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TPS650864: tps6508641输出异常,LDO3V3有下拉的现象

Part Number: TPS650864


各位专家好,

我目前用tps6508641+MPSOC,软件DEBUG的时候,有时候发现LDO3V3有下拉0.6V左右,导致BUCK3(DDR_1V2),BUCK4(VCC_3V3_BUCK),都有下拉现象。看资料LDO3V3是12V经过LDO直接输出的,12V没有发现抖动,LDO3V3也只有8个上拉电阻,不知道为啥LDO3V3不稳。LDO3V3上面增大滤波电容,可以减小概率,但是没有根本解决问题。