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CXA2520-0000-000N00P227F Datasheet(PDF) 9 Page - Cree, Inc |
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CXA2520-0000-000N00P227F Datasheet(HTML) 9 Page - Cree, Inc |
9 / 12 page 9 XLamp CXa2520 LED 6-inCh DownLight REfEREnCE DEsign Copyright © 2013 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. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com. 5. ConsIDER ALL DEsIgn possIbILItIEs There is a multiplicity of ways to design an leD-based downlight. This reference design aims to show that a single easy- to-use cXa2520 leD enables a downlight offering superior performance. This design presents a number of desirable performance‑related benefits that are results of the XLamp CXA2520 LED package. Because the cXa2520 leD uses easywhite™ technology, leD-to-leD color consistency can be held to within two or four McAdam ellipses for any given CCT, depending on the order code. The CXA2520 LED is binned at 85 °C, so the ccT will be as faithful as possible to the system operating environment. These component features allow for new levels of specification accuracy. However, the primary purpose of this reference design is to show how simple and straightforward it is to design with cree’s Xlamp cXa2520 leD. This application note is not intended to show the only way to do this, but instead demonstrate the ease of implementation with this set of engineering constraints. certainly numerous other successful solutions are possible. The performance range of the Xlamp cXa2520 leD enables a wide variety of luminaires that all use a single cXa2520 leD. ccTs from 2700 K to 5000 K and lumen output up to 4500 lm9 is available, providing the flexibility to offer a variety of luminaires that use a single LED light source and reflector. This flexibility is enhanced by the XLamp CXA2530 LED, which has the same physical dimensions and optical source size as the CXA2520 and offers even more design possibilities. 6. CompLEtE thE fInAL stEps: ImpLEmEntAtIon AnD AnALysIs Using the methodology described above, we determined a suitable combination of an leD, components and drive conditions. This section describes how cree assembled the downlight and shows the results of the design. prototyping Details 1. We verified the component dimensions to ensure a correct fit. 2. we attached the cXa2520 leD to the heat sink with a small amount of thermally conductive epoxy.10 Thermally conductive compound can also be used.11 3. after the thermal epoxy cured, we fed the driver output wires through the heat sink and soldered them to the leD, following the recommendations in cree’s Soldering and Handling application Note for the cXa2520 leD.12 4. We tested the connection by applying power and verified the LED lit up. 5. We positioned the reflector on the LED, added the cover glass and secured both parts to the heat sink with the screw-on front trim ring. 6. We performed final testing. 9 At 61 W, 85 °C 10 we used Silanex Technology ST0903. www.silanex.com/product03.htm 11 refer to cree’s chemical compatibility application note for compounds that are safe to use with cree leDs. cree Xlamp leD chemical compatibility application Note, ap63, www.cree.com/products/pdf/Xlamp_chemical_comp.pdf 12 cree Xlamp cXa Family leDs Soldering and Handling, application Note ap74, www.cree.com/xlamp_app_notes/cXa_SH |
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