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TINA/Spice/UC2842: UC2842 spice model

Mike Sharafati
Prodigy 30 points
Part Number: UC2842
Other Parts Discussed in Thread: TINA-TI, , UCC28C42

Tool/software: TINA-TI or Spice Models

I could not find the flyback transformer type that is used in the current mode switching supply that I wanted to simulate in TINA. All transformers use the same phase dots and I could edit a transformer to give me an out of phase response (reverse phase dots). So I tried to import the pspice model for the TI switcher part (uC2842) into LTspice. However, I found out that the model is encrypted. Could you please provide me with an unencrypted version of the model? Thanks.

  • 0
    TI__Genius 9775 points
    Hi Mike,

    The unencrypted model was published here on the part's website:
    www.ti.com/.../toolssoftware

    Herman
  • 0 in reply to Herman Theodorus
    Prodigy 30 points
    Thanks for the file, but it has not resolved my issue yet. I used the unencrypted model that you sent me for the UC2842, but I still get the same message that the subcircuit is empty when I run my simulation!
    (Expanding empty subcircuit: ucc28c42)
  • 0 in reply to Mike Sharafati
    TI__Genius 9775 points
    Hi Mike,

    I am able to run the simulation and there is no problem with the unencrypted file. Unfortunately, we cannot help you on LTSPICE specific issue due to legal boundary of using LTSPICE vs. TI's model.

    The only thing I can say is that for any type of simulators when it says it cannot find the subcircuit, just make sure that your symbol is calling the right name or the right file within the unencrypted file. For instance to check whether you have have the right symbol and subcircuit calling correctly, you can use our unencrypted file and try to add dummy .SUBCKT inside that unencrypted file.

    For instance you can add
    .SUBCKT RC A B
    R1 A B 1k
    C1 B 0 1p
    .ENDS

    then try to alter the symbol calling temporarily to RC subcircuit and let's see if you can run the simulation, etc, etc.

    Alternatively, you can also try to check your confidence on the unencrypted file by creating a symbol within TINA-TI and run dummy simulation within TINA-TI first. Once you have the confidence that the unencrypted file is good to go, then you can always try other simulators.

    Again sorry that I cannot help you with LTSPICE specific.

    Herman