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TPS65150无输出问题请教

Other Parts Discussed in Thread: TPS65150

本人第一次使用TPS65150电源芯片,基本按规格书中电路图设计,但在样板测试时,AVDD无输出,故对几个点抓波形如下,请教各位工程师,帮忙分析一下是哪里问题,谢谢!