Date: 05/15/06 RevA

SP6652LED Evaluation Board Manual

Copyright 2006 Sipex Corporation

DESCRIPTION AND BOARD SCHEMATIC

The SP6652LED Evaluation Board is a compact circuit that was built on SP6652 and can

provide a stable drive current for a 1W or 3W Luxeon type light source. The SP6652 is an

integrated synchronous buck regulator configured to provide constant output current for this

application. The evaluation board is a completely assembled and tested surface mount board

which provides easy probe access points to all SP6652 inputs and outputs so that the user can

quickly connect and measure electrical characteristics and waveforms.

3V to 5.5V Input Range

Accurate 350mA or 900mA Output

Current

High Efficiency

Small 10-Pin MSOP Package

1.2MHz Switching Frequency

Enables Small Components

Integrated Design with Minimal

Components.

Use 4 cell alkaline, NiCad, NiMH, or 1

cell Lithium Ion Battery or 3.3V or 5V

Logic supply

3

LMV321

1

3

4

+

-

OUT

2

2

Rb1

L1 4.7uH

Vref

Rb2

100mOhm

R2

140K

U2

R4 Open: 1W

R4 Short: 3W

R4

0

0.75V

COUT

10uF

SP6652

U1

1

2

3

4

5

6

7

8

9

10

PGND

SGND

FB

COMP

SD

MODE

SYNC

SVIN

PVIN

LX

CIN

10uF

R3

280K

RVIN

10.0

J1

R1

10K

5

SHDN

1W or 3W Luxeon

Cc

10nF

VOUT

VIN=3.0~5.5V

1

CVIN

1.0uF

Rz

100

SP6652LED

Evaluation Board Manual