MP1048
Full Bridge
CCFL Controller
The Future of Analog IC Technology
DESCRIPTION
The MP1048 is a fixed operating frequency
inverter controller that controls four external
N-Channel power MOSFETs in a full-bridge
configuration. The inverter is designed to power
up to 6 cold cathode fluorescent lamps (CCFLs)
to backlight liquid crystal displays. Its full-bridge
architecture converts unregulated DC input
voltages to the nearly pure sine waves required
to ignite and operate CCFLs.
For reliable lamp ignition, the operating
frequency is set by an external resistor and
during startup is temporarily swept toward the
unloaded resonant frequency of the tank. Burst
mode or analog mode dimming are controlled
with an external analog signal. Built-in fault
management features include an open lamp
regulator, a transformer secondary peak current
regulator and a dual-mode fault timer. The
secondary over-current timeout can be
shortened with external components. The
MP1048 is available in TSSOP28 and SOIC28
packages.
FEATURES
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Capable of Driving up to 6 Lamps
Controls Four External, Low Cost, N-Channel
MOSFETs
Fixed Operating Frequency
Input Voltage Range of 10V to 22V
Lamp Current and Voltage Regulation
Full-Wave Sense Amp
Analog and Burst Mode Dimming Control
Integrated Burst Mode Oscillator and Modulator
Soft-On and Soft-Off Burst Envelope
Open Lamp Protection
Secondary Over-Current Protection
Dual-Mode Fault Timer
Available in TSSOP28 and SOIC28 Packages
Desktop LCD Flat Panel Displays
Monitors
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
The MP1048 is covered by US Patents 6,683,422, 6,316,881, and 6,114,814.
Other Patents Pending.
TYPICAL APPLICATION
1
2
3
4
5
6
7
8
9
10
SI
LI
LV
COMP
AG
FT
PGL
LGL
VCCL
OUTL
UGL
BTL
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
MP1048
LCS
LCC
BRC
BRS
DBRT
ABRT
EN
NC
PRL
PGR
LGR
VCCR
OUTR
UGR
BTR
PRR
DBRT
ABRT
EN
11
12
13
14
V
PS
MP1048 Rev. 0.9
9/24/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
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MPS [ MONOLITHIC POWER SYSTEMS ]
