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LM74502: LM74502QDDFRQ1 高温高湿测试中gate-src输出只有2V

Part Number: LM74502
LM74502QDDFRQ1在高温65℃,高湿93%的环境下出现GATE掉压,3块样品同时测试,只有1pcs出现GATE掉到对地GND 只有7V。GATE-SRC之间只有2V。其他输入条件均正常,可参考下面的表格。
设备重新上电也无法恢复正常,GATE-SRC还是只有2V。短接GATE和VCAP可让样件恢复正常,gate-src有12.4V,请问是什么原因导致GATE输出低压?问题根因在哪里?