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OPA333: OPA333 PSpice Model

Shang Wu18
Intellectual 270 points
Part Number: OPA333
Other Parts Discussed in Thread: TINA-TI

Tool/software:

Hi,

I'm having issues with some TI PSpice models. OPA333 for example, it works fine when I connect it to a negative supply. However, when I ground the negative supply, it wouldn't converge & takes long time even though the datasheet show it can be operated in single-ended.

Any clue on this?
Thanks a bunch.


  • 0
    TI__Genius 11185 points

    Hi Shang,

    I see that you have a split supply on the schematic that you sent. Could you please share your schematic with single supply where the simulation fails to converge? It would be helpful if you could send your PSpice file here. In addition, what kind of simulation are you running? Are you running a DC sweep?

  • 0 in reply to HO SIU
    Intellectual 270 points

    Thanks for your quick response. Here's the schematic with single supply. Yes, DC sweep.

    OPA333.dsn

  • 0 in reply to Shang Wu18
    Intellectual 270 points

    DC Sweep from 0.1V to 1V, 0.01V resolution.  PSpice files are here.
    OPA333.zip

  • 0 in reply to Shang Wu18
    TI__Genius 11185 points

    Hi Shang,

    I took a look at this and the simulation had convergence issues for me as well. We've seen this issue before, and it seems like this issue usually only occurs on the PSpice simulator. I built the same circuit on TINA-TI and the simulation ran without convergence issues as below:

    OPA333DC_SWEEP.TSC

    Please note that the low end of your DC sweep parameters goes below the output voltage swing of the OPA333, which is why the simulation result isn't linear across the full range of your DC sweep:

    I'm hesitant to make any edits to the .lib file as there was a case previously where it had an unintended effect of causing more errors in PSpice.

    I'll go ahead and try to make alterations to the Analysis Parameters on PSpice to see if it helps the simulation converge.

    For the time being, a solution would be to use TINA-TI to do the DC analysis you require.