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tps54560降压模块芯片为什么会烧坏?

Other Parts Discussed in Thread: TPS54560

使用贵公司的tps54560芯片做降压模块,48V降5V,用我们的稳压源连接上测试是正常的,可是接到48V的锂电池上面芯片一下子就烧坏了,请帮忙解决这个问题.

附原理图和PCB图.