【应用】智能插座电源设计推荐国产超低功耗非隔离PWM功率开关KP3110，集成500V高压MOS

时间： 2021-04-11 来源：世强

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智能插座属于新兴的电气产品，主要作用是节约电量，还可以通过WIFI、蓝牙等与手机APP连接进行远端控制，其中内部器件电源一般采用5V供电，需要AD-DC器件将交流220V转为直流5V。

针对市电220V交流转换成直流5V的应用，推荐必易微电子的非隔离PWM功率开关 KP3110，默认输出高精度5V直流电压，内部集成500V高压MOSFET和高压启动电路，同时集成31KHz带抖频功能振荡器，以下是KP3110的典型电器参数。

智能插座的电源输入端都是采用市电220V交流，内部模块供电一般都是5V，KP3110可以输出高精度5V直流电压，满足智能插座内部电源设计需求。传统的AC-DC控制器件的MOSFET都是外置，占用PCB面积较大，KP3110集成500V MOSFET，外围只需要简单电路即可实现AC-DC功能，减小PCB面积。该器件内部集成31KHz频率振荡器且带有抖频功能，在输出功率不变的前提下，优化EMI效果，保证产品稳定性。KP3110提供轻重载模式，待机功耗低至50mW，提高产品工作效率；超低待机功耗降低了VDD电容需求，采用普通0.1-1uF陶瓷电容即可，降低系统BOM成本，典型封装和应用电路如下。

图1 KP3110的典型应用电路和封装

综上所述，必易微电子的PWM控制开关KP3110，具有50wW的超低待机功耗、集成高压MOSFET、输出高精度5V直流、小尺寸封装的特性，是智能插座等小家电内部AC-DC电源设计的优秀解决方案。

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