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Original question:

UCC256404: Full bridge LLC Resonant

UCC256404: Full-Bridge LLC with UCC Controllers and Three-Phase LLC Solutions

Conor
Guru 12155 points
Part Number: UCC256404
Other Parts Discussed in Thread: PMP

Tool/software:

Hi Support Team,

I would like to ask about control methods for LLC resonant converters, specifically in the following two areas:

  1. Full-bridge LLC control using analog ICs
    As I understand, the UCC series (e.g., UCC2564xx, UCC25630x, UCC25661x) is mainly designed for half-bridge LLC applications.
    Is there a recommended way to implement a full-bridge LLC using these controllers?
    If so, could you please suggest the most suitable ICs and provide any available reference designs?

  2. Three-phase LLC control
    Is there any method to control a three-phase LLC resonant converter with a single IC?
    If this is not feasible with analog ICs, I assume digital control (e.g., using a C2000 MCU) would be the practical approach. Could you recommend the appropriate devices and any reference designs or application notes (such as PMP/TIDA examples)?

Thank you very much for your support.

Conor

  • 0
    TI__Intellectual 1190 points

    Hi Conor,

    1. Full bridge LLC can be developed by UCC25661x and using isolated gate gate driver UCC5350SBDR. 

    There is no reference design still published. But the circuit will be like below figure:

    Where HO1, HO is connected with HO pin of UCC25661x; and HO is connected with HO pin of UCC25661x

    2. Three phase LLC is not possible by analog controllers. You can create a new thread in C2000 to check the feasibility. 

    Regards,

    Sougata

  • 0 in reply to Sougata Nayak
    Guru 12155 points

    Hi Sougata,

    ■ Additional question to question 1
    Thank you for the reference circuit diagram information. Are there any plans to release a reference design for the UCC25661x + UCC5350SBDR combination? If so, please let me know the specific release schedule.

    ■ Comment on question 2
    I understand that this cannot be achieved with an analog IC.
    I will repost this on the C2000 forum!

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Intellectual 1190 points

    Hi,

    I will check internally if we have any plan to release this type of reference design and get back to you as earliest as possible

    Regards,

    Sougata

  • 0 in reply to Sougata Nayak
    Guru 12155 points

    Hi Sougata,

    Do you have any update?

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Intellectual 1190 points

    Hi, Conor,

    We do not have any plan to release this type of reference design in recent days. Will update you if something got decided. 

    Regards,

    Sougata