Rev 12/05/03
SP6137LED Evaluation Board Manual Copyright 2003 Sipex Corporation
DESCRIPTION AND BOARD SCHEMATIC
The SP6137LED Evaluation Board is designed to help the user evaluate the performance of
the SP6137 for use as a Luxeon 1W/3W/5W Driver. The evaluation board is a completely
assembled and tested surface mount board which provides easy probe access points to all
SP6137 inputs and outputs so that the user can quickly connect and measure electrical
characteristics and waveforms.
Ideal for Automotive or 12V Bus
Application
Single Board for 1W, 3W and 5W
Applications
High
Efficiency
Small 10-Pin MSOP Package
900kHz Switching Frequency
Enables Small Components
Integrated Design with Minimal
Components.
Dual MOSFET for Spacing Saving
SP6137LED
Evaluation Board Manual
VIN
1
1
5.1V
J1 setup:
J1 no hat: 1W LumiLED
J1 at 1&2: 5W LumiLED
J1 at 2&3 3W LumiLED
R1,R3,R5: 1206, 1%, SMD
16V, 0805
200mV
R6
499
R4
1k
5.1V,
SOD-323
C1
1uF
VSS
1
1
1/4W,
1206
VOUT
1
1
SOD-123
R3
0.33
C2
10uF
U1
SP6137
6
5
7
4
8
9
10
2
3
1
UVIN
COMP
SS
VFB
SWN
GH
BST
GL
GND
VCC
J1
1
2
3
16V, 0805
L1
1
2
4.7uH
R2
24.3K
D2
MBR0530
12V
D3
1W/3W/5W
1
2
10V, 0603
10V
0603
C5
1uF
C3
1uF
VCC
1
1
6.3V
0805
VFB
1
1
0603
D1
BZT52C5V1S
0603
C4
1uF
SD43-4R7M
R5
0.56
R1
0.56
U2
Si5902DC
8
7
2
6
5
3
4
1
2
USING THE EVALUATION BOARD
1) Powering Up the SP6137LED Circuit
The SP6137LED Evaluation Board can be powered from a 12V power supply or from 8 alkaline
cells. Connect with short leads directly to the "VIN" and "GND" posts. Plug the 1W/3W/5W
Luxeon LumiLED between the "VOUT" and "VFB" posts. Refer to section 2 for Jumper (J1)
setup for different LumiLED applications.
2) Using the J1 Jumper for different LumiLED Applications
The SP6137LED Evaluation Board can be used to drive 1W, 3W or 5W LumiLED respectively,
this can be done by using the J1 Jumper. When no hat was used for the J1, it is setup for 1W
application. When the hat is put on 1 & 2 position, it is used for 5W application. When the hat is
put on 2 & 3 position, it is used for 3W application.
3) Selecting the Bias Resistor
The feedback voltage was programmed to be 200mV by using two divider resistors (R
2
and R
4
)
at the soft start pin. (The internal 0.8V reference was overwritten by the programmed 0.2V to
reduce the sense voltage and increase the efficiency). The bias resistor is used to set the
operating current of the LumiLED as equation
F
FB
b
I
V
R
=
where V
FB
is set as 200mV, I
F
is the operating current of the LumiLED.
For 1W application, I
F
=350mA, R
b
=R
1
=0.56Ohm
For 5W application, I
F
=700mA, R
b
=R
1
//R
5
=0.28Ohm
For 3W application, I
F
=1000mA, R
b
=R
1
//R
3
=0.2Ohm
POWER SUPPLY DATA
For the standard evaluation board, the following chart shows the efficiency data for different
applications.
78
80
82
84
86
88
90
92
94
96
98
100
Single
Two
Three
Ef
fi
c
i
en
cy
(
%
)
1W
3W
5W
Fig. 1 Efficiency data of the SP6137LED evaluation board
3
EVALUATION BOARD LAYOUT
FIGURE 1: SP6137LEDEB COMPONENT PLACEMENT
FIGURE 2: SP6137LEDEB PC LAYOUT TOP SIDE
FIGURE 3: SP6137LEDEB PC LAYOUT BOTTOM SIDE
4
TABLE1: SP6137LEDEB LIST OF MATERIALS
SP6137 Buck for LumiLED List of Materials
Ref. Des.
Qty.
Manufacturer
Part Number
Layout Size
Component
Vendor
LxWxH
U1
1
Sipex Corp.
SP6137
MSOP-10
900kHz Dual Supply Synchronous Buck
Sipex 978-667-8700
U2
1
Vishay
Si5902DC
1206-8 ChipFET
Dual N-Channel 30V MOSFET
Vishay
C1, C5
2
TDK Corp
C2012X5R1C105K
805
1uF/16V/X5R/10% Ceramic
TDK 847-803-6100
C2
1
TDK Corp
C2012X5R0J106M
805
10uF/6.3V/X5R/ Ceramic
TDK 847-803-6100
C3, C4
2
TDK Corp
C1608X5R1A105K
603
1uF/10V/X5R/ Ceramic
TDK 847-803-6100
L1
1
Easy Magentic
SD43-4R7M
4X4.5X3.2
4.7uH 2.43A 0.1 Ohm SM Inductor
Easy Magnetic
D1
1
ON Semin
MBR0530
SOD-123
0.5A Schottky
800-388-8731
D2
1
Diodes Inc.
BZT52C5V1S
SOD-323
5.1V SMD zener diode
Diodes Inc.
D3
1
LumiLEDs
Open
LumiLEDs
R1, R5
2
Panasonic
1206
0.56 Ohm 1/4W 1% 1206 SM
800-Digi-Key
R3
1
Panasonic
1206
0.33 Ohm 1/4W 1% 1206 SM
800-Digi-Key
R2
1
Panasonic
603
24.3K Ohm 1/16W 1% 0603 SM
800-Digi-Key
R4
1
Panasonic
603
1K Ohm 1/16W 1% 0603 SM
800-Digi-Key
R6
1
Panasonic
1206
499 Ohm 1/4W 5% 1206 SM
800-Digi-Key
R7
1
Panasonic
603
5 Ohm 1/16W 1% 0603 SM
800-Digi-Key
J1
1
3-Pin Jumper
800-Digi-Key
ORDERING INFORMATION
Model
Temperature Range
Package Type
SP6137LEDEB............................. -40
C to +85C...................SP6137LED Evaluation Board
SP6137EU.....................................-40
C to +85C...................................... 10-pin SOIC
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