PanelMatch™
TM
®
LXMG1623-12-4x
P
RODUCTION
D
ATASHEET
12V Dual 4W CCFL Programmable Inverter Module
DESCRIPTION
KEY FEATURES
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Microsemi
.C
OM
The LXMG1623-12-4x is a Dual 4W
Output Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed for driving
LCD backlight lamps. It is ideal for
driving typical 6.4” to 10.4” TFT panels.
LXMG1623 modules provide the
designer with a vastly superior display
brightness range. This brightness range is
achievable with virtually any LCD display.
The modules are available with a
dimming input that permits brightness
control from either a DC voltage source or
a PWM signal or external Potentiometer.
The maximum output current is externally
programmable over a range of 5 to 6.5mA
in 0.5mA steps to allow the inverter to
properly match to a wide array of LCD
panel lamp current specifications.
RangeMAX
Digital
Dimming
Technique provides flicker-free brightness
control in any wide range typically (50:1+)
dimming application.
The resultant “burst drive” that
energizes the lamp was designed
specifically to ensure that no premature
lamp degradation occurs, while allowing
significant power savings at lower dim
levels.
The modules convert DC voltage from
the system battery or AC adapter directly
to high frequency, high-voltage waves
required to ignite and operate CCFL
lamps. A 5V input inverter also is
available (LXMG1623-05-4x), as well as
6W versions (LXMG1623-xx-6x) for
driving larger higher voltage panels.
The modules design is based on
Microsemi’s new LX1689 backlight
controller, which provides a number of
cost and performance advantages due to
the controller’s high level of integration.
Other benefits of this new topology
are stable fixed-frequency operation,
secondary-side strike-voltage regulation
and both open/shorted lamp protection
with fault timeout.
Externally Programmable
Maximum Output Current
Easy to Use Brightness Control
RangeMAX Wide Range Dimming
Output Open & Short-Circuit
Protection and Automatic Strike-
Voltage Regulation and Timeout
Fixed Frequency Operation
Rated From -20 to 70°C
UL60950 E175910
RoHS Compliant
APPLICATIONS
High Brightness Displays
Portable Instrumentation
Desktop Displays
Industrial Display Controls
BENEFITS
Smooth, Flicker Free 2%-100%
Full-Range Brightness Control
Programmable output current
allows inverter to mate with a
wide variety of LCD panel’s
specifications
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For High Reliability
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; 6,198, 234; Patents Pending
PRODUCT HIGHLIGHT
U
NIVERSAL
D
IMMING
I
NPUT
"
PWM
",
V
DC
, OR
P
OTENTIOMETER
DC Voltage
Source
Potentiometer
PWM
Signal
Microsemi
S
ELECTABLE
M
AXIMUM
O
UTPUT
C
URRENT 5M
A
TO 6.5M
A
RMS
PACKAGE ORDER INFO
P
ART
N
UMBER
LXMG1623-12-41
LXMG1623-12-42
O
UTPUT
C
ONNECTOR
JST SM02(8.0)B-BHS-1-TB (LF)(SN) or Yeon Ho 20015WR-05A00
JST SM02B-BHSS-1-TB (LF)(SN) or Yeon Ho 35001WR-02A00
I
NVERTER
M
ATES
D
IRECTLY
TO
P
ANEL
C
ONNECTORS
JST BHR-03VS-1
JST BHSR-02VS-1
Copyright
©
2002
Rev. 1.1, 2006-11-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
1
2
3
1
LXMG1623-12-4
X
LXMG1623-12-4
X
2
3
Page 1
PanelMatch™
TM
®
LXMG1623-12-4x
P
RODUCTION
D
ATASHEET
12V Dual 4W CCFL Programmable Inverter Module
ABSOLUTE MAXIMUM RATINGS
(NOTE 1)
Input Signal Voltage (V
IN1
).....................................................................................................................................-0.3V to 15V
Input Power ....................................................................................................................................................................... 10W
Output Voltage, no load ............................................................................................................ Internally Limited to 1500V
RMS
Output Current ............................................................................................................................7.5mA
RMS
(Internally Limited)
Output Power (each output) ............................................................................................................................................. 4.0W
Input Signal Voltage (
SLEEP
Input) ..................................................................................................................... -0.3V to V
IN1
Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V
Ambient Operating Temperature, zero airflow.....................................................................................................-20°C to 70°C
Operating Relative Humidity, non-condensing ................................................................................................................
≤
90%
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.
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OM
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
Input Supply Voltage Range (Fully Regulated
Lamp Current)
Input Supply Voltage Range (Functional)
Output Power (each output)
Linear BRITE Control Input Voltage Range
Lamp Operating Voltage
Lamp Current (Full Brightness)
Operating Ambient Temperature Range
Symbol
V
IN1
P
O
V
BRT_ADJ
V
LAMP
I
OLAMP
T
A
0.5
350
5
-20
Recommended Operating Conditions
Min
R.C.
Max
10.8
10.2
12
12
3.5
440
13.2
13.8
4.0
2.0
530
6.5
70
Units
V
W
V
V
RMS
mA
RMS
°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
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
Copyright
©
2002
Rev. 1.1, 2006-11-15
I
L(MAX)
I
L(MAX)
I
L(MAX)
I
L(MAX)
I
LL%DEV
I
L(MIN)
V
LS
f
O
f
BURST
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Ground, I
SET2
= Ground
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Ground, I
SET2
= Open
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Open, I
SET2
= Ground
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Open, I
SET2
= Open
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Open, I
SET2
= Open
V
BRT_ADJ
≤0.5V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= I
SET2
= Ground
-20°C < T
A
< 70°C, V
IN1
> 10.8V
DC
V
BRT_ADJ
= 2.5V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
Output Burst Frequency
4.5
5.0
5.5
6.0
5
5.5
6
6.5
3
0.30
1250
76
148
1400
80
156
83
163
5.5
6.0
6.5
7.0
10
mA
RMS
mA
RMS
Symbol
Test Conditions
LXMG1623-12-4x
Min
Typ
Max
Units
E
LECTRICALS
E
LECTRICALS
mA
RMS
mA
RMS
%
mA
RMS
V
RMS
kHz
Hz
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
PanelMatch™
TM
®
LXMG1623-12-4x
P
RODUCTION
D
ATASHEET
12V Dual 4W CCFL Programmable Inverter Module
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
BRITE INPUT
Input Current
Minimum Input for Max. Lamp Current
Maximum Input for Min. Lamp Current
SLEEP INPUT
RUN Mode
SLEEP Mode
SET
1,2
INPUT
SET
1,2
Low Threshold
Input Current
POWER CHARACTERISTICS
Sleep Current
Run Current
Efficiency
I
IN(MIN)
I
IN(RUN)
η
V
IN1
= 12V
DC
,
SLEEP
< 0.8V
V
IN1
= 12V
DC
,
SLEEP
≥
2.0V, I
SET1
= Open
I
SET2
= Ground, V
LAMP
= 440V
RMS
V
IN1
= 12V
DC
,
SLEEP
≥
2.0V, I
SET1
= Open
I
SET2
= Ground, V
LAMP
= 440V
RMS
0.0
10
530
85
50
µA
DC
mA
DC
%
V
L
I
SET
0.4
V
SET
≤
0.4V
-300
V
µA
I
BRT
V
BRT_ADJ
V
BRT_ADJ
V
BRT_ADJ
= 0V
DC
V
BRT_ADJ
= 3V
DC
I
O(LAMP)
= Maximum Lamp Current
I
O(LAMP)
= Minimum Lamp Current
-300
50
2.0
0.5
µA
DC
µA
DC
V
DC
V
DC
V
DC
V
DC
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Microsemi
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OM
Symbol
Test Conditions
LXMG1623-12-4x
Min
Typ
Max
Units
2.05
0.4
2.0
-0.3
V
SLEEP
V
SLEEP
V
IN1
0.8
FUNCTIONAL PIN DESCRIPTION
C
ONN
CN1-1
CN1-2
CN1-3
CN1-4
CN1-5
CN1-6
CN1-7
CN1-8
P
IN
D
ESCRIPTION
CN1
(Molex 53261-0871) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable assembly
V
IN1
GND
Main Input Power Supply (10.8V < V
IN1
< 13.2V)
Power Supply Return
ON/OFF Control. (0V <
SLEEP
< 0.8 = OFF,
SLEEP
>= 2.0V = ON
Brightness Control (0.5V to 2.0V
DC
). 2.0V
DC
gives maximum lamp current.
SET
1
MSB Connecting this pin to ground decreases the output current (see Table 1)
SET
2
LSB Connecting this pin to ground decreases the output current (see Table 1)
SLEEP
BRITE
SET
1
SET
2
CN2, CN3 for LXMG1623-12-41 and -42
(JST SM02(8.0)B-BHS-1-TB (LF)(SN) | Yeon Ho 20015WR-05A00 or SM02B-BHSS-
1-TB (LF)(SN) | Yeon Ho 35001WR-02A00)
E
LECTRICALS
E
LECTRICALS
CN2-1
CN3-1
CN2-2
CN3-2
V
HI
V
LO
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT
connect to Ground.
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT
connect to Ground
Copyright
©
2002
Rev. 1.1, 2006-11-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
PanelMatch™
TM
®
LXMG1623-12-4x
P
RODUCTION
D
ATASHEET
12V Dual 4W CCFL Programmable Inverter Module
TABLE 1
OUTPUT CURRENT SETTINGS
SET
1
(Pin 7)
Open*
Open*
Ground
Ground
SET
2
(Pin 8)
Open*
Ground
Open*
Ground
Nominal Output Current
6.5mA
6.0mA
5.5mA
5.0mA
PHYSICAL DIMENSIONS
LXMG1623-12-4X
115mm
4.52in.
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OM
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
109mm
4.29in.
G
ROUNDED
M
OUNTING
H
OLE
3MM X 2
DIA
. ±0.08
6MM SCREW HEAD CLEARANCE
CN1
30mm
1.18in.
CN2
26mm
1.02in.
CN3
4mm
0.15in.
6mm
0.23in.
1.0mm
0.0392in.
Weight: (15g) typ
.
PCB tolerances ± 0.5mm
Warning
High Voltage
6.5mm Max
Present at high
0.256in.
side of transformer
and Output
Connector
Dimensions are in millimeters (inches for reference only)
SIMPLIFIED BLOCK DIAGRAM
+3V
Controller
V
BRITE
0.5 -
2V
DC
10K
Comparator
+
Ramp
-
+3V
10K
SET
1
+3V
10K
High Voltage
Transformer
V
IN1
V
HI
Transformer
Driver
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Ramp
Gen
OC
SENSE
OV
SENSE
I
SENSE
One of two
V
LO
SET
2
Copyright
©
2002
Rev. 1.1, 2006-11-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LAMP
Page 4
PanelMatch™
TM
®
LXMG1623-12-4x
P
RODUCTION
D
ATASHEET
12V Dual 4W CCFL Programmable Inverter Module
TYPICAL APPLICATION
12V
DAC or
Pot
0.45V
20K
to
2.0V
1.8K
BRITE
V
IN1
V
HI
LXMG1623-12-4x
CCFL
TUBE
WWW .
Microsemi
.C
OM
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.
If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the
SLEEP
input.
Connect V
HI
to high voltage wire from the lamp. Connect
V
LO
to the low voltage wire (wire with thinner insulation).
Never connect V
LO
to circuit ground as this will defeat
lamp current regulation. If both lamp wires have heavy
high voltage insulation, connect the longest wire to V
LO
.
This wire is typically white.
Use the SET
1
and SET
2
(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 SET
1
and SET
2
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.
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.
The inverter has a built in fault timeout function. If the
output is open (lamp disconnected or broken) or shorted
the inverter will attempt to strike the lamp for several
seconds. After about 2 seconds without success the inverter
will shutdown. In order to restart the inverter it is
necessary to toggle the sleep input or cycle the V
IN1
input
supply
SLEEP
SET
1
SET
2
NC
NC
GND
V
LO
ONE OF
TWO
Figure 1
– Brightness Control
(Output current set to maximum)
PWM Signal
from System
P.W.
BRITE
LXMG1623-12-4x
10us to 125uS
0 < P.W. < 100% of period
Figure 1A
– PWM Brightness Control
12V
BRITE
V
IN1
V
HI
CCFL
TUBE
V
LO
ONE OF
TWO
LXMG1623-12-4x
SLEEP
SET
1
SET
2
GND
A
PPLICATION
A
PPLICATION
L
5.0mA
RMS
H
5.5mA
RMS
L
6.0mA
RMS
H
6.5mA
RMS
L=GND; H=Open
Figure 2
– Max Output Current
(SET
1
and SET
2
Inputs)
L
L
H
H
Copyright
©
2002
Rev. 1.1, 2006-11-15
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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