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LM5166电感啸叫

Other Parts Discussed in Thread: LM5166

使用推荐的电路,在工作状态(较高输出电流40mA左右时)产生刺刺声,平时(较低电流几个mA)也有杂声,但声音较小。是什么原因呢,对电路长期工作有什么影响?附件是电路原理图。

10V.pdf