【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

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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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必易微（KIWI）AC-DC反激控制器选型表

目录- PSR 控制器 PSR 功率开关 SSR 控制器 SSR 功率开关

型号- KP2190,KP23223,KP23223M,KP2192,KP2264H,KP206A,DSEK60-02A,KP206B,KP36374,KP36373,KP2066,KP2064,DSI45-16A,KP22308A,KP22066A,KP2182,KP2062,DPG80C300HB,KP21822M,KP2202A,KP22308,KP22306,DSSK30-018A,KP23132M,DPG30C200HB,KP23132K,DSSK50-01A,KP2262H,KP23161,KP23160,KP2205,KP2206,KP2203,DSA70C150HB,KP21827,KP2164,KP21824,DSSK60-015A,KP2165,KP2162,KP21823,KP2201,DSS60-0045B,KP2202,KP2166,DSP25-16A,DSA30C100HB,KP2161,DPG30I400HA,KP2166M,KP201,DSSK80-0008D,DHG30I600HA,KP206,DSDI60-16A,KP23225C,KP22315A,KP21824M,KP21824L,KP23267,KP23162M,DH60-18A,KP21825C,KP23162K,DSA60C60HB,DSP45-16A,DSSK80-003B,DSEP60-12A,DSEC60-06A,KP36572,KP2264,KP2261,KP2262,DSEI120-12A,DPG80C400HB,KP36674P,KP201F,KP22066,KP22064,KP23151,KP22062,KP201A,DH40-18A,KP22305L,KP201E,KP201B,KP22062A,KP201C,DSDI60-18A,KP2206A,KP2011,KP22305A,KP2012,DMA50P1600HB,KP2013,KP2161M,KP22035,KP23152M,DPG30C300HB,DSSK70-008A,DSA70C200HB,KP36675,KP36674,KP36673,DSSK60-02A,DSSK80-0045B,KP22306A,DSEC60-12A,DSEP30-12A,KP21827M,DSEP30-12B,DSEI120-06A,KP2162M,DSA50C100HB,KP23132,KP23131,KP23130,KP2190B,DH20-18A,DSEI60-02A,DSSK80-006B