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TPS562209一个奇怪的现象

Other Parts Discussed in Thread: TPS562209

我用TPS562209搭一个12V转5V的DC-DC电路,一开始正常输出5V,但是后来一不小心短路,芯片被烧毁,这之后,无论我怎么换新的TPS562209芯片,总是一接12V的电源,芯片就会被烧坏,VIN、SW、GND三个管脚短路,我取下电源芯片,测了一下电路板,没有短路的情况,电容也没有被击穿,电源芯片的焊盘也没有短接的问题,好奇怪,不知道有没有大神帮忙解决一下,非常感谢!