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  • TI Thinks Resolved

TINA/Spice/OPA2347: SPICE model problem

Part Number: OPA2347

Tool/software: TINA-TI or Spice Models

The SPICE model seems to be incorrect when doing a transient analysis. The S/R is way too small - around 10mV/microsecond in a unity-gain configuration. This aplies for the TINA-spice tool as well as other SPICE simulators. Measuring on a real-life unit gives the correct S/R - >0.17V/microsecond. The SPICE-model is version 1.0 fetched from the TI-website yesterday.

  • Hi Jorgen,

    can you show us your TINA-TI simulation with the file?

    Kai
  • In reply to kai klaas69:

    I have the TINA file here:

    OPA2347_transient_test.TSC

  • In reply to jorgen.olsen:

    Hi Jorgen,

    I agree with your analysis, sorry that the model doesn't work as expected. Reading the model file, it looks like it's really intended to model AC and DC characteristics and transient/non-linear behavior may not be modeled properly. This is quite an old model as well.

    If you share with us some information regarding the important parameters for your application, we should be able to find you a device which will have a good model as well as meet your needs. I'll start by recommending that you check out the TLV9002.

    Thanks,
    Paul
  • In reply to Paul Goedeke:

    The suggested part does not solve this issue for my simulation since our design is locked including the OPA2347.
    I shall have to rely on measurements.
  • In reply to jorgen.olsen:

    Thanks for letting us know Jorgen. My apologies that the model doesn't properly work in this case. You can rely on the datasheet values, they will be the most reliable indicator of the device's performance.

    I'll close this thread by marking "TI Thinks Resolved" - please post back if you have any questions while testing your device.

    Sincerely,
    Paul

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