trademarks of Cree, Inc.

5

XLamp mL-B 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.

tyPical sPatial distriBution

0

20

40

60

80

100

120

140

160

180

200

0

25

50

75

100

125

150

Ambient Temperature (ºC)

Rj-a = 30

°C/W

Rj-a = 40

°C/W

Rj-a = 50

°C/W

Rj-a = 60

°C/W

0

20

40

60

80

100

-90

-70

-50

-30

-10

10

30

50

70

90

Angle (º)