Any help would be appreciated as I am new to LED drivers. I have a very basic understanding of electronics and I'm not up to designing my own driver yet.
I have tried to power this LED with a Meanwell LDD-1200 from 5 or 6 lithium batteries but the voltage varies as the batteries discharge and the LDD uses 3V dropping the output voltage.
If someone doesn't mind sould you please design a circuit for me?
If a driver already exists that isn't too expensive or too large (i intend to use this LED for mounting biking, i have only one functioning cochlear and i rely on vision for balance at night)
The short of it:
I am wanting to drive a Cree CXA1512 LED @ 1200ma with a dimming control.
The Long of it:
I would like a Switch Mode (I hear that switch mode produces the least heat) Constant Current (1200ma) driver with dimming if possible (not necessary but preferable).
The CXA1512 runs at 18V and max current is 1200ma.
Intended battery pack would either be 5 or 6 lithium cells (3.7V 3200ma) in series OR parallel depending on whether a buck or a boost system would be best/easiest.
For dimming I'd like a potentiometer. I'd like to stay away from micro controllers.
Would it also be possible for the design to be scalable? I.E. change a few component values to run a string of 4 cree XML leds, which differ in current and voltage.
Or make the circuit adjustable so one could adjust the CC value and then the voltage to suit.
I was originally trying to fit the circuit into an existing bike LED light shell but I realise that the circuit may need to fit on the battery pack instead, however the smaller the form factor the better.
Thankyou for you time in advance.
Roy
Best Answer
First impression:
The below figure from datasheet says that, it has a forward voltage drop of about 20 V at room temperature, and will be more at lesser temperature.
LM43602 or TPS54231 can switch the output to about 21 V from a input of 23 to 25 V. I would use 8 battery cells (total voltage of ~29 V to ~23 V)
STCS1 or similar rated constant current LED driver (1.5 A max) if the power section is only for driving LED section.