SIPEX SP6137EU

SP6137LED
Evaluation Board Manual
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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
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.
VIN 12V
1
1
1
1
R6
499
VCC
5.1V
1/4W,
1206
C1
1uF
16V, 0805
D1
BZT52C5V1S
5.1V,
SOD-323
R2
24.3K
0603
1
1
C2
10uF
6.3V
0805
1
6
7
VSS
5
R4
1k
0603
4
C4
1uF
10V
0603
U1
SP6137
VCC
BST
UVIN
GH
SS
COMP
SWN
GND
VFB
GL
D2
MBR0530
SOD-123 U2
10
9
8
2
Si5902DC
8
C3
1uF 1
10V, 0603
2
7
6
3
5
4
1
L1 4.7uH
2
SD43-4R7M
D3
1W/3W/5W
J1 setup:
J1 no hat:
J1 at 1&2:
J1 at 2&3
R1,R3,R5:
J1
1W LumiLED
5W LumiLED
3W LumiLED
1206, 1%, SMD
2
SP6137LED Evaluation Board Manual
1
VOUT
1
C5
1uF
16V, 0805
3
200mV
Rev 12/05/03
1
1
1
VFB
1
R5 0.56
2
R1 0.56
3
R3 0.33
Copyright 2003 Sipex Corporation
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 (R2 and R4)
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
V
Rb = FB
IF
where VFB is set as 200mV, IF is the operating current of the LumiLED.
For 1W application, IF=350mA, Rb=R1=0.56Ohm
For 5W application, IF=700mA, Rb=R1//R5=0.28Ohm
For 3W application, IF=1000mA, Rb=R1//R3=0.2Ohm
POWER SUPPLY DATA
For the standard evaluation board, the following chart shows the efficiency data for different
applications.
100
98
96
Efficiency (%)
94
92
1W
3W
5W
90
88
86
84
82
80
78
Single
Two
Three
Fig. 1 Efficiency data of the SP6137LED evaluation board
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EVALUATION BOARD LAYOUT
FIGURE 1: SP6137LEDEB COMPONENT PLACEMENT
FIGURE 2: SP6137LEDEB PC LAYOUT TOP SIDE
FIGURE 3: SP6137LEDEB PC LAYOUT BOTTOM SIDE
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TABLE1: SP6137LEDEB LIST OF MATERIALS
Ref. Des.
Qty.
U1
U2
C1, C5
C2
C3, C4
L1
D1
D2
D3
R1, R5
R3
R2
R4
R6
R7
J1
1
1
2
1
2
1
1
1
1
2
1
1
1
1
1
1
SP6137 Buck for LumiLED List of Materials
Manufacturer
Part Number
Layout Size
LxWxH
Sipex Corp.
SP6137
MSOP-10
Vishay
Si5902DC
1206-8 ChipFET
TDK Corp
C2012X5R1C105K
805
TDK Corp
C2012X5R0J106M
805
TDK Corp
C1608X5R1A105K
603
Easy Magentic
SD43-4R7M
4X4.5X3.2
ON Semin
MBR0530
SOD-123
Diodes Inc.
BZT52C5V1S
SOD-323
LumiLEDs
Panasonic
1206
Panasonic
1206
Panasonic
603
Panasonic
603
Panasonic
1206
Panasonic
603
Component
Vendor
900kHz Dual Supply Synchronous Buck
Dual N-Channel 30V MOSFET
1uF/16V/X5R/10% Ceramic
10uF/6.3V/X5R/ Ceramic
1uF/10V/X5R/ Ceramic
4.7uH 2.43A 0.1 Ohm SM Inductor
0.5A Schottky
5.1V SMD zener diode
Open
0.56 Ohm 1/4W 1% 1206 SM
0.33 Ohm 1/4W 1% 1206 SM
24.3K Ohm 1/16W 1% 0603 SM
1K Ohm 1/16W 1% 0603 SM
499 Ohm 1/4W 5% 1206 SM
5 Ohm 1/16W 1% 0603 SM
3-Pin Jumper
Sipex 978-667-8700
Vishay
TDK 847-803-6100
TDK 847-803-6100
TDK 847-803-6100
Easy Magnetic
800-388-8731
Diodes Inc.
LumiLEDs
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
ORDERING INFORMATION
Model
Temperature Range
Package Type
SP6137LEDEB............................. -40°C to +85°C...................SP6137LED Evaluation Board
SP6137EU.....................................-40°C to +85°C...................................... 10-pin µSOIC
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