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BQ76930+BQ78350 评估板设计问题。

Other Parts Discussed in Thread: BQ78350

本人按照评估板上的电路图设计电路并焊接,发现一上电,BQ78350外扩的LED小灯瞬间全亮以后 立马熄灭,好像是烧了,芯片也感觉是坏了 ,请问这是什么原因。