5A 180KHz 36V Buck DC to DC Converter XL4015
Features
n Wide 8V to 36V Input Voltage Range n Output Adjustable from 1.25V to 32V n Maximum Duty Cycle 100% n Minimum Drop Out 0.3V
n Fixed 180KHz Switching Frequency n 5A Constant Output Current Capability n Internal Optimize Power MOSFET
n High efficiency up to 96%
n Excellent line and load regulation n Built in thermal shutdown function n Built in current limit function
n Built in output short protection function n Available in TO263-5L package
Applications
n LCD Monitor and LCD TV
n Portable instrument power supply n Telecom / Networking Equipment
General Description
The XL4015 is a 180 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 5A 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 over current protection function is built inside. When short protection function happens, the operation frequency will be reduced from 180KHz to 48KHz. An internal compensation block is built in to minimize external component count.
Figure1. Package Type of XL4015
5A 180KHz 36V Buck DC to DC Converter
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XL4015
Pin Configurations
Figure2. Pin Configuration of XL4015 (Top View) Table 1 Pin Description
Pin Number Pin Name Description
1 GND Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL4015.
2 FB Feedback Pin (FB). Through an external resistor divider network, FB senses the output voltage and regulates it. The feedback threshold voltage is 1.25V.
3 SW Power Switch Output Pin (SW). SW is the switch node that supplies power to the output.
4 VC Internal V oltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uf capacity to VIN.
5 VIN Supply V oltage Input Pin. XL4015 operates from a 8V to 36V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.
5A 180KHz 36V Buck DC to DC Converter XL4015 Function Block
Figure3. Function Block Diagram of XL4015
Typical Application Circuit
Figure4. XL4015 Typical Application Circuit (VIN=8V~36V, VOUT=5V/5A)
5A 180KHz 36V Buck DC to DC Converter XL4015 Ordering Information
Order Information Marking ID Package Type Packing Type Supplied As
XL4015E1 XL4015E1 TO263-5L 800 Units on Tape & Reel
Absolute Maximum Ratings（Note1）
Parameter Symbol Value Unit Input Voltage Vin -0.3 to 40 V Feedback Pin Voltage V FB-0.3 to Vin V Output Switch Pin Voltage V Output-0.3 to Vin V Power Dissipation P D Internally limited mW Thermal Resistance (TO263-5L)
R JA30 ºC/W (Junction to Ambient, No Heatsink, Free Air)
Operating Junction Temperature T J-40 to 125 ºC Storage Temperature T STG-65 to 150 ºC Lead Temperature (Soldering, 10 sec) T LEAD260 ºC ESD (HBM) >2000 V Note1: Stresses greater than t
近海风荷载hose 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.
5A 180KHz 36V Buck DC to DC Converter XL4015 XL4015 Electrical Characteristics
T a = 25℃;unless otherwise specified.
Symbol Parameter Test Condition Min. Typ. Max. Unit System parameters test circuit figure4
VFB Feedback
V oltage
Vin = 8V to 40V, V out=5V
Iload=0.5A to 5A
1.225 1.25 1.275 V
Efficiency ŋVin=12V ,V out=5V
Iout=5A
- 87 - %
Efficiency ŋVin=24V ,V out=12V
Iout=4A
- 93 - %
Electrical Characteristics (DC Parameters)
Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, T a = 25℃; the others floating unless otherwise specified.
Parameters Symbol Test Condition Min. Typ. Max. Unit Input operation voltage Vin 8 36 V Quiescent Supply Current I q V FB =Vin 2.1 5 mA Oscillator Frequency Fosc 144 180 216 KHz Output Short Frequency Fosp 48 KHz Switch Current Limit I L V FB =0 7 A Max. Duty Cycle D MAX V FB=0V 100 %
Output Power PMOS Rdson V FB=0V, Vin=12V,
60 80 mohm
5A 180KHz 36V Buck DC to DC Converter
XL4015
Typical System Application (VOUT=5V/5A)
Figure5. XL4015 System Parameters Test Circuit (VIN=8V~36V, VOUT=5V/5A)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
吴登昌4.0
4.5
5.0胡佩莲
5055606570758085
9095
100
Efficiency VS Output current
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E f f i c i e n c y (%)
Load current(A)
Figure6. XL4015 System Efficiency Curve
