Interesting newish zetex led driver

[tonycollinet]

Single chip constant current led drvier from zetex. Couldn't find anything on here about it so far, so this is a heads up.

5 pin tsot 23-5 package (small). Only 4 external components needed to make a 1amp constant current source for driving power leds. Buck topology (so voltage step down only). 7 to 30V input voltage, but there is also a version for up to 60V input.

http://www.zetex.com/3.0/product_portfolio.asp?pno=ZXLD1360&h=91

I think my next light will be based around this, once a lens is available for the 3xrebel stars.

 

[Gryloc]

Hmmm, thanks for sharing. I am continually looking for the ideal driver to power about three strings of 3 or 4 series connected Rebels or New K2s (depending on the forward voltage of each). Even if I have to have three separate drivers on one board (one for each string of LEDs), that is fine. Since this IC is small, requires a few components, and is dimmable, then this looks even more like a winner for me.

I am revising an older LED headlamp that I made by using a smaller cluster of the newer, high-efficiency LEDs, so this is very helpful. 1A is perfectly fine since I want to use 8 (4X2) or 9 (3X3) Rebel 0100s, and they are bright enough that I can reduce the current and still be within the required range of lumens. Being dimmable is nice since I can attach a small relay to each channel that will switch between two resistor values (for high and low beams) with one 12V input. I hope it is cheap and easy to purchase a minimum of 10 or so. Would you know where to find Zetex driver ICs? I skimmed through the datasheet, but is it hard to find the values of the other required components? Some datasheets have you use a slew of formulas to find inductor values and such. I understand how to wire one of these up, and I understand the basics of what is going on, but I am no electrical engineer. Thank you!

-Tony

 

[tonycollinet]

How desperate are you?

I'll be putting a design together but it may take me 2 or 3 weeks. From my point of view there is not to big a rush, cos I can't get the leds I need (and I haven't yet found a ready source of the IC's - I think they are still a little new)

There is a 350mA version which is more available I think.