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UCC28780: Application for Battery Charger

Che yi Su
Expert 1695 points
Part Number: UCC28780

Hi TI experts,

Does UCC28780 suitable to be a battery charger? As I know, it has four mode SBP, LPM, ABM and AAM. If yes, would you provide reference design for us? Thanks.

  • 0
    TI__Mastermind 40580 points
    Hello Che,

    Thank you for your interest in the UCC28780 for your battery charger application.
    Yes, the UCC28780 is indeed quite suitable for use in a battery charger.

    At this time, TI has 3 reference designs currently available on our website:
    www.ti.com/.../TIDA-01623
    www.ti.com/.../TIDA-01622, and
    www.ti.com/.../PMP40328
    (There may be more reference designs being planned or developed but I am not aware of them. )

    To find reference designs, click on the "Applications & designs" tab along the red banner at the top of the TI home page.
    Then click on "Reference designs >" link at the right side of the Applications & designs page.
    Then enter a keyword (in this case "UCC28780"), or fill out the design parameter table, or select market and sector options.

    Regards,
    Ulrich
  • 0 in reply to Ulrich Goerke
    Expert 1695 points

    Hi Goerke,
    No, I'm mean UCC28780 to do a charger, not adapter. Charger include CC and CV control, but adapter only CV control. UCC28780 has four mode SBP, LPM, ABM and AAM. I don't know is it suitable to do a charger.

    Vin：85~264Vac, 47~63Hz

    Out：0.75V/1A, >0.75~14V/2A

  • 0 in reply to Che yi Su
    TI__Mastermind 40580 points
    Hello Che,

    In principle, the UCC28780 should be adaptable for some degree of CC control, however it was not specifically designed for this function so applications will be limited. We have not made any designs involving CC feedback, so our expectations of the limitations are based on thought and datasheet parameters rather than experience.

    Basically, CC control operates at maximum output current so it begins in AAM. As the load resistance goes down, the CC control should take over from the CV control in the same manner as existing chargers. However there is a limited range of Vout for which it will operate in AAM. We think it should still be able to function in CC while operating in ABM, provided that Vout is still high enough to provide charge to the primary-side VDD input above 10V, and to keep the VS input above 0.6V. (VS < 0.6V enters a lower peak current start-up mode). OVP is at 4.5V, so ideally there is a 7.5:1 range for Vout. In practice, it will probably be less than that.

    Your application range of 14V to 0.75V represents an 18.7:1 range for Vout. This is far too wide for the UCC28780, unfortunately.

    So the UCC28780 may be able to support some CC functionality, it appears to be unsuitable for your application.

    Regards,
    Ulrich
  • 0 in reply to Ulrich Goerke
    Expert 1695 points
    Hi Goerke,
    Do you have high efficiency and isolate output solution for this product? Many thanks.
  • 0 in reply to Che yi Su
    TI__Mastermind 40580 points
    Hi Che,

    Yes, there are the 3 reference designs I mentioned earlier (see my reply of Jan 02, above), each with efficiency data.
    Plus, there are 2 EVMs, one using GaN FETs and one using Si FETs:
    www.ti.com/.../UCC28780EVM-002
    www.ti.com/.../UCC28780EVM-021

    All of them are isolated outputs. Unfortunately, none of them have CC capability.
    Please visit their respective web pages for details.

    Regards,
    Ulrich