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PDF LXM1641-02 Data sheet ( Hoja de datos )
| Número de pieza | LXM1641-02 | |
| Descripción | DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE | |
| Fabricantes | Microsemi Corporation | |
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RangeMAXTM LXM1641-01/-02/-03
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
DIGITAL DIMMING QUAD LAMP CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
DESCRIPTION
RangeMAX Wide Range Dimming, Quad
Output Inverter. The LXM1641 Direct
DriveTM CCFL (Cold Cathode Fluorescent
Lamp) Inverter Modules are specifically de-
signed for driving LCD backlight lamps.
Similar to the LXM1640, the LXM1641 ex-
cels in applications where critical parameters
include very wide range dimmability, high ef-
ficiency and reliable fail-safe design in a small
form factor. These 12 volt input modules are
specifically designed with desktop and indus-
trial applications in mind.
Unlike the LXM1640 or any traditional
dimming CCFL inverters, the LXM1641 pro-
vides the designer a vastly superior display
brightness range. 1000:1+ brightness range
is achievable with a standard LCD display (see
Application Section). Our wide range dim-
ming provides exceptional display readability
at less than 1% of full brightness, allowing
both power savings and low ambient light op-
erating capability (i.e. "night readable").
RangeMAX Digital Dimming Tech-
nique. Digital dimming provides flicker-free
brightness control in any wide-range dimming
application. Dimming ratios greater than
1000:1 can be achieved. Incorporation of a
video synchronization feature allows wide
ratio dimming without the display distur-
bances and interference seen with competi-
tive products.
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).
Failsafe Feature For Multiple Lamp Ap-
plications. Our multi-output inverters are
designed to keep your application operating
at near normal brightness in the event that a
lamp fails. This allows the display to remain
"on-line" until lamp replacement is conve-
nient.
Direct Drive Technology. The module
design is based on a new patented1 Direct
Drive topology, which provides a number of
cost and performance advantages. The
LXM1641-xx Direct Drive inverters eliminate
the classic resonant inductor and capacitors,
thus reducing cost and allowing a substantial
reduction in module size.
Universal Connector Configuration.
Linfinity's multiple lamp inverters include a
built in connector array for the most com-
mon LCD lamp configurations.
Additional Features. Other benefits of
this new topology are fixed-frequency opera-
tion and secondary-side strike-voltage regu-
lation.
Strike-voltage regulation minimizes corona
discharge in the output transformer and re-
lated circuitry, providing longer life and higher
reliability. All LXM1641 modules feature
both open and shorted lamp protection.
The LXM1641 is fully customizable (elec-
tronically and mechanically) to specific cus-
tomer requirements.
1 US Patent Numbers: 5923129 & 5930121
KEY FEATURES
s RangeMAX Wide Range Dimming
s 8V to 16V Input Voltage Range
s Small Form Factor
s Easy To Use Brightness Control
s MicroAmp SLEEP Mode
s Output Short-Circuit Protection And
Automatic Strike-Voltage Regulation
s Fixed Frequency Operation
s Universal Connector Configuration
A P P L I C AT I O N S
s Hi-Brite Displays
s Desktop Displays
s Low Ambient Light Conditions (i.e. Aircraft
Cabins, Automobile)
s Industrial Applications
BENEFITS
s High Efficiency Reduces Heating Problems
s Smooth, Flicker Free 0-100% Full-Range
Brightness Control Gives Your Product A
High Quality Image
s Output Open Circuit Voltage Regulation
Minimizes Corona Discharge For Long Life
And High Reliability
s Power Efficient, "Low Brightness" Capability
Allows For Advanced Power Management
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
MODULE ORDER INFORMATION
Part Number
Application
Inverter Mates Directly
to Panel Connectors
LXM1641-01
Quad Lamp Panels
JST BHR-03VS-1 (3-pin) &
JST BHR-04VS-1 (4-pin)
LXM1641-02
Sharp 18.1" Panel
JST XHP-9 (9-pin)
LXM1641-03 LG Electronics 18.1" Panel
JST BHSR-02VS-1 (2-pin)
Copyright © 1999
Rev. 0.7 12/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
1 page  
RangeMAXTM
PRODUCT DATABOOK 1996/1997
LXM1641-01/-02/-03
DIGITAL DIMMING QUAD LAMP CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
CONNECTOR SCHEMATIC
Inverter VHI2
Output 2
CN1
81
VHI4 Inverter
Output 4
Inverter VHI1
Output 1
4
3
2
1
CN2
N.C.
1
2
3
CN4
1
2
CN5
2
1
CN6
3
2
1
CN7
VHI3 Inverter
Output 3
1
2
N.C. 3
4
CN3
FIGURE 2 — LXM1641-01 Connector Schematic
Note: CN2 and CN3 (shown with dashed lines) are located on the opposite side of the PCB from CN1, CN4,
CN5, CN6, and CN7. Their pin numbers are shown as viewed looking through the printed circuit board.
Connectors:
CN1 = MOLEX 53261-0890
CN2, CN3 = JST SM04(4.0)B-BHS-1-TB
CN4, CN7 = JST SM03(4.0)B-BHS-1-TB
CN5, CN6 = JST SM02(8.0)B-BHS-1-TB
Mates With:
Pins: 50079-8100*, Housing: 51021-0800
* Loose (-8000, Chain) Recommended #26 AWG wiring
JST BHR-04VS-1
JST BHR-03VS-1
JST BHR-03VS-1
Connection Rules
1. Always install FOUR (4) lamps. Operating with fewer lamps may overdrive lamp current at maximum brightness settings.
2. Verify lamp wiring before connecting lamps to the inverter module. Connecting multiple lamps to one of the four inverter output
circuits will result in reduced brightness. The LXM1641-01 module connectors are wired per industry standard. The lamp hot wires
(high voltage wires) are always on pin 1 or 2, and the cold wire (low voltage wire) is always on pin 3 or 4.
Copyright © 1999
Rev. 0.7 12/99
5
5 Page 
RangeMAXTM
PRODUCT DATABOOK 1996/1997
LXM1641-01/-02/-03
DIGITAL DIMMING QUAD LAMP CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
1000:1 DIMMING APPLICATION
The following application defines techniques capable of deliver-
ing dimming ranges in the 250:1 and 1000:1 range. As is widely
understood, these techniques will provide general capabilities and actual
system performance will vary with panel design, CCFTs, ambient tem-
perature and a number of other variables outside the control of the
inverter. These methods can be used in conjunction with other tech-
niques such as lamp heating and matching.
Wide ratio (1000:1) dimming can be accomplished using the Linfinity
inverter in two ways:
1) By varying the input voltage on the brightness pin as
indicated in Figure 12. Caution must be exercised when
applying negative voltage to the brightness control input.
Applying more than -300mV to any inverter input will cause
inverter malfunction (see Absolute Maximum Ratings).
2) By making a resistor value change on the module. If this
option is preferrable, please contact the factory for applica-
tion assistance.
Both methods discussed will provide a lower duty cycle
operation than is necessary in a 100:1 dimming application.
Careful consideration should be made with regards to display quality
7
0.7
.14
.070
-100mV
0V
V (V)
BRT ADJ
2.5V
FIGURE 12 — Average Lamp Current vs. V Voltage
BRITE
(per Lamp)
at these dimming levels. At very low brightness levels, even very small
amounts of noise on the VBRITE line can cause flicker on the display, so
special care must be given to grounding, filtering and shielding the
inverter from the digital logic and clock.
FAILSAFE FEATURE FOR MULTIPLE LAMP OPERATIONS
Our multi-output inverters are designed to keep your application
operating at near normal brightness in the event that a lamp fails.
This allows the display to remain "on-line" until lamp replacement
is convenient.
Linfinity "parallels" the lamps so that if any lamps break, most
of the current is added to the remaining good lamps. CCFLs will
respond with more brightness for a period of time. Operating time
in this mode will be a function of the lamps age but should be
typically in the order of hundreds of hours.
This operating characteristic can provide adequate display
performance for a limited, but useful period of time. Shortening
of the lamp life in this mode is typically not a concern as it is
recommended that all lamps in a display be replaced at the same
time.
RangeMAX INVERTERS
IS
Lamps
Also available in Single
Output LXM1611-01,
LXM1612-xx-xx and Dual
OutputLXM1621-xx versions
for multiple lamp applications.
FIGURE 13 — Quad Output Stage
Copyright © 1999
Rev. 0.7 12/99
RangeMAX and Direct Drive are trademarks of Linfinity Microelectronics Inc.
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may
not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form
only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
11
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LXM1641-02.PDF ] | |
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