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PFCLLCSREVM034: Question on modifying with 600W 48V output

Catur Rama Nugroho
Prodigy 20 points
Part Number: PFCLLCSREVM034
Other Parts Discussed in Thread: UCC256404, UCC28056, UCC28180, UCC28064A, TL431

Hello TI team,

I intend to buy PFCLLCSR-034EVM for developing my switching mode power supply with modified output 48V and 600W. The plan goes well (so far) as i using your UCC256404 calculator and know which part should i replace to fulfill my needs. What i want to ask are:

1. Recently, I just realized that on webench the UCC28056, the maximum output for the IC is 1A, and i cant found the reason on the datasheet, is it related to the Cr/Cm control method?

2. Should i replace the PFC block with another IC that have wider output and using other IC method such as UCC28056? Is there any resource to learn about PFC block?

3. I dont understand the purpose of TL341 on the feedback circuit, could you elaborate?

 

Thanks,

Catur

  • 0
    TI__Mastermind 27145 points

    Hi Catur,

    1. UCC28056 is a transition mode PFC which in most practical cases, will go into designs up to 300W. Above this, the peak currents become quite big and are more difficult to manage. At 600W, you would want to consider either a CCM PFC or an interleaved transition mode PFC like UCC2864A

    2. I would advise swapping to either UCC28180 or UCC28064A. Either of these will be better suited for the power range you are targeting.

    3. TL431 acts as the error amplifier. It is looking at the REF pin voltage and adjusting how much current it sinks through the opto-coupler to keep the output in regulation.

    Best Regards,

    Ben Lough

  • 0 in reply to Benjamin Lough
    Prodigy 20 points

    Hello Ben,

    Thanks for your answer, going to look into your IC recommendation later.

    Regards,

    Catur