XL4015降压型直流电源变换器芯片(大功率型)

Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Rev 1.3 1 Features n Wide 8V to 36V 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 Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Rev 1.3 2 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 Voltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uf capacity to VIN. 5 VIN Supply Voltage Pin. XL4015 operates from a 8V to 36V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the . Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Rev 1.3 3 Function Block Figure3. Function Block Diagram of XL4015 Typical Application Circuit Figure4. XL4015 Typical Application Circuit VIN8V36V, VOUT5V/5A Datasheet 5A 180KHz 36V Buck DC to DC Converter XL4015 Rev 1.3 4 Ordering Ination Order Ination Marking ID Package Type Packing Type Supplied As XL4015E1 XL4015E1 TO263-5L 800 Units on Tape unless otherwise specified. Symbol Parameter Test Condi