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www.DataSheet4U.com
The Future of Analog IC Technology
DESCRIPTION
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
VIN
IOUT1
IOUT2
Value
3.0 – 4.2
150
750
Units
V
mA
mA
EV1527DR-02A
1.3MHz Low Power
LED Torch/Flash Driver
EVALUATION BOARD
FEATURES
• 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)
(L x W x H) 2.0” x 2.2” x 0.5”
(5.0cm x 5.6cm x 1.0cm)
Board Number
EV1527DR-02A
MPS IC Number
MP1527DR
0
0
VFLASH
2V/div
VOUT
5V/div
EV1527DR-02A_WF01
EV1527DR-02A Rev. 1.0
9/21/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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EV1527DR-02A - 1.3MHZ LOW POWER LED TORCH/FLASH DRIVER
EVALUATION BOARD
EVALUATION BOARD SCHEMATIC
VIN Q2
C2
47nF
EN
GND
VIN
C3
10nF
U1 FB
COMP
SS FAULT SGND
PGND
NC PGND
MP1527
BP SW
EN SW
SGND NC NC IN
D1
1N5819HW-7
1A, 40V
D2
NS*
LED1
Q1
FLASH
* Note: Cut trace to install D2.
C6
NS
EV1527_S01
EV1527DR-02A BILL OF MATERIALS
Qty Ref
1 C1
1 C2
1 C3
1 C4
1 C5
1 C6
1 D1
1 D2
1 L1
1 LED1
Value Description
0.1µF Ceramic Capacitor, 16V, X7R
47nF Ceramic Capacitor, 25V, X7R
10nF Ceramic Capacitor, 50V, X7R
4.7µF Ceramic Capacitor, 10V, X5R
10µF Ceramic Capacitor, 10V, X7R
Not Stuffed
Schottky Diode, 1A, 40V
Not Stuffed
3.0µH Inductor, 2.4A
Not Stuffed
Package
0603
0603
0603
1210
1210
Manufacturer
Part Number
AVX:
0603YC104KAT
AVX:
06033C473KAT
AVX:
06035C103KAT
AVX:
1210YD475KAT2W
AVX:
1210YD106KAT2W
SOD123
Diodes Inc.:
1N5819HW-7
S
Sumida:
CDRH5D28-3R0NC
EV1527DR-02A Rev. 1.0
9/21/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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