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关于UCC21732驱动关断问题

Other Parts Discussed in Thread: UCC21732

你好:

        想请教一个关于UCC21732驱动芯片的问题,最近调试发现,峰值电流在500A左右时,UCC21732驱动芯片二次侧VGE电平出现非正常关断现象,且是不跟随一次侧PWM的非正常关断现象。
驱动设计如下所示:VDD为+15V  VEE为-5V

实际测试波形如下所示:
其中蓝色是上桥VGE,红色下桥VGE,黄色是一次侧PWM
请教一下,出现这种非正常且不跟随PWM控制的关断是什么原因?