I'm using the BQ24401 to charge 3s NiMH batteries 3.6V 1600mAH.
I'm using a 5V input to the charging circuit this voltage drops to 4.5 though the diode.
Circuit is set up for a max current of 500mA.
Everything seems to be working ok. I'm curious about the trickle charge. I plugged a battery pack in that's been drained to 0.9V.
The trickle charge begins and seems to be working but it seems to bring the battery back to a certain point then it can't get past it.
The voltage at the BAT pin is between 608-650mV and the battery voltage is up to 1.8-2.0V. You can see the current on the 5v line pulsing at 50mA.
It has been on for 18 hours.
Is there something in the circuit I can adjust to get the trickle charge to push past this point and kick into fast charge?
Thought about increasing the Rmto to even out the duty cycle a little I currently have a 39.2K and Cmto is 0,15uF.
Please advise.