前段时间用TPS54340做了个电路，30V输入，20V2.5A输出，结果一会正常，一会又没有输出了，用示波器点4脚，有滋滋的响声（估计是电感吧），这样就有输出了，探头离开后又没有输出了，好像是不起振，有哪位遇到过吗？
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