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TPS23861PW芯片高压烧坏问题?

我用48V的适配器不断上电下电,TPS23861PW芯片正常工作,一旦换用56V的适配器上电几次就挂啦。3.3V击穿啦。3.3V到GND的阻值为35R左右。

疑问:

1.规格书上面说VPWR可以达到70V,为什么56V就会挂掉?

2.3.3V击穿是不是VPWR串过去的,导致3.3V击穿?