基于AP3772的反激變換器的設計

摘要：本文闡釋了原邊控制在反激變換器中應用的優點；介紹一款原邊控制型電源管理芯片——AP3772，解釋其實現恒壓輸出、恒流輸出的工作原理，并對恒流模式的線補償電路做出分析；最后設計了一款基于AP3772的5W反激變換器，對該變換器進行測試，測試結果達到了設計要求。 敘詞：AP3772 原邊控制 反激變換器 線補償 Abstract：The paper expounded the advantages of Primary 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. Keyword：AP3772, Primary side regulation, Fly-back converter, Line compensation