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UCC25600: Isolated DC DC Converter 400W design

vikas salvi
Prodigy 170 points
Part Number: UCC25600
Other Parts Discussed in Thread: UCC256303, UCC256403

Tool/software:

Hello Experts , 

I am designing Isolated DC/DC with below specifications . Please suggest suitable topology and reference design if available 

input voltage : 70 ~ 135V dc  ( nominal : 96V ) 

output voltage : 14.5 V 

Load current : 27 A 

efficiency : 95 %

isolation : 1.5 KV 

Thank you 

  • 0
    TI__Guru 50190 points

    Hi Vikas,

    Our newest LLC the UCC25660 can support this. To get the efficiency around 95%, you may need to use GaN like our LMG2650. 

    I hope this answers your question.

  • 0 in reply to JCHK
    Prodigy 170 points

    Hi JCHK , 

    thanks for your feedback , i have couple of questions ,

    can we use UCC 256303 instead UCC 25660? 
    considering 27A current need to use synch rectification on secondary , is there any LLC controller with integrated synch rectifier driver ?  Is any other topology (low cost ) suitable for this application other than LLC ? 

    thank you ,

    vikas

  • +1 in reply to vikas salvi
    TI__Guru 50190 points

    Hi Vikas,

    The UCC256303 is NRND and the UCC256403 can drop in with a minor BoM change. The UCC256603 is the latest generation which has the following advantages:

    1. IPPC - input Power Proportional Control - This makes it far less sensitive to input voltage variations causing  the burst mode threshold and over load power threshold from shifting as a function of the input voltage

    2. Self regulated soft-start - This can never be fooled into premature exit from softstart

    3. 750kHx resonant frequency - This can help you increase power density by minimizing the magnetics.

    As far as an LLC with an integrated SR driver, not yet. Our closet option here would be a phase-shifted full-bridge UCC28950. This directly drives the SR FET's/

    I hope this helps.