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WEBENCH® Tools/UCC21222: trouble with UCC21222 gate driver simulation in TINA-ti

Dominic Meads
Prodigy 30 points
Part Number: UCC21222

Tool/software: WEBENCH® Design Tools

Hello All! 

New to TINA ti and i am trying to simulate the UCC21222 gate driver. I have followed the design notes in the datasheet here: http://www.ti.com/lit/ds/symlink/ucc21222.pdf

I have made the circuit in TINA with IRFZ44N channel MOSFETs. I followed the application schematic on pg 25 in the data sheet. 

I have my input logic waveforms set correct and I imported diode models from other vendors. I made sure all N.C. pins are grounded. 

The problem is, there is no output on the gate driver. 

When I imported the UCC21222 spice model directly from the TI website, http://www.ti.com/product/UCC21222/toolssoftware,

I was only able to choose one .SUBCKT part even though there are many in the file ( i belive they are all related, not just different circuits, but are part of the internal IC structure). 

Could this be the problem?

Additionally, I have not figured out how to make an isolated ground in TINA, and the UCC21222 calls for isolated ground in the datasheet. Could this lead to simulation problems? If so, then how do you make an isolated ground?UCC21222_driver.TSC

I have attatched my .TSC file for anyone to view. 

Thanks!

  • 0
    TI__Prodigy 650 points

    Hi Dominic,


    Thank you for your question. I work on the applications team in the high power drivers group.


    In your design, UCC21222 has very strange pin outs. This may be a result of how you imported it into TINA as you described. The pins are hard to follow with labels that don’t seem to correspond with their function and VCC is grounded.


    Here is a guide on how to import our PSpice models into TINA. Be sure to install the “Unencrypted PSpice Transient Model” for this process and use the UCC21222-Q1_TRANS for your macro.

    https://www.ti.com/lit/an/slva527/slva527.pdf

    As for your question about creating an isolated ground, you can create two ground domains and place a voltage source between them.


    If this answered your question, could you please press the green button? If not, feel free to ask more questions.


    Thanks and best regards,
    Zach

  • 0 in reply to Zachary Wellen
    Prodigy 30 points

    Hi Zach,

    Thanks very much for your reply! I hope your day is going well. 

    I imported the new model and used a different shape. For a few minutes it worked okay, but not when I run transient analysis, it says "convergence error"

    I tried messing with some of the analysis parameters with no avail. 

    The problem is not the diode model because It worked a few min ago with them. 

    The convergence error says the problem is with U1 which is the UCC21222 in my file. 

    I will attach the new update file. Thanks.

    Dominic. 0815.UCC21222_driver.TSC

  • 0 in reply to Dominic Meads
    TI__Prodigy 650 points

    Hi Dominic,

    You should look at altering the TR minimum Time Step parameter to a larger value, around 1ps.  If you still get the convergence error, ignore it and let the simulation continue.  Sometimes there is some high frequency noise in these simulations that can cause the convergence error.

    If this answered your question, could you please press the green button? If not, feel free to ask more questions.

    Thanks and best regards,

    Zach

  • 0 in reply to Zachary Wellen
    Prodigy 30 points

    Thank you very much Zach. This really helped me out. 

    For anyone else who comes across this forum, this is what i did.

    downloaded the un-encrypted PSPICE model for the UCC21222. 

    USE THE AUTOGENERATED LAYOUT. 

    I changed the minimum timestep paramaeter mentioned above to 1 ps.