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TPSM843B22E: SPICE Models

FarronDacus
Intellectual 750 points
Part Number: TPSM843B22E
Other Parts Discussed in Thread: TPSM843820, TPSM843A22E, TPSM843A26E, , TPS543820, TPS543B22, TPSM843B22

Tool/software:

Hello:

I note that Texas Instruments has some new switcher modules that are major reductions PCB footprint from the prior generation.  That's very nice as a new design option, but there do not seem to be SPICE models available yet. 

The parts in question are:

  1. TPSM843820 with 8A output. 
  2. TPSM843A22E with 12A output.
  3. TPSM843A26E with 16A output.
  4. TPSM843B22E with 20A output.

My questions are:

1. Are the major reductions in area (these are only 5% to 20% the PCB area of previous parts) the result in new advances in 3-D assembly?  Are there new technologies in play like GaN and SiC?  I'm just curious about that because it does seem to be huge advances happening over a short period of time.  Is there anything published explaining these advances?

2.  Are SPICE models to be made available?  If so, when and in what SPICE package?  If PSPICE format, will they be unencrypted so that they can be moved to LTSPICE for better convergence and speed?  Will they be transient form so ripple can be simulated?  Will a linearized model also be available for loop BW and phase margin simulation?

3.  There is a "SIMPLIS" form model for the TPS843820.  This seems to be a linear approximation (cannot sim switching noise) within the SIMetrix simulator, which is yet another version of SPICE that TI is apparently getting into.  Is there a plan here for offering linear switcher models in SIMPLIS and not in the more common SPICE versions?

Thanks,

Farron

  • 0
    TI__Mastermind 20375 points

    The TPSM843820 uses the TPS543820 device and the TPSM843B22 uses the TPS543B22.  

    No gan or sic technology, size reductions are from compounding silicon improvements and the assembly technique. 

     The TPSM843B22 and TPSM843820 PSPICE release is supposed to be this month.   But in meantime, there is a PSPICE for TPS543820 or TPS543B22 transient.  No linear model at this time.  The pspice models are encrypted intended for pspice for ti.      Unencrypted models have made available in past on other devices with NDA. 

    The simplis models should be run in simplis mode, not simetrix mode.   One simplis model can support transient simulation and frequency response simulations.  The simplis model zip file has two test benches, but there is only one mode.  

  • 0 in reply to David_Daniels
    Intellectual 750 points

    Hi David:

    Thanks for the quick response. 

    I was recently simulating a design with the LT8638S using the unencrypted PSPICE model provided publicly by TI that I had moved to LTSPICE to use with the LTSPICE inductor models provided by Coilcraft.  No NDA was required.  If I would like to use an unencrypted PSPICE model where TI wants an NDA, will TI agree to an NDA upon request?  If so, how would I go about executing that?

    I have a bit of a problem with PSPICE in that I have OrCad standard with PSPICE, and Cadence licensing would not allow me to also install the TI PSPICE while my OrCad is installed.  Would you know if the encrypted models will run with the Cadence PSPICE, or are they specifically for TI PSPICE?

    Is the SIMPLIS simulator available for free download?

    Thanks,

    Farron 

  • 0 in reply to FarronDacus
    TI__Mastermind 20375 points

    A TSR that is assigned to the account will reach out regarding the NDA.     

    I am not sure if they will post here or use the information on the account to contact.   

    Regarding the Cadence PSPICE, we had have success with running the encrypted and unencrypted models in cadence, I do not recall which release of cadence pspice. 

    Unfortunately, the simplis simulator is not a free download from TI.   There is a version that is a free version called Simplis elements, but it does not run encrypted models and has limited number of nodes.

  • 0 in reply to FarronDacus
    TI__Prodigy 20 points

    Hey Farron, it’s great to meet you! I'm Sean Herrera, the account manager who will be in charge of setting up the NDA for you.

    TI has a standardized process of implementing NDA’s with our customers, and we would need to initiate an NDA through TI’s legal system. I first need some logistical information to get this started, and it would be best to take this conversation to email. Could you reach out to my email at s-herrera@ti.com? Alternatively, you can provide your email and I can reach out to your email instead. I didn't find a suitable contact email in your profile. Thanks in advance!

  • 0 in reply to FarronDacus
    TI__Mastermind 20375 points

    Farron, 

    You should receive friend request in the e2e system.   Please accept the request, once the request is accepted, I can email you through the e2e system with files.