原标题：Fairchild FSGM0565离线电源设计方案

　　Fairchild 公司的FSGM0565是集成了SenseFET的PWM控制器,特别设计用于离线开关电源(SMPS),最大限度降低外接元件数量. PWM控制器包括固定频率振荡器,UVLO, 前沿消隐(LEB),优化栅极驱动器,软起动,用于回路补偿的温度补偿精密电流源,以及自保护低矮路.内部的高压SenseFET可达650V,主要用在LCD TV和监视器,STB和DVD的电源.本文介绍FSGM0565主要特性,方框图, PWM电路图,典型应用电路, 演示板电路图和所用材料清单(BOM).

　　Fairchild Semiconductor’s Power Switch Improves Off-Line Power Supply Designs

　　The FSGM0565R is an integrated Pulse Width Modulation (PWM) controller and SenseFET specifically designed for offline Switch-Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry. Compared with a discrete MOSFET and PWM controller solution, the FSGM series can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform suited for cost-effective design of a flyback converter.

　　FSGM0565主要特性:

　　Soft Burst-Mode Operation for Low Standby Power Consumption and Low Noise

　　Precision Fixed Operating Frequency: 66kHz

　　Pulse-by-Pulse Current Limit

　　Various Protection Functions: Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis, Output Short Protection (OSP), and Under-Voltage Lockout (UVLO) with Hysteresis

　　Auto-Restart Mode

　　Internal Startup Circuit

　　Internal High-Voltage SenseFET: 650V

　　Built-in Soft-Start: 15ms

　　FSGM0565应用:

　　Power Supply for LCD TV and Monitor, STB and DVD Combination

　　图1.FSGM0565内部方框图

　　图2.FSGM0565 PWM电路图

　　图3.FSGM0565典型应用电路图

　　图4.反常过流保护

　　图5.FSGM0565演示板电路图

　　图6.FSGM0565演示板变压器电路

　　FSGM0565演示板材料清单(BOM):