【应用】国产低功耗ACDC电源芯片KP216X助力反激电源快速启动，仅耗时23.6ms

时间： 2020-12-17 来源：世强

技术问答

在日常电路设计中都需要用到辅助电源，反激拓扑的辅助电源由于其输入电压范围广，电路简单、成本低廉、容易设计制作等特点，收到越来越多的工程师青睐，本文将结合必易微电子的高压启动ACDC电源芯片 KP216X，介绍其在反激电源应用中的优势。

如图1所示，是基于必易微KP216X的高压启动典型电路和基于KP212X的低压启动典型电路对比图，可以看出，基于高压启动电路的反激电源在电路上少了一个启动电阻，外围电路简单；同时由于没用启动电阻，也就不存在电阻损耗，降低了待机功耗。

图1 高压启动和低压启动ACDC电源典型电路对比示意图

KP2162和KP2122在实际反激电源应用中，其启动时间的波形对比示意图如图2所示，从波形图我们可以看出，基于KP2162的高压启动反激电源在启动时间上仅为23.6ms，而常规的启动时间在1.6s。因此在有些要求快速启动的产品上选用高压启动的KP216X系列作为辅助电源ACDC芯片就非常合适。

图2 KP2162和KP2122启动时间对比事宜图

综上所述，基于高压启动ACDC电源芯片KP216X的应用优势如下：

1、电路无需启动电阻，外围电路简单，同时可以节约成本；

2、由于不用启动电阻，就不存在启动电阻损耗，可以节约10-15mW的功耗，待机损耗低；

3、快速的动态响应，大大缩短了芯片启动时间，实现了反激辅助电源的快速启动；

4、国产品牌，性价比和交期优势明显；

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