学习COT原理，设计制做调式PL56002数控CV/CC同步Buck电路，打样铝合金外壳 ...

heisechong

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简单介绍了COT原理，并设计、制做、调试PL56002数控 CV/CC同步Buck电路，又在立创免费打样了铝合金外壳，为以后做功能相对完善的数控电源做准备。一定会有人说，网售现成的数控电源便宜的才六七十块钱，没必要自己做。究竟有没有必要因人而异不能强求，你喜欢就有必要，不喜欢就没必要。觉得没必要的可以止步于此，免得彼此扫兴。觉得有必要的请继续往下看，我举双手欢迎。

一、发现PL56002

五六年前对数控电源比较感兴趣，先后制做了几个数控电源。那时候对开关电源了解还不多，就想找个集成度尽量高的芯片，集成CV/CC控制并且外置基准最好了，这样MCU只需要输出两路DAC或PWM信号，分别做为CV和CC的基准就可以了。可是找了一圈也没找到，只能自己搭电路。先是用LM2596做了两款，功率偏小不说，过冲也不好控制。后来又基于TL494做了一款，效果还可以，只是元件多，环路补偿计算也比较复杂。

前阵子网上闲逛的时候找到了一款集成度很高，且适合做数控电源的芯片PL56002（其实最开始找到的是PL56001，联系厂家后被告之停产了），又有了再做个数控电源玩玩的想法。由于这款芯片不像LM2596、TL494那样经典，好多人可能没怎么接触过，所以先简单介绍一下。

二、PL56002简介

PL56002是一款固定导通时间（即Constant On Time，缩写COT）同步Buck控制器，内部集成CV/CC控制电路，输出电压3~32V，输出电压2~32V。开关频率分150kHz、300KHz、600kHz、1.2MHz四档。集成了自举NMOS驱动电路，驱动峰值电流2A左右。同时也集成了短路保护、过压保护等功能。3x3 20脚QFN封装。下图为应用示意图