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UCC28742: Can flyback used in 200W output power, 400V DC Vin, 110V DC Vout?

Yunjing Wang1
Expert 4300 points
Part Number: UCC28742
Other Parts Discussed in Thread: LM5036, UCC28250, LM5039, PMP10110

Dear team,

My customer want to design an isolated DC-DC scheme, which is used between a 1kW PFC output and an inverter.

As there are 3 channels signals for redundancy, they want to use a simplest DC-DC scheme, in order to reduce controller number for 3 channel.

Q1: Is there any reference isolated scheme for least controller number? Output power is 200W.

Q2: Can they use flyback for 200W output power or a multi-side flyback for 3*200W output? I didn't find a flyback reference design above 200W.

Q3: If flyback can achieve 200W or multi-side 600W output power, is UCC28742 suitable? Or any other reference?

Thank you & Best regards

Yunjing

  • 0
    TI__Expert 6080 points

    Hello Yunjing,

    May I direct you towards an LLC solution followed by your 1kW PFC. I think it will be more lenient in terms of meeting efficiency requirements than a flyback solution, especially for such high power.

    Please look at the TIDA design in the link below for reference:

    http://www.ti.com/tool/TIDA-01501

    Regards,

    Sonal

  • 0 in reply to Sonal Singh
    TI__Expert 4300 points

    Hi Sonal,

    Thank you for your reply..

    Customer prefer a simpler debug scheme rather than LLC, so they are going to use one half bridge for each 200W output channel.

    I think this scheme is OK, right? And is there any reference design on your side of LM5036 or UCC28250 for about 200W output, 380V~400V DC input ?

    Thank you.

    Best regards

    Yunjing

  • 0 in reply to Yunjing Wang1
    TI__Mastermind 31580 points

    Hi Yunjing,

    LLC is the most popular for 400V input because of ZVS. LM5036 and UCC28250 are targeted at telecoms input voltage range, 48V, where the lack of ZVS is not an issue.

    Flyback topology is not suitable over 150W.

    PMP10110 is a hard switched half using the LM5039 in the isolate stage. This may be of use to you if your customer does not want to use LLC.

    Regards

    Peter