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UCC28780: 电源管理论坛

Part Number: UCC28780

上电后达到了芯片VDD的启动电平,但VDD一直在打嗝状,锯齿波上升下降,

但是检查过芯片VDD的启动电路也是正常的,同时PWML也没有输出,可是RUN引脚也始终不输出高电平,

蓝色为VDD,红色为REF,求解答,感谢!