Rev 02/23/05

SP6685EB Evaluation Board Manual

Copyright 2005 Sipex Corporation

DESCRIPTION AND BOARD SCHEMATIC

The SP6685EB Evaluation Board is a compact circuit including the SP6685 in 3x3mm DFN

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

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

SP6685 inputs and outputs so that the user can quickly connect and measure electrical

characteristics and waveforms.

SP6685EB Schematic

Cout

4.7uF

D1

PWF1

VFB = 50mV Torch 200mA

150mV Flash 700mA

Vin: 2.7-5.5V

Cin

10uF

SP6685

VIN

1

C1

2

FB

7

RSET

6

EN

5

FLASH

4

C2

3

SGND

8

PGND

9

VOUT

10

CF

1uF

RSET

88.7K

RSENSE

0.22ohms

Flash/Torch

ENABLE

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 4.2V Input Range

Typical 200mA Torch or 700mA

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

SP6685EB

Evaluation Board Manual