SP6652LED Datasheet, PDF (1/4 Pages) Sipex Corporation – Evaluation Board Manual

SP6652LED
Evaluation Board Manual
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
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.
VIN=3.0~5.5V
RVIN
10.0
CIN
10uF
L1 4.7uH
U1 SP6652
10 _LX
PGND ¹
9 _{PVIN SGND} 2
8 _SVIN
FB ³
7 _{SYNC COMP} 4
6 _{MODE SD} 5
CVIN
1.0uF
J1
1
2
3
SHDN
VOUT
1W or 3W Luxeon
0.75V
Rz
100
Cc
10nF
10uF
COUT
R3
5
U2
+1
4 _OUT LMV321
2 ^-3
R2
280K
140K
R4 R4 Open: 1W
0 _{R4 Short: 3W}
Vref
Rb1 Rb2
R1
100mOhm
10K
Date: 05/15/06 RevA
SP6652LED Evaluation Board Manual
Copyright 2006 Sipex Corporation