P
A T E N T
P
E N D I N G
LIN D
O C
#:
1597
LXM1597-01
5V
T
H E
CCFL
I
N V E R T E R
M
O D U L E S
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
Not recommended for New Designs
K E Y F E AT U R E S
s
15 to 30% More Light Output
s
Closed Loop, Fully Regulating Design
s
4.5V To 7V Input Voltage Range
s
Versatile Brightness Control Input
s
3 MicroAMP Sleep Current
s
Output Short Circuit Protection And
Automatic Over-Voltage Limiting
s
8mm Max. Height, Narrow Footprints
s
Single Sided PCB Is Self Insulating
DESCRIPTION
LXM1597-01 CCFL (cold cathode florescent
lamp) Inverter Modules are specifically de-
signed for driving LCD back light lamps in
applications where dimmability, ultra-high
efficiency, high light output, low noise emis-
sions, reliable fail safe design, and small form
factors are critical parameters. Both mono-
chrome and color displays are supported.
The modules convert unregulated DC
voltage from the system battery or AC
adapter directly to high-frequency, high-
voltage sine waves required to ignite and
operate CCFL lamps. The module design is
based on a proprietary Linfinity IC that pro-
vides important new performance advances.
Remarkable improvements in efficiency
and RF emissions result from its
single
stage
resonant inverter featuring a patent pend-
ing Current Synchronous, Zero Voltage
Switching (CS-ZVS) topology. CS-ZVS pro-
duces nearly pure sine wave currents in the
lamp enabling maximum light delivery while
reducing both conducted and radiated noise.
This topology simultaneously performs
three tasks consisting of line voltage regu-
lation, lamp current regulation, and lamp
dimming in a single power stage made up
of two pairs of low loss FET's. The FET's
drive an LC resonant circuit that feeds the
primary of a high voltage transformer with
a sinusoidal voltage.
Required L and C values in the resonant
circuit are such that very low loss compo-
nents can be used to obtain higher electri-
cal efficiency than is possible with previous
topologies.
The full bridge LXM1597-01 is optimized
to efficiently operate with up to 4 watt lamps
at input voltages of 5 volts. This module
will operate over the full 4.5V to 7V input
voltage range.
The modules are equipped with a dim-
ming input that permits full range bright-
ness control from an external potentiom-
eter, and a sleep input that reduces module
power to a few microwatts in shut down
mode.
All modules feature output open and short
circuit protection.
APPLICATIONS
s
Notebook And Sub-Notebook Computers
s
Personal Digital Assistants
s
Portable Instrumentation
s
Automotive Displays
s
Desktop Displays
s
Airline Entertainment Centers
BENEFITS
s
Ultra-High Efficiency, Line Voltage
Regulation And Sleep Mode Extend
Computer Battery Life
s
Cool Operation PermitS Close Proximity
To LCD Panel Without Display Distortion
s
Smooth, Full-Range Brightness Control
Gives Your Product A High Quality Image
s
Low EMI / RFI Design Minimizes Shielding
Requirements
s
Narrow, Low-Profile Standard Modules Fit
Into Most LCD Enclosures
s
Single Sided PCB Saves Expensive High
Voltage Insulating Tapes
IMPORTANT:
For the most current data, consult LinFinity's web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
B
A C K L I G H T
I
N V E R T E R
L
I G H T
O
U T P U T
E
F F I C I E N C Y
C
O M P A R I S O N
50
45
40
Eff (Nits / Watts)
35
30
25
20
15
10
5
0
Computer 1
Computer 2
Computer 3
Linfinity
Stock
MODULE ORDER INFO
5V I N P U T
LXM1597-01
Copyright 漏 1998
Rev. 0.6a 10/00
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
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