Other Parts Discussed in Thread: BQ77905
Im am having a problem with the typical application BQ24610 design. The system was working just fine charging the battery just fine then the charging stopped (not due to over temperature). Also the STAT 1 LED is blinking with a regular frequency. When the blink occurs the battery voltage jumps up 0.8 volt form 15.8V to 16.6V. Its not a clear jump at first the voltage rises about 0.1V then the rest.
The system is using a BQ7790509PW battery protector, 4S battery and 20V input to charge.
IC setting are: 1.7A for max charging current, 0.3A for precharge, 3A max adapted current, TTC of 6.5h.
VREF is 3.3V, VFB is about 2V, VTS is 1.6V. If any other voltages need to be measured please tell me.
I also probed the charging mosfets and found that the device starts to charge then stops. So why does it stop?
The schematic is available bellow.
Thank you for your time and replay.
Best regards Gregor Schematic_Projekt-LED-Mitja_2020-06-06_19-23-36.pdf