Thank you Mr Eduardo for your reference link. Actually i had
attended to Lumileds - Luxeon seminars two weeks ago. For that reason i have
some theoretical information about power ICs for led applications. Also i
searched a bit for power supplies and i found some good links for these like
power integrations, on-semi and national. But i cant say that my practical
side is good. For now, i dont have the proper ic samples fro designing a psu
from scratch and it can take a few weeks to get the components. So i have to
complete my design with 24V meanwell smps.
         However i'm strictly on the smps subject because we will need to
design various led strips and mixed power-led products (including graphical
display boards, dmx512 controlled luminaires, high voltage led dimmers)
with different configurations of input-output voltage/current requirement.
On The onsemi.com i have found an offline smpss which can accelerate my
future design works. What's your comments for this kind of smps types?


2006/2/23, Eduardo Garcia <egnascimento@yahoo.com.br>:
>
> Maybe you can use CI drivers for high intensity leds.
>
> Look at http://www.national.com/appinfo/power/lighting.html and you can
> see
> in any application note the information what you need.
>
> Good Luck,
> Eduardo Garcia
>
> ----- Original Message -----
> From: "G=F6khan SEVER" <gstr2005@gmail.com>
> To: <piclist@mit.edu>
> Sent: Thursday, February 23, 2006 5:45 AM
> Subject: [OT] trouble while driving power leds
>
>
> > hi,
> >
> > i'm new to power-led design area. I have to design a led strip with 6
> > white
> > power led. I chose Luxeon
> > III Emitter White leds for my application. I have prepared the pcb and
> > proper heatsink for my design.
> > The strip will be sourced with 24V DC Meanwell smps. (this smps has max
> > 10A
> > drive capability) So i
> > calculated required resistor value for driving the strip at 1A which is
> > 24-6Vf =3D R (The datasheet of
> > Lux III Emtter notes that it has 3.90 forward voltage at 1A) So i have
> > chosen the Resistor value
> > 0,75R / 5W. But when i conntected the serie to the power supply i only
> get
> > 500mA and the value
> > increased slowly to the 650mA and after that no increasing in current.
> >
> > I looked the luxeon datasheets and application notes over and over but
> > still
> > i havent found where is
> > the problem? Do i need to design a specific smps with different
> topologies
> > or else?
> > (Datasheets and application notes can easily found on www.luxeon.com)
> > --
> > http://www.piclist.com PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
>
>
>
> _______________________________________________________
> Yahoo! Acesso Gr=E1tis - Internet r=E1pida e gr=E1tis. Instale o discador=
 agora!
> http://br.acesso.yahoo.com
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist