P
A T E N T
P
E N D I N G
LIN D
O C
#:
1598
LXM1598-01
12V CCFL I
T
H E
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
10V To 14V 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
DESCRIPTION
LXM1598-01 CCFL (cold cathode florescent
lamp) Inverter Modules are specifically de-
signed for driving LCD back light lamps in
applications where dimmability, ultrahigh
efficiency, high light output, low noise
emissions, reliable fail safe design, and
small form factors are critical parameters.
Both monochrome 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
provides important new performance ad-
vances.
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 radi-
ated noise. This topology simultaneously
performs three tasks consisting of line volt-
age regulation, lamp current regulation, and
lamp dimming in a single power stage
made up of one pair of low loss FET's.
The FET's drive an LC resonant circuit that
feeds the primary of a high voltage trans-
former 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 previ-
ous topologies.
The half bridge LXM1598-01 is optimized
to efficiently operate with up to 4 watt
lamps over the full 10V to 14V input volt-
age 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 mod-
ule 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
IMPORTANT:
For the most current data, consult LinFinity's web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
B
ACKLIGHT
I
NVERTER
L
IGHT
O
UTPUT
E
FFICIENCY
C
OMPARISON
50
45
40
Eff (Nits / Watt)
35
30
25
20
15
10
5
0
Computer 1
Computer 2
Computer 3
s
Narrow, Low-Profile Standard Modules Fit
Into Most LCD Enclosures
Linfinity
Stock
MODULE ORDER INFO
10V - 14V INPUT
LXM1598-01
Copyright 漏 1998
Rev. 0.8a 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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