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BQ25756: Reverse Mode Loading issue

Shahzad Hafeezi
Prodigy 50 points
Part Number: BQ25756


Hi,

There is a graph on page 16 of datasheet "SLUSEN5 – AUGUST 2023" regarding Efficiency vs Charging Current. from the graph it seems that current cannot exceed beyond (say) 11A for 48 Vin condition. Is it true ?

Secondly we have tried to run load (Simple LEDs requiring 1A only) in reverse mode, but its not working; load is fluctuating, ON/OFF continuously. May be we are missing some settings. Please guide us. Following is the sequence of I2C commands we have send to enable reverse mode. 

#define ADC_Control_Register(Reg0x2B) 0x80 (enable ADC_EN)
#define Timer_Control_Register(Reg0x15) 0x0D (disable Watchdog)
#define Reverse_Mode_Input_Voltage_Limit(Reg0x0C) 0xBB8 (Output Voltage for Load: 15V)
#define ADC_Channel_Control_Register(0x2C) 0x4A (Disable IBAT_ADC_DIS)
#define Power_Path_and_Reverse_Mode_Control_Register(0x19) 0x21 (Enabled Reverse Mode)

Thanks.

  • 0
    TI__Mastermind 32626 points

    Hello Shazed,

    For question 1, the maximum charge current is 20A. Please note that the FETs can handle the power losses for 20A. You can check the design calculator to find the total power dissipation. 

    For question 2, can you answer a few questions to help me understand what's going on?

    Are you running this on the EVM?

    Are you trying to run multiple LEDs requiring 1 A each?

    Can you try setting SYSREV_UV = 1?

    Best Regards,
    Ethan Galloway