hello guys..
I am currently simulating a white LED model that I found on the internet.
Can somebody explain here each of the variables in the model? I want to find the forward voltage as well as the forward current for this model.
You need to study the diode model, this page could help you: SPICE models : DIODES AND RECTIFIERS
Plotting the curve If vs Vf you can understand the behavior of the component.
"Recombination current parameter" according to my Spice documentation (SIMetrix). It doesn't seem to be in the Hspice documentation so I guess it is a Pspice parameter (SIMetrix accepts Pspice & Hspice models).
It appears in equations with temperature effects as well.
Yes, they are Pspice parameters. Just remove them. I have run a simulation of V/I for the diode and cannot see any difference in the results. It may have an effect with modulation or recovery from reverse breakdown - I don't know because I don't know what they are really for. erikl may be able to help.
Thank you keith.
The I/V for this model shows that after Vin =3v, the current behaviour is linear.
But, as I tried to look at some white LED specs, the current behaviour is exponential.
Can you suggest some variables to be varied so that I can obtain an IV graph closely related with the existing products.
thank you erikl.
do you have an information on what actual product does the OSRAM model represented?
I have found out that this model has 1.9volts when there's 20mA on it.
yeah. the model by electrorancher has 3.4-3.5 volts when there's 20mA.
thank you erikl.
do you have an information on what actual product does the OSRAM model represented?
I have found out that this model has 1.9volts when there's 20mA on it.
OSRAM's Golden Dragon are high-power LEDs thought for 300..400mA operation. See **broken link removed** Even at these currents they own much smaller forward voltage (only 2.0..2.2V).