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UCD3138ACCEVM149: Using UCD3138A with LMG5200

Jerry%20Leung
Intellectual 905 points
Part Number: UCD3138ACCEVM149
Other Parts Discussed in Thread: LMG5200, UCD3138A, UCD3138OL64EVM-031, , UCD3138CC64EVM-030

Hello,

I have a customer developing a 54V to 0.9V PoL module for their ASIC.  Our customer has been previously advised by our GaN team to use the UCD3138A with the LMG5200.  As there are various versions of the EVMS, he is wondering which would be the most appropriate one to use.  Please see the description below:

“Looking through UCD3138A eval boards, it seems like the description for ) UCD3138ACCEVM149 is what I want, but that one is lacking any additional information, while all the others look like proper TI part pages (i.e. technical docs, pictures, etc.).  Another possibility is the UCD3138CC64EVM-030, which doesn’t seem to be sold standalone.  But it looks like it is designed to interface with a second board, which we would replace with the LMG5200 EVM, I am sure it would come pre-programmed with a program that wouldn’t work for us, but I can overwrite that.  The final choice is the UCD3138OL64EVM-031 (or possible the 48-pin version).  This is very general purpose, but I am not sure if I’ll be able to get high-enough quality signals off of it to drive the LMG5200 since it seems to send all output to headers, and it appears is mainly intended to evaluate without an output phase.”

Here are the customer's requirements just for reference:

  1. 54V nominal input (could be slightly higher or lower)
  2. 400A total output at 0.75V
  3. Very low profile and narrow footprint, but with unlimited depth
  4. High frequency (to get the very low profile we need inductors to have ~100nH or less), looking for 1MHz minimum, but preferably 2MHz

Thanks for the help and best regards,

Jerry

  • 0
    TI__Genius 17090 points
    Jerry, the only reason we used the control cards, like the UCD3138CC64EVM-030, is because we wanted to use one EVM with all the different UCD family members. You could use it for the same reason, but it seems easier to just layout the UCD footprint and support on a main board. Same thing with the LMG5200. Unless maybe you're trying to just cobble up a very low power proof of concept, hooking a control card and an LMG5200 EVM up to a power board switching 400 amps at 1 or 2 MHz seems like a dangerous proposition. With all those really fast edges, you're going to need some very careful layout and filtering. Also, the UCD control cards are designed to be installed at right angles to the main board, so that doesn't give you a low profile.
  • 0 in reply to Ian Bower
    TI__Intellectual 1270 points
    Hello Jerry,

    Were you able to conclude to a specific EVM or reference design ?

    Thanks,
    Sanatan
  • 0 in reply to Sanatan Rajagopalan
    TI__Genius 17090 points
    I'm closing this since no response. Also we have made a recommendation to add the UCD hardware to the rest of the board for the power supply