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NXP CREE TASK LIGHT REFERENCE DESIGN

Copyright © 2011 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. 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.

Thermal Management

Thermal management is critical in SSL luminaires. Ensuring the recommended maximum LED junction temperature is

not exceeded is critical to long life and color point stability of the LEDs. We designed an aluminum housing, increasing

the housing cost by 30% over a sheet metal version. This increased cost was offset by improved thermal performance

without the necessity of an additional heat sink. An aluminum housing allows the LED assembly to be produced with

standard FR-4 PCB material.

Thermal images of the LED board show that the system is well below the recommended maximum operating tempera-

tures of the components in the design.

Figure 11 shows a thermal view of the LED area of the LED task light. The temperature/time chart plots the maximum

temperature in the LED area versus time

Figure 11: Thermal view of LED task light

Figure 11 – part 1

Figure 11 – part 2