BQ24171:Switching between CC and CV charging, and operation when cells are disconnected

Hi Okashita,

Regarding 1, the voltage sensed at FB must be at 2.1V in order for the charger to change from CC to CV mode.

Regarding 2, yes because the charger is going in and out of termination as the output capacitance is charged, discharges, recharges, etc.

Regards,

Jeff

Hi Jeff

You mentioned that the timing for switching to CV charging is when FB reaches 2.1V, is that when the voltage divider resistors for FB are 100kΩ and 100kΩ?
In the current design, the voltage dividers are 97kΩ and 100kΩ to set the charge voltage at 4.1V.
In that case, at what voltage would it switch from CC to CV?

Best regards,
Okashita

Hi Okashita,

4.1V.

Regards,

Jeff

Hi Jeff

I understand.

Thank you.

Best regards,
Okashita