MP1038 Datasheet, PDF (1/1 Pages) Monolithic Power Systems – Full Bridge CCFL Controller

TM
The Future of Analog IC Technology ^TM
MP1038
Full Bridge
CCFL Controller
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.
TYPICAL APPLICATION
FEATURES
• 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.
DBRT
ABRT
ENSYNC
LOK
1
SI
28
PGL
2
LI
27
LGL
3
LV
26
VCCL
4
COMP
25
OUTL
5
AG
24
UGL
6
FT
23
BTL
7
LCS
22
PRL
8
LCC
21
PGR
9
BRC
20
LGR
10
BRS
19
VCCR
11
DBRT
18
OUTR
12
ABRT
17
UGR
13
16
ENSYNC BTR
14
LOK
15
PRR
GND
V_PS
MP1038_TA01
MP1038 Rev. 1.9w
www.MonolithicPower.com
1
12/20/2005
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.