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困扰,LM22677反馈电压不对



在使用LM22677-ADJ的时候,我用24V输入,输出为+6V。但是有时候上电会出现输出电压不对,有时候是0v,有时候是12v,也出现过24v,此时量FB端电压也不是1.285v。

电路与参考设计一致。