TM
EV1528DQ-00A
9 Lamp, 20mA Preciscion
WLED Driver Evaluation Board
The Future of Analog IC Technology
TM
GENERAL DESCRIPTION
The EV1528DQ-00A evaluation board is
designed for driving up to nine (9) series
WLEDs from a single cell Lithium Ion battery.
The board is set up to obtain 20mA LED
current. The current can be adjusted by varying
the resistor R1.
The MP1528 uses current limited, variable
frequency architecture to regulate the LED
current while maintaining high efficiency. The
BIAS pin measures the output voltage and turns
off the converter if an over voltage condition is
present to prevent damage due to an open
circuit condition. The LED current is measured
with an external current sense resistor. The low
0.4V full-scale regulation threshold and 0.4Ω
power switch minimize power loss to improve
efficiency. Either a DC voltage or a PWM signal
at the BRT input can control the LED
brightness.
FEATURES
•
•
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2.7V to 5.5V Input Voltage Range
Drives up to 9 Series White LEDs
Analog and Digital PWM Brightness Control
Through BRT
Surface-Mount Components
Fully Assembled and Tested
Handheld Computers
PDAs
PDA Phones
Digital and Video Cameras
Small LCD Displays
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
ELECTRICAL SPECIFICATIONS
Parameter
Input Voltage
# of WLEDs
LED Current
Symbol
V
IN
I
LED
Value
2.7 – 5.5
7–9
20
Units
V
mA
EV1528DQ-00A EVALUATION BOARD
Efficiency vs
Load Current
90
80
V
IN
=
5V
4.2V
3.6V
3V
EFFICIENCY (%)
70
60
50
(L x W x H) 2.0” x 1.5” x 0.5”
(5.0cm x 3.8cm x 1.4cm)
Board Number
EV1528DQ-00A
MPS IC Number
MP1528DQ
40
0
5
10
15
20
LED CURRENT (mA)
25
MP1528_EC01
EV1528DQ-00A Rev. 1.0
10/11/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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