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PSPICE FOR TI: How to Obtain Additional Parts from the Cadence PSpice Model Library

Thomas Foxcroft
Expert 2996 points

Version 17.4-2023-S009

After installation of PSpice for TI, I noticed that not all parts from the Cadence PSpice Model Library are included. For example, under the Passive category there is only one transformer part installed while the library published at pspice.com offers twelve transformer parts. I cannot find instructions at pspice.com about how to get those parts.

  • Are those parts not part of the PSPICE FOR TI license?
  • If they are available, how can I get them?
  • 0
    TI__Mastermind 20460 points

    Hi Thomas,

    The commercial version of PSpice has a more extensive built in model library. You can download models to include, but if they contain junctions (diodes, transistors, etc.) then it will trigger soft landing where you are limited to 3 markers.

    If it is a behavioral model, then you can include those in the design without any problems.

    Can you give me an example of a transformer part # and I'll take a look?

    David

  • 0 in reply to David Larkin
    Expert 2996 points

    Hello David:

    I'm responsible for writing firmware for microcontrollers, and now I am responsible for developing the circuits which interface those devices, so I'm using PSpice for TI, but I am a novice at using that tool. My learning starting point is at supplying power from AC sources. I want to get some experience in using that tool for developing AC to DC conversion circuits, and then move on to implementing the power solutions which your company supplies.

    In the Cadence PSpice Model Library, under the Passive category, is a subcategory of Transformers, and in that subcategory are twelve transformer parts. Your PSpice for TI only provides one of those parts, and it is called XFRM_LINEAR. Are you saying that PSpice for TI does not supply, or come with, the remaining eleven transformer parts?

    I'm also not familiar with the terms junctions and soft landing, so I don't understand the dependencies which markers have on those things.

    And then you say "If it is a behavioral model, then you can include those in the design without any problems." I don't understand that, so could you please elaborate a bit? For example, is a behavioral model a circuit simulation or the characterized behavior of a specific part?

    If you could supply some of those transformer parts, I certainly would be interested. For example, I would be interested in all eleven.

    Sincerely,

    Thomas

  • +1 in reply to Thomas Foxcroft
    TI__Mastermind 20460 points

    Hi Thomas,

    There are a number of basic training modules for PSpice for TI. As a new user, I encourage you to review all of those. They cover the basics such as DC, AC, transient along with monte carlo, sensitivity analysis and importing external models. In that section, the video discusses the 'soft landing.'

    The training is towards the bottom of the PSpice page. https://www.ti.com/tool/PSPICE-FOR-TI

    Cadence also hosts training for PSpice for TI. https://www.pspice.com/pspice-for-ti/training-course

    https://www.pspice.com/pspice-for-ti

    https://www.pspice.com/pspice-for-ti/training-videos

    In order to promote TI devices, and protect Cadence IP, this version limits analysis to 3 probes (markers) when an external transistor based model is detected.

    A behavior model is a mathematical model. e.g. V=IR is a simple example. Transistors are recognized as having a PN junction. Diodes, CMOS, NMOS, PMOS, BJT, JFETs are all examples of devices with PN junctions.

    PSpice for TI only has 1 transformer. I did a quick search and did not find PSpice models for transformers. I did find some resources on how to create a transformer model for SPICE but I'm not sure how this would work with PSpice for TI.

    https://resources.ema-eda.com/ema-blog/how-to-create-transformer-spice-models-2

    Sincerely,

    David

  • 0 in reply to David Larkin
    TI__Mastermind 20460 points

    Hi Thomas,

    I also saw your other post where you were able to combine 2 inductors for form a transformer.

    Does this resolve your problem?

    May I post/promote your solution as general guidance for other users?

    Regards,

    David

  • 0 in reply to David Larkin
    Expert 2996 points

    David:

    Thank you for answering my questions, I'll view the tutorials, and you may promote that procedure I wrote.

    -Thomas

  • 0 in reply to Thomas Foxcroft
    TI__Mastermind 20460 points

    Hi Thomas,

    One other thing. I checked a couple of manufacturers of transformers. Some, such as Wurth and Coilcraft, have SPICE models for their devices. I'm sure those will be specific to the device rather than configurable.

    Seems hit or miss though. I didn't get a hit for SPICE at Hammond.

    David

  • 0 in reply to David Larkin
    Expert 2996 points

    David: Thank you for the extra insight. Every little bit helps.