Other Parts Discussed in Thread: BQ25720
Hi,
I am using bq4050EVM board as BMS for 2S 6000mAH LiFePO4 battery pack and bq25720EVM board as charger,
My adapter SMPS has output rating of 24V 10A.
While charging the battery pack, voltage and current received from the host is 7.2V and 3A respectively.
When I started the charging, pack voltage was around 5.6V and charging current was around 2.85A(near to 3A) but as soon as voltage reached around 6.4V, charging current dropped to
around 1.5A and by this time battery capacity hardly reached to 2000mAH. So my question is that is it happening due to charger entering into CV mode?
If yes, then why it is entering into CV mode so early? shouldn't it enter near to the charging voltage which is 7.2V? if Enters into CV mode at this time then it will badly affect the charging time of the pack.
If not, then please suggest the changes where I am doing the wrong setting.
I have attached the saved register file of bq25720 while current received is 3A but charging current is 1.5A.
* Created: Tue Aug 09 18:31:48 IST 2022 * * Format: Register Name tab Character,\t Hexadecimal register value. * Device: bq25720 * BQZ Container: Charger_1_00-BQ25720.bqz * Charge Option 0 E70E Charge Current 0B80 Max Charge Voltage 1C20 OTG Voltage 09C4 OTG Current 3C00 Input Voltage 36C0 Min System Voltage 4200 IIN_HOST 4100 Charger Status 8400 Prochot Status B800 IIN_DPM 4100 ADC VBUS and PSYS C100 ADC IBAT 0000 ADC IIN and CMPIN 0000 ADC VSYS and VBAT 0000 Manufacture ID 0040 Device ID 00E1 Charge Option 1 3300 Charge Option 2 00B7 Charge Option 3 0434 Prochot Option 0 4A81 Prochot Option 1 41A0 ADC Option 2000 Charge Option 4 0048 Vmin Active Protection 006C
