EDN Designing With LEDs

8/4/2019 EDN Designing With LEDs

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DESIGNING WITH LEDS EDN 1

Exclusive EDN e-Book

SAN JOSE, CA

from the

Technical Seminar

May, 2011


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Welcome to the e-book version of

EDNs 2011Designing with LEDsseminarManufacturers of high-brightness LEDs continue to push the boundaries

of LED efcacy and color quality. Residential and industrial customers

alike want the energy-efciency and enhanced performance levels

of solid-state lighting. The technology and market demand combine

to make LED-based lights, from the home to the factory oor to

the municipal parking lot, a vibrant and growing market. However,

constraints such as legacy lighting control and dimmers as well as

thermal limitations pose ongoing challenges for circuit and lighting

design engineers. New products from power and thermal management

component manufacturers introduce new products to meet these

challenges, but how to select which offerings match your design needs?

EDNs 2011 Designing with LEDs Workshop held in May in San Jose, CA

brought together industry experts from both the LED and IC control

industries for panel discussions, technical papers, and afternoon

workshops on LED selection and control. This ebook presents the

slides for the technical papers presented on topics ranging from power,

thermal, and color management. We hope you benet from these

presentations, and look forward to seeing you at the next LED workshop

held in Boston on September 27, 2011!

Best Regards,

Margery Conner

Technical Editor, Power and Components

EDN magazine

[email protected]

5Putting the light only where its needed:

A Primer on LED Optics

James oConner, Carclo Plastics

26Thermal Management Considerations for

High Power LED Lighting Applications

Steve Taylor, The Bergquist Company

36LEDs Dimming is Easy!...?

Ethan Biery, Graham Christensen, and Tom Shearer, Lutron Electronics

44Wireless Control Networks for Enhanced Lighting Installations

Niel Smith & Colin Faulkner, NXP

51Design Considerations for Efficient Luminaires Using Remote Phosphor

Chuck Edwards , Intematix

55Meeting ENERGY STAR Lifetime Requirements for LED Lamps

Andrew Smith, Power Integrations

60Understanding and Modeling Thermal, Optical, and Electrical Interactions

Ron Lenk, Reliabulb

66LEDS Beyond Light:

Solar-powered lighting

Dave Priscak, Texas Instruments

Table of Contents


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Allied Electronics is a small order, high service level distributor of electronic components and electromechanical products with over 50 sales ofcesacross the United States and Canada. With more than 2.2 million parts online and more than 120,000 products featured in the Allied catalog,engineers and purchasers often look to Allied for prototyping due to its broad range of product solutions from over 300 world-class suppliers.Allieds relationships with suppliers are a key strength in maintaining high standards of product availability. The breadth of product offeringmeans that Allied is able to provide product solutions to a wide range of customers from all areas of industry and commerce.

Avnet Electronics Marketing whether you are considering a new application or are interested in re-visiting an existing design, AvnetElectronics Marketing has the LED technology and product experts you need to get the job done. Our team of engineers can help with all areas

of LED technology, thermal management, power driver stage and secondary optics. From design to delivery Avnet Electronics Marketing bringstogether the worlds foremost LED, high-performance analog and optical/electromechanical manufacturers, along with best-in-class technicalexpertise and supply chain management services.

The Bergquist Company designs and manufactures high performance thermal management materials used to dissipate heat and keep electroniccomponents cool. Our Thermal Clad is a metal core printed circuit board (MCPCB) providing complete thermal management for surface mountcomponents and High Power LED applications. Available in standard and custom congurations, Bergquist Thermal Clad solutions providebetter thermal management resulting in lower die temperatures, extended LED lifetimes, and increased light output. With some of the best-known brands in the business including: Sil-Pad, Gap Pad, Gap Fillers, Bond-Ply, and Hi-Flow phase change grea se replacement materials;Bergquist is your total thermal management supplier.

Coilcraft is a worldwide manufacturer of high frequency power magnetic components. Use our web-based design tools specically for LED designersat www.coilcraft.com. Find the inductor you need based on a specic IC or driver topology. Compare the efciency of several inductors, and putthe coupled inductor nder for SEPIC applications to work for you. Use the handy web-based simulators from major IC manufacturers, too, anddont miss our generous, easy-to-order free sample program. Take advantage of our tools to help speed the design and optimize the performance ofyour LED driver circuit.

Cree is Lighting the LED Revolution by leading the industry in innovation, performance and application optimization. We understand therequirements and optimize our lighting-class LEDs for application needs. Cree XLamp LEDs can enable simplied design and lower system costs.Raising the bar for both LED performance and low-cost applications, Cree never stops innovating and pioneering. With our industry-leadingapplications support and design expertise, Cree helps customers to quickly develop, introduce and market new LED lighting products. Visit www.cree.com/xlamp to nd out how Cree is revolutionizing the industry.

CUI Inc is a technology company dedicated to the development, commercialization, and distribution of new, innovative electro-mechanicalproducts. CUIs Power line recently introduced the VLED15 series ac-dc LED drivers designed for driving high powered LEDs. These constantcurrent vdrivers offer icker free operation when used with standard triac based incandescent dimmers. This makes them perfect for retrottingexisting applications or for integration into new systems that will use standard triac or electronic low voltage dimming devices.

As one of the worlds leading, totally integrated distributors of electronic components, Digi-Key Corporation has earned its reputation as anindustry leader through its total commitment to service and performance. Digi-Key is a full-service provider of both prototype/design andproduction quantities of electronic components, offering more than two million products from over 470 quality name-brand manufacturersat www.digikey.com. North American design engineers have ranked Digi-Key #1 for Overall Performance for 19 consecutive years (EE|TimesDistribution Study/October 2010). With global sales for 2010 surpassing $1.5 billion, Digi-Keys single location in North America is one of itsgreatest assets.


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International Rectifier is a world leader in power management technology. IRs analog and mixed-signal ICs, advanced circuit devices, integratedpower systems and components enable high performance computing and reduce energy waste from motors, the worlds single largest consumer ofelectricity. Leading manufacturers of computers, energy efcient appliances, lighting, automobiles, satellites, aircraft and defense systems rely onIRs power management benchmarks to power their next generation products.

Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performanceanalog integrated circuits for major companies worldwide for three decades. The Companys products provide an essential bridge between our

analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer,and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs,and Module? subsystems. For more information, visit www.linear.com.

Maxim makes LED lighting smarter. Our driver ICs ensure full compatibility with existing infrastructure to speed the transition to LED lighting.Our powerline communication (PLC) technology enables affordable control across long distances and transformers. And our energy-measurementSoCs allow users to quantify these savings. Click here to learn more.

National Semiconductors energy-efcient LED drivers provide constant current to arrays of LEDs, enabling color and brightness matching overa wide temperature range. Through dimming, thermal management, and fault protection, Nationals drivers improve performance in a variety ofapplications. Use the new WEBENCH LED Architect design tool to build the optimal LED driver system to meet your requirements. Check out

Nationals LED drivers and design tools today.

OSRAM Opto Semiconductors, a wholly owned subsidiary of OSRAM GmbH, develops intelligent lighting solutions and is one of the worlds leadingmanufacturers of optoelectronic semiconductors. For more than 30 years the company has stood for innovative technology, setting standards in a widerange of applications. Its product portfolio includes components for illumination, visualization and sensing. High-power light emitting diodes (LEDs),semiconductor lasers and infrared diodes (IREDs), detectors are among the most well-known products. The range of LED light sources covers everythingfrom LEDs for backlighting cell phone displays to extra bright LEDs for street lighting, TV screens and automobile headlights.

Philips Lumileds is a leading provider of LUXEON power LEDs for everyday lighting applications. The companys records for light output, efcacyand thermal management are direct results of the ongoing commitment to advancing LED lighting technology and enabling lighting solutionsthat are more environmentally friendly, help reduce CO emissions and reduce the need for power plant expansion. LUXEON LEDs are usedwidely in outdoor, shop and home lighting, digital imaging, display and automotive lighting. Philips Lumileds is a fully integrated supplier,producing core LED material in white and all three base colors: red, green and blue. For more information visit www.philipslumileds.com.

Renco Electronics is a world class, Engineering driven manufacturer of transformers, inductors, & subassemblies that utilize magneticcomponents. Rencos components are designed into thousands of products including: Led bulbs, Cappuccino and coffee makers, parts for backupgenerators in the space station, mass ow meters for food and beverage makers, electric smart meters, and everywhere else you can imagine. AtRenco, we can build to print, work in conjunction with your engineering team, or completely custom design inductors or transformers to yourspecications. We will build from 10 pieces to 10 million pieces in our manufacturing facilities in N.A. & China.


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EDN Designing With LEDs