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Technical article Copyright © 2010 Cree, Inc. All rights reserved. The informat

Technical article Copyright © 2010 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree, the Cree logo and XLamp are registered trademarks of Cree, Inc. CLD-DG02 rev 2D Cree ® XLamp ® CXA LED Design Guide www.cree.com/XLamp Cree, Inc. 4600 Silicon Drive Durham, NC 27703 USA Tel: +1.919.407.5300 Product Design Guide Copyright © 2013-2014 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks of Cree, Inc. All other trademarks, products, and company names mentioned in this document are the property of their respective owners. This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com. ii CXA Design Guide Copyright © 2013-2014 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks of Cree, Inc. All other trademarks, products, and company names mentioned in this document are the property of their respective owners. This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com. CXA LED How‑To..........................................26 How To Select a Specific CXA LED - the Product Characterization Tool. ......................................... 26 How to Select a Driver. ....................................... 27 How to Assemble a CXA LED into a Lighting System............................................................ 27 Safety & Compliance. .....................................29 Summary..................................................29 Design Examples. .........................................30 Decorative. ....................................................... 30 Downlight. ........................................................ 31 Pendant. ........................................................... 31 Track Light. ....................................................... 32 Table of Contents Introduction................................................ 1 About This Design Guide.................................. 1 Thank You. .................................................. 1 CXA Family Product Cautions............................. 2 Storage & Handling........................................ 2 Mechanical Design......................................... 3 Typical Assembly.................................................3 Connectors.........................................................3 Connector Resources. ...........................................3 Mechanical Damage to Light Emitting Surface. .........6 Preventing Damage to CXA LEDs...........................6 Handling/Assembly..............................................6 Thermal Design............................................ 9 Heat & Lifetime...................................................9 Heat & Light Output........................................... 10 Ambient Temperature Measurement..................... 10 Thermocouple Attachment.................................. 11 Luminaire Case Temperature Measurement........... 11 Operating Limits. ............................................... 12 Low Temperature Operation................................ 12 Heat Sink Flatness and Cleanliness. ...................... 12 Thermal Interface Materials. ................................ 13 Thermal Design Resources.................................. 19 Electrical Considerations. .................................19 Multiple CXA LEDs. ............................................. 19 Electrical Overstress/Hot-Plugging. ....................... 19 Dielectric Voltage Withstand Testing..................... 20 Reverse Voltage. ................................................ 21 Chemical Compatibility...................................21 Chemical Resources........................................... 21 Hermetically Sealing Luminaires.......................... 22 Optical Considerations. ...................................22 Optical Design. .................................................. 22 CXA Lens Material Considerations........................ 23 CXA LEDs and Silicone. ....................................... 24 CXA Light Emitting Surface Comparison. ............... 24 Optical Design Resources. ................................... 24 1 CXA Design Guide Copyright © 2013-2014 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks of Cree, Inc. All other trademarks, products, and company names mentioned in this document are the property of their respective owners. This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com. Introduction This guide simplifies the CXA luminaire design effort by providing basic information on the requirements to use Cree XLamp® CXA LEDs successfully in luminaire designs, with appropriate consideration for mechanical, electrical, thermal and optical design and chemical compatibility. In addition, the Cree Solution Provider (CSP) program assists lighting manufacturers in identifying components and materials that work with Cree LEDs. In this document, the term CXA LEDs refers to Cree’s ceramic substrate CXA LEDs, i.e., all the CXA LEDs except the CXA2011. Cree’s CXA LEDs deliver high lumen output and efficacy in a family of single, easy‑to‑use components. CXA LEDs enable lighting manufacturers to quickly add LED products to their product portfolio. With Cree’s CXA LEDs, lighting manufacturers can have performance, reliability and ease-of-use in a single LED. This design guide explains how CXA LEDs and assemblies containing these LEDs should be handled during manufacturing. Please read this entire document to understand how to properly design with and handle CXA LEDs. About This Design Guide This design guide provides critical design guidelines, principles and best practices for successfully integrating the XLamp CXA LED into new and existing luminaire designs. • For additional product information or samples, please contact your Cree sales representative. • For technical information and support, please e-mail us at productsupport@cree.com. Consult the CXA family soldering and handling document for additional information on the proper procedures to solder and handle CXA LEDs. Thank You Thank you for choosing to incorporate the XLamp CXA LED into your luminaire designs. If you need assistance, Cree Services will support you with thermal testing assistance for lifetime analysis, available from Cree’s Thermal, Electrical, Mechanical, Photometric and Optical tests (TEMPO) for LED luminaires. 2 CXA Design Guide Copyright © 2013-2014 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks of Cree, Inc. All other trademarks, products, and company names mentioned in this document are the property of their respective owners. This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com. CXA Family Product Cautions • XLamp CXA LEDs must be electrically connected to an unenergized driver before applying power. “Hot plugging,” i.e., making a connection from a CXA LED to an energized driver, may cause irreparable damage and will void the product warranty. • All installations and applications of CXA-based luminaires are subject to the electrical, construction and building codes in effect in the final installation location. Installation by professionals having experience in the area of electrical lighting and formal inspection by the Authorities Having Jurisdiction (AHJ) is strongly recommended. • Thermal characteristics of CXA LEDs are affected by the luminaire and by the conditions in which the luminaire is installed. All final luminaire products should be evaluated in actual worst case installation conditions. Thermal limits of the CXA LED must be maintained for warranty consideration. CXA LED surfaces may be hot during operation. Take care during handling to avoid burns. Do not look directly at an energized CXA LED without proper eye safety precautions or diffusive shielding. Failure to follow the design guidelines in this document may void the product warranty and may present a hazard to property or personnel. Storage & Handling Store XLamp CXA LEDs in their original packaging to minimize potential for unintended contact and contamination. CXA LEDs must be handled with proper electrostatic discharge (ESD) handling protocols. Remove CXA LEDs from their package at an ESD‑safe workstation and use appropriate handling protocols and precautions when handling and soldering connections to the CXA LED. • Handle CXA LEDs in a clean environment, i.e., free from particulates, oil residues, etc. • Do not touch the light emitting surface (LES) of a CXA LED with tools or fingers. The LES is the part of the LED from which light is emitted. In the pictures on the cover page of this guide, the yellow or orange circle on each CXA LED is the LES. • Do not allow foreign material to touch the LES of a CXA LED. • Do not assemble CXA LED‑based luminaires in an environment in which foreign material can come in contact with the LED. • Material should be cleaned from a CXA LED by gently blowing the material off the LED with clean dry air (CDA) or by wiping the LED with a lint‑free swab dipped in isopropyl alcohol (IPA). 3 CXA Design Guide Copyright © 2013-2014 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo and XLamp® are registered trademarks of Cree, Inc. All other trademarks, products, and company names mentioned in this document are the property of their respective owners. This document is provided for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com. Mechanical Design Typical Assembly CXA LEDs are generally attached directly to a heat sink and discrete wires are used to deliver power to the LED, as illustrated in Figure 1. A thermal interface material (TIM) must be applied between the CXA LED and the heat sink to properly maintain thermal performance. Without the use of a connector to attach a CXA LED to a heat sink, apply thermal adhesive or thermal tape between the CXA LED and the heat sink. With a connector, apply thermal adhesive, thermal tape, a thermal pad, thermal grease, gel, gap filler or heat spreader between the CXA LED and the heat sink. Figure 1: CXA LED connected to heat sink, left: without a connector, right: with a connector Connectors The use uploads/s1/ cxa-design-guidecree.pdf