Microsemi Corporation LXM1611-01 Datasheet
P ATENTS PENDING
)
LIN DOC #: 1611
RangeMAX
D IGITAL DIMMING CCFL INVERTER MODULE
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION KEY FEATURES
RangeMAX Wide Range Dimming, Single
Output Inverter. The LXM1611 series of
Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically
designed for driving LCD backlight lamps.
Similar to the LXM1610, the LXM1611 excels in applications where critical parameters
include very wide range dimmability, high
efficiency and reliable fail-safe design in a
small form factor.
Unlike the LXM1610 or any traditional
dimming CCFL inverters, the LXM1611 provides the designer a vastly superior display
brightness range. 100:1+ brightness range
is achievable with virtually any LCD display.
Our wide range dimming provides exceptional display readability at less than 1% of
full brightness, allowing both power savings
and low ambient light operating capability
(i.e. "night readable").
The LXM1611 is recommended for use in
panels with low-voltage insulation on the
lamp return wire.
RangeMAX Digital Dimming Technique. Digital dimming provides flicker-
free brightness control in any wide-range
dimming application. Dimming ratios greater
than 100:1 can be achieved. Incorporation
of a video synchronization feature allows
wide ratio dimming without the display disturbances and interference seen with competitive products.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
The modules are equipped with a dimming
input that permits brightness control from an
external potentiometer or DC voltage source.
The resultant "burst drive" that energizes the
lamp was designed specifically to ensure that
no premature lamp degradation occurs. (See
"How RangeMAX Works" Section)
Wide Input Voltage Range. The modules convert unregulated DC voltage from the
system battery or AC adapter directly to highfrequency, high-voltage waves required to
ignite and operate CCFL lamps.
Direct Drive Technology. The module
design is based on a new Direct Drive topology, which provides a number of cost and
performance advantages. The LXM1611-01
series Direct Drive inverters eliminate the classic resonant inductor and capacitors, thus
reducing cost and allowing a 30% reduction
in module size.
Additional Features. Other benefits of
this new topology are fixed-frequency 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. All LXM1611 modules feature both
open and shorted lamp protection.
The LXM1611 is fully customizable (electronically and mechanically) to specific customer requirements.
TM
LXM1611-01
P RELIMINARY DATA SHEET
■ RangeMAX Wide Range Dimming
■ 8V to 18V Input Voltage Range
■ 30% Smaller Than CS-ZVS Models
■ Easy To Use Brightness Control
■ MicroAmp SLEEP Mode
■ Output Short-Circuit Protection And
Automatic Strike-Voltage Regulation
■ 7.3mm Max. Module Height, 16mm Module
Width
■ Fixed Frequency Operation
APPLICATIONS
■ Notebook And Sub-Notebook Computers
■ Portable Instrumentation
■ Desktop Displays
■ Low Ambient Light Conditions (i.e. Aircraft
Cabins, Automobile)
BENEFITS
■ High Efficiency And Sleep Mode Feature
Extends Computer Battery Life
■ Smooth, Flicker Free 1-100% Full-Range
Brightness Control Gives Your Product A
High Quality Image
■ Output Open Circuit Voltage Regulation
Minimizes Corona Discharge For Long Life
And High Reliability
■ Power Efficient, "Low Brightness" Capability
Allows For Advanced Power Management
Power Used (Watts)
Copyright © 1999
Rev. 0.4 8/99
RANGEMAX VS. ANALOG DIMMING
5
4
3
2
1
0
30 45
Standard Analog
Dimming Inverter
60
75 90 105
Light Output (Nits
LinFinity's
RangeMAX
MODULE ORDER INFORMATION
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
PRODUCT HIGHLIGHT
■ RangeMAX technology allows the designer to operate
in a lower "brightness" and therefore at lower "power
consumption" than can be reached using traditional
analog dimming inverters.
■ Dotted line indicates area where panel variations and
parasitics will impact minimum light level with analog
dimming.
■ Data presented for a RangeMAX inverter driving a
13.3" LCD with a 1.2 Nit to 120 Nit brightness range.
The minimum power levels were 0.4 watts
(RangeMAX) vs. 2.1 watts (analog dimming) for a
power consumption savings of 1.7 watts.
LXM1611-01
1
P ATENT PENDING
PRODUCT DATABOOK 1996/1997
LXM1611-01
RangeMAX
D IGITAL DIMMING 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 (BRITE Input) ....................................................................................................................................... -0.3V to 6.5V
Input Signal Voltage (SLEEP, V
Ambient Operating Temperature ..............................................................................................................................................0°C to 70°C
SYNC(-)
, V
Inputs) ............................................................................................................... -0.3V to V
SYNC(+)
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)
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
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
TM
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 LXM1611.
Parameter
Symbol
Test Conditions Units
LXM1611-01
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, Burst Duty = 100%, VIN = 9V
= 0VDC, SLEEP = HIGH, Burst Duty = 2%, VIN = 9V
0°C < TA < 40°C, V
V
= 2.5VDC, SLEEP = HIGH, VIN = 12V
BRT ADJ
≥ 7.0V
IN
DC
DC
6.3 7.0 7.7 mA
DC
DC
0.14 mA
1500 1800 V
52 57 62 KHz
BRITE Input
Input Current I
Input Voltage for Max. Lamp Current V
Input Voltage for Min. Lamp Current V
V
BRT
C
C
= 0V
BRT ADJ
I
O (LAMP)
I
O (LAMP)
DC
= 100% Duty Cycle
= Minimum Duty Cycle
-10 -12 -14 µA
2.5 2.6 V
00V
SLEEP Input
RUN Mode V
SLEEP Mode V
SLEEP (HI)
SLEEP (LO)
Input Current I
V
/ V
SYNC(-)
Logic High Level V
Logic Low Level V
Characteristics
SYNC(+)
SYNCH (HI)
SYNCH (LO)
Input Impedance Z
Pulse Width (Note 3) t
Input Frequency f
SLEEP
IN
PW
SYNC
SLEEP = 5.0V
2.2 V
IN
-0.3 0.8 V
120 180 µA
4.0 6.5 V
-0.3 1.0 V
60 66 75 kΩ
25 250 µs
49 150 Hz
Power Characteristics
Sleep Current I
IN (MIN)VIN
Note 2. Minimum lamp current required to maintain even light output may vary with display panel.
3. The module will be functional with pulse widths much larger than 250µs, but will have limited dimming.
= 15V
, SLEEP ≤ 0.8V
DC
10 50 µA
RMS
RMS
RMS
DC
DC
DC
V
DC
DC
DC
DC
DC
DC
2
Copyright © 1999
Rev. 0.4 8/99
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