I am using a 3S (series) lithium polymer batteries (the ones we get from hobby king). I have designed 2 boards .
1) charging board - using the BQ24170.
2) balancing board using - S8204B.
I am charging the battery via the charging board and it takes about 1.5 hours to charge at a current of 3 Amps or so.
Now, the connection is as stated - bench power supply/wall adaptor -> BQ24170 charger -> battery.
I put the balancing circuit as stated - bench power supply/wall adaptor -> BQ24170 charger -> S8204B balancer -> battery.
Now, as is shown in fig 1 -- the battery takes about 4-5 hours and the current does not exceed 1.2 Amps, How it is possible ?
I checked if the MOSFETS is turning on/off making the charging slow, but they were not behaving so, then i isolate the charging MOSFET (charge FET Q3). I did it by constantly pulling the gate to EB+ and never shutting the charging FET. I hope that the charging would fasten up, but still doesn't work.
Any suggestions please ?