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OPA855: OPA855 - Trouble running Pspice simulations

Romain DENIS-JUNG
Prodigy 10 points

Part Number: OPA855

Hello,

I’m having trouble using the OPA855 PSpice model downloaded from the Texas Instruments website.

Even with very basic test circuits (for example a simple non-inverting amplifier), the simulation results don’t make sense. In some cases, I get an output voltage of ~8 V, while the amplifier is powered from a single +5 V supply (VCC = 5 V, VEE = 0 V).

I’ve checked that:

  • the subcircuit is instantiated correctly (OPA855 IN+ IN- OUT VCC VEE),

  • the supply voltages follow the datasheet,

  • the inputs are kept within a reasonable range.

Still, the output clearly exceeds the supply rails.

Is there a recommended or validated PSpice test schematic for the OPA855, or any special considerations when using this model in PSpice?

Thanks in advance for your help.

Best regards,

Romain.

  • 0
    TI__Mastermind 31825 points

    Hello Romain,

      Thank you for the details. If you are using PSpice for TI, would you be able to try out placing the symbol directly from the library:

      If using a different version of PSpice, can you try the attached PSpice project below, and let me know if that works on your end.

    sbomb43d.zip

    Thank you,
    Sima