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bq24297 charge current decrease with a smaller VinDPM setting

Other Parts Discussed in Thread: BQ24297

Hi, team,

My customer is testing bq24297, we found a strange phenomenon. 

ICHG=1.5A (approximately), Iin_limit=3A, adaptor is 5V/1A, we found when we reduced Vin_DPM setting value, the input current also decreased, and the voltage at VBUS pin also decreased to the same value as set Vin_DPM. But in theory, lower Vin_DPM allows bigger input current, how come the voltage drop on the USB wire become bigger when the current become smaller?