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WEBENCH® Tools/UCC28C42: POSITION OF COMPENSATION CAPACITOR

Vishal Kakade
Expert 1625 points
Part Number: UCC28C42
Other Parts Discussed in Thread: TL431

Tool/software: WEBENCH® Design Tools

Hi Experts,

I am designing a Flyback converter with the below specifications.

Vin: 18V to 36V

Vo: 24V @ 1.2A

Datasheet show R and C in series and both are parallel with One more C. But Webench generates RC parallel and in series with one more C. Which is correct? Attached images for reference.

1: Webench

2: Datasheet:

Regards

Vishal

  • 0
    TI__Genius 9790 points

    Hi, Vishal

    Thanks for your interest in TI here. I will be happy to route your request into the appropriate team to support. Please note the team that supports this device is in the US so they will have a delayed response due to the US holiday. Please expect a response in the week of Jan 4th.

    BR,

    Yunsheng

  • 0 in reply to Yunsheng Qu
    TI__Mastermind 32775 points

    Hi Vishel,

    Thanks for your patience during the US holiday period and thank you for your interest in TI power management ICs. The correct implementation for your compensation is shown in the data sheet example. Here is a link to SLUA671 that gives a straight forward explanation for using the TL431 as a type 2 compensator in a CMC DCM flyback.

    Regards,

    Steve M