Rev 04/19/05

SP6686EB Evaluation Board Manual

Copyright 2005 Sipex Corporation

DESCRIPTION AND BOARD SCHEMATIC

The SP6686EB Evaluation Board is a compact circuit including the SP6686 in 3x3mm DFN

and 3 small 0603 capacitors which can provide a stable drive current for a 1W LED such as the

AOT White LED, Lumi-LEDs Luxeon I or PWF1 type light sources. The evaluation board is a

completely assembled and tested surface mount board which provides easy probe access

points to all SP6686 inputs and outputs so that the user can quickly connect and measure

electrical characteristics and waveforms.

SP6686EB Schematic

J2

1

2

3

D1

1W LED

Cout

2.2uF

CF

.47uF

Vin: 3.0-4.2V

SP6686

Vin

1

C1

2

IFB

7

ISET

6

EN

5

FLASH

4

C2

3

SGND

8

PGND

9

VOUT

10

R SET

106K

R EN

10K

Cin

4.7uF

R FB

0.33Ohm

SW1

Push ON

Vfb=50mV Torch 150mA

132mV Flash 400mA

TO GET STARTED:

1. Connect VIN from VIN to GND (VIN range 2.7V to 4.2V).

2. Select mode between TORCH and FLASH by putting jumper into corresponding position.

3. Apply High to ON terminal to turn the LED on.

2.7V to 5.5V Input Range

Typical 150mA Torch or 400mA

Flash Output Current

High Efficiency in 1X mode, high

Small 3x3mm 10-Pin DFN Package

2.4MHz Switching Frequency

Enables Small Components

Integrated Design with Minimal

Components.

Use with 1 cell Lithium Ion Battery

SP6686EB

Evaluation Board Manual