red LED model

Â© · Post by Â© » Fri Oct 12, 2012 11:45 am

i want to simulate bias with HLMP-6000 (aka standard red LED; used to be HP, then Agilent, now Avago, data sheet here: http://www.avagotech.com/docs/AV02-3609EN). perusing the web i found the following model on http://www.groupdiy.com/index.php?topic=9121.0:

*Typ RED GaAs LED: Vf=1.7V Vr=4V If=40mA trr=3uS
.MODEL LED1 D (IS=93.2P RS=42M N=3.73 BV=4 IBV=10U
+ CJO=2.97P VJ=.75 M=.333 TT=4.32U)

i inserted the model into "standard.dio" as follows:

.model HLMP-6000 (IS=93.2P RS=42M N=3.73 BV=4 IBV=10U CJO=2.97P VJ=.75 M=.333 Iave=0.04 mfg=Avago type=LED)

the HLMP-6000 shows up in the pull-down menu. however when trying to sim, i get a warning Can't find definition of model "HLMP-6000".

where's my mistake?

thanks for help! Â©

sbench · Post by **sbench** » Fri Oct 12, 2012 4:54 pm

Hi C,
You typed in
model HLMP-6000 (IS=93.2P RS=42M N=3.73 BV=4 IBV=10U CJO=2.97P VJ=.75 M=.333 Iave=0.04 mfg=Avago type=LED)

What is missing is the "D" before the parenthesized data. I was able to reproduce your results, and when I added the D to make your model

model HLMP-6000 D(IS=93.2P RS=42M N=3.73 BV=4 IBV=10U CJO=2.97P VJ=.75 M=.333 Iave=0.04 mfg=Avago type=LED)
everything started to work.

Have fun!
Stephie <3

Â© · Post by Â© » Fri Oct 12, 2012 5:19 pm

if only everything in life was as simple

THANKS!

however, i question the accuracy of that model. i added two HLMP-6000 to bias my 6S45Ï€-spud today. with 188 Vdc B+ the bias with the two HLMP-6000 is 1.6xx volts. simming the same circuit with LT spice, i get a bias of 1.84 Vdc.

(actually i wanted to sim if one HLMP-6000 is enough for the current or if i need to run two in parallel.)

thanks anyway!

Â©

ps. whyn't you come to berlin? the ETF folks all miss you! (and some want to dance with you hehehe...)

sbench · Post by **sbench** » Fri Oct 12, 2012 6:51 pm

I will get to ETF again, as I want to dance with some of you handsome guys too.

I'm preparing for my sister's upcoming surgical visit, so saving days off and conserving $$$. We'll both probably come next year. The attached picture is both of us with a friend of ours in Houston TX. (We were visiting our other sister Joan, and stopped by at a friends house.)

The difference between 1.6 and 1.8 volts isn't too surprising a difference considering variation from device to device- a little over 10%.