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Rev. 1.0b, 2005-01-17
WWW.Microsemi .COM
PanelMatch
™
LXM1623-12-4x
12V Dual 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
DESCRIPTION
The LXM1623-12-4x 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.
LXM1623 modules provide the
designer with a vastly superior display
brightness range. This brightness range is
achievable wit h vi rt ual l y 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 (LXM1623-05-4x), as well as
6W versions (LXM1623-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.
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
KEY FEATURES
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
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
PRODUCT HIGHLIGHT
DC Voltage
Source Potentiometer PWM
Signal
U
NIVERSAL
D
IMMING
I
NPUT
"PWM", V
DC
,
OR
P
OTENTIOMETER
123
W
123
W
S
ELECTABLE
M
AXIMUM
O
UTPUT
C
URRENT
5
M
A
TO
6.5
M
A
RMS
PACKAGE ORDER INFO
P
ART
N
UMBER
O
UTPUT
C
ONNECTOR
I
NVERTER
M
ATES
D
IRECTLY
TO
P
ANEL
C
ONNECTORS
LXM1623-12-41 JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00 JST BHR-03VS-1
LXM1623-12-42 JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00 JST BHSR-02VS-1
LXM1623-12-43 Honda QZ-19-A3MYL #02 Honda QZ-19-3F01
L
LX
XM
M1
16
62
23
3-
-1
12
2-
-4
4X
X
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2002
Rev. 1.0b, 2005-01-17
WWW.Microsemi .COM
PanelMatch
™
LXM1623-12-4x
12V Dual 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2002
Rev. 1.0b, 2005-01-17
WWW.Microsemi .COM
PanelMatch
™
LXM1623-12-4x
12V Dual 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
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.
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
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 13.8
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
350 440 530 V
RMS
Lamp Current (Full Brightness) I
OLAMP
5 6.5 mA
RMS
Operating Ambient Temperature Range T
A
-20 70 °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.
LXM1623-12-4x
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 4.5 5 5.5 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 5.0 5.5 6.0 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 5.5 6 6.5 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 6.0 6.5 7.0 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
-20°C < T
A
< 70°C, V
IN1
> 10.8V
DC
1250 1400 V
RMS
Operating Frequency f
O
V
BRT_ADJ
= 2.5V
DC
, SLEEP > 2.0V, V
IN1
= 12V 76 80 83 kHz
Burst Frequency f
BURST
Output Burst Frequency 148 156 163 Hz
E
EL
LE
EC
CT
TR
RI
IC
CA
AL
LS
S
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RODUCTION
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ATASHEET
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Page 4
Copyright © 2002
Rev. 1.0b, 2005-01-17
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PanelMatch
™
LXM1623-12-4x
12V Dual 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
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.
LXM1623-12-4x
Parameter Symbol Test Conditions Min Typ Max
Units
`
BRITE INPUT
V
BRT_ADJ
= 0V
DC
-300 µA
DC
Input Current I
BRT
V
BRT_ADJ
= 3V
DC
50 µA
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 µA
`
POWER CHARACTERISTICS
Sleep Current I
IN(MIN)
V
IN1
= 12V
DC
, SLEEP < 0.8V 0.0 10 50 µA
DC
Run Current I
IN(RUN)
V
IN1
= 12V
DC
, SLEEP ≥ 2.0V, I
SET1
= Open
I
SET2
= Ground, V
LAMP
= 440V
RMS
530 mA
DC
Efficiency η V
IN1
= 12V
DC
, SLEEP ≥ 2.0V, I
SET1
= Open
I
SET2
= Ground, V
LAMP
= 440V
RMS
85 %
FUNCTIONAL PIN DESCRIPTION
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 LXM1623-12-4 1 an d -42 (JST SM02(8.0)B-BHS-1-TB | Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB |
Yeon Ho 35001WR-02A00)
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
CN2, CN3 for LXM1623-12-4 3 (Honda QZ-19-A3MYL #02)
CN2-3
CN3-3 V
HI
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-1
CN3-1 V
LO
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
E
EL
LE
EC
CT
TR
RI
IC
CA
AL
LS
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ATASHEET
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Rev. 1.0b, 2005-01-17
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PanelMatch
™
LXM1623-12-4x
12V Dual 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
TABLE 1
OUTPUT CURRENT SETTINGS
SET
1
(Pin 7) SET
2
(Pin 8) Nominal Output Current
Open* Open* 6.5mA
Open* Ground 6.0mA
Ground Open* 5.5mA
Ground Ground 5.0mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXM1623-12-4X
115mm
4.52in.
CN1
1.0mm
0.0392in.
30mm
1.18in.
GROUNDED MOUNTING HOLE
3MM X 2 DIA. ±0.08
6MM SCREW HEAD CLEARANCE
Weight: (15g) typ.
109mm
4.29in.
26mm
1.02in.
CN3
CN2
4mm
0.15in.
6mm
0.23in.
6.5mm Max
0.256in.
Warning
High Voltage
Present at high
side of transformer
and Output
Connector
PCB tolerances ± 0.5mm
Dimensions are in millimeters (inches for reference only)
SIMPLIFIED BLOCK DIAGRAM
Ramp
Gen
Transformer
Driver
0.5 -
2V
DC
+
-
LAMP
V
LO
V
HI
Comparator
Ramp
V
BRITE
SET
1
High Voltage
Transformer
I
SENSE
OV
SENSE
SET
2
+3V
10K
10K
+3V
+3V
V
IN1
OC
SENSE
10K
Controller
One of two
P
PA
AC
CK
KA
AG
GE
E
D
DA
AT
TA
A
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RODUCTION
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ATASHEET
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Rev. 1.0b, 2005-01-17
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PanelMatch
™
LXM1623-12-4x
12V Dual 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
TYPICAL APPLICATION
LXM1623-12-4x
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.
10us to 125uS
BRITE
LXM1623-12-4x
0 < P.W. < 100% o f period
PWM Signal
from System
Figure 1A – PWM Brightness Control
LXM1623-12-4x
SET
2
GND
V
HI
V
LO
SLEEP
SET
1
CCFL
TUBE
BRITE
12V
V
IN1
ONE OF
TWO
L L 5.0mA
RMS
L H 5.5mA
RMS
H L 6.0mA
RMS
H H 6.5mA
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
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
A
AP
PP
PL
LI
IC
CA
AT
TI
IO
ON
N
P
RODUCTION
D
ATASHEET
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Page 7
Copyright © 2002
Rev. 1.0b, 2005-01-17
WWW.Microsemi .COM
PanelMatch
™
LXM1623-12-4x
12V Dual 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
NOTES
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is curren t as of publication date. This document may not be modified in
any way without the ex press written consent of Microsem i. Product processing does not
necessarily include test ing of all parameters. Microsemi reserves the right to change the
configuration and per formance of the product and to discontinue product at any time.
N
NO
OT
TE
ES
S
