MPS MP2483 Quick Start Manual

The Future of Analog IC Technology

DESCRIPTION

The MP2483 is a 55V, 2.5A, white LED driver
suitable for either step-down or inverting
step-up/down applications. It achieves 2.5A
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, input over
voltage protection, open strings protection and
output short circuit protection.
The MP2483 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 MP2483 requires a minimum number of
readily available standard external components
and is available in 10-pin 3mm x 3mm QFN
packages.
MP2483DQ DEMO BOARDS
Operating
Board number
Mode
EV2483DQ-00A Buck
EV2483DQ-00B Buck-boost
EV2483DQ-00C Boost
ELECTRICAL SPECIFICATIONS
Parameter Symbol
Input Voltage V
IN
LEDs #
LED Current I
LED
EV2483DQ-00C Rev.1.1
04/26/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
Input ILED
LED#
(V) (mA)
15~50 3 700
12 3~5 500
12 6~9 500
Value Units
12 V
6~9
500 mA
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EV2483DQ-00C
2.5A, 55V, Programmable Frequency
White LED Driver Evaluation Board

FEATURES

•
2.5A Maximum Output Current
•
Unique Step-up/down Operation (Buck-
Boost Mode)
•
Wide 4.5V to 55V Operating Input Range for
Step-Down Applications (Buck Mode)
•
0.28Ω Internal Power MOSFET Switch
•
Adjustable Switching Frequency
•
Analog and PWM Dimming
•
0.198V Reference Voltage
•
5μA Shutdown Mode
•
No minimum LED required
•
Stable with Low ESR Output Ceramic
Capacitors
•
Cycle-by-Cycle Over Current Protection
•
Thermal Shutdown Protection
•
Open Strings Protection
•
Input Over Voltage Protection
•
Output Short Circuit Protection
•
Available in 10-Pin 3x3 QFN Package

APPLICATIONS

•
General LED Illuminations
•
LCD Backlight Panels
•
Handheld Computers
•
Automotive Internal Lighting
•
Portable Multimedia Players
•
Portable GPS Devices
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Monolithic Power Systems, Inc.
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