Part Number:BQ24780S
Dear All:
we use the BQ24781 to design 4-cell charger system for Gaming application. the single cell voltage is 4.35v, so the battery pack is 17.4v
issue is as below.
remove the adapter the voltage in input PIN is slowly falling until the input Pin voltage is equal to the battery voltage.
the battery voltage will pour back to the input Pin, the system think the adapter is not removed. so we adjust the ACDET partial resistance
that the lowest voltage is match 18.1v. but we use the 19.5V adapter, the output voltage allow 10% drop under overload time that it continues 10us,
that means the output voltage can drop 17.55V in this time。 it can't meet the lowest voltage request.
can you give the good advice to solve this problem
by the way, how much the ACOK falling deglitch time when the ACDET detect falling threshold voltage? I can't find the information in the datasheet. thanks！