LXM1640-01 [MICROSEMI]
DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE; DIRECT DRIVE QUAD灯CCFL逆变器模块
| 型号： | LXM1640-01 |
| 厂家： | 
Microsemi |
| 描述： | DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE |
| 文件： | 总5页 (文件大小：186K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
P A T E N T S P E N D I N G
LIN D O C #: 1640
LXM1640-01
DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE
P R E L I M I N A R Y D A T A S H E E T
T H E I N F I N I T E P O W E R O F I N N O V A T I O N
DESCRIPTION
KEY FEATURES
■ Drive Four Lamps With One Module
■ Small, Compact Size
The Quad Output Module Ideal for
Desktop and Industrial Applications.
The LXM1640 Direct DriveTM Cold Cathode
Fluorescent Lamp (CCFL) Inverter is a single
module designed to drive four lamps and
is targeted for use with desktop Liquid Crys-
tal Display (LCD) and industrial LCD pan-
els typically ranging in size from 14-inches
to 21-inches. This four output inverter is
the ideal solution to power virtually any
four lamp application.
Direct Drive Technology. The mod-
ule design is based on a new Direct Drive
topology, which provides a number of cost
and performance advantages. The
LXM1640-01 Direct Drive inverters eliminate
the classic resonant inductor and capaci-
tors, thus reducing cost and allowing a sub-
stantial reduction in module size.
Fixed-Frequency Operation. Other
benefits of this new topology are fixed-fre-
quency 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.
Fail-safe Feature For Multiple Lamp
Applications. Our multi-output inverters
are designed to keep your application op-
erating at near normal brightness in the
event that a lamp fails. This allows the
display to remain "on-line" until lamp re-
placement is convenient.
■ High Efficiency
■ Multiple Output Connectors Provide Easy
Quad Module Uses Standard Power
Supply. The LXM1640 module uses a stan-
dard 12V input supply. It also ensures
nominal power consumption with 4 lamps
requiring only 16 watts. Lamp current is
fully regulated with respect to input volt-
age and output impedance variations.
Dimming Features. The LXM1640 mod-
ules 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 LXM1640 modules feature both
output open and short-circuit protection.
The Most Efficient and Cost-effective
Backlight Inverter for Desktop/Indus-
trial Applications. Linfinity's proprietary
Direct Drive architecture is the highest ef-
ficiency, small form factor solution for all
multiple lamp applications. The LXM1640
is fully customizable (electronically and me-
chanically) to specific customer require-
ments.
LCD Connections
■ Low EMI And Noise
■ Low Power Sleep Mode
■ Output Short And Open Circuit Protection
■ 3:1 Dimming Control
■ Adjustable Lamp Current Up To 6.0mA Per
Lamp
■ Long Lamp Life With Soft-Start And
Accurate Lamp Current Regulation
APPLICATIONS
■ Desktop LCD Monitors And Panels
■ Industrial LCD Panels
■ Hi-Brite Displays
BENEFITS
■ Cool Operation
■ Smooth, Easy-To-Use Brightness Control
■ Single 12 Volt Supply
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
LXM1640 "UNIVERSAL" MODULE CONNECTION OPTIONS
Quad Connector Configuration
Dual Connector Configuration
CCFL Lamps
CCFL Lamps
Desktop Display
Desktop Display
MODULE ORDER INFORMATION
LXM1640-01
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
Copyright © 1998
Rev. 0.4 5/98
1
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LXM1640-01
DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE
P R E L I M I N A R Y D A T A S H E E T
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN)....................................................................................................................................................... -0.3V to 16V
Output Voltage, no load ..............................................................................................................................Internally Limited to 1800VRMS
Output Current (per Lamp) ........................................................................................................................ 10.0mARMS (Internally Limited)
Output Power (per Lamp) .................................................................................................................................................................... 6.0W
Input Signal Voltage, (SLEEP and BRITE Inputs)..................................................................................................................... -0.3V to VIN
Ambient Operating Temperature, zero airflow ........................................................................................................................0°C to 40°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.
Recommended Operating Conditions
Parameter
Symbol
Units
Min.
R.C.
Max.
Input Supply Voltage Range (Functional)
Output Power (per Lamp)
VIN
PO
10.8
12
4
13.2
5
V
W
Brightness Control Input Voltage Range
Lamp Operating Voltage
Lamp Current (Full Brightness - per Lamp)
Operating Ambient Temperature Range
VBRT ADJ
VLAMP
IOLAMP
TA
0.0
5.0
800
V
300
675
6.0
VRMS
mARMS
°C
0
40
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1640.
LXM1640-01
Parameter
Symbol
Test Conditions
Units
Min. Typ.
Max.
Output Pin Characteristics
Full Bright Lamp Current (per Lamp)
Minimum Lamp Current (per Lamp)
(Note 2)
IL (MAX)
IL (MIN)
VBRT ADJ = 5.0VDC, SLEEP = HIGH, VIN = 12VDC
VBRT ADJ = 0VDC, SLEEP = HIGH, VIN = 12VDC
5.4
6.0
0.5
6.6
mARMS
mARMS
1500
52
1800
62
VRMS
Lamp Start Voltage
Operating Frequency
VLS
fO
0°C < TA < 40°C, VIN ≥ 10.8VDC
VBRT ADJ = 5.0VDC, SLEEP = HIGH, VIN = 12VDC
57
KHz
BRITE Input
Input Current
IBRT
VC
VBRT ADJ = 0VDC
27
30
5.0
0
33
µADC
VDC
VDC
Input Voltage for Max. Lamp Current
Input Voltage for Min. Lamp Current
IO (LAMP) = 100%
IO (LAMP) = Minimum
VC
SLEEP Input
RUN Mode
SLEEP Mode
Input Current
VSLEEP (HI)
VSLEEP (LO)
ISLEEP
2.2
-0.3
90
VIN
0.8
150
VDC
VDC
SLEEP = 5.0V
110
10
µADC
Power Characteristics
Sleep Current
IIN (MIN)
VIN = 12VDC , SLEEP = 0VDC
0
500
µADC
Note 2. Minimum lamp current required to maintain even light output may vary with display panel.
Copyright © 1998
Rev. 0.4 5/98
2
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LXM1640-01
DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE
P R E L I M I N A R Y D A T A S H E E T
FUNCTIONAL PIN DESCRIPTION
Conn.
CN1
Pin
Description
CN1-1
CN1-2
VIN
Input Power Supply. (10.8V ≤ VIN ≤ 13.2V)
CN1-3
CN1-4
GND
Power Supply Return.
CN1-5
CN1-6
CN1-7
CN1-8
SLEEP
BRITE
N.C.
N.C.
ON/OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF)
Brightness Control (-0.3V to 5.0VDC). 5.0VDC gives maximum lamp current.
No Connect.
No Connect.
CN2 and CN3: Refer to Figure 1
PHYSICAL DIMENSIONS
LXM1640-01
All dimensions are in inches (mm)
6.89 (175)
6.73 (171)
0.016
(4)
0.016 (4)
Ø 0.118 (3.0) Mtg. Hole, 2 Places
CN3
CN2
0.94
(24)
0.33 (8.5)
CN1
CN7
CN6
CN5
CN4
0.32 (8.25)
0.06 (1.52)
0.46 (11.8)
Copyright © 1998
Rev. 0.4 5/98
3
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LXM1640-01
DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE
P R E L I M I N A R Y D A T A S H E E T
CONNECTOR SCHEMATIC
CN4
2
CN5
CN1
CN6
CN7
2
3
1
2
1
2
1
3
1
8
1
N.C.
3
N.C.
3
VHI1
VHI2
VHI3
VHI4
Inverter
Output 1
Inverter
Output 2
Inverter
Output 3
Inverter
Output 4
1
2
4
1
2
4
CN2
CN3
FIGURE 1 — LXM1640-01 Connector Schematic
Connectors:
CN1 = MOLEX 53261-0890
Mates With:
Pins: 50079-8100*, Housing: 51021-0800
* Loose (-8000, Chain) Recommended #26 AWG wiring
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
JST BHR-04VS-1
JST BHR-03VS-1
JST BHR-03VS-1
Connection Rules
1. Always install four (4) lamps. Operating with out all lamps may overdrive lamp current at maximum brightness settings.
2. Verifylampwiringbeforeconnectinglampstotheinvertermodule. Connectingmorethanonelamptooneofthefourinverteroutput
circuits will result in reduced brightness. The LXM1640-01 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.
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.
Thisallowsthedisplaytoremain"on-line"untillampreplacement
is convenient.
Linfinity "pairs" the lamps so that if one lamp in the pair breaks,
most of its current is added to the good lamp. CCFLs will respond
with more brightness for a period of time. Operating time in this
Lamps
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 thatall lamps in a display be replaced at the same
time.
IS
FIGURE 2 — Quad Output Stage
Copyright © 1998
Rev. 0.4 5/98
4
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LXM1640-01
DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE
P R E L I M I N A R Y D A T A S H E E T
DIRECT DRIVE OUTPUT ARCHITECTURE
Direct Drive architecture includes two load feedback control loops
to provide uncompromised CCFL ignition and operation character-
istics.
Lamp current is regulated in the CCFL return lead (ISNS loop) to
insure constant light output with changing lamp parameters and
power supply voltage. This also allows accurate and repeatable
brightnesscontrol. DimmingratiowiththeLX1640analogdimming
inverters is typically 6:1 when driving quad LCD lamp 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 (VSNS) takes control
and regulates output voltage to 1650VRMS. This insures lamps will
ignite under worst case temperature and aging conditions.
Becauseoutputvoltageisactivelyregulated,itwillneverexceed
component and panel insulation ratings. This prevents destructive
corona discharge to insure long term reliability of the system.
High Voltage
Transformer
VHI1
SLEEP
Transformer
Driver
BRITE
GND
Controller
VSENSE
ISENSE
VLO
FIGURE 3 — LXM1640 Block Diagram
(Only one lamp shown)
TYPICAL APPLICATIONS
10.8VDC- 13.2VDC
5.0VDC
VHI4
VHI3
VHI2
VHI1
VIN
≤10k
BRITE
SLEEP
LXM1640-01
5V
0V
GND
VLO
FIGURE 4 — Potentiometer Brightness Control
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.
Copyright © 1998
Rev. 0.4 5/98
5
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