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I am using the LM2576HVT-15/NOPB in one of my designs. I am trying to simulate the 15 volt version hence the "-15" in the part number. There is also a 3.3 V, 5 V, 12 V, and an adjustable output version for this same part number. I downloaded the spice model, but I don't understand how I get the 15 volt output version because there is only 1 spice model to download? How do I simulate the 15 volt output specifically and not one of the other versions?

I downloaded it and tried to simulate it as seen in the screenshot below, but it doesn't seem to be working.

enter image description here

Am I just simulating it wrong? Do I need to change something in the .LIB file so it will be the 15V version?

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    \$\begingroup\$ Node references are meaningless in your picture \$\endgroup\$
    – Andy aka
    Commented Jul 28, 2023 at 12:56
  • \$\begingroup\$ If you are lucky, you can edit the model in plain text and just change 15 to something else and get reasonably close for your needs. \$\endgroup\$
    – winny
    Commented Jul 28, 2023 at 13:05

2 Answers 2

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"3.3 V, 5 V, 12 V, 15 V?" Usually, I can get the SPICE for the -adj version and add two resistors on the FB pin to make the version I want. If you have the -adj version and use it with out resistors it will try to output 1.235V. enter image description hereDigiKey

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The model LM2576HV_TRANS is for the 1.23V adjustable version only, so just add two resistors as per the datasheet to get the required output voltage.

eg. 10v out:

enter image description here

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