基于AP3772的反激变换器的设计

Design of Fly-back Converter Based on AP3772

本文阐释了原边控制在反激变换器中应用的优点;介绍一款原边控制型电源管理芯片——AP3772,解释其实现恒压输出、恒流输出的工作原理,并对恒流模式的线补偿电路做出分析;最后设计了一款基于AP3772的5W反激变换器,对该变换器进行测试,测试结果达到了设计要求。

The paper expounded the advantages of Pri,nary Side Regulation （PSR） applied to the fly-back converter. A power supply controller based on PSR-AP3772 was introduced. Explicated the principles of the output power with constant voltage and constant current, and analyzed the line compensation used in the constant current mode. At last, designed and tested a 5W fly-back converter based on AP3772. with a result of the test satisfying the design requirements.