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LM25118MOS上管工作不正常

   设计是参考webench设计,输入11-24VDC,输出13V/3A。

下官工作正常,11-15V输入基本都能工作,但是输入大于15V就不正常。

下面图形1、原理图;2、12V输入,13V输出上管HO波形;3、12V输入,13V输出上管LO波形,4、16V输入,上管HO波形。