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TPS2560和TPS2513充电电流一直只有1A达不到2A求助

Other Parts Discussed in Thread: TPS2513A, TPS2560, TPS2513

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?