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Hello everyone,
I’m trying to simulate the LM5149 in PSpice for TI 2024. I’ve downloaded the LM5149-Q1 PSPICE Transient Model from the TI website and followed the provided steps.
After loading the file, I opened the schematic and ran the simulation without making any changes. The simulation completes, but the output voltage is consistently 6V, even though the circuit is designed for a 5V output with a 12V input.
Interestingly, tweaking the feedback resistor values doesn’t seem to affect the output voltage—it remains at 6V. Furthermore, if I increase the input voltage (VIN), the output voltage (VOUT) always appears to be half of VIN.
As someone relatively new to PSpice and electrical simulation, I’m unsure if I’m missing something critical. Has anyone else encountered this issue or can suggest what I might be doing wrong?
Thanks in advance for your help!
Hello Micahel,
I downloaded the PSPICE model and ran it and it works on my end. Did you create a folder and unzip the file in that folder, and run the OPJ file?
Thats all I did and works fine, see below.
Hope this helps,
David.
Hello Micahel,
I had someone else test itwith the latest version and it works...
Please can you turn on the option to list model file see below.
This will show you where each model comes from in the .out file:
please share what you see.
Thanks.
Hello Michael,
I have easier path to resolve this issue, please can you reinstall library and download a fresh model file from the product folder and retry.
please refer to attachment.
Thanks.
David.
