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急急急!TPS65140液晶屏供电负电源一直波动原因?

Other Parts Discussed in Thread: TPS65140

用TPS65140给液晶屏供电,但是负电源一直是-7左右上下波动(0,5V左右),导致屏幕闪烁!这是什么原因啊?项目很急,求指点!