HM3103 Datasheet | H&M Semiconductor

4A 180KHz 36V Buck DC to DC Converter 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 4A Constant Output Current Capability n Internal Optimize Power MOSFET n High efficiency 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 TO-252 package Applications n LCD Monitor and LCD TV n Portable instrument power supply n Tele / Networking Equipment General Description The HM3103 is a 180 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 4A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external ponents, the regulator is simple to use and include internal frequency pensation 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 pensation block is built in to minimize external ponent count. Figure1. Package Type of HM3103 Rev 1.3 Shenzhen H&M Semiconductor Co.Ltd http：//.hmsemi. 4A 180KHz 36V Buck DC to DC Converter Pin Configurations Figure2. Pin Configuration of HM3103 (Top View) Table 1 Pin Description Pin Number 1 2 3 4 5 Pin Name GND FB SW VC 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 HM3103. 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...