Hi!I have a problem with using bq24620 in my design. bq24620 schematics was taken from EVM for IC.In my design one charger charge battery with BMS, and then battery is the source for second charger. Firstly, i have a problem with CE:if i connect it to MCU and set high level, charger don`t start. This problem was solved connecting CE to VREF in both chargers. Secondly, i have a problem with second charger. When BMS switch on power to the charger, PG start blinking ~20Hz, STAT is off. When i connect external battery, i see normal current on ammeter, but frequency of switching FET is very low(1000-3000Hz), and i can hear it. If i connect external power supply to first charger, and then connect second second charger with battery, second charger start working on 300k frequency, but if external power supply is disconnected, frequency returns to 3k. I try to connect battery without BMS to the input of charger2, but result is the same.Scheme of system: Power Supply->Charger1->BMS->Charger2->External battery.
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