2

ChArACtEristiCs

Characteristics

unit

Minimum

typical

Maximum

viewing angle (FWHM)

degrees

115

eSD withstand voltage (JeDeC JS-001-2012)

v

Class 3A

DC forward current

mA

3300*

Reverse current

mA

0.1

Forward voltage (@ 1400 mA, T

v

34.0

37.4

*

Refer to the Operating Limits section.

oPErAting LiMits

The maximum current rating of the CMA2550 depends on the case temperature (Tc) when the LeD has reached thermal equilibrium

under steady-state operation. The graph shown below assumes that the system design employs good thermal management (thermal

interface material and heat sink) and may vary when poor thermal management is employed. either solder pad shown in the Mechanical

Dimensions section on page 13 can be used as the Tc measurement point.

Another important factor in good thermal management is the temperature of the Light emitting Surface (LeS). Cree recommends a

maximum LES temperature of 140 °C to ensure optimal LED lifetime. Please refer to the Thermal Design section on page 14 for more

information on LeS temperature measurement.

CMA2550

0

500

1000

1500

2000

2500

3000

3500

0

25

50

75

100

125

150

Case Temperature (°C)

85 °C, 3300 mA

125 °C, 1269 mA