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TINA/Spice/UCC256304: - no model available to simulate new PSU design - please provide SPICE model

Part Number: UCC256304

Tool/software: TINA-TI or Spice Models

Dear Sir/Madam,

Please can I have a SPICE model for this component to aid in the design of a power supply?  The only model that I can find is an encrypted SIMPLIS model and I am unable to use it because the free version of SIMPLIS does not support use of encrypted models.  (SIMPLIS is not part of our standard suite of software and we do not design enough power supplies to warrant purchasing it.  We always design with SPICE and we have always obtained sufficient results using SPICE and it is an environment in which our development engineers are comfortable.  Therefore we have no interest in purchasing SIMPLIS.  If no SPICE model is available, the free version would be an option - but the encrypted models do not work in the free version)  Now I am left without any way to model the circuit...  Please help...  How can I model my power supply for which I would like to use TI's UCC256304 as the controller?

Best regards,

Brendon

5 Replies

  • Hello Brendon,

    The only available model, is SIMPLIS, and as you mentioned, the free version of SIMPLIS is not capable of simulating encrypted SIMPLIS model. There is no plan to work on SPICE model for this part in the near future and the un-encrypted model can not be release unless there exists a NDA for the company that is requesting the model. You can contact the TI field engineer for your company to get further assistance with NDA.
    The other approach can be finding a similar part that has PSPICE model available.

    Regards,
    Arash
  • In reply to Arash Loloee:

    Hi Arash,

    My sincerest gratitude for your comprehensive reply. There are usually issues with the company that I work for insisting that their NDA be used while TI would probably insist that their NDA be used - deadlock. I appreciate your suggestion of using a SPICE model for a similar part - please could you recommend such a model?  Even if I could simply model the core functionality (frequency control) of the LLC switcher (without all the other specialised features offered by the UCC256304) I would be happy.  This would give me confidence in the design of my transformer, resonant inductor, choice of switches, caps, etc.

    Thanks so much!

    Brendon

  • In reply to Arash Loloee:

    Please provide a SPICE model for a similar/equivalent LLC controller that I would be able to use to test the core functionality (i.e. voltages,currents & power for the isolation transformer, resonant inductor, primary and secondary hold-up capacitors, secondary rectifiers, MOSFETs) in SPICE of a circuit based on the Texas Instruments UCC256304.  I understand that you will not provide a SPICE model for UCC256304.  Please do provide a SPICE model for a another similar LLC controller that would generate the switching signals for the FETs and control the feedback in a way similar to UCC256304 so that I can evaluate the core functionality of my LLC ciruit.

  • In reply to Brendon Bentley:

    Hi Brendon,

    While I develop models for  devices, I  can not comment on which I.C. is the best alternative for your case.

    There are many controllers on TI website. Many of those have encrypted PSPICE models. You can see if those work for you. In general , I would search the site for parts of interest with specific keyboards ( controller, Flyback,  and....)  then from those you can see which are close to what you need and whether or not they have PSPICE model ( even though most probably  their models are encrypted)

    I hope this helps you to find the part that you are looking for. I am closing this thread but if you have any question you can reply back.

    Kind Regards,

    Arash

  • In reply to Arash Loloee:

    Hi Arash,

    Sincerest thanks for your reply. Although your replies are informative it fails to address my issue. I lodged this query because I was unable to verify my design with UCC256304 - even at the most basic level (i.e. in steady state operation) - by simulation. I need to do this to verify the choice of components peripheral to UCC256304. By my reckoning it is the responsibility of the manufacturer (who has insight into the inner workings of their components unlike me, the user, who only controls the peripheral components) to provide a simulation model. I am not in a sufficiently informed position regarding how UCC256304 works to make a decision regarding which model might be suitable. After your replies I am still in exactly the same position - unable to verify my design by simulation. In the light of this my issue remains unresolved.

    Perhaps TI should consider how it expects customers to design more complex resonant power supplies if there are no models available for simulation with free software. Surely this approach is eliminating a large section of your market? As a design engineer (for a global SATCOM company) who favours TI components because of years of good experience and someone who has come to appreciate that TI's datasheets are mostly complete, accurate and helpful and models are reliable and bring insight through simulation this experience has been quite negative.

    Sincerest thanks for your attention,
    Brendon

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