Driver for LED CREE , max 3000mA ! Simple schematic !

[Cree Led]

I need a schmatic driver for led cree xm-l t6 , with discret components(resistor,transistor,etc) .
3.2-3.7 V , 3000mA (max) .
Thx!

 

[betwixt]

You need to give more information than that. What supply are you starting from?

Brian.

 

[Cree Led]

Informarion : led cree -> 3.2-3.7 V , 3000mA (max)
Starting from 0 (zerro) .

 

[betwixt]

Are you saying you want to drive it from a zero volt supply? Keep dreaming.

Brian.

 

[Cree Led]

No,i want to use my reglable power supply (max 18.5V ) .
The output of driver led cree i want to be constantly , 3V-3A .

 

[mtwieg]

Why discrete components? That just makes things more complicated...

Do you need isolation? Dimming?

 

[schmitt trigger]

Power dissipated in a discrete component linear regulator:
(18.5- 3.5)*3= 45 watt

Power actually employed by the LED:
3.5 * 3 = 10.5 watt

Total power:
45 + 10.5 = 55.5 watt

Efficiency:
10.5/55.5 = 18.9%