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TPS54320短路问题

Other Parts Discussed in Thread: TPS54320

请参考如下电路图:

12V 输入,5.1V@2A输出。客户测试了接近50pcs,有8pcs出现问题,现象是TPS54320 PH引脚对地短路。请帮忙分析一下原因,谢谢!