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LM5140-Q1 ,VCC引脚失效

Other Parts Discussed in Thread: LM5140-Q1

用LM5140-Q1驱动GaN时,VCC 脚失效,具体情况是:在工作一段时间后,vcc突然降到0V,经测量,16pin到地阻抗很低,有的接近为0,15pin阻抗正常;15pin和16pin在PCB板上都是VCC,由LM5140-Q1芯片内部LDO出来的;同样是VCC电源网络,16pin被打坏,15pin是好的,3块板子同样的情况,不知道这种情况是怎么引起的。