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关于UCC28780调试问题点

Other Parts Discussed in Thread: UCC28780

你好!

UCC28780目前我们在调试过程中发现,SWS_PIN只要一接上,Q3线路中Q3_S PIN电压就会被拉低在2V左右,VDD电压一直为0V。

请问线路上哪里有问题会导致此种状况?从UCC28780芯片手册看到逻辑,芯片启动是从VSW_B向SWS_PIN充电,从而VCC电压起来。