19

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.

Thermal Design

0

500

1000

1500

2000

2500

3000

0

20

40

60

80

100

120

140

160

Ambient Temperature (ºC)

Rj-a = 2°C/W

Rj-a = 4°C/W

Rj-a = 6°C/W

Rj-a = 8°C/W

6 V

0

250

500

750

1000

1250

1500

0

20

40

60

80

100

120

140

160

Ambient Temperature (ºC)

Rj-a = 2°C/W

Rj-a = 4°C/W

Rj-a = 6°C/W

Rj-a = 8°C/W

12 V