Microsemi Corporation LXM1610-01 Datasheet
P ATENTS PENDING
LIN DOC #: 1610
LXM1610-01
D IRECT DRIVE CCFL INVERTER MODULE
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION KEY FEATURES
Single Output Inverter Ideal For Portable Applications. The LXM1610 se-
ries of Direct Drive
TM
CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules
are specifically designed for driving LCD
backlight lamps. They excel in applications where critical parameters include
dimmability, high efficiency and reliable
fail-safe design in a small form factor.
These inverters are recommended for use
in panels with low-voltage insulation on
the lamp return wire.
Wide Input Voltage Range. The
modules convert unregulated DC voltage from the system battery or AC adapter
directly to high-frequency, high-voltage
waves required to ignite and operate
CCFL lamps. Input voltage can range
from 8 to 18 volts.
Direct Drive Technology. The module design is based on a new Direct Drive
topology, which provides a number of
cost and performance advantages. The
LXM1610-01 series Direct Drive invert-
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
ers eliminate the classic resonant inductor and capacitors, thus reducing cost and
allowing a 30% reduction in module size.
Fixed-Frequency Operation. Other
benefits of this new topology are fixedfrequency operation and secondary-side
strike-voltage regulation. Strike-voltage
regulation minimizes corona discharge in
the output transformer and related circuitry, providing longer life and higher
reliability.
Dimming Features. The LXM1610
modules are equipped with a dimming
input that permits brightness control from
an external potentiometer or DC voltage.
In addition, the sleep input reduces module power to a few microwatts in shut
down mode. All LXM1610 modules feature both output open and short-circuit
protection. The LXM1610 is fully
customizable (electronically and mechanically) to specific customer requirements.
P RELIMINARY DATA SHEET
■ 8V to 18V Input Voltage Range
■ 30% Smaller Than CS-ZVS Models
■ Versatile Brightness Control Input
■ MicroAmp SLEEP Mode
■ Open And Shorted Lamp Protection
■ 8.3mm Max. Module Height, 16mm Width
■ Fixed Frequency Operation
APPLICATIONS
■ Notebook And Sub-Notebook Computers
■ Portable Instrumentation
■ Automotive Displays
■ Desktop Displays
■ Airline Entertainment Centers
BENEFITS
■
High Efficiency, Line Voltage Regulation And
Sleep Mode Extend Computer Battery Life
■ Smooth, Wide-Range Brightness Control
Gives Your Product A High Quality Image
■ Output Voltage Regulation Minimizes
Corona Discharge For Long Life And High
Reliability
V
SLEEP
BRITE
GND
PRODUCT HIGHLIGHT
DIRECT DRIVE OUTPUT ARCHITECTURE
IN
I
SNS
V
SNS
MODULE ORDER INFORMATION
Direct Drive architecture includes two load feedback
control loops to provide uncompromised CCFL ignition
and operation characteristics.
Lamp current is regulated in the CCFL return lead (I
loop) to insure constant light output with changing lamp
parameters and power supply voltage. This also allows
accurate and repeatable brightness control. Dimming ratio
CCFL
with the LX1610 analog dimming inverters is typically 5:1
when driving 12.1 to 15 inch LCD panels.
If no current flows in the CCFL return path because of
an unstruck or failed lamp, the inverter applies full strike
voltage potential. The output voltage feedback loop (V
takes control and regulates output voltage to 1650V
This insures the lamp will ignite under worst case temperature and aging conditions.
Because output voltage is actively regulated, it will
never exceed component and panel insulation ratings.
This prevents destructive corona discharge to insure long
term reliability of the system.
SNS
RMS
SNS
)
.
Copyright © 1999
Rev. 0.4 8/99
LXM1610-01
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
P ATENT PENDING
PRODUCT DATABOOK 1996/1997
LXM1610-01
D IRECT DRIVE CCFL INVERTER MODULE
P RELIMINARY DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN)........................................................................................................................................................-0.3V to 18V
Output Voltage, no load .............................................................................................................................. Internally Limited to 1800V
Output Current............................................................................................................................................. 10.0mA
Output Power ........................................................................................................................................................................................ 6.0W
Input Signal Voltage, (SLEEP and BRITE Inputs) ..................................................................................................................... -0.3V to V
Ambient Operating Temperature .............................................................................................................................................. 0°C to 70°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 Range (Functional) V
Input Supply Voltage (Fully Regulated Lamp Current) 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
IN
O
BRT ADJ
LAMP
OLAMP
A
Recommended Operating Conditions
Min. R.C. Max.
81218V
91216V
45W
0.0 2.5 V
300 675 800 V
7.0 mA
070°C
(Internally Limited)
RMS
RMS
IN
Units
RMS
RMS
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1610.
Parameter
Symbol
Test Conditions Units
LXM1610-01
Min. Typ. Max.
Output Pin Characteristics
Full Bright Lamp Current I
Minimum Lamp Current (Note 2) I
Lamp Start Voltage V
Operating Frequency f
L (MAX)VBRT ADJ
L (MIN)VBRT ADJ
LS
O
= 2.5VDC, SLEEP = HIGH, VIN = 9V
= 0VDC, SLEEP = HIGH, VIN = 9V
0°C < TA < 40°C
V
= 2.5VDC, SLEEP = HIGH, VIN = 12V
BRT ADJ
DC
DC
6.3 7.0 7.7 mA
2.0 2.5 3.0 mA
1500 1800 V
DC
52 57 62 KHz
BRITE Input
Input Current I
BRTVBRT ADJ
Input Voltage for Max. Lamp Current VCI
Input Voltage for Min. Lamp Current VCI
O (LAMP)
O (LAMP)
= 0V
DC
= 100%
= Minimum
-62 µA
2.5 V
0V
SLEEP Input
RUN Mode V
SLEEP Mode V
Input Current I
SLEEP (HI)
SLEEP (LO)
SLEEP
SLEEP = 5.0V
2.2 V
IN
-0.3 0.8 V
120 180 µA
Power Characteristics
Sleep Current I
V
Ouput
REF
V
Output Voltage V
REF
V
Source Impedance R
REF
IN (MIN)VIN
REFRL
REF
Note 2. Minimum lamp current required to maintain even light output may vary with display panel.
= 15V
≥ 1MΩ
, SLEEP ≤ 0.8V 10 50 µA
DC
4.9 5.1 5.3 V
10 Ω
RMS
RMS
RMS
DC
DC
DC
V
DC
DC
DC
DC
DC
2
Copyright © 1999
Rev. 0.4 8/99
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