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TPS74201意外损坏的原因?

Other Parts Discussed in Thread: TPS74201
 我在使用TPS74201时,TPS74201的芯片被损坏。测量其BIAS和GND管脚,发现两者之间的阻抗只有8欧姆左右。
我的电路图如下所示。已经损坏了好几片了。这大概是什么原因造成的?