Other Parts Discussed in Thread: BQSTUDIO
Tool/software:
Hi,
I am using the BQ76952 in a 4 cell stack up with the cells at 1, 2, 3 and 16. I have external balancing circuits with about 350mA. Cells 1, 2 and 3 are balancing just fine but cell 16 seems not to balance even though BQ Studio displays that it is balancing.
I have attached a word doc with the schematics. The system supports up to 14 cells and with stuff options/variants we have a few SKU's of the board to support different battery stacks. The one in the schematic is for a 4 stack. 0 ohm resistors connect all the unused cells.
We used the recommend 100 ohm resistors (R24 et all) to reduce heat in the BQ76952 and have used a 12 ohm, 2W resistor for external balancing. We also used 20 ohms (R129) at cell 16 which was recommended by TI.
Thanks!!
John