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TPS70302 总是烧坏

Other Parts Discussed in Thread: TPS60302

TPS60302底部已经焊接上,刚上电,这款芯片两个输出引脚还有输出,过一会Vout2输出为5V,Vout1不输出,芯片就坏了?但芯片不发烫。

附件原理图有问题吗,怎么防止这块芯片被烧