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TPS54331损坏

Other Parts Discussed in Thread: TPS54331

现在生产过程中出现54331  VIN脚与PH脚击穿或者PH脚电压输出偏低,想问下是什么原因造成这种问题,同时怎么辨别其TPS54331的真假,其编码规则 请哪位提供一下谢谢,附件为原理图及料盘标签

图纸.7z