Efficient LED Circuit

Thread Starter

rappa

Joined Nov 17, 2008
11
I have been using the LM317T to drive a 1W LED but I'm not really happy with the amount heat it generates.

Has anyone worked with the an LED driver, such as the STCS1 http://www.st.com/stonline/products/literature/ds/13415/stcs1.pdf ?
They provide an application circuit on page three. The feedback resistor is determined by Rfb = .100V/I So .286 Ohms for .350A.

The two challenges I see with the STCS1 are:

1. It's SOIC-8, so not breadboard friendly. Are there any tricks to getting it on a protoboard/breadboard?

2. The resistor values to output the necessary currents (.35A, .7A etc) are hard to find. In this case I need a .286 Ohm which I could not find anything close enough in a through-hole package. Is there a calculator of sorts that could determine the arrangement of standard resistors values to achieve this resistance?
 
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