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LM25088发热严重

Other Parts Discussed in Thread: LM25088

最近项目中用到LM25088做一个24v转12v10a的电源,发现LM25088在输入电压为16v是还不是很热,但工作在24v输入时不管是空载还是带负载都会发热严重,手指放在芯片上5秒钟就会感觉烫手,原理图如下

下面是示波器测量SW脚的波形