MPS EV1527DR-02A

EV1527DR-02A
1.3MHz Low Power
LED Torch/Flash Driver
The Future of Analog IC Technology
EVALUATION BOARD
DESCRIPTION
FEATURES
The EV1527DR-02A evaluation board is
designed to drive a single Lumileds LED with
low, forward voltage for Camera Flash
applications. The board is set up to obtain
150mA torch current and 750mA flash current
with an input voltage range of 3.0V to 4.2V. The
torch and flash currents can be adjusted by
resistors R2 and R3 on the Evaluation Board.
•
•
The MP1527 switches at 1.3MHz and allows
the use of tiny, low cost capacitors and small
inductors. External compensation and soft-start
result in small inrush current and extend the
battery life. The MP1527 operates from an input
voltage as low as 2.6V.
ELECTRICAL SPECIFICATIONS
Parameter
Supply Voltage
LED Current (Torch)
LED Current (Flash)
Symbol
Value
Units
VIN
IOUT1
IOUT2
3.0 – 4.2
150
750
V
mA
mA
•
•
•
3V to 4.2V Input Voltage Range
Tiny Capacitors and Inductors Due to
1.3MHz Fixed Switching Frequency
Output LED Currents: 150mA at Torch
Mode, 750mA at Flash Mode
Surface-Mount Components
Fully Assembled and Tested
APPLICATIONS
•
•
•
•
•
•
Camera Phone Flash
Handheld Computers and PDAs
Digital Still and Video Cameras
External Modems
Small LCD Displays
White LED Drivers
“MPS” and “The Future of Analog IC Technology” are Registered
Trademarks of Monolithic Power Systems, Inc.
EV1527DR-02A EVALUATION BOARD
Load Transient
VIN = 3.6V (1 LED)
VFLASH
2V/div
0
VOUT
5V/div
(L x W x H) 2.0” x 2.2” x 0.5”
(5.0cm x 5.6cm x 1.0cm)
Board Number
MPS IC Number
EV1527DR-02A
MP1527DR
EV1527DR-02A Rev. 1.0
9/21/2005
0
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
EV1527DR-02A_WF01
1
EV1527DR-02A - 1.3MHZ LOW POWER LED TORCH/FLASH DRIVER
EVALUATION BOARD
EVALUATION BOARD SCHEMATIC
VIN
Q2
Q1
U1
FB
SS FAULT SGND
COMP
PGND
NC
PGND
MP1527
C2
47nF
BP
SW
EN
SW
SGND NC
C3
10nF
NC
LED1
D1
1N5819HW-7
1A, 40V
IN
FLASH
D2
NS*
EN
GND
* Note: Cut trace to install D2.
VIN
C6
NS
EV1527_S01
EV1527DR-02A BILL OF MATERIALS
Qty
Ref
Value
Description
1
C1
0.1µF
Ceramic Capacitor, 16V, X7R
0603
1
C2
47nF
Ceramic Capacitor, 25V, X7R
0603
1
C3
10nF
Ceramic Capacitor, 50V, X7R
0603
1
C4
4.7µF
Ceramic Capacitor, 10V, X5R
1210
1
C5
10µF
Ceramic Capacitor, 10V, X7R
1210
1
C6
Not Stuffed
1
D1
Schottky Diode, 1A, 40V
1
D2
Not Stuffed
1
L1
1
LED1
EV1527DR-02A Rev. 1.0
9/21/2005
3.0µH Inductor, 2.4A
Package
SOD123
S
Manufacturer
Part Number
AVX:
0603YC104KAT
AVX:
06033C473KAT
AVX:
06035C103KAT
AVX:
1210YD475KAT2W
AVX:
1210YD106KAT2W
Diodes Inc.:
1N5819HW-7
Sumida:
CDRH5D28-3R0NC
Not Stuffed
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
2
EV1527DR-02A - 1.3MHZ LOW POWER LED TORCH/FLASH DRIVER
EVALUATION BOARD
EV1527DR-02A BILL OF MATERIALS (continued)
Qty
Ref
2
Q1, Q2
3
R1, R5, R6
100kΩ Resistor, 5%
0603
1
R2
8.06Ω Resistor, 1%
0805
1
R3
2.0Ω
Resistor, 5%
1210
1
R4
220Ω
Resistor, 5%
0603
1
U1
EV1527DR-02A Rev. 1.0
9/21/2005
Value
Description
Package
N-Channel MOSFET, 4.5A, 20V
SOT23-6
Step-Up Converter
QFN16
Manufacturer
Part Number
Zetex Inc.:
ZXMN2A03E6TA
Panasonic:
ERJ-3GEYJ104V
Yageo:
9C08052A8R06FGHFT
Panasonic:
ERJ-14YJ2R0U
Panasonic:
ERJ-3GEYJ221V
MPS:
MP1527DR
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
3
EV1527DR-02A - 1.3MHZ LOW POWER LED TORCH/FLASH DRIVER
EVALUATION BOARD
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer
Figure 2—Top Layer
Figure 3—Bottom Layer
EV1527DR-02A Rev. 1.0
9/21/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
4
EV1527DR-02A - 1.3MHZ LOW POWER LED TORCH/FLASH DRIVER
EVALUATION BOARD
QUICK START GUIDE
1. Connect a Lumileds DS25 to LED terminals on the EV1527DR-02A board.
2. Preset the power supply to 3V - 4.2V.
3. Turn the power supply off.
4. Connect the power supply terminals to:
a. Positive (+): VIN
b. Negative (–): GND
5. Connect EN to VIN.
6. Turn on the power supply after making said connections.
7. The MP1527 is enabled on the demo board once VIN is applied.
8. Drive FLASH of Q1 with a pulsed signal (3V or above for High, 0V for Low) to switch between
two (2) LED currents.
9. IOUT1 is set to 150mA on the board.
10. IOUT2 is set to 750mA on the board.
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EV1527DR-02A Rev. 1.0
9/21/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5