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PSPICE LED simulation

B

Boki

Jan 1, 1970
0
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.
 
J

Jonathan Kirwan

Jan 1, 1970
0
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!

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
 
P

Pooh Bear

Jan 1, 1970
0
Boki said:
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!

Stick 2 x 1N4148 in series.

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

Graham
 
M

me

Jan 1, 1970
0
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.

So what's to simulate?
 
P

Pooh Bear

Jan 1, 1970
0
me said:
So what's to simulate?

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
 
B

Boki

Jan 1, 1970
0
Jonathan Kirwan 寫�:
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

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.
 
Q

qrk

Jan 1, 1970
0
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.

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:
http://www.orcad.com/documents/community.an/pspice/tn27.aspx
http://www.edn.com/index.asp?layout...61&pubdate=1/18/2001&spacedesc=bestofdi_softw
http://www.hhydr.com/How-to-simulate-LED-using-Micro-Cap-1312805.html

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
it.

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

Boki

Jan 1, 1970
0
qrk 寫�:
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:
http://www.orcad.com/documents/community.an/pspice/tn27.aspx
http://www.edn.com/index.asp?layout...61&pubdate=1/18/2001&spacedesc=bestofdi_softw
http://www.hhydr.com/How-to-simulate-LED-using-Micro-Cap-1312805.html

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
it.

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

Great information, thanks!

Boki.
 
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