【应用】国产PWM控制功率开关芯片KP35026应用于LED灯带调光，开关频率可达45kHz

时间： 2022-09-14 来源：世强

技术问答

随着科技的不断发展进步，在我们日常生活中能体会到越来越多的独特而美好的氛围场景，各种氛围的灯光设计都需要用到灯带，而LED灯带在我们生活中也随处可见。某客户设计一款LED灯带调光器，直接交流220V的市电输入，经过整流电路后，然后到开关控制电路，通过开关控制电路对LED灯带进行控制。经过我司选型推荐客户在开关控制电路部分采用了国产必易微的PWM控制功率开关 KP35026，这款芯片与与传统的PWM控制芯片有所差异，它的内部无固定时钟驱动MOSFET，系统开关频率随负载变化可实现自动调节，并且开关频率可达45KHz，能完全满足客户使用需求，如下图为必易微的PWM控制功率开关KP35026的应用框图：

PWM控制功率开关KP35026应用框图

客户采用了必易微的PWM控制功率开关芯片KP35026，具有以下特点：

（1）芯片内部集成了500V高压MOSFET，可提高系统浪涌耐受能力；

（2）开关频率最高可达45kHz，内部无固定时钟驱动MOSFET，系统开关频率随负载变化可实现自动调节；

（3）该芯片采用了多模式PWM控制技术和动态响应优化电路，可以一高动态响应能力以及降低系统的噪声；

（4）空载待机功耗可做到低于20mW，更节省资源；

（5）该芯片支持降压和升降压拓扑，可供客户作更多设计选择。

综上所述，在该客户的方案设计中，考虑到客户开关工作频率以及快速动态响应的要求，结合到该芯片已经在市场上也经过了长期的验证，性能、功能等方面都较为出色，选用必易微的PWM控制功率开关KP35026是一个和理想的设计与选择。

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选型指南 - 必易微 - REV 1.1 - 2023/6/1 PDF 中文下载

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