# PSPICE LED simulation

• posted

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, Boki.

• posted

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.

Jon

• posted

Stick 2 x 1N4148 in series.

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

Graham

• posted

So what's to simulate?

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• posted

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.

Graham

• posted

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• posted

Jonathan Kirwan =E5=AF=AB=E9=81=93=EF=BC=9A

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, Boki.

• posted

Number of options here:

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

1. 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.

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

1. 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 it.

2. Post this question in the LTSpice Users group on Yahoo.
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• posted

qrk =E5=AF=AB=E9=81=93=EF=BC=9A

Great information, thanks!

Boki.

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