I have a BQ25672EVM connected to one PSU on VIN1, nothing on VIN2 et USB connector, one 5W 10ohm resistor between SYS pin and GND, one cell LiFePO4 battery on Battery port.
I would like to use UVB from Vin=4 to 7V.
I set VAC_OVP = 7V, Charge current=1A, Voltage Charge =3.75V and Cell=1S with TI Charger GUI.
Battery is partially charged.
First step Vin1= 5.0V, VBAT=3.5 IBAT=1A , VSYS=3.53V and Iload=0.353A.
I tune up Vin up to 7V. At 7V AC1_OVP is detected and BQ switches on Battery as active power source.
I tune down slowly Vin1. BQ switches back on Vin1 as active source. Charge is active .
I go on tuning down and at 6V BQ switches on Battery . Why?
The only way to force BQ to Vin1 again is to switch OFF/ON Vin1.
I expected that once OVP condition disappeared, Vin was the active source as long as Vin is between Vac_Present(2.8V) and Vac_OVP(set to 7V).
May you please explain BQ behaviour and recommand one regsiter setting for my target application ?