LXM1643-12-63 (Microsemi Corporation)
12V Quad 6W CCFL Programmable Inverter Module

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PanelMatch™
LXM1643-12-63
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
The LXM1643-12-63 is a Quad 6W The resultant “burst drive” that
Output Direct Drive™ CCFL (Cold energizes the lamp was designed
Cathode Fluorescent Lamp) Inverter specifically to ensure that no premature
Module specifically designed for driving lamp degradation occurs, while allowing
LCD backlight lamps. It is ideal for significant power savings at lower dim
driving the 15” Optrex T-51511D150-FW- levels.
A-AC/AD, T51863D150J-FW-A-AB/AD, The modules convert the DC voltage
or similar TFT LCD panels.
from the system battery or AC adapter
LXM1643 modules provide the directly to high frequency, high-voltage
designer with a vastly superior display waves required to ignite and operate
brightness range than typical with analog CCFL lamps.
(current amplitude control) dimming.
The LXM1643-12-63 inverter is
The inverter includes a dimming input intended for panel assemblies with two
that permits brightness control from either high and two low lamp connections, each
a DC voltage source or a PWM signal or sharing the same connector. Two other
external potentiometer. The maximum versions, the LXM1643-12-61 and the
output current is externally programmable LXM1643-12-62, are available to match
over a range of 5 to 8mA in 1mA steps to other quad lamp panels with alternative
allow the inverter to match properly to a output connector configurations.
wide array of LCD panel lamp current Other benefits of this new topology
specifications.
are stable fixed-frequency operation,
The RangeMAX™ Digital Dimming secondary-side strike-voltage regulation,
Technique provides flicker-free brightness and both open/shorted lamp protection
control in any wide range (typically 50:1+) with fault timeout.
dimming application.
KEY FEATURES
ƒ Externally Programmable
Maximum Output Current
ƒ Easy to Use Brightness
Control
ƒ RangeMAX Wide Range
Dimming
ƒ Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation and Timeout
ƒ Fixed Frequency Operation
ƒ Rated From -20 to 70°C
ƒ
APPLICATIONS
ƒ High Brightness Displays
ƒ Desktop Displays
ƒ Industrial Display Controls
BENEFITS
ƒ Smooth, Flicker Free 2%-
100% Full-Range Brightness
Control
ƒ Programmable Output
Current Allows Inverter to
Mate With a Wide Variety of
LCD Panel Specifications
ƒ
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected By U.S. Patents: 5,923,129; 5,930,121; 6,298,234; Patents Pending
PRODUCT HIGHLIGHT
DC Voltage
Source
Potentiometer
PWM
Signal
Universal Dimming Input
PWM, VDC, or
Potentiometer
Microsemi
PART NUMBER
LXM1643-12-63
PACKAGE ORDER INFO
OUTPUT CONNECTORS
Two JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00
and Two JST SM02(4.0)B-BHS-1-TB or equivalent connectors
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
JST BHSR-02VS-1 and
JST BHR-02VS-1
Copyright © 2004
Rev. 1.0, 2005-03-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1


LXM1643-12-63 (Microsemi Corporation)
12V Quad 6W CCFL Programmable Inverter Module

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PanelMatch™
LXM1643-12-63
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Input Signal Voltage (VIN1).....................................................................................................................................-0.3V to 15V
Input Power ....................................................................................................................................................................... 30W
Output Voltage, no load ............................................................................................................ Internally Limited to 2000VRMS
Output Current (each output) ......................................................................................................9.5mARMS (Internally Limited)
Output Power (each output) ............................................................................................................................................. 6.0W
Input Signal Voltage ( SLEEP Input) ..................................................................................................................... -0.3V to VIN1
Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V
Ambient Operating Temperature, zero airflow.....................................................................................................-20°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 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
Recommended Operating Conditions
Min R.C. Max
Input Supply Voltage Range (Fully Regulated
Lamp Current)
VIN1
10.8
12
13.2
Input Supply Voltage Range (Functional)
10.2 12 13.8
Output Power (each output)
PO 5.0 6.0*
Linear BRITE Control Input Voltage Range
VBRT_ADJ
0.5
2.0
Lamp Operating Voltage
VLAMP
530
625
730
Lamp Current (Full Brightness)
IOLAMP
5
8
Operating Ambient Temperature Range
TA -20
70
*Total output power must not exceed 6W . Higher voltage lamps may require maximum output current to be set lower than 8mARMS
Units
V
W
V
VRMS
mARMS
°C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
Parameter
Symbol
Test Conditions
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current (each output)
Full Bright Lamp Current (each output)
Full Bright Lamp Current (each output)
Full Bright Lamp Current (each output)
Output Current Lamp to Lamp
Deviation
Min. Average Lamp Current
(each output)
Lamp Start Voltage
Operating Frequency
Burst Frequency
IL(MAX)
IL(MAX)
IL(MAX)
IL(MAX)
ILL%DEV
IL(MIN)
VLS
fO
fBURST
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Ground, ISET2 = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Ground, ISET2 = Open
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Open
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Open
VBRT_ADJ 0.5VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = ISET2 = Ground
-20°C < TA < 70°C, VIN1 > 10.8VDC
VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 12V
Output Burst Frequency
LXM1643-12-63
Units
Min Typ Max
4.0 5
5.0 6
6.0 7
7.0 8
3
1500
69
269
.30
1650
72
281
5.5 mARMS
6.6 mARMS
7.7 mARMS
8.8 mARMS
10 %
mARMS
VRMS
75 kHz
293 Hz
Copyright © 2004
Rev. 1.0, 2005-03-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2


LXM1643-12-63 (Microsemi Corporation)
12V Quad 6W CCFL Programmable Inverter Module

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PanelMatch™
LXM1643-12-63
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
Parameter
Symbol
Test Conditions
` BRITE INPUT
Input Current
Minimum Input for Max. Lamp Current
Maximum Input for Min. Lamp Current
` SLEEP INPUT
RUN Mode
SLEEP Mode
` SET1,2 INPUT
SET1,2 Low Threshold
Input Current
` POWER CHARACTERISTICS
Sleep Current
Run Current
Efficiency
IBRT
VBRT_ADJ
VBRT_ADJ
VSLEEP
VSLEEP
VL
ISET
IIN(MIN)
IRUN
η
VBRT_ADJ = 0VDC
VBRT_ADJ = 3VDC
IO(LAMP) = Maximum Lamp Current
IO(LAMP) = Minimum Lamp Current
VSET 0.4V
VIN1 = 12VDC, SLEEP < 0.8V
VIN1 = 12VDC, SLEEP 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS
VIN1 = 12VDC, SLEEP 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS
LXM1643-12-63
Units
Min Typ Max
-300
50
2.0
2.05
µADC
µADC
VDC
0.4 0.5
VDC
2.0
-0.3
VIN1
0.8
VDC
VDC
-300
0.4
V
µA
0.0 10 30 µADC
1450
mADC
88 %
FUNCTIONAL PIN DESCRIPTION
CONN
PIN
DESCRIPTION
CN1 (Molex 53261-1290) Mates with 51021-1200 housing, 50079-8100 pins. Mates with LX9508 input cable assembly
CN1-1,2,3 VIN1 Main Input Power Supply (10.8V < VIN1 < 13.2V)
CN1-4,5,6
GND
Power Supply Return
CN1-7
CN1-8
AGND
NC
Analog Signal Ground
No Connect
CN1-9
SLEEP ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON
CN1-10
BRITE Brightness Control (0.5V to 2.0VDC). 2.0VDC gives maximum lamp current.
CN1-11
SET1
SET1 MSB Connecting this pin to ground decreases the output current (see Table 1)
CN1-12
SET2
SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)
CN2, CN5 (JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00)
CN2, CN5-
1,2
VHI
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN3, CN4 (SM02(4.0)B-BHS-1-TB or equivalent connectors)
CN3, CN4-
1,2
VLO
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
Copyright © 2004
Rev. 1.0, 2005-03-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3


LXM1643-12-63 (Microsemi Corporation)
12V Quad 6W CCFL Programmable Inverter Module

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PanelMatch™
LXM1643-12-63
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 11)
Open*
SET2
(Pin 12)
Open*
Open*
Ground
Ground
Open*
Ground
Ground
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
Nominal Output Current
8.0mA
7.0mA
6.0mA
5.0mA
PHYSICAL DIMENSIONS
6mm
0.24in
4mm
0.16in
182mm
7.165in.
LXM1643-12-63
188mm
7.40in.
36mm
1.42in.
CN2
CN3
CN1
28mm ± 0.2mm
1.10in.
CN4
W
4mm
0.16in
CN5
W
94mm
3.70in.
88mm ± 0.2mm
3.465in.
4mm GROUNDED MOUNTING HOLES
0.16in. 3.18MM ±.08 DIA.
88mm ± 0.2mm
3.465in.
4.7mm
0.18in.
1.7mm
PCB tolerances ± 0.5mm
0.67in.
All dimensions are in millimeters, inches are for reference only.
Weight: (45g) typ.
Warning
High Voltage Present at
high side of Transformer
and Output Connector
8mm Max
0.315in.
SIMPLIFIED BLOCK DIAGRAM
V B R IT E
0.5 -
2VDC
SET1
SET2
+3V
Controller
10K
Comparator
+
Ramp
-
+3V
10K
Ramp
Gen
+3V
10K
High Voltage Transformers
Output
Driver
VIN1
Z
OCSENSE
OVSENSE
Z
ISENSE
One of two
Z
VHI
VHI
VLO
VLO
Copyright © 2004
Rev. 1.0, 2005-03-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4


LXM1643-12-63 (Microsemi Corporation)
12V Quad 6W CCFL Programmable Inverter Module

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PanelMatch™
LXM1643-12-63
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot
0.45V
to 2.0V
20K
1.8K
BRITE
12V
VIN1
VHx
VHx
LXM1643-12-63
SLEEP
SET1 SET2
NC NC
VLOx
VLOx
GND
One of
two
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
10us to 125uS
0 < P.W. < 100% of period
LXM1643-12-63
Figure 1A – PWM Brightness Control
BRITE
12V
VIN1
LXM1643-12-63
SLEEP
SET 1 SET 2
GND
One
of two
L L 5.0mARMS
L H 6.0mARMS
H L 7.0mARMS
H H 8.0mARMS
L=GND; H=Open
Figure 2 – Max Output Current
(SET1 and SET2 Inputs)
ƒ The brightness control may be a voltage output DAC or
other voltage source, a digital pot or 20K manual pot. The
inverter contains an internal 10K pull-up to 3V to bias the
pot add a 1.8K resistor to set the lower threshold voltage.
A 3.3V Logic Level PWM signal from a micro-controller
may also be used as shown in Figure 1A.
ƒ If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the SLEEP input.
ƒ Connect VHI to high voltage wire from the lamp. Connect
VLO to the low voltage wire (wire with thinner insulation).
Never connect VLO to circuit ground as this will defeat
lamp current regulation. If both lamp wires have heavy
high voltage insulation, connect the longest wire to VLO.
This wire is typically white.
ƒ Use the SET1 and SET2 (see Figure 2) inputs to select the
desired maximum output current. Using these two pins in
combination allows the inverter to match a wide variety of
panels from different manufactures. Generally, the best
lamp lifetime correlates with driving the CCFL at the
manufactures nominal current setting. However the SET1
and SET2 inputs allow the user the flexibility to adjust the
current to the maximum allowable output current to
increase panel brightness at the expense of some reduced
lamp life.
ƒ Although the SET pins are designed such that just leaving
them open or grounding them is all that is needed to set the
output current, they can also be actively set. Using a open
collector or open drain logic signal will allow you to
reduce the lamp current for situations where greater dim
range is required, as an example in nighttime situations. In
conjunction with a light sensor or other timer the panel
could be set to higher brightness (maximum output
current) for daytime illumination and lower brightness
(minimum or typical output current) at nighttime. Since
the dim ratio is a factor of both the burst duty cycle and the
peak output current, using this technique the effective dim
ratio can be increased greater than the burst duty cycle
alone. Conversely, the SET inputs could be used to
overdrive the lamp temporarily to facilitate faster lamp
warm up at initial lamp turn on. Of course any possible
degradation on lamp life from such practices is the users
responsibility since not all lamps are designed to be
overdriven.
ƒ The inverter has a built in fault timeout function. If the
output return is open (lamp disconnected or broken) or
shorted the inverter will attempt to strike the lamp for
several seconds. After about a second without success the
inverter will shutdown. In order to restart the inverter it is
necessary to toggle the sleep input or cycle the VIN1 input
supply. In the timeout shutdown mode input drain current
will be about 8mA.
Copyright © 2004
Rev. 1.0, 2005-03-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5


LXM1643-12-63 (Microsemi Corporation)
12V Quad 6W CCFL Programmable Inverter Module

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PanelMatch™
LXM1643-12-63
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
NOTES
Copyright © 2004
Rev. 1.0, 2005-03-15
PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and
is current as of publication date. This document may not be modified in any way without the
express written consent of Microsemi. Product processing does not necessarily include testing of
all parameters. Microsemi reserves the right to change the configuration and performance of the
product and to discontinue product at any time.
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6




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