Designing dimmers for multiple LEDs

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An LED related "How To" article has been posted on the site - How to design dimmers for multiple LEDs

Written by Michael Bairanzade, application engineer and Marie-Therese Capron, director, low voltage power management at ON Semiconductor.

They write about how an embedded gradual dimming function provides an easy way to generate the special illumination sequences being requested by portable goods manufacturers. This provides a way, they say, that they could differentiate themselves from their rivals.

It begins:
Not only will the LED peak current I tend to be fully programmable, but it will be expected that each LED can be dimmed to any value between zero and its maximum specified level.

Generally speaking, LED drivers provide a constant current to bias the LED in appropriate conditions. In a typical portable system, the power source is a battery with an output voltage ranging from 2.8 V to 4.2 V (assuming a standard Li-Ion battery is used).
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LED Lighting guides

See also Electronics Weekly's roundup of content related to LEDs, with a special focus on both white LEDs and coloured LEDs, and Lighting LEDs.

* White LEDs

* Coloured LEDs

* LED Lighting (1)

* LED Lighting (2)

* LEDs General

* LED optics

* OLEDs

* 50 year history of the LED








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Author Profiles

Paul Ward
As Opto Product Manager at Farnell, Paul is overseeing the company's involvement in the rapidly evolving and high profile LED lighting market sector.

As well as ensuring that Farnell offers the latest technologies and products related to solid state lighting, Paul is also responsible for ensuring that the resources are in place to make it easier for design engineers to specify and design-in LED solutions for their applications.

Educated in Production Engineering and Design at Sheffield Hallam University, Paul has worked in various engineering, training and marketing roles for companies including C&K switches, ITT Cannon, Cherry and LED specialist Chicago Miniature Lighting.

Away from the world of LEDs, Paul is a Founder of the charity RTTW, Photographer and Harley Davidson rider; he has ridden and snapped across Europe, New Zealand and the USA on his chrome hog!

Gordon Routledge
Gordon Routledge is one of the original pioneers in LED illumination having worked with LEDs in illumination applications since 1996. Currently VP of Illumination at Dialight, Gordon founded Lumidrives in 2001, having previously been managing director at ACDC Lighting Systems. Gordon has a degree in Electrical & Electronic Engineering from university of Manchester Institute of Science and Technology.

Ian Bryant
ian bryant.jpgIan Bryant is Business Development Manager LED Division at Carclo Technical Plastics. He has worked on and off at Carclo (Formerly Combined Optical Industrial) since leaving school. He has worked through the company from Toolmaking to starting the company on the road of LED optics business some 6-7 years ago, starting with a standard range and more in line with the business of custom optics. In between all this he has worked in engineering and as a works Director for a hydraulics company but kept getting pulled back to the optics industrial. We are able to offer the full solution from idea to parts so have a very good understanding on what is needed. You will see some posts from our design team also under my name.

About this Entry

This page contains a single entry by Alun Williams - Electronics Weekly.com published on February 8, 2010 4:14 PM.

SiL 2010 USA was the previous entry in this blog.

From lights to look at ... to lights to see with is the next entry in this blog.

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