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LM5100A: Simulation issue in Pspice

Hussam Hayrab
Prodigy 40 points
Part Number: LM5100A
Other Parts Discussed in Thread: UCC21540, , UCC25600, UCC27289, UCC21520, UCC21530

Tool/software:

To whom it may concern

 

We want to use UCC25600, but we have a problem in design because of LM5100A which is the gate driver of this IC. We have used PSPICE version for our simulations. When we dropped LM5100A and designed LLC in open loop, the efficiency has reached near 98%. When we inserted UCC21540 as an isolated gate driver for UCC25600 and designed LLC in closed loop, the efficiency has decreased to 96%. This condition is expected. However, when we used LM5100A for isolated gate driver with UCC25600, the efficiency has reached above 100%. This condition can’t be realized in real situations. We think there is a model error related with LM5100A model in PSPICE. Do you think another error condition about this? We have added the schematic screenshot by using LM5100A. We can share the other screenshots if it is needed. We would like to know your suggestions.

 

Best regards,

  • 0
    TI__Genius 9790 points

    Hello,

    The LM5100A is an older part and may have inaccuracies in the model. Can you share the efficiency calculations and waveforms? I also suggest trying the UCC27289. It is a newer part with the same pinout and functionality with some improved specs.

    Best,
    Walter

  • 0 in reply to Walter Zollinger
    Prodigy 40 points

    Hello,

    Thank you for your feedback

    I am sharing the related waveform below. We have used "AVG(W(R58)) / AVG(W(V13))" formula which represents Pout/Pin. We have efficiency above 100% by this way.

    Thank you for your IC advice. However, we need an isolated gate driver for our application. Can you suggest us an isolated driver instead of UCC27289? 

    We will be happy if you can check our design.

    Best regards,

  • 0 in reply to Hussam Hayrab
    TI__Genius 9790 points

    Hello,

    I'm adding the isolated team to this thread.

    Thanks,

    Walter

  • 0 in reply to Hussam Hayrab
    TI__Intellectual 2045 points

    Hi Hussam,

    We have several dual-channel gate driver offerings that can suit your needs in a half-bridge configuration. Please see this link to view our filtered product page for dual-channel isolated gate drivers.

    If you need more assistance in choosing the best gate driver for your application, please utilize this FAQ page, which covers the main differences for the different dual-channel isolated gate driver options. There are a few new gate driver offerings that are not listed on the FAQ, but I can provide comments on them:

    1. UCC2133x is most similar to UCC2122x, primarily due to package size, but with improved specs.

    2. UCC2155x is most similar to UCC21540, primarily due to input supply voltage, but with improved specs. UCC2155x is also similar to UCC21520 and UCC21530.

    Overall, I'd start by looking into UCC2133x or UCC2155x, because they are our latest-generation parts with improved specs over the previous generation. However if a larger input supply voltage rating is needed, I would recommend to look into UCC21520 and UCC21530 as a starting point.

    Best regards,

    Will