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TPS923652: Battery charging application

Hirotsugu Kobayashi
Mastermind 9540 points
Part Number: TPS923652

Tool/software:

Hi team,

I am considering a boost charging circuit for NiMH.
How will it behave if the output voltage becomes lower than the input voltage?
I am considering a 24V input, battery voltage of 19-30V, and a charging current of 400mA.

Best regards,

  • 0
    TI__Mastermind 23190 points

    Hi Hirotsugu,

    Hirotsugu Kobayashi said:
    How will it behave if the output voltage becomes lower than the input voltage?

    You should never use boost configuration of TPS92365x in conditions where input voltage is higher than output voltage. If input voltage is higher than output voltage, the output current will be out of regulation and overcurrent / damage will happen.

    Hirotsugu Kobayashi said:
    I am considering a 24V input, battery voltage of 19-30V, and a charging current of 400mA.

    You can consider using buck-boost configuration of TPS923652 to do this.

    Best Regards,

    Steven

  • 0 in reply to Steven Li
    Mastermind 9540 points

    Hi Steven,

    If the current is no longer regulated, will it detect LED+ short to GND and stop switching?
    Some boost converters have a pass-through mode, would that work in a similar way?

    The buck-boost configuration in the datasheet cannot be used to charge a battery.

    Best regards,

  • 0 in reply to Hirotsugu Kobayashi
    TI__Mastermind 23190 points

    Hi Hirotsugu,

    Hirotsugu Kobayashi said:
    If the current is no longer regulated, will it detect LED+ short to GND and stop switching?

    The IC will stop switching, but it cannot control the output current since there is always a current path from VIN, inductor, Schottky diode, sense resistor, load and then to GND.

    Best Regards,

    Steven