High-power LED driver

For the airsoft flag device project I have been working with normal or semi-high-powered LEDs. And they just weren't bright enough so I had to step it up to proper 1W or 3W LEDs.

However, that required me to change the circuits since it's not a good idea to drive a 1W LED with a series resistor since way too much power will get wasted in the resistor. The correct way of driving high-power LEDs is with a dedicated constant current circuit.

So I decided to make a small board with just the driver circuit and external leads for power, GND and LED control as well as leads for the LED itself.

Of all the many ways of making a constant current regulator, I decided to go with the ZXLD1350 IC for reasons I can't remember.

Here are links to the datasheets:
ELL5PS SMD inductor
ZLLS1000 SMD Schottky diode

EAGLE files: Eagle files

Terms of use: Yeah sure, go ahead. No guarantees, obviously.

3 comments on "High-power LED driver"
Bjørn says:


Nice thing I found here, and from another dane.. :)
I was wondering, could this be modified to use with commend anode/cathode RGB LEDs?

// Bjørn fra det fynske.

Jens Willy Johannsen says:

Hej Bjørn

it sure could, but I think for a RGB LED we'll need a bit more control so we can control the individual colors and so on.
In other words, it would probably be a better idea to start over if you need a circuit for a RGB LED driver.

[…] will be supplied from the flight battery through a ZXLD1350 switching regulator-based circuit I designed a while back for another […]

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