DFR0205

Datasheet 5A 350KHz 25V Buck DC to DC Converter Features General Description Wide 3.6V to 25V Input Voltage Range The GS2678 is a 350 KHz fixed frequency Output Adjustable from 0.8V to 23V PWM buck (step-down) DC/DC converter, Maximum Duty Cycle 100% capable of driving a 5A load with high Minimum Drop Out 0.6V efficiency, low ripple and excellent line and Fixed 350KHz Switching Frequency load regulation. Requiring a minimum 5A Constant Output Current Capability number of external components, the regulator Internal Optimize Power MOSFET is simple to use and include internal High efficiency frequency compensation and a Excellent line and load regulation fixed-frequency oscillator. TTL shutdown capability EN pin with hysteresis function The PWM control circuit is able to adjust the Built in thermal shutdown function duty ratio linearly from 0 to 100%. An enable Built in current limit function function, an over current protection function Built in output short protection function is built inside. When short protection function Available in TO-263 package happens, the operation frequency will be reduced from 350KHz to 80KHz. An internal compensation block is built in to minimize Applications external component count. LCD Monitor and LCD TV Digital Photo Frame Set-up Box ADSL Modem Telecom / Networking Equipment Figure1. Package Type of GS2678 www.DataSheet4U.net SHENZHEN GSM ELECTAONIC CO.,LTD Datasheet 5A 350KHz 25V Buck DC to DC Converter Pin Configurations Figure2. Pin Configuration of GS2678 (Top View) Table 1 Pin Description Pin Number Pin Name Description Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor 1 GND ground path to prevent switching current spikes from inducing voltage noise into GS2678. Feedback Pin (FB). Through an external resistor divider 2 FB network, FB senses the output voltage and regulates it. The feedback threshold voltage is 0.8V. Power Switch Output Pin (SW). SW is the switch node that 3 SW supplies power to the output. Enable Pin. Drive EN pin high to turn on the device, drive it 4 EN low to turn it off. Floating is default high. Supply Voltage Input Pin. GS2678 operates from a 3.6V to 5 VIN 25V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input. SHENZHEN GSM ELECTAONIC CO.,LTD