BQ24157: charge current decreases prematurely during current regulation phase

Hi there,

The impedance between the battery voltage sensing CSOUT and the PACK influences the entrance of the CV mode. The CSOUT pin is what the battery remote sensing for the battery voltage. The parasitic impedance between the CSOUT and the batter terminal has impedance including the long cable resistance in the setup. Although battery terminal seems not reaching the CV voltage, but the CSOUT feedback the charger with a higher voltage, causing the charger CV mode earlier. Higher charging current causes the CV mode entrance earlier. From this point of view, the layout and setup need to be optimized for the CSOUT pin to reflect the real battery pack voltage with minimal impact of the current.