Hot Topic:
High-power LEDs

EDN

• Visionaire Lighting’s Solar Vision Pole: shedding light on off-grid lampposts
  
  Author: By Margery Conner, Technical Editor | Date: Nov 26, 2009
  Certain applications justify paying a premium for high efficiency, long life, ruggedness, and light-color-temperature control, and these applications represent the sweet spot for HB LEDs (high-brightness light-emitting diodes).
• Discrete-component buck converter drives HB LEDs
  
  Author: Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India; Edited by Martin Rowe and Fran Granville | Date: Mar 5, 2009
  ...efficiencies were 60 to 95% for supply voltages of 6 to 10V. References Saab, Alfredo H, and Steve Logan, “ High- power LED drivers require no external switches,” EDN, July 19, 2007, pg 78. Gadre, Dhananjay V, “Buck regulator...
• High- power LED drivers require no external switches
  
  Author: Alfredo H Saab and Steve Logan, Maxim Integrated Products, Sunnyvale, CA; Edited by Charles H Small and Fran Granville | Date: Jul 19, 2007
  Design Idea High- power LED drivers require no external switches Suiting a variety of applications, these circuits transform a switching regulator into...
• Designing with high-power LEDs on epoxy-glass boards
  
  Author: By Carl Spearow, Zephyr Engineering | Date: Mar 31, 2008
  ...materials to produce acceptable high- power LED applications. By Carl Spearow...materials, to produce acceptable high- power LED applications, such as that in...package for that application. A high- power LED (loosely defined as an LED that...
• EDN 07/19/2007 Table of Contents
  
  ...digitizer offers low power consumption Design Ideas Analyzer tests reverse-recovery behavior of diodes High- power LED drivers require no external switches Perform PSRR testing with analyzers having no dc-bias ports Video Design...
• High-brightness LEDs usher in new applications and standards
  
  Author: By Margery Conner, Technical Editor | Date: Dec 14, 2007
  ...eight 700-mA, highly efficient, 3.75V LEDs connected in series (Figure A). The Intersil ISL97801 HPLED ( high- power- LED) driver powers this circuit. This driver has an integrated 3A switch, I/O short-circuit protection, and...
• Researchers estimate $1.83T savings, massive CO2 emissions reductions from use of LEDs, smart lighting
  
  Author: By Suzanne Deffree, Managing Editor, News | Date: Dec 22, 2008
  ...reduced by terawatt hours, and the financial savings would total $1.83 trillion. For more on LEDs, see EDN's high- power LED Hot Topic page. Further, the two professor estimate carbon dioxide emissions would be reduced by 10.68 gigatons...
• FROM EDN EUROPE: Linear regulators face extinction
  
  Author: By David Marsh, Contributing Technical Editor | Date: Oct 13, 2005
  ...the Supertex HV9910 and three inductors to double-downconvert ac line to derive a constant current for a single high- power LED costs about €4—of which inductors account for €1.77. This design—for which Supertex offers the HV9910DB5...
• Design Ideas test setups don't rely on data sheets
  
  Author: Charles H Small | Date: Jul 19, 2007
  ...that has no dc-bias port but that can characterize frequency response as low as 10 or even 1 Hz. Lastly, " High- power LED drivers require no external switches" presents an array of five high-current LED drivers that operate from a variety...
• Markus Unread on Real-world numbers on production HB LEDs: 32% efficiency at 9/2/2009 3:30:52 AM
  
  Author: Margery Conner | Date: Aug 31, 2009
  Technical Editor Margery Conner's PowerSource streams the latest developments in electronic power design and related technologies. Follow Margery on Twitter at: http://twitter.com/margeryc.
• Video Design Idea: Buck regulator controls white LED with optical feedback
  
  Author: Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India; Edited by Charles H Small and Fran Granville | Date: Oct 25, 2007
  ...output voltage, which stabilizes the white-LED light. References Saab, Alfredo H, and Steve Logan, “ High- power LED drivers require no external switches,” EDN, July 19, 2007, pg 78. “Specifications for Nichia Warm White LED...
• Do you know enough about LEDs?
  
  Author: Suzanne Deffree | Date: Sep 22, 2009
  What's happening in the electronics supply chain that will change the way business is done? News Editor Suzanne Deffree looks at environmental regulations, RFID, inventory levels, globalization, distribution, and a host of other issues that influence the electronics supply chain.
• Digi-Key inks LED, lighting distribution agreement
  
  Author: By Suzanne Deffree, News Editor | Date: Nov 9, 2007
  ...Quattro, come in a range of sizes from 18W to 400W, the companies said. “We are very pleased to add Enfis’ high power LED light engines to our product portfolio,” said Mark Larson, Digi-Key president, in a statement. “We are certain...
• Hot/Cold factor holds key to real-world efficacy for HB-LEDs
  
  Author: Margery Conner | Date: Aug 25, 2009
  Technical Editor Margery Conner's PowerSource streams the latest developments in electronic power design and related technologies. Follow Margery on Twitter at: http://twitter.com/margeryc.
• Demo: Soldering an HB LED to its aluminum substrate/heatsink with a heat gun
  
  Author: Margery Conner | Date: Aug 10, 2009
  Technical Editor Margery Conner's PowerSource streams the latest developments in electronic power design and related technologies. Follow Margery on Twitter at: http://twitter.com/margeryc.
• Dev-Monkey | EDN
  
  Developed for evaluating the MAX16822A/MAX16822B step-down constant-current high-brightness LED (HB LED) drivers, the MAX16822B evaluation kit (EV kit) is configured as a step-down topology for external, user-supplied HB LEDs.
• Dave on LED inefficiencies: 82% of lighting energy lost as heat at 7/8/2009 2:00:30 PM
  
  Author: Margery Conner | Date: Apr 13, 2009
  Technical Editor Margery Conner's PowerSource streams the latest developments in electronic power design and related technologies. Follow Margery on Twitter at: http://twitter.com/margeryc.
• shahnawaz on“Sixth sense”device relies on HB LED-based projection at 7/23/2009 10:54:12 PM
  
  Author: Margery Conner | Date: Mar 25, 2009
  Technical Editor Margery Conner's PowerSource streams the latest developments in electronic power design and related technologies. Follow Margery on Twitter at: http://twitter.com/margeryc.
• blogpostPrint on EDN: Electronics Design, Strategy, News
  
  ...that has no dc-bias port but that can characterize frequency response as low as 10 or even 1 Hz. Lastly, " High- power LED drivers require no external switches" presents an array of five high-current LED drivers that operate from a variety...
• EDS: Strategy for distributor success with HB LEDs
  
  Author: Suzanne Deffree | Date: May 7, 2008
  What's happening in the electronics supply chain that will change the way business is done? News Editor Suzanne Deffree looks at environmental regulations, RFID, inventory levels, globalization, distribution, and a host of other issues that influence the electronics supply chain.