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Lead Acid Battery Charger for 2 serial 12V Lead Acid Batterys

user3502896
Prodigy 70 points
Other Parts Discussed in Thread: UC2906, BQ24610, BQ24450

Hello at all

I am locking für a lead Acid Batterie Charger for 2 serial 12V Lead Acid Batteries. My Charg Current must between 150 mA to 500mA.

My Supply Voltage is from a step up and can change between 24V and 33V.

Which is the right choice for my charging Point.

Kind Regards Olli

  • 0
    TI__Guru**** 165766 points

    Hi,

    UC2906 is linear charger controller of external pass FET that can operate up to 40V input.

    BQ24610 is switching charge controller of external switching FETs that can operate up to 28V input.  It will need a few modifications for optimal lead acid charger as documented in the app not at .

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 70 points

    Hello Jeff

    is it possible to use the BQ24450 for my problem.

    I will use a step up from 24 V to 32V, after that i like to use the BQ24450 for my Batteries.

    What do you think about that.

    Regards Oliver

  • 0 in reply to user3502896
    TI__Guru**** 165766 points

    Oliver,

    Yes, you can boost the input and use the BQ24450.  Please be aware of external pass element power dissipation.  I recommend boosting only high enough to prevent the pass element from entering dropout, in order to minimize heating due to power dissipation.

    Regards,

    Jeff