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WEBENCH® Tools/UC3842: Suggestion for Battery Charger Design

Ajith Prabhakar
Prodigy 110 points
Part Number: UC3842
Other Parts Discussed in Thread: UCC28700

Tool/software: WEBENCH® Design Tools

I have done a power supply design in WEBENCH and and i have to design a battery charger with the same specification please provide your suggestion on the changes i have to make.

  • 0
    TI__Mastermind 25570 points

    Hello Ajith

    If you give me some more information I can give some better advice -

    What is the input voltage range - 80V to 264V at 50/60Hz is fairly normal

    What is the power level -

    What is the output voltage range - deep discharge to full charge ?

    Do you need a CI/CV charging characteristic - what constant current charging level do you need

    What switching frequency are you planning to use

    What MOSFET are you planning to use for M1?

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Prodigy 110 points

    Thanks for your reply. Sorry for my late reply as i have changed the design using the IC UCC 28700 and have some doubt about it too. Can it use to charge a 12v battery and if the battery draws more current than the specified then the output limit it or not. WBDesign44.pdf

  • 0 in reply to Ajith Prabhakar
    TI__Mastermind 25570 points

    Hello Ajith

    The UCC28700 will provide a primary side current limit set by the current sensing resistor Rcs. The primary side current limit is modified by the 7.5k resistor at CS so that if the input voltage increases or decreases the CS limit point (on the primary) is decreased or increased so that the output current limit point remains constant.

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Prodigy 110 points

    Hi Colin,

    Thanks for your answer. I have one more concern about the battery voltage too. If battery voltage is too low then what effect it causes on output current. Is that just limit the current or there is any mechanism that turnoff output when vout is low or current drawn is high.

    Thanks in Advance.

  • 0 in reply to Ajith Prabhakar
    TI__Mastermind 25570 points

    Hi Ajith

    If the battery voltage is too low then the controller will limit the output current at the current limit point. There is no auto disconnect or auto off feature on the controller so this type of protection will require additional circuits on the secondary side.

    BTW: if the battery voltage is 'too low' then depending on the type of battery and its chemistry, it may be damaged if the initial charging is done at the normal charging rate.

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Prodigy 110 points

    Hi Colin,

    Thanksfor your answers.

    Regards Delphin