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BQ25756EVM: BQ25756EVM

nobuyuki.hanaoka
Prodigy 40 points
Part Number: BQ25756EVM
Other Parts Discussed in Thread: EV2400, BQ25756

Hello

I am trying to evaluate at 240W output in BQ25756EVM without a battery.

But I couldn't find how to run BQ25756EVM at 240W output in the document of BQ25756EVM and EV2400.

Please tell me how to run BQ25756EVM at 240W.

  • 0
    TI__Mastermind 30705 points

    Hello Nobuyuki,

    By 240W output, are you trying to evaluate a USB-EPR input/output or are you trying to charge a battery at 240W?

    The BQ25756 can handle all the voltages and currents of a USB-EPR input. In addition, the BQ25756 can output all voltages and currents needed for USB-EPR in reverse mode as well.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    Prodigy 40 points

    Hello Ethan.

    Thank you for response.

    I am trying to evaluate a USB-PD input/output.

    Reverse mode means that the VAC in the figure below is treated as Output and VBAT is treated as Input, right?

    And if so, a USB-EPR(48V/5A) can be evaluated by using a 12V battery or power supply device as an input and a load resistor as an output, right?

    In that case, what specific steps should I take with this board?

    Do I just set with single resistor on the Vin and VOUT pins? or Do I need to configure anything in Battery Management?

    Please give me any suggestions.

    Best Regards,

    Nobuyuki

  • 0 in reply to nobuyuki.hanaoka
    TI__Mastermind 30705 points

    Hello Nobuyuki,

    nobuyuki.hanaoka said:
    Reverse mode means that the VAC in the figure below is treated as Output and VBAT is treated as Input, right?


    Yes, that is correct.

    nobuyuki.hanaoka said:
    And if so, a USB-EPR(48V/5A) can be evaluated by using a 12V battery or power supply device as an input and a load resistor as an output, right?


    Yes, that is correct.

    nobuyuki.hanaoka said:

    In that case, what specific steps should I take with this board?


    To run a USB output, you'll need to set EN_REV = 1, set VSYS_REV to the desired output voltage, and set IAC_REV to desired output current limit. When the BQ25756 starts in reverse mode, the reverse output voltage is 5V by default.

    You will also need to change the 2mΩ sense resistor to a 5mΩ sense resistor for the reverse current limit to be accurate enough to meet the USB-EPR standards.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    Prodigy 40 points

    Hello Ethan

    I was able to confirm the BQ25756 outputs 240W!

    Thank you for your support!

    Best Regards,

    Nobuyuki