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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
Flas h/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
V
OUT
in 2X mode
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
