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LM25118: Generic approach for 12V, 24V, 30.5V output requirement

Nidhi P Shetty
Intellectual 735 points
Part Number: LM25118


Hello

I'm using LM25118 in my project. My customer requirement is to get 12V, 24V, 30.5V @ 2A from a input supply of 9-30V. I need to design a generic circuit for this requirement so that I can do changes in component during assembly and with respect to layout it should remain same.

Please help me out in this concern.

Regards

Nidhi P Shetty

  • 0
    TI__Mastermind 21720 points
    Hi Nidhi,

    To help with the calculations please use the LM25118 quick-start calculator at the link below. This will allow for easy calculations and basic component selection.
    www.ti.com/.../snvu065

    The best approach would be to start with the 24V output case and complete the design, then change the output voltage accordingly and see if the component selections is correct. Please note that this is an iterative design process. It will most likely take a couple times of running through the calculations.

    To change the output voltage the lower feedback resistor can just be changed by utilizing MOSFETs and resistors.

    Let me know if you have any questions.

    Thanks,

    Garrett
  • 0 in reply to Garrett Roecker
    Intellectual 735 points

    Hello

    Thank you for replying.

    I'm using the same calculation sheet. My customer want simulation results as well. When I checked in TI simulation WEB BENCH tool I found difference in circuitry (ex: Cvccx ). How can get simulate it with general requirement so that if I change component output should change in a single simulation. Is there any other way to do this?

    Please help me out in this concern.

    Regards

    Nidhi P Shetty

  • 0 in reply to Nidhi P Shetty
    TI__Mastermind 21720 points

    Hi Nidhi,

    I don't believe the WEBENCH simulations will support the variable output voltage designs. I suggest using either the TINA or the SPICE model for your simulations. These models can be found here.

    Thanks,

    Garrett