您好，我用TPS2560和TPS2513配合成充电电路，接上能正常以5V2A充电的手机，充电电流只有1A，D+ 和D- 的电压只有0.28V，换成给5V2A充电输入的充电宝充电，充电电流也只有1A，但是D+和D-电压分别是2.7V和2V。将TPS2513换成TPS2513A，给手机和充电宝充电，电流一样上不去；给IPAD充电，电流也只有1.13A。请问是怎么回事？
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