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LM25118使用发热问题

Other Parts Discussed in Thread: LM25118

最近使用LM25118做了一个12V转24V,600mA的电路,负载很小,但是芯片烫的厉害,用手摸不得。有时候芯片还会被烧坏,没有输出,重新上电也没有输出。请教是什么原因。