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TPS23753A 芯片有响声

Other Parts Discussed in Thread: TPS23753A

Hi ,

我参数demo板设计一款基于TPS23753A的12V输出,现在电源12V输出正常,但TPS23753A这颗IC一直发出叽叽的响声,

是哪里原因导致呢?原理图如附件,

另外我量CTL pin脚波形如下,这个波形对吗?不应该恒定高或者低吗?