHZ5、转换效率：75%~88%（不同电压输出时的转换效率不同）6、工作温度范围：-40℃~+125℃7、工作模式：低功耗/正常两种模式。

可外部控制8、工作模式控制：TTL电平相容9、所需外部组件：仅四个（不可调）；六个（可调）10、器件保护：热关断及电流限制11、封装形式：5脚（TO-220(T)；TO-263(S))编辑本段LM2596内部框图LM2596芯片内部框图。

注：此图为TO-220封装形式的内部框图。

LM2596内部包含150KHZ振荡器、1.23v基准稳压电路、热关断电路、电流限制电路、放大器、比较器和内部[1]稳压电路等。

为了产生不同的输出电压通常将比较器的负端接基准电压（1.23V ），正端接分压电阻网络。

其中R1=1KΩ，R2分别为1.7KΩ（3.3v），3.1KΩ（5V），8.8KΩ（12V）、0（-ADJ）。

将输出电压的分压电阻网络的输出同内部基准稳压值1.23V进行比较，若电压有偏差，则可用放大器控制内部振荡器的输出占空比，从而使输出电压保持稳定。

编辑本段LM2596经典应用实例具体应用时可根据需要选择：LM2596-5V、LM2596-3.3等。

要获得+1.8V、+5V输出电压时请选用A图，要获得+3.3V输出电压时请选用B图。

LM2596T-15中文资料

元器件交易网3.0A, 150Khz, Step-Down Switching RegulatorFEATURES3.3V, 5.0V, 12V, 15V, and Adjustable Output Versions Adjustable Version Output Voltage Range, 1.23 to 37V +/- 4%. Maximum Over Line and Load Conditions Guaranteed 3.0A Output Current Wide Input Voltage Range Requires Only 4 External Components 150Khz Fixed Frequency Internal Oscillator TTL Shutdown Capability, Low Power Standby Mode High Efficiency Uses Readily Available Standard Inductors Thermal Shutdown and Current Limit Protection Moisture Sensitivity Level(MSL) Equals1 TO-263(D2) TO-220V TO-220LM2596ApplicationsSimple High-Efficiency Step-Down(Buck) Regulator Efficient Pre-Regulator for Linear Regulators On-Card Switching Regulators Positive to Negative Converter(Buck-Boost) Negative Step-Up Converters Power Supply for Battery Chargers1. 2. 3. 4. 5. Vin Output Ground Feedback On/OffDESCRIPTIONThe LM2596 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regualtor(buck converter). All circuits of this series are capable of driving a 3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V,12V, 15V, and an adjustable output version.ORDERING INFORMATIONDevice LM2596T-X.X LM2596TV-X.X LM2596R Marking LM2596T-X.X LM2596T-X.X LM2596R-X.X Package TO-220 TO-220V TO-263These regulatiors were designed to minimize the number of externalcomponents to simplify the power supply design. Standard series of inductors optimized for use with the LM2576 are offered by several different inductor manufacturers. Since the LM2596 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal limear reguators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2596 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. The LM2596 features include a guaranteed +/- 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-15% on the oscillator frequency (+/- 2% over 0oC to 125 oC). External shutdown is included, featuring 80 uA(typical) standby current. The output switch includes cycle-bycycle current limiting, as well as thermal shutdown for full protection under fault conditions.HTC1Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTypical Application (Fixed Output Voltage Versions)LM2596LM2596-5.033 uH680 uF1N5824220 uFFigure 1. Block Diagram and Typical ApplicationABSOLUTE MAXIMUM RATINGS(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)Power DissipationTO-220, 5-LeadThermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-caseTO-263Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-caseHTC2Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to befunctional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.)ELECTRICAL CHARACTERISTICS / SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 2) (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.)LM2596-3.3 ([ Note 1]. Test Circuit Figure 2 )73 LM2596-5.0 ([ Note 1]. Test Circuit Figure 2 ) 180 LM2596-12 ([ Note 1]. Test Circuit Figure 2 )90 LM2596-15 ([ Note 1]. Test Circuit Figure 2 )98 LM2596-ADJ ([ Note 1]. Test Circuit Figure 2 )73HTC3Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorELECTRICAL CHARACTERISTICS / Device ParametersLM2596(Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values Tj = 25°C, for min/max values Tj is the operating junction temperature range that applies [Note 2], unless otherwise noted.)10 0 127 110 15050 100 173 1731.16 01.4 1.53.6 3.4100 4.5 6.9 7.5 50 30 1002 5 00 2 0 2.0 2.0 2 V LOGIC = 2.5V (Regulator OFF) V LOGIC = 0.5V (Regulator ON) 5 0.02 1.3 1.32500.6 0.6 15 5.001. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2596 is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section . 2. Tested junction temperature range for the LM2596 : TLOW = –0°C THIGH = +125°C 3. The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. 4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin. 5. Feedback (Pin 4) removed from output and connected to 0 V. 6. Feedback (Pin 4) removed from output and connected to +12 V for the Adjustable, 3.3 V, and 5.0V ersions, and +25 V for the 12 V and15 V versions, to force the output transistor “off”. 7. Vin = 40 V.HTC4Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2)LM2596HTC5Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2)Feedback Pin Bias CurrentLM2596HTC6Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorTest Circuit and Layout GuidelinesLM2596Figure 2. Typical Test Circuits and Layout GuideAs in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible. For best results, external components should be located as close to the switcher lC as possible using ground plane construction or single point grounding. If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor. Allowing the inductor flux to intersect sensitive feedback, lC groundpath and COUT wiring can cause problems. When using the adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor.HTC7Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PIN FUNCTION DESCRIPTION Symbol 1VinDescription This pin is the positive input supply for the LM2596 step–down switching23 45regulator.In order to minimize voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present .(Cin in Figure 1). Output This is the emitter of the internal switch. The saturation voltage Vsat of this output switch is typically 1.5 V. It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling to sensitive circuitry. Circuit ground pin. See the information about the printed circuit board layout. Gnd Feedback This pin senses regulated output voltage to complete the feedback loop. The signal is divided by the internal resistor divider network R2, R1 and applied to the non–inverting input of the internal error amplifier. In the Adjustable version of the LM2596 switching regulator this pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to allow programming of the output voltage. ON/OFF It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply current to approximately 80 mA. The threshold voltage is typically 1.4 V. Applying a voltage above this value (up to +Vin) shuts the regulator off. If the voltage applied to this pin is lower than 1.4V or if this pin is left open, the regulator will be in the "on" conditionHTC8Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PACKAGES DIMENSION : TO220-5LHTC9Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorPACKAGES DIMENSION : TO220V-5LLM2596HTC10Oct 2004 - Rev 0元器件交易网3.0A, 15V, Step-Down Switching RegulatorLM2596PACKAGES DIMENSION : TO263-5LHTC11Oct 2004 - Rev 0。

LM2596芯片资料

150kHz, 3A PWM Buck DC/DC ConverterLM2596-XXE5/F5DescriptionThe LM2596-XXE5/F5 series of regulators are monolithic ICs that provide all active functions for a step-down (buck switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltage of 3.3V, 5V, 12V and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed- frequency oscillator.The LM2596-XXE5/F5 series operates at a switching frequency of 150kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in standard 5-lead TO-220 and TO-263 packages with several different lead bend options. A standard series of inductors are available from several different manufacturers optimized for use with the LM2596-XXE5/F5 series. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring 80μA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.Features●3.3V, 5V, 12V, and adjustable output versions● Adjustable version output voltage range, 1.3V to 37V±4% max over line and load conditions● 150kHz±15% fixed switching frequency● TTL shutdown capability● Operating voltage can be up to 40V● Output load current:3A● TO220-5L and TO263-5L packages● Low power standby mode.● Thermal shutdown and current limit protection.● High efficiency● Built-in switching transistor on chip● Requires only 4 external components● Use readily available standard inductorsApplications● Simple high-efficiency step-down (buck regulator.● Positive to negative co nverter (Buck-Boost.● On-card switching regulators.Pin AssignmentBlock DiagramOrdering InformationAbsolute Maximum Ratings (Note 1Parameter Symbol Value UnitSupply V oltage V CC 45 V On/Off Pin Input V oltage V SD -0.3 ~ +25 V Feedback Pin V oltage V FB -0.3 ~ +25 V Output V oltage to Ground V OUT -1 V Power Dissipation P D Internally Limited W Operating Temperature Topr -40 ~ +125 ℃Storage Temperature Tstg -65 ~ +150 ℃ Operating V oltage V OP +4.5 ~ +40 VESD Susceptibility (Note 2 2000 VElectrical Characteristics (All Output Voltage VersionsSpecifications with boldface type are for full operating temperature range, the other type are for T J =25°C.(Unless otherwise specified, V IN =12V for the 3.3V , 5V , and adjustable version and V IN =24V for the 12V version, I LOAD =500mAParameter Symbol Test Condition Min Typ Max UnitDevice parameters50Feedback Bias CurrentIbAdjustable Version Only, V FB = 1.3V- 10 100nA127 173Oscillator Frequency f O (Note 6110 150 173KHz 1.4Saturation V oltage V SAT I OUT =3A (Note 7, 8 - 1.16 1.5 V Max Duty Cycle (ON100 Min Duty Cycle(OFF DC (Note 8(Note 9 - 0- % 3.6 6.9Current LimitI CL Peak Current ( Note 7, 83.44.5 7.5A Output=0V (Note 7, 9 - - 50 μA Output Leakage Current I LOutput=-1V (Note 10 - 2 30 mA Quiescent Current I Q (Note 9 - 5 10 mA200Standby Quiescent CurrentI STBY ON/OFF pin=5V (Note 10 - 80 250μATO-220-5L - 2 - θJC TO-263-5L Junction to Case- 3.5 - /W℃TO-220-5L- 50 - Thermal Resistance θJA (Note11 TO-263-5L Junction to Ambient - 23 -/W ℃ON/OFF ControlV IH Low (Regulator ON - 0.6 ON/OFF Pin Logic Input Threshold Voltage V IL High (Regulator OFF2.0 1.3 - V I IH V LOGIC =2.5V (Regulator OFF - 5 15 ON/OFF Pin Input CurrentI ILV LOGIC =0.5V (Regulator ON-0.025μAElectrical Characteristics (ContinuedSpecifications with boldface type are for full operating temperature range, the other type are for T J=25°C.Part No. Parameter Symbol Conditions Min Typ(Note 3Max (Note 4UnitsOutput V oltage V OUT 4.75V≤V IN≤40V, 0.2A≤I LOAD≤3A 3.1683.1353.33.4323.465VLM2596-3.3Efficiency ηV IN=12V, I LOAD=3A - 73 - %Output V oltage V OUT7V≤V IN≤40V, 0.2A≤I LOAD≤3A 4.8004.7505.05.2005.250VLM2596-5.0Efficiency ηV IN=12V, I LOAD=3A - 80 - %Output V oltage V OUT15V≤V IN≤40V, 0.2A≤I LOAD≤3A 11.5211.4012.012.4812.60VLM2596-12Efficiency ηV IN=25V, I LOAD=3A - 90 - %Output Feedback V FB4.5V≤V IN≤40V, 0.2A≤I LOAD≤3AV OUT programmed for 3V1.1801.1681.2301.2801.292VLM2596-ADJEfficiency ηV IN=12V, V OUT=3V, I LOAD=3A - 77 - % Note 1 :Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. Forguaranteed specifications and test conditions, see the Electrical Characteristics.Note 2 : The human body model is a 100pF capacitor discharged through a 1.5K resistor into each pin.Note 3 : Typical numbers are at 25℃ and represent the most likely norm.Note 4 : All limits guaranteed at room temperature (standard face type and at temperature extremes(bold face type. All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation usingstandard Statistical Quality Control (SQC methods. All limits are used to calculate Average Outgoing Quality Level(AOQL.Note 5 : External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance.Note 6 : The switching frequency is reduced when the second stage current limit is activated.Note 7 : No diode, inductor or capacitor connected to output pin.Note 8 : Feedback pin removed from output and connected to 0V to force the output transistor switch ON.Note 9 : Feedback pin removed from output and connected to +12V for the 3.3V, 5V and adjustable version, and +15V for the 12V version, to force the output transistor switch OFF.Note 10 : V IN=40V.Note 11 : Junction to Ambient thermal resistance. (With copper area of approximately 3 in²Typical Performance Characteristics (circuit of Figure 2Typical Performance Characteristics(Cont.Typical Performance Characteristics(Cont.Typical Performance Characteristics(Cont.Typical Application CircuitTO-263-5L DimensionInches Millimeters Inches Millimeters LM2596□□□ □□□□Date CodeDIMMin. Max. Min. Max. DIMMin. Max. Min. Max.A 0.173 0.189 4.40 4.80 L5 0.244 0.260 6.20 6.60 b 0.030 0.039 0.76 1.00 c1 0.0490.057 1.25 1.45 c 0.014 0.020 0.36 0.50 L 0.522 0.561 13.25 14.25 D 0.339 0.354 8.60 9.00 e 0.067 REF 1.70 REF E 0.386 0.409 9.80 10.4 L1 0.102 0.114 2.60 2.89 L4 0.579 0.602 14.7 15.3 φ 0.146 0.156 3.71 3.96Notes: 1.Controlling dimension: millimeter2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.Material:• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0CYStech Electronics Corp. TO-263-5L Dimension Spec. No. : C548F5 Issued Date : 2007.12.11 Revised Date : Page No. : 11/12 Marking: LM2596□□□ Date Code □□□□ Vout: 3.3V→-33 5.0V→-50 12V→-12 ADJ→ blank Style: Pin 1.Vin 2.Vout 3.GND4.Feedback5.ON/OFF 5-Lead TO-263-5L Plastic Package CYStek Package Code: F5 DIM A b L4 c L1 E Inches Min. Max. 0.173 0.189 0.026 0.036 0.000 0.012 0.014 0.020 0.090 0.110 0.386 0.409 Millimeters Min. Max. 4.40 4.80 0.66 0.91 0.00 0.30 0.36 0.50 2.29 2.79 9.80 10.4 DIM c2 L2 D e L θ Inches Min. Max. 0.049 0.057 0.050 REF 0.3390.354 0.067 REF 0.575 0.622 0° 8° Millimeters Min. Max. 1.25 1.45 1.27 REF 8.60 9.001.70 REF 14.6 15.8 0° 8° Notes: 1.Controlling dimension :millimeter2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.3.If there is any question with packing specification or packing method, please contact your loca l CYStek sales office. Material: • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 Recommended wave soldering condition Product Pb-free devices LM2596-XXE5/F5Peak Temperature 260 +0/-5 °C Soldering Time 5 +1/-1 seconds CYStek Product SpecificationCYStech Electronics Corp. Recommended temperature profile for IR reflow Spec. No. : C548F5 Issued Date : 2007.12.11 Revised Date : Page No. : 12/12 Profile feature Average ramp-up rate (Tsmax to Tp Preheat −Temperature Min(TS min −Te mperature Max(TS max −Time(ts min to ts max Time maintained above: −Temperature (TL − Time (tL Peak Temperature(TP Time within 5°C of actual peak temperature(tp Ramp down rate Time 25 °C to peak temperature Sn-Pb eutectic Assembly 3°C/second max. 100°C 150°C 60-120 seconds 183°C 60-150 seconds 240 +0/-5 °C 10-30 seconds 6°C/second max. 6 minutes max. Pb-free Assembly 3°C/second max. 150°C 200°C 60-180 seconds 217°C 60-150 seconds 260 +0/-5 °C 20-40 seconds 6°C/second max. 8 minutes max. Note : All temperatures refer to topside of the package, measured on the package body surface. Important Notice: • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek. • CYStek reserves the right to make changes to its products without notice. • CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. • CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. LM2596-XXE5/F5 CYStek Product Specification。