基于OB2269的高精度笔记本电源适配器

设计基于OB2269的高精度笔记本电源适配器。功率电路采用反激式拓扑结构,电路的控制采用PFM型频率调制控制方式,辅助电源采用晶体管有源嵌位电路,输出电路采用变压器单路隔离输出,电压反馈电路采用光耦PC817和TL431的组合结构。测试结果表明:本电源适配器能输出19.3 V的稳定电压,功率可达100 W,效率高达78.8%,文波电压为100 m V。本电源适配器适用于75~285 V宽电压的交流输入,是一种成本低、维修简单的高性能开关电源。

A Design of OB2269-Based High-Precision PC Power Adapter

A high-precision PC power adopter based on PFM control chip OB2269 has been designed. The power adapter adopts the fly-back topology structure, with PFM control its frequency modulation control mode, with the transistor active block circuit its auxiliary supply, with the isolated single output its output circuit, and with the composite structure of PC817 and TL431its voltage feedback circuit. The test results show that the PC power adapter of this design can output the high-precision 19.3 V, with its the power up to 100 W, with its efficiency as high as 78.8%, and with its ripple voltage 100 mV. The PC power adapter, low in production cost, simple in maintenance but high in performance, can also find its application in 75~285 V AC input voltage.