TM
MP1038
Full Bridge
CCFL Controller
The Future of Analog IC Technology
TM
DESCRIPTION
The MP1038 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 one or more cold
cathode fluorescent lamps (CCFL) 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 CCFL.
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. The built-in burst oscillator
can be synchronized with an external clock to
minimize display scan interference. Burst mode or
analog mode dimming is 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. Built-in
current limits for the external switches protect
against inadvertent shorts. The MP1038 is available
in TSSOP28 and SOIC28 packages.
FEATURES
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Controls Four External, Low Cost, N-Channel
MOSFETs
Fixed Operating Frequency
Input Voltage Range of 10V to 32V
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
APPLICATIONS
Desktop LCD Flat Panel Displays
Flat Panel Video Displays
LCD TVs and Monitors
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
The MP1038 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
MP1038
LCS
LCC
BRC
BRS
DBRT
ABRT
PRL
PGR
LGR
VCCR
OUTR
UGR
BTR
PRR
DBRT
ABRT
ENSYNC
LOK
11
12
13
14
ENSYNC
LOK
V
PS
MP1038_TA01
MP1038 Rev. 1.9w
12/20/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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MPS [ MONOLITHIC POWER SYSTEMS ]
