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TPS56339: TPS56339电源芯片断电烧片子问题

Part Number: TPS56339

各位工程师们,我在测试TPS56339输出电压电路遇到了烧片子的问题

19V的输入能输出12V或者5V,但是断电后这个芯片就会被烧坏,是按照官网给的典型电路去设计的

请问这是什么问题:PCB图如下