BQ25856-Q1: BQ25856-Q1 Automatic Reverse Function Failure

wang ming

Part Number: BQ25856-Q1

1、After main power removal, the backup battery output boosts to 50V, but sustains only for tens of seconds before dropping to zero. The cause is currently undetermined.

2、Configuration of the auto-reverse function results in charging failure of the device and overcurrent protection triggering on the adjustable regulated power supply

4 天前

0 Links 1 天前

TI__Mastermind 30940 points

Hello!

We have received your case and will take some time. Thank you for your patience.

0 wang ming 1 天前

Prodigy 20 points

Hello, do you have a solution yet?

0 Links 15 小时前回复 wang ming

TI__Mastermind 30940 points

The overcurrent protection on the power supply is likely the cause of this. What do your registers report?

0 wang ming 14 小时前回复 Links

Prodigy 20 points

REG0x00_Charge_Voltage=0x0010(22V 6sLFP);

REG0x02_Charge_Current_Limit=0x0640,I use ICHG pin set the current 5A;

REG0x0A_Reverse_Mode_Input_Current_Limit=0x0640

How does the BQ25856 detect main power disconnection?

Currently, we are more concerned about the first issue: why does the reverse boost output drop to zero after sustaining for a period of time（22V->50V）, especially since no overcurrent or battery voltage drop has occurred at that moment?

0 wang ming 5 小时前回复 Links

Prodigy 20 points

电源管理

电源管理论坛

BQ25856-Q1: BQ25856-Q1 Automatic Reverse Function Failure

How does the BQ25856 detect main power disconnection?