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TPS54622输出电压问题

Other Parts Discussed in Thread: TPS54622

使用TPS54622,输入是8.4V锂电池,输出5.2V,情况是:

本次做了5块样板,同一批次,只有其中一块可正常输出5.2V,其余4块只输出1V左右,并且需要2秒才能达到1V左右,请问这是什么原因?

电路如下: