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UCC25600: Series-Parallel resonant converter (LCC)

Biswajit Bose
Prodigy 30 points
Part Number: UCC25600

Hi!

Using the UCC25600, I'm planning to implement a LCC converter with a PFC pre-regulator and a secondary side CC control, with CV only as a OVP. The resonant tank I've designed, is supposed to operate from max to no load between 190-300KHz. Is there any extra precaution I should consider while implementing a LCC (as opposed to a LLC) with this IC. I have experience designing several LLC designs, but with NXP or ST parts. Would love to get hold of an application note specifically for LCC. Else, any user experience, extra-precautions, with respect to LCC would be very helpful.

  • 0
    TI__Intellectual 2910 points
    Hi Biswajit,

    Thank you for your interest in TI solutions for your LCC application. We have contacted an applications engineer for the UCC25600 to help with your inquiry. Please allow a business day or so for a reply -- note that it is already mid-day in the US, and Monday is a national holiday. Your patience will be appreciated.

    Regards,

    - Daniel
  • 0
    TI__Mastermind 25590 points

    Biswajit,

    I've taken a look at LCC but, as this is a complicated topology, I can only really give general advice until I know more.

    In my experience:

    1. You generally want to operate just above the higher resonant frequency (from Ls and the combination of the C's) to take advantage of the steep gain curve.

    2. You want to minimize the parallel capacitance to reduce circulating current losses.

    3. The output voltage will shoot up if you disconnect the load, so it's good that you have that OVP

    Would you mind telling us:

    A. Vin, Vout, Iout (value and/or range)

    B. More info about this opportunity.  Schedule, volume, customer?

    Thanks,

    -Sam

  • 0 in reply to Samuel Jaffe
    Prodigy 30 points
    Hi Sam,

    Thanks for the reply. I have already designed the tank components. My main query was about the the IC, and if it has any known quirks when used in a LCC control. I cant think of any though, but just to be sure since I'm using the part for the first time, I posted this thread.
    I can email you or any assigned person directly with more details; can I get in touch directly? Where I work, posting design details in public forums is frowned upon.

    --with regards,
    Biswajit.
  • 0 in reply to Biswajit Bose
    TI__Mastermind 25590 points
    Biswajit,

    From the feedback I've gotten, it looks like there aren't any part-specific considerations when using UCC25600 for LCC. If you'd like to discuss more, feel free to email me at samj@ti.com.

    -Sam