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TPS54821: PWRGD偶发震荡

Part Number: TPS54821

在使用过程中偶发pg震荡,造成后端上电失败。

该震荡有时是在电源ok后18ms以内,有时候是一直这样

目前试过的方法:

去掉了VD1, 将R71和R6换成10K/4.7K,无变换;

更换RT ,100k/130k/150k都是试过,均不行;