XL4015

Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Features General Description n n n n n n n n n n n n n 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. Wide 8V to 36V Input Voltage Range Output Adjustable from 1.25V to 32V Maximum Duty Cycle 100% Minimum Drop Out 0.3V Fixed 180KHz Switching Frequency 5A Constant Output Current Capability Internal Optimize Power MOSFET High efficiency up to 96% Excellent line and load regulation Built in thermal shutdown function Built in current limit function Built in output short protection function Available in TO263-5L package 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. Applications n n n LCD Monitor and LCD TV Portable instrument power supply Telecom / Networking Equipment Figure1. Package Type of XL4015 Rev 1.3 www.xlsemi.com 1 Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Pin Configurations Figure2. Pin Configuration of XL4015 (Top View) Table 1 Pin Description Pin Number Pin Name 1 GND 2 FB 3 SW 4 VC 5 VIN Description 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. Feedback Pin (FB). Through an external resistor divider network, FB senses the output voltage and regulates it. The feedback threshold voltage is 1.25V. Power Switch Output Pin (SW). SW is the switch node that supplies power to the output. Internal Voltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uf capacity to VIN. Supply Voltage 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. Rev 1.3 www.xlsemi.com 2 Datasheet 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) Rev 1.3 www.xlsemi.com 3 Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Ordering Information Order Information XL4015E1 Marking ID XL4015E1 Package Type TO263-5L Packing Type Supplied As 800 Units on Tape & Reel XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant. Absolute Maximum Ratings（Note1） Parameter Symbol Vin VFB VOutput PD Value -0.3 to 40 -0.3 to Vin -0.3 to Vin Internally limited Unit V V V mW Input Voltage Feedback Pin Voltage Output Switch Pin Voltage Power Dissipation Thermal Resistance (TO263-5L) (Junction to Ambient, No Heatsink, Free Air) Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) ESD (HBM) RJA 30 ºC/W TJ TSTG TLEAD -40 to 125 -65 to 150 260 >2000 ºC ºC ºC V 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. Rev 1.3 www.xlsemi.com 4 Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 XL4015 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit 1.225 1.25 1.275 V - 87 - % - 93 - % System parameters test circuit figure4 Feedback Voltage VFB Efficiency ŋ Efficiency ŋ Vin = 8V to 40V, Vout=5V Iload=0.5A to 5A Vin=12V ,Vout=5V Iout=5A Vin=24V ,Vout=12V Iout=4A Electrical Characteristics (DC Parameters) Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, Ta = 25℃; the others floating unless otherwise specified. Parameters Input operation voltage Quiescent Supply Current Symbol Vin Fosc Output Short Frequency Fosp Min. Typ. Max. Unit 36 V 2.1 5 mA 180 216 KHz 8 Iq Oscillator Frequency Switch Current Limit Test Condition VFB =Vin 144 48 KHz IL VFB =0 7 A Max. Duty Cycle DMAX VFB=0V 100 % Output Power PMOS Rdson VFB=0V, Vin=12V, ISW=5A 60 Rev 1.3 80 mohm www.xlsemi.com 5 Datasheet 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) Efficiency VS Output current 100 95 90 Efficiency(%) 85 80 75 VIN=8V,VOUT=5V,IOUT=0.1A~5A VIN=12V,VOUT=5V,IOUT=0.1A~5A VIN=24V,VOUT=5V,IOUT=0.1A~5A VIN=36V,VOUT=5V,IOUT=0.1A~5A 70 65 60 55 50 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Load current(A) Figure6. XL4015 System Efficiency Curve Rev 1.3 www.xlsemi.com 6 Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Typical System Application (VOUT=12V/4A) Figure7. XL4015 System Parameters Test Circuit (VIN=15V~36V, VOUT=12V/4A) Efficiency VS Output current 100 95 90 Efficiency(%) 85 80 VIN=15V,VOUT=12V,IOUT=0.1A~4A VIN=24V,VOUT=12V,IOUT=0.1A~4A VIN=36V,VOUT=12V,IOUT=0.1A~4A 75 70 65 60 55 50 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Output current(A) Figure8. XL4015 System Efficiency Curve Rev 1.3 www.xlsemi.com 7 Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Typical System Application (TTL shutdown function) Logic level signals shutdown function can be used in typical system application with external components. When the TTL high voltage above 3.3V(referenced to ground, lower than VIN), the converter will shutdown, input current less than 5mA; when the TTL Low voltage below 0.8V(referenced to ground), the converter will turn on. L1 47uH/5A VIN 5 VC CIN 220uF/50V C1 105 4 1 GND VOUT=1.25*(1+R2/R1) SW D1 B540 XL4015 CC 105 VIN 3 2 FB R3 10K C2 105 COUT 330uF/25V R2 10K D2 1N4148 OFF(High>3.3V) R1 3.3K ON(Low