EV2481-H-00A
1.2A, 36V, 1.4MHz
Whit e LED Driver Buck/Boost Halogen Replacement
Evaluation Board
EV2481-H-00A Rev. 1.01 www.MonolithicPower.com 1
4/25/2012 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-00A is a Buck converter evaluation
board for the MP2481, a wide input step-down
converter designed for driving high-power white
LEDs with up to 1A capability.
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 6V to 36V Operating Input Range for
Step-Down Applications
• Drives one 5W White LED
• Up to 87% 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
• General LED Illumination
ELECTRICAL SPECIFICATION
Parameter Symbol Value Units
Input Voltage V
IN
6-36 V
# of WLEDs 1
LED Current I
LED
1 A
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-00A 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-00A MP2481DH
Efficiency vs.
Input Voltage
60
010203040
65
70
75
80
85
90
95
EFFICIENCY (%)
INPUT VOLTAGE (V)