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UCC28780: ucc28780芯片无法正常启动,RUN没有高电平,PWML没有驱动信号,REF是打嗝状态

Part Number: UCC28780

ACF2.pdfucc28780芯片上电无法正常启动,以下是相关测试波形,图一,一通道测VDD引脚;二通道测HVG引脚;三通道测REF引脚,REF引脚的电压不能一直维持5V,出现打嗝现象。图二,一通道测VDD引脚;二通道测RUN引脚;三通道测PWML引脚,RUN引脚没有高电平,PWML没有驱动波形,芯片不能启动。根据调试手册均检测了以下引脚,均无异问题,但就是pwml和run就是没有信号。此外还附上了原理图,感谢您回答我的问题