MP1038
Full Bridge
CCFL Controller
MP1038 Rev. 1.9w www.MonolithicPower.com 1
12/20/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP1038 is a fi xed operating f requency inve rter
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 ope rati ng freque ncy 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 contro lled with an external
analog signal. Built-in fault management features
include an open lamp regulator, a transformer
secondary peak current regulator, and a dual-mod e
fault timer. The secondary o ver-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
• 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 Fu ture of A nalog IC T echno logy ” are T radem arks o f Mon olithic
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
MP1038
SI
LI
LV
COMP
AG
FT
LCS
LCC
BRC
BRS
DBRT
ABRT
ENSYNC
LOK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PGL
LGL
VCCL
OUTL
UGL
BTL
PRL
PGR
LGR
VCCR
OUTR
UGR
BTR
PRR
GND
V
PS
MP1038_TA01
DBRT
ABRT
ENSYNC
LOK
