LT Spice Question

Discussion in 'General Electronics Chat' started by killivolt, Sep 29, 2013.

  1. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    Building a circuit, first time I've ever used it. However, I need a SG3525n Mosfet Dual Driver, a 12v Zener, and a 1uf MKP. There not in the Database.

    How do I get another source for those parts and add them to the .net.

    Thank you.

    kv
     
  2. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    Someone else said, I probably won't find it anywhere. So, I thought maybe it could be done by simulating the Frequency, of the PWM Chip.

    This is the Datasheet, well above my head. Any Suggestions.

    Thank you.

    kv
     
  3. crutschow

    Expert

    Mar 14, 2008
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    Look here for the SG3525 model.

    There is a 12V zener model (BZX84C12L) in the diode library.

    Don't know what a MKP capacitor is, but the standard capacitor model will likely work.
     
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  4. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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  5. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    The MPK is a standard metalized poly cap. If I remember right on your schematic, the MPK cap didn't make sense where it was. Since it is in series, on a DC part of the circuit. Thought caps blocked DC?
     
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  6. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    My Mac won't let me View the Netlist, So I can't copy and paste the file.

    Stuck again, I seen some programs out their but they look dated.
     
    Last edited: Sep 30, 2013
  7. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    The MPK is a non-polarized Capacitor, it doesn't care which way the voltage goes, it will pass it.

    I would need correction but, that's what I think I know.:)

    The author of the schematic I'm following, claims it helps with kickback from the flyback. I don't know if that's true or not, because his original schematic doesn't work.

    kv
     
    Last edited: Oct 1, 2013
  8. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    FYI, if your new to Mac, I learned something today, while trying to get these files to .sub and .sym

    With the release of Lion they are hiding Library by default, in order to get to it and have the correct file path you, use finder/ and go in the header, click go/ in the drop down you'll see Computer, depress the option key and Library will appear.Click Library to select and follow the path of folders.

    In order to see the correct path in LT Spice, Go to the Schematic and right click find Component/ you will have the display component list at the top of it, will show your file path to place it in .sub and .sys
     
    Last edited: Oct 2, 2013
  9. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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  10. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    I'm told by (others) to just deal with the labeling, I'm ok with that:)

    No reward I guess, because you'd have to totally reprogram.

    Thanks again, Sgt.

    kv

    Edit: I'm just glad I have it:)
     
    Last edited: Oct 2, 2013
  11. SgtWookie

    Expert

    Jul 17, 2007
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    I labeled the pins as I did for several reasons; try to keep the inputs on the left and outputs on the right; supply voltage on top and ground on the bottom; and try to keep the symbol from getting overly large by keeping the pin names abbreviated yet meaningful.

    It's not perfect, but it's a reasonable compromise. I'd have to have a pretty compelling reason to change it, as I'd have to re-work any LTSpice .ASC file I'd created in order to use a modified symbol; which I really don't have time to do.
     
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  12. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    Thank you, I didn't realize how much simpler it was until I actually began to route them.

    I said, to myself, he did it to make it easier. I used the Data sheet and labeled accordingly. It was simple.

    Thanks for all you do. You saved my Schematic, and when I found out you were the author, it was even better.

    kv
     
    Last edited: Oct 3, 2013
  13. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    This is one I think may be able to run, but I have the free version and I can't run it.

    Could someone check it out and let me know, what you think.

    Thank you,
    kv
     
  14. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    I guess I don't have it setup correctly, I don't have any symbols to setup Run Directives.
     
  15. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    If you have the latest version of OS X 10.8.5 you may have trouble, I do have VM ware, I didn't want to use it, because it was running so smooth on the Mac.

    Although, it didn't have a toolbar, I sent them info of the problem. However, the newest update was for Windows I hope they will update the Mac side as well.

    If the Version of LT Spice is not the same as your Mac OS X it will not be the same as a Windows OS. You will not have the same control. It builds but Capacitors and things are very different, you don't have the same controls.

    Plus, like me not toolbar to say the least. I'm going to have to draw the hole thing in Windows. That way I can see all the differences.
     
    Last edited: Oct 8, 2013
  16. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    So, I'm able to run a simulation in Windows, now this is what I've gotten so far.

    When I run the simulation "Transient" at 100ms I don't have the second window.raw to test points in the circuit.
     
    Last edited: Oct 11, 2013
  17. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    You don't get that until the sim has progressed a fair way (progress is shown at the bottom of the .asc window). Did you fail to get the .raw screen even after the sim had run 100%?
     
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  18. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    Ok, I'll let it churn through, I do see something happening in the bottom left corner.

    I'll let you know.

    Thanks,
    kv
     
  19. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    Got it running finally. I was using the previous Rev. 4.1 instead of my 4.1.1.

    Thanks again.

    kv
     
  20. killivolt

    Thread Starter Active Member

    Jan 10, 2010
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    Now I have the Mosfets doing something, what I'm not sure because the SG3525 is not oscillating, but if the SG3525 is not oscillating how is it possible for me to see 206 + Amps on both Mosfets? Of course in the real world that would melt them down. I played around the circuit and put the 22ohm resistor in series with the Gate which seemed to change things, what I'm not sure at this point.

    My question is Why isn't the SG3525 no oscillating? What am I doing wrong, I'm to new at this and I can't edit the Sub, I'm a newbie.

    Here is Rev4.4

    Edit. I'm not sure what's going on, this runs perfectly on my machine but, when download it, it's just a ,txt? yet it shows on the site as .asc? weird.

    Can someone try this and see if it's doing the same thing to you?
     
    Last edited: Oct 12, 2013
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