Fairchild FSQ500L 5.1V/400mA紧凑型省电模式反激式设计

Fairchild公司的FSQ500L主要为替代线性供电电源而设计的低价格产品。芯片集成SenseFET的电流模式PWM，内建PWM控制器主要有以下特性：内置振荡器、欠压锁定保护、过载保护、内置前沿消隐电路、优化的门驱动开/关、磁滞热关断保护和温度补偿精密电流源。本文主要介绍FSQ500L的主要特性及器件框图，同时介绍一款基于FSQ500L芯片的2.04W输出的供电电源开发方案。主要介绍方案的主要特性、性能、方案原理图、方案PCB图及方案器件列表。

The FSQ500L is specially designed for a replacement of linear power supplies with low cost. This device combines current-mode Pulse Width Modulator (PWM) with a senseFET. The integrated PWM controller features include: a fixed oscillator, Under Voltage Lockout (UVLO) protection, Overload Protection (OLP), Leading-Edge Blanking (LEB), an optimized gate turn-on/turn-off driver, Thermal Shutdown (TSD) protection with hysteresis, and temperature-compensated precision-current sources for loop compensation. When compared to a linear power supply, the FSQ500L device reduces total size and weight, while increasing efficiency, productivity, and system reliability. This device provides a basic platform for cost-effective flyback converters.

FSQ500L主要特性：

Single Chip 700V SenseFET Power Switch

Precision Fixed Operating Frequency: 130kHz
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