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UCC28950: Is it possible to use the UCC28950/28951 as a full-bridge converter?

user5303116
Prodigy 30 points
Part Number: UCC28950
Other Parts Discussed in Thread: LM25037-Q1,

Hello
I'm  looking for a controller for a full-bridge converter that satisfies the following conditions.

1. Compliant with AEC-Q100
2. Can work with interleaving
3. Secondary side synchronous rectification

LM25037-Q1 is a candidate, but it cannot clear 3, so it is necessary to use a synchronous rectification controller on the secondary side.
However, we are looking for AEC-Q100 compliant products, including other companies' products, but have not found any at present.

UCC28950/28951-Q1 is a phase-shifted full bridge-converter, but it clears all the conditions.
Is there a way to use it as a full -bridge converter?

  • 0
    TI__Mastermind 45790 points

    Hi,

    Can you share why you prefer a full-bridge converter over a phase-shifted full-bridge (PSFB) converter? What is the power level you are trying to support? Here is a video that compares the two topologies. The key difference is that the full-bridge LLC changes its frequency as a function of load. The PSFB changes the phase but maintains the same frequency. 

    I hope this helps. 

  • 0 in reply to JCHK
    Prodigy 30 points

    Thank you JCHK

    The input voltage is 50V to 100V, the output voltage is 40V to 90V, and the output voltage changes according to the input voltage. (Input voltage -5 to 10V becomes output voltage)
    Output power is 1500W regardless of input/output.
    PSFB has a large resonant inductor on the primary side because high current flows in the primary side under low input/output conditions.
    Since there is a demand for miniaturization, it is difficult to create a leakage inductance in the transformer.
    That's why I chose full-bridge.

    Best regards

  • 0 in reply to user5303116
    TI__Mastermind 45790 points

    Hi,

    Makes sense. Unfortunately, we don't currently have any full-bridge reference designs at this power level. The closest I found was PMP6712 which is back to the phase-shifted full-bridge.

    Another approach might be MCU based, I found the following reference design based on our C2000 TIDA-01168. 

    I hope this helps get you started.

  • 0 in reply to JCHK
    Prodigy 30 points

    Thank you JCHK

    Thank you for the reference circuit information.

    I will consider if there is another way.

    Best regards

  • +1 in reply to user5303116
    TI__Mastermind 45790 points

    Ok please submit another forum thread if you need additional support.