Urgent : LED driver design

[kawaiicat]

led driver design

i need to finish the white led driver design in 2 weeks, i got some question see anyone can help me.

here i want to model the white led diode, so i can do the simulation for them, here i can obtain those diode model, any manufacturer recommend? i search for long but i cna't find any. also inductor and diode, for diode i did find one, but inductor, i have no idea. anyone can help?

also i have compete the feedback loop, but i donno what i shoudl vary to see my system work or not, any help?

 

[nicleo]

wled spice model

Do you mind to share which simulation software that you're going to use to model your problem?

 

[kawaiicat]

nichia white led spice model

spice and hspice

 

[sunking]

rgb led hspice model

use the ideal inductor LXXX

 

[Btrend]

in my opinion, inductor should include ESR. but if ur application is low current , the ESR is too small to notice.
btw, what company will do such thing ? design an IC just in 2 weeks ?

 

[kawaiicat]

well, coz i dont' have inductor model, so i need to seek one in order to simulate

not company, it's my graduate project actually, now i need to see the close loop, the feedback path i have done. i use the ideal model to see if my boost convert can up to around 20V

 

[qutang]

led is difficult to design.

 

[electronrancher]

ideal inductor is already included in hspice. it's call looks like
L1 Node1 Node2 L 22uH

Here is a cheap model I used for nichia WLED. Gives about 3.4v at 20mA. I made it myself based on some lab measurements.

.MODEL WLED D
+ IS=1.5e-15
+ N=4
+ RS=15

PS - I did some magnetic boosts for WLED. Maybe I can help..

 

[marshel]

The LED model I have used is:
.model WLED D(Is=1e-30 N=1.923 Rs=32.09 Eg=3.6 Cjo=63.87p M=0.1513 Vj=2.02 Fc=0.5 Isr=1.304m Nr=1.4Meg Bv=12 Ivb=369.5u Tt=432.8n Xti=5)

Hope it is useful for u.

 

[jiangfuchun]

who have designed RGB LED driver?
and who have RGB LED model?

 

[allennlowaton]

The LED model I have used is:
.model WLED D(Is=1e-30 N=1.923 Rs=32.09 Eg=3.6 Cjo=63.87p M=0.1513 Vj=2.02 Fc=0.5 Isr=1.304m Nr=1.4Meg Bv=12 Ivb=369.5u Tt=432.8n Xti=5)

Hope it is useful for u.

hello Marshel..I would just like to ask, what is the name of the product that this model is being patterned for?
Sorry, I can't see the forward voltage and forward current from this model..blame it to my ignorance..
Thank you...