http://www.optosupply.com

VER A.0

T

c

L

D

O

E

VER . 1

■

Heat design

The following pictures show some measurements of mounted 5W Led on the heat sink for each board A and B (See Fig 1) with

using thermograph to make an observation about heat distribution. Each boards is tested at various current conditions.

As a result, LED needs larger heat sink as much as possible to reduce its own case temperature.

Fig. 1

Configuration pattern examples for board assembly

Board

LED power

Material

Surface area (m㎡)

Min.

A

5W

Al

20,600

B

10W

Al

41,200

C

25W

Al

103,000

D

50W

Al

206,000

E

100W

Al

412,000

F

200W

Al

824,000

G

300W

Al

1236,000

Above tested LED device is attached with adhesive sheet to the heatsink.

For reference's sake, Tj absolute maximum rating is defined at 115℃ as a prerequisite on design process of 5W LED.

<Fig.2> Board A (surface area=10,300m㎡)

<Fig.3> Board B (surface area=20,600m㎡)

IF=600mA

IF=600mA

LED & Application Technologies