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TINA/Spice: Setting Initial Voltage on Capacitor (or Current though Inductor)

John Buie
Prodigy 20 points
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

The generic capacitor C has a setting for initial voltage (accessed by clicking on the component), but it doesn't seem to do anything.  I set the initial capacitor voltage to a random value in a simple CR circuit with no source and expect to see the current decay while running a transient analysis.  Do I misunderstand this feature?  I have a similar problem with initial current through an inductor.  I think a could work around this by editing the macro model, but why doesn't this feature work as I expected.

My longer range goal is to use initial values to help kick-start a crystal oscillator, but whether this is the right approach or not, I'd like to understand this feature.

Thanks,

JohnInitial Capacitor Voltage.TSCInitial Inductor Current.TSC

  • 0
    TI__Intellectual 1040 points

    Hi John,

    If you want initial voltages/currents to work correctly in TINA-TI, then you have to do the following.

    1. If you are using "Calculate operating point" option for running the transient analysis, then go to Analysis --> Set Analysis Parameters --> Operating Point with initial conditions, make it as Yes.

    2. If you use "Use initial conditions" for running the transient analysis, then you can directly run the transient analysis without modifying the analysis parameter.

    In case you still face any issue, please resend the .TSC file as I was not able to open the earlier one.

    Thanks,

    Somen

  • 0 in reply to Somen Das
    Prodigy 20 points

    Hi Somen,

    That was it.  Thanks so much for your help.

    John