[原创] Diodes AP3984高效率高性能开关电源解决方案

Diodes公司的AP3984是具有更好转换效率,更高电压和电流精度和更好保护功能的开关电源控制器,内置了700V BJT,初级边控制省略了光耦器件,具有极好的瞬态特性,高压和超速起动,外接可调节输出电缆压降补偿,无负载功耗小于10mW,多种PWM/PFM模式改善了音频噪音和效率,主要用在充电器,ADSL适配器,家用电器和机顶盒以及PC辅助电源.本文介绍了AP3984主要特性,框图,应用电路以及极低待机功耗PSR开关的评估板AP3984 5V 1A EV1主要特性和指标,测试结果,电路图,材料清单和PCB设计图.

The AP3984 is a power switcher for power supplies with better conversion efficiency, better voltage & current accuracy, and improved protection functions. Typical applications include charger, adapter for ADSL, home appliance power supply and PC auxiliary power supplies. The AP3984 with built in BJT, regulates the output voltage and current in the primary side by piece-wise pulse frequency modulation (p-PFM) and primary current peak amplitude modulation (AM) in discontinuous conduction mode (DCM). The system operating frequency reduces linearly from heavy load to light load in each interval of the p-PFM, and operating frequency is fixed at medium load by varying primary current peak amplitude.

The AP3984 has good transient characteristics in combination with the secondary side IC like AP4341/AP43410. Typically, minimal voltage of 4.3V at PCB side can be achieved for dynamic test of 5V application system. ..

查看全文