350mA LED driver with internal switch

[kara]

Very simple and useful.....

www.zetex.com/3.0/pdf/ZXLD1350.pdf

[nikhilele]

same thing can drive solid state lasers

[DTiziano]

I needed a switching current regulator for a power LED to be used for automotive application.
Last summer I found the Zetex chip and tried to bult a prototype.
The chip is wonderfull (there is also a 1 A version), the only problem I had was the size (very small).

[zeus]

See Monolithic Power

http://www.monolithicpower.com/dspg/MP2467.htm

[pl4tonas]

You may also consider the National Semiconductors, they have some nice ICs
One of them is the LM3404 and another one is the LM2734.

More information is on the following pdf file I Uploaded. The file is also available from The web of National but in case you don't want to search for it, it is here:

Code:

http://rapidshare.com/files/88632588/lighting_solutions_NSC.pdf

LM2734 is very small in size but LM3404 can supply constant current rather than constant voltage which is better in LED applications of this kind.

I have tryied the LM2734 and works fine.  I tryied it with various coils self made and it performed fine.