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LTSpice Help

Discussion in 'General Electronics Discussion' started by Amar Dhore, Apr 11, 2016.

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  1. Amar Dhore

    Amar Dhore

    129
    12
    Dec 2, 2015
    Hello Everyone,

    I am new to the ltspice.
    I am trying to import a third party OPAMP (MCP6L04) into ltspice. I download the spice model and added in the SPICE directories.

    When I compile it, I am getting an error: "Analysis: Time steps too small; initial timepoint:trouble with node u1:21"

    I have attached a .asc file. I would appreciate any help. Thanks.

    --
    Amar
     

    Attached Files:

    Last edited: Apr 11, 2016
  2. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    Just tried it and it works for me. The OPAMP comes in as an OP37 not a MCP6L04?
    Adam
     
  3. Amar Dhore

    Amar Dhore

    129
    12
    Dec 2, 2015
    I updated the file. Sorry about that, I forgot to save the changes.
     
  4. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    Ok let me look.
     
  5. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    I don't know how good the model is. I got it to work by adding some series resistance to the power and signal sources. Also add the .options functions on the image I have posted.
    Adam

    SPICE.PNG
     
    Amar Dhore likes this.
  6. Amar Dhore

    Amar Dhore

    129
    12
    Dec 2, 2015
    Yaaay, it works.Thanks Adam. I am curious to know, How did you figure it out?
     
  7. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    You may find it works without the gmin options but I seemed to get a faster response by adding this. The other option can solve time-step too small issues by adding a very small delay to all the nodes. I have used this a few times before and it has helped.
    Adam
     
  8. Amar Dhore

    Amar Dhore

    129
    12
    Dec 2, 2015
    Good to know. I will keep it in mind. Thanks again.
    -
    Amar
     
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