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UCC28070与UCC27324接地点问题。

Other Parts Discussed in Thread: UCC28070, UCC27324

各位好,现做个3KW pfc出现点问题,来向大家讨教。官方3KW PFC DOME中,UCC27324 PIN3接的是MOS的S级。但是我这个一接到MOS 的S,输入调压器震动异响,无法正常工作,只有27324的GND接到芯片UCC28070的GND才能正常工作。这是什么情况?