EV2481-H-01A
1.2A, 36V, 1.4MHz
Whit e LED Driver Buck/Boost Halogen Replacement
Evaluation Board
EV2481-H-01A Rev. 1.01 www.MonolithicPower.com 1
4/28/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EV2481-H-01A is a Buck-Boost converter
evaluation board for the MP2481, a wide input
step-up/down converter designed for driving up
to 27 white LEDs. The EV board parameters are
optimized for the load of 3 white LEDs in series,
9 strings paralleled.
The MP2481 is a 1.2A output, 36V white LED
driver suitable for either step-down or inverting
step-up/down applications. It achieves 1.2A peak
output current over a wide input supply range
with excellent load and line regulation. Current
mode operation provides fast transient response
and eases loop stabilization. Fault condition
protection includes thermal shutdown, cycle-by-
cycle peak current limiting, open LED protection
and output short circuit protection.
The MP2481 incorporates both DC and PWM
dimming onto a single control pin. The separate
input reference ground pin allows for direct
enable and/or dimming control for a positive to
negative power conversion.
The MP2481 requires a minimum number of
readily available standard external components
and is available in 8-pin MSOP8 packages.
FEATURES
• Wide 4.5V to 26V Operating Input Range for
Inverting Step-up/down Applications
• Drives up to 27 White LEDs
• Up to 85% Efficiency
• Analog and PWM Dimming
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown Protection
• Open Strings Protection
• Input Over Voltage Protection
• Output short circuit protection
APPLICATIONS
• WLED Backlights
ELECTRICAL SPECIFICATION
Parameter Symbol Value Units
Input Voltage V
IN
4.5-26 V
# of WLEDs
27(3 in series, 9
strings paralleled)
LED Current I
LED
180 mA
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
EV2481-H-01A EVALUATION BOAR D
(L x W x H)2.0” x1.8” x0.2”
(5.0cm x4.5cm x0.5cm)
Board Number MPS IC Number
EV2481-H-01A MP2481
Efficiency vs.
Input
Step-up/down
Application
3 WLEDs, 9 Strings
Voltage
60
65
0 5 10 15 20 25 30
70
75
80
85
90
EFFICIENCY (%)
INPUT VOLTAGE (V)
EVALUATION BOARD SCHEMATIC
