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TINA/Spice/OPA180: Simulation model showing following Error : Overflow, converge

Part Number: OPA180
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

OPA180 simulation model showing "Overflow, converge" while Pspice simulation. Request support.

  • Hello Di,

    Convergence issues with Pspice simulators are not all that uncommon. It might be something with the way you arranged your Pspice circuit, or something about a simulation model design that results in convergence difficulties.

    If you are using Cadence/Orcad Pspice there is a blog about using the AutoConvergence feature which may help you get past the convergence problems. You can find the blog here:

    Just for a reality check I ran our OPA180 simulation model using the TopSPICE simulator software and didn't encounter even the slightest convergence issue. TopSPICE is syntax compatible with Cadence Pspice. Shown below is an example of a transient analysis performed using the OPA180 simulation model.

    If you continue to have convergence problems, you can send us an image of your Ppsice circuit design and we can look it over.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • Thank you , I wasn't aware of the AutoConverge function!

    If I might add, often convergence problems are caused by the lack of initial conditions.
    www.youtube.com/watch

    Additionally, the simulator would tell you when (time) the convergence error happened.
    You could probe the voltage nodes right before and see if the values are what you expected.
  • Hi Al,

    Indeed, setting initial conditions (.IC) and node sets (.NODESET) are additional tools that can be applied when encountering convergence issues.

    Thanks for the tips!

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • Hi Di,

    Does this take care of your OPA180 model questions? If so, please close this E2E inquiry.

    Thanks, Thomas
    Precision Amplifiers Applications Engineering
  • Di

    We haven't heard back from you so we assume this answered your question. If not post another reply below, or create a new thread if this one has timed-out.

    Thanks
    Dennis