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关于DDR3电压拉低的问题,求解答

Other Parts Discussed in Thread: TPS51200

在TI的AM335X设计中,我用TI的TPS51200将1.5V转成0.75V给DDR3的VREF供电,设计过程中我将1.5V和0.75V中间加了点容1.5V正常,而我去掉1.5V和0.75V之间的电容后1.5V会被拉低到0.9V左右,请教为什么?