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TPS2378DDAR做的PD无法上电问题

Other Parts Discussed in Thread: TPS2378, TPS23754

TPS2378DDAR做的PD,单独给板子供电没问题;

1、板子先插网线,然后板子会上电启动,插入电脑串口调试板的地线或者示波器的地线,也没问题,带得起来;

2、板子先插入电脑串口调试板的地线或者连接示波器夹子的地线,再插入网线,板子上不了电,无法启动,VSS脚对RTN有-5.6V-0V跳变;

3、板子先插入电脑串口调试板的地线或者连接示波器夹子的地线,再插入网线,板子上不了电,无法启动,VSS脚对RTN有-5.6V-0V跳变;拔掉电脑串口调试板的地线或者连接示波器夹子的地线立马上电OK;

TI的大佬们帮忙分析下原因;