基于BCD公司的AP系列芯片，本文介绍一种以最少外部元器件就能获得高效率的高频开关电源的设计方法，该电路在宽范围电压输入范围内，采取单端反激式电路，利用光耦反馈和脉冲宽度调制技术来实现横流稳压输出。-Based BCD company s AP series chip, this paper introduce a minimum of external components to get the high-efficiency high-frequency switching power’ design method, the circuit in the wide voltage input range, also take single-ended flyback circuit, the use optocoupler feedback and pulse width modulation technology to achieve regular output.