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Home › Magazines › 2006 › July › Driver for 20 LEDs

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Driver for 20 LEDs

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Published in issue 356, July 2006

If we wish to use a step-up switching regulator to run several LEDs from, for example, a 3 V battery, we find that the maximum usable mark-space ratio limits us to driving just a few LEDs in series. If we have seven white LEDs in series the total forward voltage will be about 7 times 3.4 V, or 23.8 V, requiring a mark-space ratio of around 90 %. This is the upper limit for many switching regulators.

Relevant websites

www.micrel.com/_PDF/mic2291.pdf
www.micrel.com/_PDF/App-Hints/ah-59.pdf
www.thatcorp.com/300desc.html

Click below to download a PDF copy of this article from Elektor magazine.

 

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PDF Article (060156-UK.pdf)
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Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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