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TPS2546: TPS2546 output voltage abnormal when plug in power-off iPhone6

Part Number: TPS2546

Dears

My customer encounter one problem: when TPS2546 work in CDP Mode, its output volatge 5V change to 4.3V when plug in powered-off iPhone 6, and it havn't charging;  then unplug iPhone6 , it still maintain in 4.3V.

But it can work in CDP normal when plug in powered-on iPhone6.

So why is this strange phenomenon happening?