Other Parts Discussed in Thread: BQ24780S
Hello there,
I am trying to adjust valid input voltage range to be 11.9V-15.1V. The values of resistors on voltage divider to ACDET are 470k and 121k. I'm testing with the power supply, voltage set to 12V. What I observe is that output voltage from a charge controller is constant but ACOK toggle low every ~50ms for duration of ~20us. This is sufficient to indicate to a microcontroller that something is wrong with a charger and put it in a panic mode. The issue with ACOK goes away when I adjust input voltage to ~13V (input current 2.6A, current limit set to 2.9A). Why is this happening? Can I fix this in hardware somehow? I would like to use both 12V and 15V power supplies with this charge controller. Ideally, I would like to have even wider input range, but I understand it is not possible since input to ACDET has to be between 2.4V-3.15V. Something to note.. datasheet states that AC adapter operating range is 4.5V-24V which is deceiving. I don't see what resistor values on voltage divider can give this input voltage range.
