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TPS3707-50DGN易损坏



请教下,我们用TPS3707-50DGN作为电源检测芯片,当12V和5V同时在位时,系统正常开机,否则系统不开机;

实际使用过程中发现,3707非常容易损坏,测试发现PFI输入1.5v是ok的,但是PFO始终输出低电平。这可能是什么原因呢?上下电浪涌?还是设计本身有问题,如附件图纸。