Datasheet

Copyright © 2008-2010 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree, the Cree logo and XLamp are registered trade-
marks of Cree, Inc.
9
XLAMP XP-E LEDS
THERMAL DESIGN
The maximum forward current is determined by the thermal resistance between the LED junction and ambient. It is
crucial for the end product to be designed in a manner that minimizes the thermal resistance from the solder point to
ambient in order to optimize lamp life and optical characteristics.
Graph 8
Blue
Graph 9
Green
0
100
200
300
400
500
600
700
800
900
1000
1100
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (°C)
Rj-a = 20°C/W
Rj-a = 25°C/W
Rj-a = 30°C/W
0
100
200
300
400
500
600
700
800
900
1000
1100
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (°C)
Rj-a = 10°C/W
Rj-a = 15°C/W
Rj-a = 20°C/W
Graph 8
Blue
Graph 9
Green
0
100
200
300
400
500
600
700
800
900
1000
1100
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (°C)
Rj-a = 20°C/W
Rj-a = 25°C/W
Rj-a = 30°C/W
0
100
200
300
400
500
600
700
800
900
1000
1100
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (°C)
Rj-a = 10°C/W
Rj-a = 15°C/W
Rj-a = 20°C/W
White, Blue and Royal Blue
Green
Rj-a = 10°C/W
Rj-a = 15°C/W
Rj-a = 20°C/W
Rj-a = 20°C/W
Rj-a = 25°C/W
Rj-a = 30°C/W
Graph 10
Red, Red-Orange
Typical Spatial Distribution
Graph 11
Amber
0
100
200
300
400
500
600
700
800
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (°C)
Rj-a = 20°C/W
Rj-a = 30°C/W
Rj-a = 40°C/W
0
100
200
300
400
500
600
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (°C)
Rj-a = 20°C/W
Rj-a = 30°C/W
Rj-a = 40°C/W
Red, Red-Orange
Graph 10
Red, Red-Orange
Typical Spatial Distribution
Graph 11
Amber
0
100
200
300
400
500
600
700
800
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (°C)
Rj-a = 20°C/W
Rj-a = 30°C/W
Rj-a = 40°C/W
0
100
200
300
400
500
600
0 25 50 75 100 125 150
Maximum Current (mA)
Ambient Temperature (°C)
Rj-a = 20°C/W
Rj-a = 30°C/W
Rj-a = 40°C/W
Amber
Rj-a = 20°C/W
Rj-a = 30°C/W
Rj-a = 40°C/W
Rj-a = 20°C/W
Rj-a = 30°C/W
Rj-a = 40°C/W