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LM5576不工作

Other Parts Discussed in Thread: LM5576

这个电源IC  LM5576不工作,同时检查发现续流二极管D2被击穿,板子上的SWITCH芯片、ARM也损坏(其中ARM可测试到 VDD与GND之间短路)。请教一下,是什么原因可能会将这个电源IC烧成这样?谢谢,已批量生产4000套,这有一套出了这问题