I'm designing a 12 position gang charger using the bq24104 and am conerned about interactions between the individual chargers, since they will run from a common power supply. A colleague of mine noted in a recent lab experiment that running 2 bq24125 resulted in oscillation when running 2 chargers from a single supply. I want to avoid this issue in my design so any suggestions would be helpful. In designing the 12 bay charger, can I get some reccomnedations on power supply rating output capcitance , etc? I'm comfortable with the design I've put together for the individual chargers, but unsure what will happen with 12 in paralell. I could throw extra input capacitance on the board, but then again, over-engineering is not free.
The design I'm putting together has 22uF input on each individual charger, and 6.8uF output capacitance. The charging current is 450mA. I plan to do a star type power bussing on the PCB to the point where the 12V from the wall wart comes to the board.
