LT Spice Error: don't know how to detect the circuit's steady state

Discussion in 'General Electronics Chat' started by Xander Amato, Sep 15, 2016.

  1. Xander Amato

    Thread Starter New Member

    Aug 31, 2016
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    I am building a circuit for a university project. I am at the simulation phase, and I a using LTSpice. On running the simulation it gives me the following error.

    don't know how to detect the circuit's steady state

    Here is my circuit,
    LT Spice Circuit Assignment 6.PNG

    So the idea is to use an opto-couple 4N25 to protect the micto controller, switching a IRF3205 Power MOSFET. I am a newbie to LT Spice.

    Thanks
    Xander
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
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    Can you post the .asc file. I'm way to lazy to redraw it.:D
    I'm trying to understand why the V2 symbol is so small. Might also try a FET from the standard library.
     
  3. eetech00

    Active Member

    Jun 8, 2013
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    V2 might not be recognized as a voltage source. Try using a voltage source component, like V1, using the component selector.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Uncheck the 'steady state' box in the Edit Sim Command dialog box.
    Also, your .tran command includes the 'step' command but your circuit has no current source which can be stepped.
     
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  5. Xander Amato

    Thread Starter New Member

    Aug 31, 2016
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    Thank you for your time,
    @ronv I am attaching the .asc file.
    @eetech00 I tried using a signal source for V2 using a DC signal of 12V, the error persists.
     
  6. Xander Amato

    Thread Starter New Member

    Aug 31, 2016
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    I am attaching additional files
    the Mosfet used .model
    Mosfet Datasheet and THe Opto Datasheet.
     
  7. Xander Amato

    Thread Starter New Member

    Aug 31, 2016
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    Thanks for your advice I was able to run it!
     
  8. ronv

    AAC Fanatic!

    Nov 12, 2008
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    Yes, remove the check box to stem current source.
    I think I would also remove the maximum time stem of 1 ms.
     
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  9. Xander Amato

    Thread Starter New Member

    Aug 31, 2016
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  10. Xander Amato

    Thread Starter New Member

    Aug 31, 2016
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    Thank you for everyone's time I will add any other queries. For now I am good.
     
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