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)
> -- =

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