MAX4376-MAX4377-MAX4378高边电流检测

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基于max4172的电流检测电路设计与实现

基于max4172的电流检测电路设计与实现
《基于MAX4172的电流检测电路设计与实现》
电流检测是电子设备中常见的功能之一，它能够实时监测电路中的电流变化并提供反馈，以便及时调整电路工作状态。

基于MAX4172的电流检测电路是一种常用的设计方案，本文将介绍如何设计并实现这样一种电路。

MAX4172是一款精密电流检测放大器，具有高精度和低功耗的特点，因此非常适合用于电流检测电路的设计。

在设计电流检测电路时，首先需要选择合适的电流检测范围，然后根据所选范围选择合适的电流检测放大器。

MAX4172可提供多种增益范围的选择，因此可以满足不同范围电流的检测需求。

设计电流检测电路时，需要考虑电路的精度、稳定性和抗干扰能力。

MAX4172具有高精度和低温漂特性，能够提供稳定的输出，并具有较强的抗干扰能力，能够满足电子设备在复杂环境下的工作要求。

此外，MAX4172还具有低功耗和小封装体积的特点，使得它在电子设备中的应用更加灵活方便。

在实现电流检测电路时，除了选择合适的电流检测放大器外，还需要考虑电路的稳定性和可靠性。

通过合理布局电路和选择优质的元器件，可以有效提高电路的稳定性和可靠性。

此外，对于需要远距离传输电流检测信号的应用场景，还可以添加适当的滤波电路和保护电路，以确保信号的完整性和安全性。

综上所述，基于MAX4172的电流检测电路设计与实现是一项关键的工作，通过选用合适的电流检测放大器、合理设计电路和加强稳定性与可靠性的控制，可以实现一个高精度、高稳定性的电流检测电路，满足不同电子设备的需求。

西门子变频器M430说明书

无论故障出现在控制设备的什么地方都有可能导致重大的设备损坏甚至是严重的人身伤害即存在潜在的危险故障因此还必须采取附加的外部预防措施或者另外装设用于确保安全运行的装置即使在故障出现时也应如此例如独立的限流开关机械联锁等
MICROMASTER 430
7.5 kW - 250 kW
使用说明书
版本 10/06
有关调试的
警告
!
¾ 未经培训合格的人员在变频器的器件/系统上工作或不遵守“警告”中的有关规定，就可能造
成严重的人身伤害或重大的财产损失。只有在设备的设计、安装、调试和运行方面受过培训的经过认证合格的专业人员才允许在本设备的器件/系统上进行工作。
¾ 输入电源线只允许永久性紧固连接。设备必须接地(按照 IEC 536 Class 1、NEC 和其它适用的标准)。
有关维修的
警告
!
¾ 设备的维修只能由西门子公司的服务部门，西门子公司授权的维修中心或经过认证合格并得
到授权的人员进行，这些人员应当十分熟悉本说明书中提出的所有警告和操作步骤。
¾ 任何有缺陷的部件和器件都必须用相应的备件更换。
¾ 在打开设备进行维修之前，一定要断开电源。
有关拆卸和废品处理的
注意 ¾ 变频器的包装箱是可以重复使用的。请保管好包装箱以备将来使用或把它返还给制造商。 ¾ 易卸螺丝和快速插接器便于您拆卸设备的部件。您可以回收这些拆卸下来的部件，并根据地
是其第§8 节关于“带电部件上工作时允许的安全距离”的规定。实际操作时，应该使用适当的电子器具。 ¾ 在安装和调试变频器之前，请您务必仔细阅读这些安全规则和警告，以及设备上粘贴的所有警示标志。确保警示标志置于醒目的地方，并更换已经脱落或损坏的标志。
MICROMASTER 430 使用说明书

MAX9918／19／20：高边电流检测放大器

出的ＦＡＮ４１７４以及具有双通道的ＦＡＮ４２７４，为便携和消
＝ＧＮＤ时，这三款器件工作在单向放大器模式；ＶＲＥＦ，Ｎ＝
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采用ＳＴ新系统级芯片
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需要小体积及高分辨率
现引人注目的电视服务
的其他位置检测应用。
和全新的高价值内容业务模式，电视观众将获
ＡＳ５０５５集成了４个霍尔传感元件、１个１２
得丰富多彩且直观的使
位角度编码器、１个智
用体验。
能电源管理控制器和１个易于使用的３线或４线ＳＰＩ通信接口。
新系列代号为Ｆｒｅｅｍａｎ，为性能和软件可升级的系统
这款低功耗编码器采用小型４ｍｍｘ４ｍｍＱＦＮ封装，
级芯片，ＦＬＩ７５１０是其中首款产品，定位于主流和高端数根据读出速率，电流消耗降低到了微安级，如每秒１０次测
字电视细分市场。此外，ＦＬＩ７５１０的设计能够满足绿色节量平均５０ｐＡ。
能消费电子设备日益严格的系统能耗标准。匿囡豳
编码器系统的组装只需要少量片上无源元件和１个旋转
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MAX44242 低输入偏置电流、低噪声操作放大器 (OP 放大器) 评估套件说明书

General DescriptionThe MAX44242 evaluation kit (EV kit) provides a prov-en design to evaluate the MAX44242 low-input biascurrent, low-noise operational amplifier (op amp) in an8-pin µMAX ® package. The EV kit circuit is preconfig-ured as noninverting amplifiers, but can be adapted toother topologies by changing a few components. Thecomponent pads accommodate 0805 packages, makingthem easy to solder and replace. The EV kit comes with aMAX44242AUA+ installed.Features and Benefits●Accommodates Multiple Op-Amp Configurations●Rail-to-Rail Outputs●Accommodates Easy-to-Use 0805 Components● 2.7V to 20V Single Supply or ±1.35V to Q 10V DualSupplies●Proven PCB Layout●Fully Assembled and TestedQuick StartRequired Equipment●MAX44242 EV kit●+5V, 10mA DC power supply (PS1)●Two precision voltage sources●Two digital multimeters (DMMs)Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation:1) Verify that the jumpers are in their default position, as shown in Table 1.2) Connect the positive terminal of the +5V supply to VDD and the negative terminal to GND and VSS.3) Connect the positive terminal of the precision voltage source to INAP . Connect the negative terminal of the precision voltage source to GND.4) Connect INAM to GND.5) Connect the positive terminal of the second precision voltage source to the INBP pad. Connect the nega-tive terminal of the precision voltage source to GND.6) Connect INBM to GND.7) Connect the DMMs to monitor the voltages on OUTA and OUTB. With the 10kΩ feedback resistors and 1kΩ series resistors, the gain of each noninverting amplifier is +11.8) Turn on the +5V power supply.9) Apply 100mV from the precision voltage sources. Observe the output at OUTA and OUTB on the DMMs. Both should read approximately +1.1V.10) Apply 400mV from the precision voltage sources. Both OUTA and OUTB should read approximately +4.4V.19-6917; Rev 0; 2/14Ordering Information appears at end of data sheet.μMAX is a registered trademark of Maxim Integrated Products, Inc.Detailed Description of HardwareThe MAX44242 EV kit provides a proven layout for theMAX44242 low input bias current, low-noise dual op amp.The IC is a single-supply dual op amp whose primaryapplication is operating in the noninverting configuration;however, the IC can operate with a dual supply as long asthe voltage across the VDD and GND pins of the IC do notexceed the absolute maximum ratings. When operatingwith a single supply, short VSS to GND.Op-Amp Configurations The IC is a single-supply dual op amp ideal for differential sensing, noninverting amplification, buffering, and filter-ing. A few common configurations are shown in the next few sections.The following sections explain how to configure one of the device’s op amps (op-amp A). To configure the device’s second op amp (op-amp B), the same equations can be used after modifying the component reference designa-tors. For op-amp B, the equations should be modified by adding 10 to the number portion of the reference designa-tors (e.g., for the noninverting configuration, equation R1 becomes R11 and R5 becomes R15).Noninverting ConfigurationThe EV kit comes preconfigured as a noninvertingamplifier. The gain is set by the ratio of R5 and R1. TheEV kit comes preconfigured for a gain of +11. The outputvoltage for the noninverting configuration is given by the equation below:OUTA INAP R5V 1V R1 =+ *Default position.JUMPERSHUNT POSITION DESCRIPTION JU1Installed*Connects INAM to R1. Also shorts capacitor C5.OpenConnects INAM to R1 through capacitor C5. When AC-coupling is desired, remove the shunt and install capacitor C5. JU2Installed*Connects INAP to JU3 position 1. Also shorts capacitor C6. OpenConnects INAP to JU3 position 1 through capacitor C6. When AC-coupling is desired, remove the shunt and install capacitor C6. JU31-2*Connects INAP to JU2 and C6 through R2 and R82-3Connects INAP to GND through R2 and R8JU4Installed*Connects OUTA to OUTA OpenConnects OUTA to OUTA through capacitor C10. When AC-coupling is desired, remove the shunt and install capacitor C10. JU5Installed*Connects INBM to R11. Also shorts capacitor C15. OpenConnects INBM to R11 through capacitor C15. When AC-coupling is desired, remove the shunt and install capacitor C15. JU6Installed*Connects INBP to JU6 position 1. Also shorts capacitor C16. OpenConnects INBP to JU6 position 1 through capacitor C16. When AC-coupling is desired, remove the shunt and install capacitor C16. JU71-2*Connects INBP to JU7 and C16 through R12 and R182-3Connects INBP to GND through R12 and R18JU8Installed*Connects OUTB to OUTB Open Connects OUTB to OUTB through capacitor C20. When AC-coupling is desired, remove the shunt and install capacitor C20.R1–R3, and R5 with appropriate resistors. WhenR1 = R2 and R3 = R5, the CMRR of the differential ampli-fier is determined by the matching of the resistor ratiosR1/R2 and R3/R5.OUTA INAP INAM V GAIN (V V )=−where:R5R3GAIN R1R2==Sallen-Key Filter ConfigurationThe Sallen-Key filter topology is ideal for filtering sensorsignals with a second-order filter and acting as a buffer.Schematic complexity is reduced by combining the filterand buffer operations. The EV kit can be configured ina Sallen-Key topology by replacing and populating afew components. The Sallen-Key topology is typicallyconfigured as a unity-gain buffer, which can be done byreplacing R1 and R5 with 0Ω resistors and short JU2. Thenoninverting signal is applied to the INAP test point withJU2 short and short pins 1-2 on JU3 or do the same on theINBP pad similarly. The filter component pads are R2–R4,and R8, where some have to be populated with resistorsand others with capacitors.Lowpass Sallen-Key FilterTo configure the Sallen-Key as a lowpass filter, populatethe R2 and R8 pads with resistors, and populate the R3and R4 pads with capacitors. The corner frequency and Qare then given by:C R3R2R8f Q ==the R3 and R4 pads with resistors and populate the R2 and R8 pads with capacitors. The corner frequency and Qare then given by:C R4R2R8f Q ==Transimpedance Application To configure op-amp U1-A as a transimpedance amplifier (TIA), replace R1 with a 0Ω resistor and install a shunt on jumper JU1 and shunt on pins 2-3 on jumper JU3. The output voltage of the TIA is the input current multiplied by the feedback resistor:OUT IN BIAS OS V (I I )R4V =+×+where R4 is installed as a 10kΩ resistor, I IN is defined as the input current source applied at the INAM pad, I BIAS is the input bias current, and V OS is the input offset voltage of the op amp. Use capacitor C8 (and C7, if applicable) to stabilize the op amp by rolling off high-frequency gain due to a large cable capacitance. Similarly, we can configure op-amp U1-B for transimpedance application.Capacitive Loads Some applications require driving large capacitive loads. To improve the stability of the amplifier, replace R6 (R16 for U1-B) with a suitable resistor value to improve ampli-fier phase margin. The R6/C9 (R16/C19 for U1-B) filter can also be used as an anti-alias filter, or to limit amplifier output noise by reducing its output bandwidth.DESIGNATION QTY DESCRIPTIONC1, C320.1µF ±10%, 25V X7R ceramic capacitors (0805)C2, C424.7µF ±10%, 25V X5R ceramic capacitors (0805)C5–C10, C15–C200Not installed, ceramic capacitors(0805)GND2Black test points INAM, INAP,INBM, INBP,OUTA, OUTB,VDD, VSS8Red test pointsJU1, JU2,JU4–JU6, JU862-pin headers JU3, JU723-pin headers DESIGNATION QTY DESCRIPTION R1, R2,R11, R1241kΩ ±1% resistors (0805)R3, R4, R7,R13, R14, R170Not installed, resistors (0805) R5, R15210kΩ ±1% resistors (0805)R6, R8,R16, R1840Ω ±5% resistors (0805) TP1, TP20Not installed, miniature test points U11Dual low-power, rail-to-rail I/O opamp (8 µMAX)Maxim MAX44242AUA+—8Shunts—1PCB: MAX44242 EVKITFigure 1. MAX44242 EV Kit SchematicFigure 3. MAX44242 EV Kit PCB Layout—Component SideComponent SideFigure 4. MAX44242 EV Kit PCB Layout—Solder SidePART TYPE MAX44242EVKIT#EV Kit #Denotes ROHS compliant.Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.REVISIONNUMBERREVISION DATE DESCRIPTION PAGES CHANGED 02/14Initial release —For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at .。

MAX4376FAUK中文资料

GAIN
SUFFIX
20
T
50
F
100
H
For example, MAX4376TAUK is a single high-side amplifier with a gain of 20.
High-side current monitoring is especially useful in battery-powered systems since it does not interfere with the ground path of the battery charger. The input common-mode range of 0 to +28V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a battery pack in deep discharge.
-40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C
5 SOT23-5 5 SOT23-5 5 SOT23-5 8 SO 8 SO 8 SO
ADOG ADOH ADOI
Applications
Notebook Computers
Current-Limited Power Supplies
Fuel Gauges in PC
General-System/BoardLevel Current Monitoring

Nsiway NNSS44335588 超低EMI、无需滤波器、5W+3W×2的2.1声道用户手

10.1
TQFN4×4-28 封装尺寸................................................................................................................... 18
10.2
SOP-28 封装尺寸............................................................................................................................ 19
7.3
NS4358 引脚功能描述 ..................................................................................................................... 9
7.4
芯片印章说明 ................................................................................................................................. 10
NS4358
超低EMI、无需滤波器、5W+3W×2的2.1声道+3D环绕立体声数字音频功放
NS4358 用户手册 V1.1
深圳市纳芯威科技有限公司 2011 年 10 月
Nsiway
1
日期
2011-3-11 2011-10-11
NS4358
超低EMI、无需滤波器、5W+3W×2的2.1声道+3D环绕立体声数字音频功放

德州仪器MAX4372-MAX4372T 电流检测放大器用户手册说明书

General DescriptionThe MAX4372 low-cost, precision, high-side current-sense amplifier is available in a tiny, space-saving SOT23 5-pin package. Offered in three gain versions (T = 20V/V, F = 50V/V, and H = 100V/V), this device oper-ates from a single 2.7V to 28V supply and consumes only 30μA. It features a voltage output that eliminates the need for gain-setting resistors and is ideal for today’s notebook computers, cell phones, and other systems where battery/ DC current monitoring is critical.High-side current monitoring is especially useful in bat-tery-powered systems since it does not interfere with the ground path of the battery charger. The input common-mode range of 0 to 28V is independent of the supply volt-age and ensures that the current-sense feedback remains viable even when connected to a 2-cell battery pack in deep discharge.The user can set the full-scale current reading by choos-ing the device (T, F, or H) with the desired voltage gain and selecting the appropriate external sense resistor. This capability offers a high level of integration and flex-ibility, resulting in a simple and compact current-sense solution. For higher bandwidth applications, refer to the MAX4173T/F/H data sheet.Applications●Power-Management Systems●General-System/Board-Level Current Monitoring●Notebook Computers●Portable/Battery-Powered Systems●Smart-Battery Packs/Chargers●Cell Phones●Precision-Current Sources Features●Low-Cost, Compact Current-Sense Solution●30μA Supply Current● 2.7V to 28V Operating Supply●0.18% Full-Scale Accuracy●0.3mV Input Offset Voltage●Low 1.5Ω Output Impedance●Three Gain Versions Available• 20V/V (MAX4372T)• 50V/V (MAX4372F)• 100V/V (MAX4372H)●High Accuracy +2V to +28V Common-Mode Range,Functional Down to 0V, Independent of SupplyVoltage●Available in a Space-Saving 5-Pin SOT23 Packageand 3 x 2 UCSP™ (1mm x 1.5mm) Package Ordering Information appears at end of data sheet.UCSP is a trademark of Maxim Integrated Products, Inc.19-1548; Rev 5; 5/11+Denotes lead(Pb)-free/RoHS-compliant package.T = Tape and reel.*Note: Gain values are as follows: 20V/V for the T version,50V/V for the F version, and 100V/V for the H version. Current-Sense Amplifier with Voltage OutputPin ConfigurationsOrdering InformationPARTTEMPRANGEPIN-PACKAGETOPMARK MAX4372T EUK+T-40°C to +85°C 5 SOT23ADIU MAX4372TESA+-40°C to +85°C8 SO—MAX4372TEBT+T-40°C to +85°C 3 x 2 UCSP ACXV CC , RS+, RS- to GND .........................................-0.3V to +30V OUT to GND ..........................................................-0.3V to +15V Differential Input Voltage (V RS+ - V RS-) .............................±0.3V Current into Any Pin .........................................................±10mA Continuous Power Dissipation (T A = +70°C)5-Pin SOT23 (derate 3.9mW/°C above +70°C) .......312.6mW 8-Pin SO (derate 7.4mW/°C above +70°C) ..............588.2mW 3 x 2 UCSP (derate 3.4mW/°C above +70°C) .........273.2mWOperating Temperature Range ...........................-40°C to +85°C Storage Temperature Range ............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C(V RS+ = 0 to 28V, V CC = 2.7V to 28V, V SENSE = 0V, R LOAD = 1MΩ, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)Current-Sense Amplifier with Voltage OutputAbsolute Maximum RatingsStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Electrical CharacteristicsPARAMETERSYMBOL CONDITIONSMIN TYPMAX UNITS Operating Voltage Range (Note 2)V CC 2.728V Common-Mode Input Range (Note 3)V CMR 028V Common-Mode Rejection CMR V RS+ > 2V85dB Supply Current I CC V RS+ > 2V, V SENSE = 5mV 3060μA Leakage CurrentI RS+, I RS-V CC = 0V, V RS+ = 28V 0.051.2μAInput Bias CurrentI RS+V RS+ > 2V 01μAV RS+ ≤ 2V -25+2I RS-V RS+ > 2V 02V RS+ ≤ 2V-50+2Full-Scale Sense Voltage (Note 4)V SENSEGain = 20V/V or 50V/V 150mV Gain = 100V/V 100Input Offset Voltage (Note 5)V OST A = +25°CV CC = V RS+ = 12V MAX4372_ESA 0.3±0.8mVMAX4372_EUK, _EBT 0.3±1.3T A = T MIN to T MAX V CC = V RS+ = 12VMAX4372_ESA ±1.1MAX4372_EUK, _EBT±1.9Full-Scale Accuracy (Note 5)V SENSE = 100mV, V CC = 12V,V RS+ = 12V, T A = +25°C (Note 7)±0.18±3%Total OUT Voltage Error (Note 6)V SENSE = 100mV, V CC = 12V,V RS+ = 12V (Note 7)±6V SENSE = 100mV, V CC = 28V,V RS+ = 28V (Note 7)±0.15±7V SENSE = 100mV, V CC = 12V,V RS+ = 0.1V (Note 7)±1±28V SENSE = 6.25mV, V CC = 12V,V RS+ = 12V (Note 8)±0.15(V RS+ = 0 to 28V, V CC = 2.7V to 28V, V SENSE = 0V, R LOAD = 1MΩ, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)Note 1: All devices are 100% production tested at T A = +25°C. All temperature limits are guaranteed by design.Note 2: Guaranteed by PSR test.Note 3: Guaranteed by OUT voltage error test.Note 4: Output voltage is internally clamped not to exceed 12V.Note 5: V OS is extrapolated from the gain accuracy tests.Note 6: Total OUT voltage error is the sum of gain and offset voltage errors.Note 7: Measured at I OUT = -500μA (R LOAD = 4kΩ for gain = 20V/V, R LOAD = 10kΩ for gain = 50V/V, R LOAD = 20kΩ for gain = 100V/V).Note 8: 6.25mV = 1/16 of 100mV full-scale voltage (C/16).Note 9: The device does not reverse phase when overdriven.Current-Sense Amplifier with Voltage OutputElectrical Characteristics (continued)PARAMETERSYMBOL CONDITIONSMINTYP MAXUNITSOUT Low Voltage(MAX4372T, MAX4372F)V OLV CC = 2.7V,V SENSE = -10mV, V RS+ = 28V I OUT = 10μA 2.6mVI OUT = 100μA 965OUT Low Voltage (MAX4372H)V OLV CC = 2.7V,V SENSE = -10mV, V RS+ = 12VI OUT = 10μA 2.6mVI OUT = 100μA965OUT High VoltageV CC - V OHV CC = 2.7V, I OUT = -500μA, V SENSE = 250mV, V RS+ = 28V0.10.25V-3dB Bandwidth BWV RS+ = 12V,V CC = 12V,C LOAD = 10pFV SENSE = 20mV,gain = 20V/V275kHzV SENSE = 20mV,gain = 50V/V 200V SENSE = 20mV,gain = 100V/V 110V SENSE = 6.25mV50GainMAX4372T20V/VMAX4372F 50MAX4372H100Gain AccuracyV SENSE = 20mV to 100mV, V R S + = 12V T A = +25°C ±0.25±2.5%T A = -40°C to +85°C ±5.5OUT Settling Time to 1% of Final ValueGain = 20V/V, V CC = 12V, V RS+ = 12V, C LOAD = 10pFV SENSE = 6.25mV to 100mV20µsV SENSE = 100mV to 6.25mV20Capacitive-Load Stability No sustained oscillations1000pF OUT Output Resistance R OUT V SENSE = 100mV 1.5ΩPower-Supply Rejection PSRV OUT = 2V, V RS+ > 2V7585dB Power-Up Time to 1% of Final ValueV CC = 12V, V RS+ = 12V,V SENSE = 100mV, C LOAD = 10pF 0.5ms Saturation Recovery Time (Note 9)V CC = 12V, V RS+ = 12V, C LOAD = 10pF0.1ms(V CC = 12V, V RS+ = 12V, V SENSE = 100mV, T A = +25°C, unless otherwise noted.)Current-Sense Amplifier with Voltage OutputTypical Operating Characteristics25.027.530.032.535.0SUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (µA )121648202428-1.2-0.8-1.0-0.2-0.4-0.60.40.200.6010515202530TOTAL OUTPUT ERROR vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)O U T P U T E R R O R (%)00.20.40.60.81.01.21.41.610515202530TOTAL OUTPUT ERROR vs. COMMON-MODE VOLTAGECOMMON-MODE VOLTAGE (V)O U T P U T E R R O R (%)510152025303540-401060-153585SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )-1.0-0.50.501.01.5010050150200250300TOTAL OUTPUT ERROR vs. V SENSEV SENSE (mV)O U T P U T E R R O R (%)-1.0-0.9-0.8-0.7-0.6-0.5-0.4-0.3-0.2-0.10GAIN ACCURACY vs. TEMPERATURETEMPERATURE (°C)G A I N A C C U R A C Y (%)-401060-15358528.029.028.530.029.531.531.030.532.0SUPPLY CURRENTvs. COMMON-MODE VOLTAGECOMMON-MODE VOLTAGE (V)S U P P L Y C U R R E N T (µA )-45-90100100k10k 1k POWER-SUPPLY REJECTIONvs. FREQUENCY-75-85-55-65-40-70-80-50-60M A X 4372T t o c 06FREQUENCY (Hz)P S R (d B )-1.0-0.8-0.6-0.4-0.200.20.40.60.81.0-401060-153585TOTAL OUTPUT ERROR vs. TEMPERATURETEMPERATURE (°C)T O T A L O U T P U T E R R O R (%)(V CC = 12V, V RS+ = 12V, V SENSE = 100mV, T A = +25°C, unless otherwise noted.)Current-Sense Amplifier with Voltage OutputTypical Operating Characteristics (continued)V OUTV SENSE600mV200mV30mV10mV MAX4372TSMALL-SIGNAL TRANSIENT RESPONSEMAX4372T toc1020µs/div V OUTV SENSE1V3V50mV 150mV MAX4372TLARGE-SIGNAL TRANSIENT RESPONSEMAX4372T toc1320µs/divV OUTV SENSE 010V0100mV MAX4372HLARGE-SIGNAL TRANSIENT RESPONSE20µs/divMAX4372T toc15V OUTV SENSE2.5V7.5V50mV 150mVMAX4372FLARGE-SIGNAL TRANSIENT RESPONSE20µs/divMAX4372T toc143-81k100k10k1MSMALL-SIGNAL GAIN vs. FREQUENCY-7FREQUENCY (Hz)G A I N (d B)-6-5-4-3-2-1012V OUTV SENSE 1.5V0.5V30mV 10mVMAX4372FSMALL-SIGNAL TRANSIENT RESPONSEMAX4372T toc1120µs/div V OUTV SENSE 3V1V30mV10mV MAX4372HSMALL-SIGNAL TRANSIENT RESPONSEMAX4372T toc1220µs/divDetailed DescriptionThe MAX4372 high-side current-sense amplifier features a 0 to 28V input common-mode range that is indepen-dent of supply voltage. This feature allows the monitoring of current flow out of a battery in deep discharge, and also enables high-side current sensing at voltages far in excess of the supply voltage (V CC).Current flows through the sense resistor, generating a sense voltage (Figure 1. Functional Diagram). Since A1’s inverting input is high impedance, the voltage on the negative terminal equals V IN - V SENSE. A1 forces its positive terminal to match its negative terminal; therefore, the voltage across R G1 (V IN - V1-) equals V SENSE. This creates a current to flow through R G1 equal to V SENSE/ R G1. The transistor and current mirror amplify the current by a factor of β. This makes the current flowing out of the current mirror equal to:I M = β V SENSE/R G1A2’s positive terminal presents high impedance, so this current flows through R GD, with the following result:V2+ = R GD β x V SENSE/R G1R1 and R2 set the closed-loop gain for A2, which ampli-fies V2+, yielding:V OUT = R GD x β x V SENSE/R G1 (1 + R2/R1)The gain of the device equals:OUT SEN G1SE RGD x (1 + R2/R1)V V/Rβ=Applications Information Recommended Component ValuesThe MAX4372 operates over a wide variety of current ranges with different sense resistors. Table 1 lists com-mon resistor values for typical operation of the MAX4372.Choosing R SENSEGiven the gain and maximum load current, select R SENSE such that V OUT does not exceed V CC - 0.25V or 10V. To measure lower currents more accurately, use a high value for R SENSE. A higher value develops a higher sense volt-age, which overcomes offset voltage errors of the internal current amplifier.In applications monitoring very high current, ensure R SENSE is able to dissipate its own I2R losses. If the resistor’s rated power dissipation is exceeded, its value may drift or it may fail altogether, causing a differential voltage across the terminals in excess of the absolute maximum ratings.Figure 1. Functional DiagramCurrent-Sense Amplifier with Voltage OutputPin/Bump DescriptionPIN BUMPNAME FUNCTIONSOT23SO UCSP13A2GND Ground24A3OUT Output Voltage. V OUT is proportional to the magnitude of V SENSE (V RS+ - V RS-).31A1V CC Supply Voltage. Use at least a 0.1μF capacitor to decouple V CC from fast transients.48B1RS+Power Connection to the External Sense Resistor56B3RS-Load-Side Connection to the External Sense Resistor —2, 5, 7—N.C.No Connection. Not internally connected.Using a PC Board Trace as R SENSEIf the cost of R SENSE is an issue and accuracy is not criti-cal, use the alternative solution shown in Figure 2. This solution uses copper PC board traces to create a sense resistor. The resistivity of a 0.1in wide trace of 2oz copper is about 30mΩ/ft. The resistance temperature coefficient of copper is fairly high (approximately 0.4%/°C), so sys-tems that experience a wide temperature variance must compensate for this effect. In addition, self-heating intro-duces a nonlinearity error. Do not exceed the maximum power dissipation of the copper trace.For example, the MAX4372T (with a maximum load cur-rent of 10A and an R SENSE of 5mΩ) creates a full-scale V SENSE of 50mV that yields a maximum V OUT of 1V. R SENSE, in this case, requires about 2in of 0.1in wide copper trace.UCSP Applications InformationFor the latest application details on UCSP construction, dimensions, tape carrier information, printed circuit board techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, go to the Maxim’s website at /ucsp to find the Application Note: UCSP—A Wafer-Level Chip-Scale Package.Figure 2. Connections Showing Use of PC BoardTable 1. Recommended Component ValuesCurrent-Sense Amplifier with Voltage OutputFULL-SCALE LOAD CURRENT,I LOAD (A)CURRENT-SENSERESISTOR,R SENSE (mΩ)GAIN(V/V)FULL-SCALE OUTPUTVOLTAGE (FULL-SCALEV SENSE = 100mV),V OUT (V)0.1100020 2.0 50 5.0 10010.0110020 2.0 50 5.0 10010.052020 2.0 50 5.0 10010.0101020 2.0 50 5.0 10010.0Current-Sense Amplifier with Voltage Output Ordering Information (continued)Pin Configurations (continued)PARTTEMPRANGEPIN-PACKAGETOPMARKMAX4372F EUK+T-40°C to +85°C 5 SOT23ADIV MAX4372FESA+-40°C to +85°C8 SO—MAX4372FEBT+T-40°C to +85°C 3 x 2 UCSP ACX MAX4372H EUK+T-40°C to +85°C 5 SOT23ADIW MAX4372HESA+-40°C to +85°C8 SO—MAX4372HEBT+T-40°C to +85°C 3 x 2 UCSP ACZChip InformationPROCESS: BiCMOS+Denotes lead(Pb)-free/RoHS-compliant package. T = Tape and reel.Current-Sense Amplifier with Voltage Output Package InformationFor the latest package outline information and land patterns (footprints), go to /packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.PACKAGE TYPE PACKAGE CODE OUTLINE ND PATTERN NO.5 SOT23U5+121-005790-01748 SO S8+221-004190-00965 UCSP B6+221-0097—Note: MAX4372_EBT uses package code B6-2.Current-Sense Amplifier with Voltage Output Package Information (continued)For the latest package outline information and land patterns (footprints), go to /packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.Current-Sense Amplifier with Voltage Output Package Information (continued)For the latest package outline information and land patterns (footprints), go to /packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Maxim Integrated │11Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.Current-Sense Amplifier with Voltage Output© 2011 Maxim Integrated Products, Inc. │ 12Revision HistoryREVISIONNUMBERREVISION DATE DESCRIPTION PAGES CHANGED 47/09Updated feature in accordance with actual performance of the product 155/11Updated V RST conditions to synchronize with tested material and addedlead-free designation 1–3, 8For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at .。

高端电流检测放大器性能分析 MAX4372

高端电流检测放大器性能分析 MAX4372 MAX4173 MAX4080文章发布人：gxy 共193人阅读文字大小：[ 大中小 ] 文字背景色：在讨论器件功能时，检流放大器可以看作一个输入级浮空的仪表/差分放大器。

这意味着即使器件采用VCC=3.3V或5V单电源供电，在输入共模电压远高于电源电压的条件下，器件仍然能够正常放大差分输入信号。

检流放大器的共模电压可以很高，例如可以高达28V(MAX4372和MAX4173)或76V(MAX4080和MAX4081)。

检流放大器的这一特性使其非常适合高端电流检测应用，这类应用往往需要对高压侧检流电阻两端的微小电压进行放大，并馈入到低压ADC或低压模拟控制环路进行处理。

这种情况下，通常需要在信号源端(例如检流电阻两端)对电流检测信号进行滤波。

可以采用差分滤波器(图1)滤除负载电流和检流电压的“毛刺”，也可以采用共模滤波器(图2)以增强在出现共模电压尖峰或瞬时过压时的ESD 保护能力。

合理选择元件构建滤波器，如果元件选择不当，则会引入一些无法预知的失调电压和增益误差，降低电路性能。

滤波器的选择MAX4173检流放大器如图3所示，该器件的检流电阻可直接连接到芯片的RS+和RS-端。

器件内部的运算放大器将检流电阻两端的差分电压恢复成RG1两端的差分电压，即ILOAD×RSENSE=VSENSE=IRG1×RG1。

然后，内部电流镜对电流IRG1进行电平转换和放大，产生输出电流IRGD。

MAX4173的内部电路中RGD=12kΩ，而RG1=6kΩ。

因此，由于RGD和RG1为片上电阻，实际阻值会因不同的半导体工艺而产生多达±30%的差异。

但是，因为最终增益精度取决于RGD和RG1的比例，所以可以很好地控制增益，并在生产过程中灵活调整。

构建差分/共模滤波器(如图1和图2所示)时，需要在检流电阻的RSENSE+和RSENSE-端与器件的RS+和RS-引脚之间接入串联电阻，此时相当于改变了芯片的RG1和RG2。

MAX1978中文数据手册

用于Peltier模块的集成温度控制器概论MAX1978 / MAX1979是用于Peltier热电冷却器（TEC）模块的最小, 最安全, 最精确完整的单芯片温度控制器。

片上功率FET和热控制环路电路可最大限度地减少外部元件, 同时保持高效率。

可选择的500kHz / 1MHz开关频率和独特的纹波消除方案可优化元件尺寸和效率, 同时降低噪声。

内部MOSFET的开关速度经过优化, 可降低噪声和EMI。

超低漂移斩波放大器可保持±0.001°C的温度稳定性。

直接控制输出电流而不是电压, 以消除电流浪涌。

独立的加热和冷却电流和电压限制提供最高水平的TEC保护。

MAX1978采用单电源供电, 通过在两个同步降压调节器的输出之间偏置TEC, 提供双极性±3A输出。

真正的双极性操作控制温度, 在低负载电流下没有“死区”或其他非线性。

当设定点非常接近自然操作点时, 控制系统不会捕获, 其中仅需要少量的加热或冷却。

模拟控制信号精确设置TEC 电流。

MAX1979提供高达6A的单极性输出。

提供斩波稳定的仪表放大器和高精度积分放大器, 以创建比例积分（PI）或比例积分微分（PID）控制器。

仪表放大器可以连接外部NTC或PTC热敏电阻, 热电偶或半导体温度传感器。

提供模拟输出以监控TEC温度和电流。

此外, 单独的过热和欠温输出表明当TEC温度超出范围时。

片上电压基准为热敏电阻桥提供偏置。

MAX1978 / MAX1979采用薄型48引脚薄型QFN-EP 封装, 工作在-40°C至+ 85°C温度范围。

采用外露金属焊盘的耐热增强型QFN-EP封装可最大限度地降低工作结温。

评估套件可用于加速设计。

应用光纤激光模块典型工作电路出现在数据手册的最后。

WDM, DWDM激光二极管温度控制光纤网络设备EDFA光放大器电信光纤接口ATE特征♦尺寸最小, 最安全, 最精确完整的单芯片控制器♦片上功率MOSFET-无外部FET♦电路占用面积<0.93in2♦回路高度<3mm♦温度稳定性为0.001°C♦集成精密积分器和斩波稳定运算放大器♦精确, 独立的加热和冷却电流限制♦通过直接控制TEC电流消除浪涌♦可调节差分TEC电压限制♦低纹波和低噪声设计♦TEC电流监视器♦温度监控器♦过温和欠温警报♦双极性±3A输出电流（MAX1978）♦单极性+ 6A输出电流（MAX1979）订购信息* EP =裸焊盘。

FANUC 维修说明书

- 请于常温下(0～40℃)置于干燥（没有结露）的场所进行保存。电机的零部件会受损或者劣化。另外，在保存的时候，将轴水平放置，端子箱放在上端。
- 请不要拆毁标牌。标牌脱落时，注意保管。如果不知道电机的规格有可能会无法维护。如果是内置主轴电机，必须附加在主轴上。
- 请不要让电机受到冲击和损伤。这样会给电机的零部件带来不利的影响，从而导致电机不能正常运转。另外，塑料部分、传感器和绕组等部件属于易损件，所以操作的时候需要十分小心。特别要避免利用塑料部分、绕组和动力线抬起电机。
1.3.1.1 警告 ............................................................................................ s-8 1.3.1.2 注意 ............................................................................................ s-9 1.3.1.3 注释 .......................................................................................... s-10 1.3.2 试运行时的警告及注意................................................................. s-11 1.3.2.1 警告 .......................................................................................... s-11 1.3.2.2 注意 .......................................................................................... s-12 1.3.3 维护时的警告及注意..................................................................... s-13 1.3.3.1 警告 .......................................................................................... s-13 1.3.3.2 注意 .......................................................................................... s-14 1.3.3.3 注释 .......................................................................................... s-14

高边和低边电流检测技术分析

当代电子系统中的电源管理可以通过高效的电源分配优化系统效率。

电流检测是电源管理的关键技术之一，它不仅有助于保持理想的电压等级，而且能通过提供伺服调整保持电子系统处于正常状态，同时还能防止发生电路故障和电池过度放电。

电流的检测有两种基本的方案。

一种是测量电流流过的导体周围的磁场，另一种是在电流路径中插入一个小电阻，然后测量电阻上的压降。

第一种方法不会引起干扰或引入插损，但成本相对比较昂贵，而且容易产生非线性效应和温度系数误差。

因此磁场检测方法通常局限于能够承受与无插损相关的较高成本的应用。

本文主要讨论半导体行业中已经得到应用的电阻检测技术，它能为各种应用提供精确且高性价比的直流电流测量结果。

本文还介绍了高边和低边检测原理，并通过实际例子帮助设计师选择适合自己应用的最佳方法。

电阻检测在电流路径中以串联的方式插入一个低阻值的检测电阻会形成一个小的电压降，该压降可被放大从而被当作一个正比于电流的信号。

然而，根据具体应用环境和检测电阻的位置，这种技术将对检测放大器造成不同的挑战。

比如将检测电阻放在负载和电路地之间，那么该电阻上形成的压降可以用简单的运放进行放大(见图1B)。

这种方法被称为低边电流检测，与之相对应的方法为高边检测，即检测电阻放在电源和负载之间(见图1A)。

图1：上面简化的框图描述了一种基本的高边检测电路(图1A)和一种基本的低边检测电路(图1B)。

检测电阻值应尽可能低，以保持功耗可控，但也要足够大，以便产生能被检测放大器检测到并在目标精度内的电压。

值得注意的是，在检测电阻上得到的这种差分检测信号寄生在一个共模电压上，这个共模电压对低边检测方法来说接近地电平(0V)，但对高边检测方法来说就接近电源电压。

这样，测量放大器的输入共模电压范围对低边方案来说应包含地，对高边方案来说应包含电源电压。

由于低边检测时的共模电压接近地电平，因此电流检测电压可以用一个低成本、低电压的运放进行放大。

低边电流检测简单且成本低，但许多应用不能容忍由于检测电阻引入的地线干扰。

MAX4376-MAX4378中文资料

Applications
Notebook Computers
Current-Limited Power Supplies
Fuel Gauges in PC
General-System/BoardLevel Current Monitoring
Battery Chargers
Portable/Battery-Powered Systems
The MAX4376 is available in a tiny 5-pin SOT23 package. The MAX4377/MAX4378 are available in spacesaving 8-pin µMAX and 14-pin TSSOP packages, respectively.
-40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C
5 SOT23-5 5 SOT23-5 5 SOT23-5 8 SO 8 SO 8 SO
ADOG ADOH ADOI
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

max44284原理

MAX44284是一款高侧电流检测放大器，具有以下原理特点：
1.工作电源：MAX44284采用1.7V至5.5V的单电源供电，优化后的静态电流极低，仅为21µA。

2.精度：该器件提供精度为2 V VOS和增益误差为0.05%的规格，具有很高的测量精度。

3.输入共模电压范围：MAX44284的输入共模电压范围为-0.1V至+36V，这意味着它能够适应
宽广的电压范围。

4.输出：该器件具有电压输出，并提供了四种不同的增益版本，以满足不同的应用需求。

5.封装和温度范围：MAX44284采用小型6焊球、0.4毫米螺距WLP（1.3毫米x 0.9毫米）
和6引脚SOT23封装，并规定操作在-40℃至+125℃的汽车温度范围内，适应各种环境。

如需更多关于MAX44284的信息，建议访问相关厂商的官网或查阅电子元器件应用指南。

利用高边电流放大器构建28V断路器

利用高边电流放大器构建28V断路器
利用高边电流放大器构建28V断路器
利用MAX4373高边电流检测放大器进行设计，电路可工作在高达28V的
电压范围。

只需一个通用的NPN晶体管。

该“设计思路”发表在2006年6月1日的Power Electronics Technology杂志。

MAX4373是一款带有比较器和基准的高边检流放大器，比较器的闭锁输出(COUT1)使得该款器件能够构成电路断路器(请参考器件数据资料的图2)。

但是，数据资料给出的电路只适合+2.7V至+5.5V的供电电压范围。

通过增加一个通用的NPN晶体管，即可将电压范围扩展到28V，如图1所示。

图1. 该电路断路器中，NPN晶体管Q1扩展了比较器输出COUT1的摆幅。

正常工作情况下，漏极开路比较器输出为低电平，允许430µA的标称电流从晶体管的发射极，通过R2流入COUT1。

相同(近似相同)电流流过
集电极和R1，产生略高于-6.4V的VGS电压，驱动p沟道MOSFET。

在该设计中，断路器的电流门限为900mA。

由于MAX4373FESA从检流电阻到输出能够提供50V/V的增益，所以选择了这款器件。

当900mA电流流。

高边电流检测原理和电路

作者：Maxim公司Gert N.Helles 来源：《电子产品世界》高端电流检测的原理和电路摘要：本文介绍低端、高端检流电路的结构和它们的应用。

关键词：电流检测限流电流测量技术具有极为广泛的应用，许多系统中都需要检测流入、流出电流的大小。

例如，电流保护/电流监测设备、4-20mA电流环系统、可编程电流源、线性/开关模式电源、以及需要掌握流入流出电流比例的充电器或电池电量计量器。

由于很多应用是便携式的，因此电流检测电路还必须具有小体积、低功耗的特性。

高端/低端检流电路低端检流电路的检流电阻串联到地(图1），而高端检流电路的检流电阻是串联到高电压端(图2）。

两种方法各有特点：低端检流方式在地线回路中增加了额外的电阻，高端检流方式则要处理较大的共模信号。

图1所示的低端检流运放以地电平作为参考电平，检流电阻接在正相端。

运放的输入信号中的共模信号范围为：(GND-RSENSE*ILOAD）。

尽管低端检流电路比较简单，但有几种故障状态是低端检流电路检测不到的，这会使负载处于危险的情况，利用高端检流电路则可解决这些问题。

高端检流电路直接连到电源端，能够检测到后续回路的任何故障并采取相应的保护措施，特别适合于自动控制应用领域，因为在这些应用电路中通常采用机壳作为参考地。

传统高端检流电路传统的高端/低端检流方式有多种实现方案，绝大多数基于分立或半分立元件电路。

高端检流电路通常需要用一个精密运放和一些精密电阻电容，最常用的高端检流电路采用差分运放做增益放大并将信号电平从高端移位到参考地(图3）：VO=IRS*RS；R1=R2=R3=R4该方案已广泛应用于实际系统中，但该电路存在三个主要缺点：1）输入电阻相对较低，等于R1；2）输入端的输入电阻一般有较大的误差值；3）要求电阻的匹配度要高，以保证可接受的CMRR。

任何一个电阻产生1%变化就会使CMRR降低到46dB；0.1%的变化使CMRR达到66dB，0.01%的变化使CMRR达到86dB。

I-LINE高电流母线槽系统

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LC光纤跳线IECEN61300标准要求

2.2.1 检测条件................................................................................................................... 3 2.2.2 端面几何形状 3D 检测结果..................................................................................... 4 2.3 插入损耗测试 (IEC 61300-3-4 方法 B).............................................................................. 4 2.3.1 测试方法................................................................................................................... 5 2.3.2 插入损耗测试结果................................................................................................... 5 2.4 回波损耗(IEC 61300-3-6)..................................................................................................... 7 2.4.1 测试示意图............................................................................................................... 7 2.5 机械振动试验(IEC 61300-2-1/GR-326)............................................................................... 8 2.5.1 机械振动测试示意图............................................................................................... 8 2.5.2 试验结果................................................................................................................... 9 2.6 插拔耐久性(IEC 61300-2-2/GR326)................................................................................... 10 2.6.1 测试图..................................................................................................................... 10 2.6.2 试验结果................................................................................................................. 10 2.7 光缆直拉试验(GR-326)......................................................................................................... 12 2.7.1 试验方法................................................................................................................. 12 2.7.2 试验结果................................................................................................................. 12 2.8 耦合机构抗拉强度 (IEC 61300-2-6)................................................................................. 13 2.8.1 试验方法................................................................................................................. 13 2.8.2 试验结果................................................................................................................. 14 2.9 机械冲击 (IEC 61300-2-12)............................................................................................... 15 2.9.1 试验方法................................................................................................................. 15 2.9.2 试验结果................................................................................................................. 16 2.10 扭转试验 (IEC 61300-2-5)............................................................................................. 16 2.10.1 试验方法............................................................................................................... 16 2.10.2 试验结果............................................................................................................... 17 2.11 侧向静负载（侧拉） (IEC 61300-2-42)......................................................................... 18 2.11.1 试验方法............................................................................................................... 18 2.11.2 试验结果............................................................................................................... 19 2.12 光器件应力缓释抗弯性能实验(IEC 61300-2-44)........................................................... 20 2.12.1 试验方法............................................................................................................... 20 2.12.2 试验结果............................................................................................................... 21

峰峰值杂音测量方法介绍

峰峰值杂音测量方法介绍
1,双绞线法 2,平行线法 3,直接端电压峰峰值的测量效果,所以邮标YD/T732-94规定了300mm长的距离,双绞线的作用是抑制供电电源的共模干扰,避免共模干扰影响输出电压峰峰值的测量效果. 模块电源通常被看作是一个元件(而不是一个设备),外加输入输出滤波电容是必不可少的,这也是模块电源的结构特点所决定的,外加一个较大容量的电容很容易,但内加一个同容量的电容却相当困难.外加47μF的电解电容就是这样的作用,这也要求一般模块电源外加输出电容的容量不能小于 47μF.
此测量方法缺点是: (1)没有规定双绞线到底双绞多少圈(在工艺上,一般规定1m线长均匀绕多少次). (2)47μF的电解电容没有具体的型号或参数要求,这样选用高频性能好的和ESR小的电容,测量的峰峰值就小些. (3)在部件设计中,实际PCB板布局不可能是这样的.这样在部件中(也就是实际环境中),测量的峰峰值肯定比我们单模块测量要大.
平行线法
注意: C1:高频电容,容量1uF . C2:钽电容,容量10uF . 两条平行铜箔带的间距为2.54mm(0.1in.) 两平行铜箔带的电压降之和应小于输出电压值的2%.
平行线测量法的优点是与实际工作环境比较接近.
直接端子法
这种测试如果稍有不慎(如接触不太好,过于用力而折断示波器探头),测量结果就会偏大. 大批量生产测试工装制作麻烦,特别是两个输出引脚相距较远的模块或者两个输出引脚中间还有其它功能针脚的模块就容易引进干扰(这时要外加自制地线套). 在实验室或样机测试中可以采用此法.
同轴电缆法
同轴电缆法两种方法: 1,源端法 2,末端法
末端法有功率损耗 ,可见对高压输出的模块不宜采用末端法 . 源端法对峰峰值的测量准确,对外界的抗骚扰能力强.