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TPS7A8300: Ven早于Vin上电,是否会导致输出电压异常?

Part Number: TPS7A8300


1、原理图及失效现象:

原理图,VenVIN的时序见下图

②异常现象:PCBA正常上电后,V1V0_MGTAVCC的电压会异常跌落,出现的频率有时11次,有时1个月也不一定会出现。电压跌落的波形见下图

③将TPS7A8300RGW更换为TPS7A8300ARGW后,暂未复现问题

2、期望确认的问题

①对于TPS7A8300RGW来说,Ven早于Vin上电,是否是导致如上问题的原因;

②如确是VenVin的时序导致电压异常跌落,那替换为TPS7A8300ARGW是否可以解决此问题。