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TPS5430: 芯片烧坏,6,8引脚会短路。

Part Number: TPS5430

   原理图和PCB如上图,最终参数按照TI的WEBENCH修改成了 30转+-25V的配套参数,但是每次拨动开关,芯片就会立刻烧坏,最开始烧坏我通过在芯片VIN处加一个100uF的电解电容得到解决,但是30V转-25V的依然没有解决,每次烧坏都是芯片的6和8短接,求问佬们是为什么,怎么解决?