Date: 05/15/06 RevA

SP6652LED Evaluation Board Manual

Copyright 2006 Sipex Corporation

Page 2 of 4

USING THE EVALUATION BOARD

1) Powering Up the SP6652LED Circuit

The SP6652LED Evaluation Board can be powered from 4 cell alkaline, NiCad, NiMH, or 1 cell

Lithium Ion Battery or 3.3V or 5V Logic supply. Connect with short leads directly to the “VIN”

and “GND” posts. Plug the 1W Luxeon I or 3W Luxeon III between the “VOUT” and “Vref” posts.

2) Using the J1 Jumper for ON/OFF Control

When the hat is put on 1 & 2 position, the SHDN pin is connected to Vin. When the hat is put on

2 & 3 position, the SHDN pin is tied to ground and the part will be in shutdown mode.

3) Select from 1W or 3W Application

The board was set up for 1W application as default. In this application, R4 was open. When the

customer need to use this board to drive Luxeon III, short R4 by using a 0 Ohm resistor.

POWER SUPPLY DATA

For the standard evaluation board, the following chart shows the efficiency data for different

applications.

SP6652LED 3 or 4 Cell to 1W LumiLEDs

70

75

80

85

90

95

100

2.8

3.2

3.6

4.0

4.4

4.8

5.2

5.6

6.0

Vin (V)

0

50

100

150

200

250

300

350

400

1W Efficiency

1W Iout

SP6652LED 3 or 4 Cell to 3W LumiLEDs

70

75

80

85

90

95

100

2.8

3.2

3.6

4.0

4.4

4.8

5.2

5.6

6.0

Vin (V)

0

100

200

300

400

500

600

700

800

900

1000

3W Efficiency

3W Iout

Fig. 1 Efficiency data of the SP6652LED evaluation board