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PSPICE LED simulation

Discussion in 'Electronic Design' started by Boki, Apr 25, 2006.

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  1. Boki

    Boki Guest

    Hi All,

    I want to simulate LED, but there is no LED component in PSPICE (OrCAD)

    I use D1N4148, but the Vf is only about 0.7V, my co-worker tell me his
    LED is about 1.9V, how can I simulate it ?

    Right now, I can only series them, but the Vf becomes constant ( ex:
    3x0.7=2.1v )

    Thank you very much!

    Best regards,
  2. Usually, the .MODEL statement and the D type model. Something like:

    .model MYLED D(Ron=21 Vfwd=1.55)

    as an example. You'll need to use that model name for your LED in
    your schematic, as well.

  3. Pooh Bear

    Pooh Bear Guest

    Stick 2 x 1N4148 in series.

    1.9V is quite high for a red led at typical currents. Go read a datasheet.

  4. me

    me Guest

    So what's to simulate?
  5. Pooh Bear

    Pooh Bear Guest

    One does indeed wonder. A voltage drop it seems.

    This is what 'design' has come to - 'simulate' it in Spice instead of doing some simple
    maths is the order of the day. In the process it's clear that the simulator ( person )
    has no idea what's really going on.

  6. Boki

    Boki Guest

    me 寫�:

    ????? = = ????
  7. Boki

    Boki Guest

    Jonathan Kirwan 寫�:
    Great! but .. ... I don't know the file name in OrCAD PSPICE.... could
    you/any one please kindly advice?

    Thank you very much!
    Best regards,
  8. qrk

    qrk Guest

    Number of options here:

    1. Use LTSpice. They have a generic LED in the base library.

    2. LTSpice has models for red and white LEDs. Look for NSPW500BS,
    QTLP690C, LXHL-BW02 which can be found in the
    LTspice\lib\cmp\standard.dio file. You may need to remove the LTSpice
    specific parameters from the model if you use them in PSpice (you need
    the PSpice Reference Guide PDF which is found in the Orcad DOC
    directory). The N values are all over the map in these three models,
    so check these models against your actual LED.

    3. Do a google search with these parameters: led spice model
    Some results:

    4. Use the PSpice Model Editor which is a separate program in the
    PSpice install. You can make I-V measurements and create a simple
    Spice model. If you are only after a simple DC model, you can make a
    model quickly. It also has an IBIS translator, but I've never tried

    5. Post this question in the LTSpice Users group on Yahoo.
  9. Boki

    Boki Guest

    qrk 寫�:
    Great information, thanks!

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