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BQ24617: Using BQ24610/8 as alternative to BQ24617

Tim Curnow
Prodigy 40 points
Part Number: BQ24617
Other Parts Discussed in Thread: BQ24618, , BQ24610

I'm having trouble procuring BQ24617 but can get BQ24610 or BQ24618. Is there a way to 'trick' these devices into working with the lower ACOV of 26V instead of 32V? I'm thinking a resistor divider on the VCC pin or something along those lines. Any ideas?

  • 0
    TI__Mastermind 34215 points

    Hello,

    I would not recommend adding a resistor divider on VCC as this is the IC positive power supply. In addition, I do not think a resistor divider would help as the threshold for this device is above 26 V rather than below 26 V (in other words you need a way to assert 32 V on VCC when you have 26 V which is a voltage increase). You could add a comparator that pulls the CE pin low to disable charge when you get above an input voltage of 26 V.

    Regards,

    Mike Emanuel

    Please click "Resolved" if this answered your question.

  • 0
    Prodigy 40 points

    Hi Mike,

    Thanks for your helpful comments. I actually need the device to turn off the ACFETs when the input voltage exceeds 26V, to protect downstream components. It sounds like I need to design an external circuit with a comparator that overrides ACDRV and pulls the gates of the ACFETs high. Are there any app. notes for this type of circuit?

    Kind regards,

    Tim 

  • +1 in reply to Tim Curnow
    TI__Mastermind 34215 points

    Tim,

    You could implement a PFET on the input that is driven by a comparator that cuts off the input if the input rises over 26 V.

    Regards,

    Mike Emanuel

    Please click "Resolved" if this answered your question.