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Web Bench

Dave Miller
Prodigy 40 points
Other Parts Discussed in Thread: LM3478, TPS40210

So what the current status of web bench?

I have been out of the loop for while.

Is it the place to do switcher design or is there a new place to check out designs?

I am working though a design and have found a solution using a LM3478.

The only issue is that the only two FETS suggested are unobtainium. I would like to run the number using another more readily available part. Can't seem to add custom FETS only passives. My big concerns are thermal in nature.

I send a support request a few days ago. No reply.

I would prefer not to wait weeks for a response. The longer I wait the longer time I have ot wait to bill customer. :-(

 

Thanks

Dave

  • 0
    TI__Intellectual 2930 points

    Hi Dave,

    WEBENCH currently does not have custom FET functionality, so those are the only FETs it can give you design analysis on at this time.

    If you can tell me what FETs you were wanting to test out though, maybe I can help you in your analysis. I would also need to know the design requirements you used in WEBENCH to recreate your design.

     

    Regards,

    Tommy Jewell

    WEBENCH Apps, Texas Instruments

  • 0 in reply to Tommy Jewell - WEBENCH Design Center
    Prodigy 40 points

    Thanks Tommy,

    If you send me an email with your address I can share the design file with you.

    I am substituting the TPCA8014-H with a FDD8647L due to availability.

    My concerns are with heat sinking requirements (or hopefully none required) on FET and Diode in the design.

     

    Thanks

    Dave

     

  • 0 in reply to Dave Miller
    TI__Intellectual 2930 points

    Hi Dave,

    Once again, thank you for your interest in TI solutions.

    I'm sorry about the lack of availability of the FETs  first chosen by WEBENCH for your design. After looking at the specs of the FET that you substituted, we found it to be a good addition to our library. Running your design again in WEBENCH should now return the FDD8647L as the first choice of FET for your solution and give you the analysis you were looking for.

    I hope this was helpful,
    Tommy Jewell
    WEBENCH Apps, TI

  • 0 in reply to Tommy Jewell - WEBENCH Design Center
    Intellectual 470 points

    I want to use the DMN6068SE N Fet in a TPS40210 low power boost converter. I ran Web Bench using a FET from your list that has the same RDS(on). Is this a close enough approximation?

    Can you add this FET to your Web Bench library?

    Martin Risso

    mrisso256@yahoo.com

  • 0 in reply to Martin Risso
    TI__Prodigy 540 points

    Hi Martin,

    The DMN6068SE N FET that you proposed can handle current up to 5.6A max. The TPS40210 is a high input/output Boost device that has a max current of 6A. Considering the current derate factor for your FET selection, the DMN6068SE N FET may not tolerate the 6A operation.

    Please let me know if you have any question or comment on this.

    --Hadi