Microsemi Corporation LXM1597-01 Datasheet
P
ATENT PENDING
LIN DOC #:
LXM1597-01
5V CCFL INVERTER MODULES
1597
THE INFINITE POWER OF INNOVATION
DESCRIPTION
LXM1597-01 CCFL (cold cathode florescent
lamp) Inverter Modules are specifically designed for driving LCD back light lamps in
applications where dimmability, ultra-high
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, highvoltage sine waves required to ignite and
operate CCFL lamps. The module design is
based on a proprietary Linfinity IC that provides important new performance advances.
Remarkable improvements in efficiency
and RF emissions result from its single stage
resonant inverter featuring a patent pend-
Current Synchronous, Zero Voltage
ing
Switching (CS-ZVS) topology. CS-ZVS produces nearly pure sine wave currents in the
lamp enabling maximum light delivery while
reducing both conducted and radiated noise.
This topology simultaneously performs
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 components can be used to obtain higher electrical 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 dimming input that permits full range brightness control from an external potentiometer, 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.
three tasks consisting of line voltage regu-
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
BACKLIGHT INVERTER LIGHT OUTPUT EFFICIENCY COMPARISON
50
45
40
35
30
25
20
Eff (Nits / Watts)
15
10
5
0
Not recommended for New Designs
KEY FEATURES
■ 15 to 30% More Light Output
■ Closed Loop, Fully Regulating Design
■ 4.5V To 7V Input Voltage Range
■ Versatile Brightness Control Input
■ 3 MicroAMP Sleep Current
■ Output Short Circuit Protection And
Automatic Over-Voltage Limiting
■ 8mm Max. Height, Narrow Footprints
■ Single Sided PCB Is Self Insulating
APPLICATIONS
■■
■ Notebook And Sub-Notebook Computers
■■
■ Personal Digital Assistants
■ Portable Instrumentation
■ Automotive Displays
■ Desktop Displays
■ Airline Entertainment Centers
BENEFITS
■ Ultra-High Efficiency, Line Voltage
Regulation And Sleep Mode Extend
Computer Battery Life
■ Cool Operation PermitS Close Proximity
To LCD Panel Without Display Distortion
■ Smooth, Full-Range Brightness Control
Gives Your Product A High Quality Image
■ Low EMI / RFI Design Minimizes Shielding
Requirements
■ Narrow, Low-Profile Standard Modules Fit
Into Most LCD Enclosures
■ Single Sided PCB Saves Expensive High
Voltage Insulating Tapes
Linfinity
Copyright © 1998
Rev. 0.6a 10/00
Computer 1
Computer 2
Computer 3
Stock
MODULE ORDER INFO
5V INPUT
LXM1597-01
L INFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
ATENT PENDING
P
PRODUCT DATABOOK 1996/1997
LXM1597-01
5V CCFL INVERTER MODULES
Not Recommended for New Designs
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ............................................................................................................................................................................... -0.3V to 7.0V
Output Voltage, no load ........................................................................................................................................................ Internally Limited to 1900V
Output Current......................................................................................................................................................................... 8.0mA
Output Power .................................................................................................................................................................................................................. 4.2W
Input Signal Voltage, (SLEEP and BRITE Inputs)............................................................................................................................................ -0.3V to 6.5V
Ambient Operating Temperature, zero airflow .................................................................................................................................................. 0°C to 60°C
Storage Temperature Range.............................................................................................................................................................................. -40°C to 85°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of
the specified terminal.
RECOMMENDED OPERATING CONDITIONS (R.C.)
This module has been designed to operate over a wide range of input and output conditions. However, best efficiency and performance
will be obtained if the module is operated under the condition listed in the 'R.C.' column. Min. and Max. columns indicate values beyond
which the inverter, although operational, will not function optimally.
Parameter
Symbol
Input Supply Voltage V
Output Power P
Brightness Control Input Voltage Range V
Lamp Operating Voltage V
Lamp Current - Full Brightness I
Operating Ambient Temperature Range T
IN
O
BRITE
LAMP
OLAMP
A
Recommended Operating Conditions
Min. R.C. Max.
4.5 5 7 V
2.5 4.0 W
0.8 2.5 V
240 500 650 V
57mA
060°C
(Internally Limited)
RMS
RMS
Units
RMS
RMS
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1597.
Parameter
Symbol
Test Conditions Units
LXM1597
Min. Typ. Max.
Output Pin Characteristics
Full Bright Lamp Current I
Minimum Lamp Current I
Lamp Start Voltage V
Operating Frequency f
L (MAX)VBRITE
L (MIN)VBRITE
LS
O
= 2.5 VDC, SLEEP = Logic High
= 0.8 VDC, SLEEP = Logic High
0°C < TA < 60°C
V
= 2.5VDC, SLEEP = Logic High, VIN = 5V
BRITE
6.2 6.6 7.0 mA
2.6 mA
1300 V
50 KHz
RMS
RMS
Brightness Control
Input Current I
BRITEVBRITE
Input Voltage for Max. Lamp Current VCI
Input Voltage for 50% Lamp Current V
CIO (LAMP)
= 0V
O (LAMP)
DC
= 100%
= 50%
-200 -1000 nA
2.4 2.5 2.6 V
1.25 V
DC
DC
DC
SLEEP Input
Input Logic 1 V
Input Logc 0 V
Input Current I
IH
IL
V
IN
= 0 - 5V
SLEEP
DC
2.2 5.5 V
0 0.8 V
50 100 µA
DC
DC
DC
Voltage Reference
Output Voltage V
Output Current I
0 < I
REF
REF
< 500µA
REF
2.40 2.50 2.60 V
500 µA
DC
DC
Power Characteristics
Sleep Current I
IN (MIN)VIN
Electrical Efficiency (calculated values) η LXM1597, V
= 5VDC , SLEEP = Logic 0
= 5VDC, I
IN
O (LAMP)
= 5mA
RMS
310µA
DC
90 %
2
Copyright © 1998
Rev. 0.6a 10/00
Loading...