XL2576降压型直流电源变换器芯片(常规型)
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Hz 40V Buck DC to DC Converter Function Block XL2576
Figure3. Function Block Diagram of XL2576
Typical Application Circuit
Figure4. XL2576 Typical Application Circuit 12V-5V/3A
XL2576
System parameters test circuit figure6 VOUT Efficiency Output Voltage Vin = 4.75V to 40V Iload=0.2A to 3A Vin=12V ,Vout=3.3V Iout=3A 3.168 3.3 75 3.432 V %
Fixed 52KHz Switching Frequency 3A Constant Output Current Capability Internal Optimize Power Transistor High efficiency
Excellent line and load regulation TTL shutdown capability ON/OFF pin with hysteresis function
4
Datasheet 3A 52KHz 40V Buck DC to DC Converter Absolute Maximum Ratings（Note1）
Parameter Input Voltage Feedback Pin Voltage ON/OFF Pin Voltage Output Switch Pin Voltage Power Dissipation Thermal Resistance (TO220 & TO263) (Junction to Ambient, No Heatsink, Free Air) Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) ESD (HBM) Symbol Vin VFB VON/OFF VOutput PD RJA TJ TSTG TLEAD Value -0.3 to 45 -0.3 to Vin -0.3 to Vin -0.3 to Vin Internally limited 30 -40 to 125 -65 to 150 260 >2000 Unit V V V V mW ºC/W ºC ºC ºC V
3
Datasheet 3A 52KHz 40V Buck DC to DC Converter Ordering Information XL2576 E1
E1: Lead Free Circuit Type
XL2576
Package S: TO263-5L T: TO220-5L
Version ADJ: Adjust 3.3: 3.3V 5.0: 5V 12: 12V
ŋ
XL2576-5.0 Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure7 VOUT Efficiency Output Voltage Vin = 7V to 40V Iload=0.2A to 3A Vin=12V ,Vout=5V Iout=3A 4.8 5 78 5.2 V %
Figure1. Package Type of XL2576
1
Datasheet 3A 52KHz 40V Buck DC to DC Converter Pin Configurations XL2576
Figure2. Pin Configuration of XL2576 (Top View) Table 1 Pin Description Pin Number 1 2 3 Description Supply Voltage Input Pin. XL2576 operates from a 4.5V to VIN 40V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input. Power Switch Output Pin (SW). Output is the switch node that OUTPUT supplies power to the output. Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor GND ground path to prevent switching current spikes from inducing voltage noise into XL2576. Feedback Pin (FB). Through an external resistor divider FEEDBACK network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 1.23V. Enable Pin. Drive ON/OFF pin low to turn on the device, drive ON/OFF it high to turn it off. Floating is default low. Pin Name
XL2576
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
ŋ
XL2576-ADJ Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure8 VOUT Efficiency Output Voltage Vin = 4.5V to 40V Iload=0.2A to 3A Vin=12V ,Vout=3V Iout=3A 1.193 1.23 73 1.267 V %
5
Datasheet 3A 52KHz 40V Buck DC to DC Converter XL2576-3.3 Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
Packing Type Supplied As Tube Tube Tube Tube 800 Units on Tape & Reel 800 Units on Tape & Reel 800 Units on Tape & Reel 800 Units on Tape & Reel
XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.
ŋ
XL2576-12 Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure5 VOUT Efficiency Output Voltage Vin = 15V to 40V Iload=0.2A to 2A Vin=24V ,Vout=12V Iout=2A 11.52 12 92 12.48 V %
Built in thermal shutdown function Built in current limit function Available in TO-220,TO-263 packages
Applications
LCD Monitor and LCD TV Digital Photo Frame Set-up Box ADSL Modem Telecom / Networking Equipment
Wide 4.5V to 40V Input Voltage Range 3.3V,5V,12V and adjustable versions Output Adjustable from 1.23V to 37V
Maximum Duty Cycle 100% Minimum Drop Out 1.5V
Package
Temperature Range -40oC ~ 85oC
TO220-5L
TO263-5L
-40oC ~ 85oC
Marking ID Lead Free XL2576T-ADJE1 XL2576T-3.3E1 XL2576T-5.0E1 XL2576T-12E1 XL2576S-ADJE1 XL2576S-3.3E1 XL2576S-5.0E1 XL2576S-12E1
Datasheet 3A 52KHz 40V Buck DC to DC Converter Features
XL2576 General Description
The XL2576 is a 52 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 3A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator. The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An enable function, an over current protection function is built inside. An internal compensation block is built in to minimize external component count.
Figure3. Function Block Diagram of XL2576
Typical Application Circuit
Figure4. XL2576 Typical Application Circuit 12V-5V/3A
XL2576
System parameters test circuit figure6 VOUT Efficiency Output Voltage Vin = 4.75V to 40V Iload=0.2A to 3A Vin=12V ,Vout=3.3V Iout=3A 3.168 3.3 75 3.432 V %
Fixed 52KHz Switching Frequency 3A Constant Output Current Capability Internal Optimize Power Transistor High efficiency
Excellent line and load regulation TTL shutdown capability ON/OFF pin with hysteresis function
4
Datasheet 3A 52KHz 40V Buck DC to DC Converter Absolute Maximum Ratings（Note1）
Parameter Input Voltage Feedback Pin Voltage ON/OFF Pin Voltage Output Switch Pin Voltage Power Dissipation Thermal Resistance (TO220 & TO263) (Junction to Ambient, No Heatsink, Free Air) Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) ESD (HBM) Symbol Vin VFB VON/OFF VOutput PD RJA TJ TSTG TLEAD Value -0.3 to 45 -0.3 to Vin -0.3 to Vin -0.3 to Vin Internally limited 30 -40 to 125 -65 to 150 260 >2000 Unit V V V V mW ºC/W ºC ºC ºC V
3
Datasheet 3A 52KHz 40V Buck DC to DC Converter Ordering Information XL2576 E1
E1: Lead Free Circuit Type
XL2576
Package S: TO263-5L T: TO220-5L
Version ADJ: Adjust 3.3: 3.3V 5.0: 5V 12: 12V
ŋ
XL2576-5.0 Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure7 VOUT Efficiency Output Voltage Vin = 7V to 40V Iload=0.2A to 3A Vin=12V ,Vout=5V Iout=3A 4.8 5 78 5.2 V %
Figure1. Package Type of XL2576
1
Datasheet 3A 52KHz 40V Buck DC to DC Converter Pin Configurations XL2576
Figure2. Pin Configuration of XL2576 (Top View) Table 1 Pin Description Pin Number 1 2 3 Description Supply Voltage Input Pin. XL2576 operates from a 4.5V to VIN 40V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input. Power Switch Output Pin (SW). Output is the switch node that OUTPUT supplies power to the output. Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor GND ground path to prevent switching current spikes from inducing voltage noise into XL2576. Feedback Pin (FB). Through an external resistor divider FEEDBACK network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 1.23V. Enable Pin. Drive ON/OFF pin low to turn on the device, drive ON/OFF it high to turn it off. Floating is default low. Pin Name
XL2576
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
ŋ
XL2576-ADJ Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure8 VOUT Efficiency Output Voltage Vin = 4.5V to 40V Iload=0.2A to 3A Vin=12V ,Vout=3V Iout=3A 1.193 1.23 73 1.267 V %
5
Datasheet 3A 52KHz 40V Buck DC to DC Converter XL2576-3.3 Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
Packing Type Supplied As Tube Tube Tube Tube 800 Units on Tape & Reel 800 Units on Tape & Reel 800 Units on Tape & Reel 800 Units on Tape & Reel
XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.
ŋ
XL2576-12 Electrical Characteristics
Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit
System parameters test circuit figure5 VOUT Efficiency Output Voltage Vin = 15V to 40V Iload=0.2A to 2A Vin=24V ,Vout=12V Iout=2A 11.52 12 92 12.48 V %
Built in thermal shutdown function Built in current limit function Available in TO-220,TO-263 packages
Applications
LCD Monitor and LCD TV Digital Photo Frame Set-up Box ADSL Modem Telecom / Networking Equipment
Wide 4.5V to 40V Input Voltage Range 3.3V,5V,12V and adjustable versions Output Adjustable from 1.23V to 37V
Maximum Duty Cycle 100% Minimum Drop Out 1.5V
Package
Temperature Range -40oC ~ 85oC
TO220-5L
TO263-5L
-40oC ~ 85oC
Marking ID Lead Free XL2576T-ADJE1 XL2576T-3.3E1 XL2576T-5.0E1 XL2576T-12E1 XL2576S-ADJE1 XL2576S-3.3E1 XL2576S-5.0E1 XL2576S-12E1
Datasheet 3A 52KHz 40V Buck DC to DC Converter Features
XL2576 General Description
The XL2576 is a 52 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 3A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator. The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An enable function, an over current protection function is built inside. An internal compensation block is built in to minimize external component count.