quick and dirty current controlled led dimmer

[William Gaatjes]

I made this a while ago from components i had laying around.
It is not highly technical. But can be handy and upscaled in power easily.

If anybody is interested, here it is.

http://sourceforge.net/projects/ledlamps/files/

 

[PottedMeat]

Heh nice, very similar to mine. I've got 3 of those connected to 1W lensed luxeons in kind of a hydra looking lamp. Mine has the sense resistance cut down to ~1/3 ohm I think and higher gain on the amp. You may not need that MOSFET driver or the 5V regulator though.

That MCP34063 is a handy chip. Buck, Boost, Inverting, all in one.

 

[William Gaatjes]

Heh nice, very similar to mine. I've got 3 of those connected to 1W lensed luxeons in kind of a hydra looking lamp. Mine has the sense resistance cut down to ~1/3 ohm I think and higher gain on the amp. You may not need that MOSFET driver or the 5V regulator though.

That MCP34063 is a handy chip. Buck, Boost, Inverting, all in one.

You are right, i AHHRUMM (whispering) : "overdimensioned" it a bit. I had the parts laying around and was thinking of some feature use when upgrading the coil and other components.

But in all honesty : When it needs to be small, integrated solutions are avaliable :

For example the CAT4xxx series from ON semi.
ZXLD1362. from diodes inc.

http://www.diodes.com/datasheets/ZXLD1362.pdf

http://www.onsemi.com/PowerSolutions/parametrics.do?id=197

 

[William Gaatjes]

Forgot to mention that the ncp3063 is an updated and enhanced version.

When not using the output switch but an external swithc with driver, it runs easily at +300kHz.

http://www.onsemi.com/PowerSolutions/product.do?id=NCP3063BDR2G

datasheet.

http://www.onsemi.com/pub/Collateral/NCP3063-D.PDF