P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright
2003
Rev. 1.0a, 2005-01-17
WWW
.
Microse
m
i
.
CO
M
PanelMatch
TM
LXM1623-12-44
12V Dual 4W CCFL Programmable Inverter Module
I N T E G R A T E D P R O D U C T S
D E S C R I P T I O N
The LXM1623-12-44 is a Dual 4W
Output Direct DriveTM CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed to be
compatible with the Sharp LQ104S1DG21
/ 15 10.4", LQ121S1DG31 / 41 12.1" as
well as the Samsung LTM121SI-T01
12.1" or similar dual lamp displays that
have both individual lamp output
connectors on the top side of the panel.
LXM1623 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,
a PWM signal or external Potentiometer.
The maximum output current is
externally programmable (through the
input connector) over a range of 5.2 to
6.7mA in 0.5mA steps. This allows the
inverter to match the panel's lamp current
specifications, or it can be used to
purposely drive the lamps at a lower
current to save power or lower nominal
brightness.
RangeMAXTM Digital Dimming
Technique provides flicker-free bright-
ness control in any wide range (typically
50:1+) dimming application.
The resultant "burst drive" that
energizes the lamp is 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 is also
available: LXM1623-05-44.
The modules design utilizes
Microsemi's LX1689 backlight con-
troller, 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.
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
K E Y F E A T U R E S
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 70C
A P P L I C A T I O N S
LCD's Requiring Both Output
Connectors on One Side of
Panel
Sharp LQ104S1DG21/51 and
LQ121S1DG31/41
Samsung
LTM121SI-T01
Desktop
Displays
Industrial Display Controls
B E N E F I T S
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
P R O D U C T H I G H L I G H T
DC Voltage
Source
Potentiometer
PWM
Signal
U
NIVERSAL
D
IMMING
I
NPUT
"
PWM
",
V
DC
, OR
P
OTENTIOMETER
1
2
3
1
2
3
S
ELECTABLE
M
AXIMUM
O
UTPUT
C
URRENT 5.2M
A
TO 6.7M
A
RMS
P A C K A G E O R D E R I N F O
P
ART
N
UMBER
O
UTPUT
C
ONNECTOR
I
NVERTER
M
ATES
D
IRECTLY
TO
P
ANEL
C
ONNECTORS
LXM1623-12-44 JST
SM02(8.0)B-BHS-1-TB
or Yeon Ho 20015WR-05A00
JST BHR-03VS-1
L
L
X
X
M
M
1
1
6
6
2
2
3
3
-
-
1
1
2
2
-
-
4
4
4
4
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright
2003
Rev. 1.0a, 2005-01-17
WWW
.
Microse
m
i
.
CO
M
PanelMatch
TM
LXM1623-12-44
12V Dual 4W CCFL Programmable Inverter Module
I N T E G R A T E D P R O D U C T S
A B S O L U T E M A X I M U M R A T I N G S
( N O T E 1 )
Input Signal Voltage (V
IN1
).....................................................................................................................................-0.3V to 16V
Input Power ....................................................................................................................................................................... 10W
Output Voltage, no load ............................................................................................................ Internally Limited to 1800V
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.....................................................................................................-20C to 70C
Operating Relative Humidity, non-condensing ................................................................................................................
90%
Storage Temperature Range...............................................................................................................................-40C to 85C
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.
R E C O M M E N D E D O P E R A T I N G C O N D I T I O N S ( 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
Min R.C. Max
Units
Input Supply Voltage Range (Fully Regulated
Lamp Current)
10.8 12 13.2
Input Supply Voltage Range (Functional)
V
IN1
10.2 12 14.4
V
Output Power (each output)
P
O
3.5
4.0 W
Linear BRITE Control Input Voltage Range
V
BRT_ADJ
0.5 2.0 V
Lamp Operating Voltage
V
LAMP
450 530 610 V
RMS
Lamp Current (Full Brightness)
I
OLAMP
5.2 6.7
mA
RMS
Operating Ambient Temperature Range
T
A
-20 70 C
E L E C T R I C A L C H A R A C T E R I S T I C S
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25C except where otherwise noted.
LXM1623-12-44
Parameter Symbol Test
Conditions
Min Typ Max
Units
OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current (each output)
I
L(MAX)
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Ground, I
SET2
= Ground
4.7 5.2 5.7
mA
RMS
Full Bright Lamp Current (each output)
I
L(MAX)
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Ground, I
SET2
= Open
5.2 5.7 6.2
mA
RMS
Full Bright Lamp Current (each output)
I
L(MAX)
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Open, I
SET2
= Ground
5.7 6.2 6.7
mA
RMS
Full Bright Lamp Current (each output)
I
L(MAX)
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Open, I
SET2
= Open
6.2 6.7 7.2
mA
RMS
Output Current Lamp to Lamp
Deviation
I
LL%DEV
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= Open, I
SET2
= Open
3
10
%
Min. Average Lamp Current
(each output)
I
L(MIN)
V
BRT_ADJ
0.5V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
DC
I
SET1
= I
SET2
= Ground
0.30
mA
RMS
Lamp Start Voltage
V
LS
-20C
<
T
A
< 70C, V
IN1
> 10.8V
DC
1450
1600
V
RMS
Operating Frequency
f
O
V
BRT_ADJ
= 2.5V
DC
,
SLEEP
> 2.0V, V
IN1
= 12V
57
60
63
kHz
Burst Frequency
f
BURST
Output Burst Frequency
222
234
246
Hz
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright
2003
Rev. 1.0a, 2005-01-17
WWW
.
Microse
m
i
.
CO
M
PanelMatch
TM
LXM1623-12-44
12V Dual 4W CCFL Programmable Inverter Module
I N T E G R A T E D P R O D U C T S
E L E C T R I C A L C H A R A C T E R I S T I C S ( C O N T I N U E D )
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25C except where otherwise noted.
LXM1623-12-44
Parameter Symbol Test
Conditions
Min Typ Max
Units
BRITE INPUT
V
BRT_ADJ
= 0V
DC
-300
A
DC
Input Current
I
BRT
V
BRT_ADJ
= 3V
DC
50
A
DC
Minimum Input for Max. Lamp Current V
BRT_ADJ
I
O(LAMP)
= Maximum Lamp Current
2.0
2.05
V
DC
Maximum Input for Min. Lamp Current V
BRT_ADJ
I
O(LAMP)
= Minimum Lamp Current
0.4
0.5
V
DC
SLEEP INPUT
RUN Mode
SLEEP
V
2.0
V
IN1
V
DC
SLEEP Mode
SLEEP
V
-0.3
0.8
V
DC
SET
1,2
INPUT
SET
1,2
Low Threshold
V
L
0.4 V
Input Current
I
SET
V
SET
0.4V
-300
A
POWER CHARACTERISTICS
Sleep Current
I
IN(MIN)
V
IN1
= 12V
DC
,
SLEEP
< 0.8V
0.0 10 50 A
DC
Run Current
I
IN(RUN)
V
IN1
= 12V
DC
,
SLEEP
2.0V, I
SET1
= Open
I
SET2
= Ground, V
LAMP
= 500V
RMS
550 mA
DC
Efficiency
V
IN1
= 12V
DC
,
SLEEP
2.0V, I
SET1
= Open
I
SET2
= Ground, V
LAMP
= 500V
RMS
90 %
F U N C T I O N A L P I N D E S C R I P T I O N
C
ONN
P
IN
D
ESCRIPTION
CN1
(Molex 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501 input cable assembly
CN1-1
CN1-2
V
IN1
Main Input Power Supply (10.8V < V
IN1
< 13.2V)
CN1-3
CN1-4
GND Power
Supply
Return
CN1-5
SLEEP
ON/OFF Control. (0V <
SLEEP
< 0.8 = OFF,
SLEEP
>= 2.0V = ON
CN1-6
BRITE
Brightness Control (0.5V to 2.0V
DC
). 2.0V
DC
gives maximum lamp current.
CN1-7 SET
1
SET
1
MSB Connecting this pin to ground decreases the output current (see Table 1)
CN1-8 SET
2
SET
2
LSB Connecting this pin to ground decreases the output current (see Table 1)
CN2, CN3 for LXM1623-12-44
(JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00)
CN2-1
CN3-1
V
HI
High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT
connect to Ground.
CN2-2
CN3-2
V
LO
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT
connect to Ground
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright
2003
Rev. 1.0a, 2005-01-17
WWW
.
Microse
m
i
.
CO
M
PanelMatch
TM
LXM1623-12-44
12V Dual 4W CCFL Programmable Inverter Module
I N T E G R A T E D P R O D U C T S
T A B L E 1
OUTPUT CURRENT SETTINGS
SET
1
(Pin 7)
SET
2
(Pin 8)
Nominal Output Current
Open*
Open*
6.7mA
Open*
Ground
6.2mA
Ground
Open*
5.7mA
Ground
Ground
5.2mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
P H Y S I C A L D I M E N S I O N S
L X M 1 6 2 3 - 1 2 - 4 4
108.7mm
4.28in.
CN1
22.35mm
0.88in.
3.05MM X 2
DIA
. 0.08
6MM SCREW HEAD CLEARANCE
Weight: (18g) typ
.
85.75mm 0.2mm
3.375in.
12.7mm 0.2mm
0.500in.
19.45mm
0.765in.
10.2mm Max
0.402in.
Warning
High Voltage
Present at high
side of transformer
and Output
Connectors
G
ROUNDED
M
OUNTING
H
OLE
P
LASTIC
S
CREW
R
EQUIRED
10.5mm
0.413in.
6.75mm
0.266in.
PCB Tolerance 0.5mm
Dimensions are in millimeters (inches are for reference only)
S I M P L I F I E D B L O C K D I A G R A M
Ramp
Gen
Transformer
Driver
0.5 -
2V
DC
+
-
LA
M
P
2
V
LO
V
HI
Comparator
Ramp
V
BRITE
SET
1
High Voltage
Transformer
I
SENSE
OC
SENSE
SET
2
+3V
10K
10K
+3V
+3V
V
IN1
OV
SENSE
10K
Controller
LA
M
P
1
V
LO
V
HI
V
HI
Z
Z
Z
P
P
A
A
C
C
K
K
A
A
G
G
E
E
D
D
A
A
T
T
A
A
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright
2003
Rev. 1.0a, 2005-01-17
WWW
.
Microse
m
i
.
CO
M
PanelMatch
TM
LXM1623-12-44
12V Dual 4W CCFL Programmable Inverter Module
I N T E G R A T E D P R O D U C T S
T Y P I C A L A P P L I C A T I O N
LXM1623-12-44
12V
SET
2
GND
V
HI
V
LO
BRITE
V
IN1
SLEEP
SET
1
0.45V
to
2.0V
1.8K
20K
DAC or
Pot
CCFL
TUBE
NC
NC
ONE OF
TWO
Figure 1
Brightness Control
(Output current set to maximum)
P.W.
2.5us to 125uS
BRITE
LXM1623-12-44
0 < P.W. < 100% of period
PWM Signal
from System
Figure 1A
PWM Brightness Control
LXM1623-12-44
SET
2
GND
V
HI
V
LO
SLEEP
SET
1
CCFL
TUBE
BRITE
12V
V
IN1
ONE OF
TWO
L L 5.2mA
RMS
L H 5.7mA
RMS
H L 6.2mA
RMS
H H 6.7mA
RMS
L=GND; H=Open
Figure 2
Max Output Current
(SET
1
and SET
2
Inputs)
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 to
ground the inverter will attempt to strike the lamp for
several seconds. After about 3 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
A
A
P
P
P
P
L
L
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