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ATASHEET
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Page 1
Copyright © 2002
Rev. 1.1, 2006-11-15
WWW.Microsemi .COM
PanelMatch
™
LXMG1623-05-44
5V Dual 4W CCFL Programmable Inverter Module
TM ®
DESCRIPTION
The LXMG1623-05-44 is a Dual 4W
Output Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed to be
compatible with the Sh arp LQ104S1DG21
/ 51 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
LXMG1623 modules provide the
designer with a vastly superior display
brightness range. This brightness range is
achievable wit h vi rt uall y any LC D di spl ay .
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.
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 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 12V input inverter is also
available (LXMG1623-12-44).
The modules design utilizes
Microsemi’s 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
RoHS Compliant
APPLICATIONS
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
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
UNIVERSAL DIMMING INPUT
"PWM", VDC, OR POTENTIOMETER
SELECTABLE MAXIMUM OUTPUT CURRENT 5MA
TO 5.2MA RMS TO 6.7MARMS
123
W
123
W
DC Voltage
Source Potentiometer PWM
Signal
PACKAGE ORDER INFO
PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
LXMG1623-05-44 JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00 JST BHR-03VS-1
L
LX
XM
MG
G1
16
62
23
3-
-0
05
5-
-4
44
4
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ATASHEET
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Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2002
Rev. 1.1, 2006-11-15
WWW.Microsemi .COM
PanelMatch
™
LXMG1623-05-44
5V Dual 4W CCFL Programmable Inverter Module
TM ®
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Input Signal Voltage (VIN1)....................................................................................................................................-0.3V to 6.5V
Input Power ....................................................................................................................................................................... 10W
Output Voltage, no load ............................................................................................................ Internally Limited to 1800VRMS
Output Current ............................................................................................................................7.5mARMS (Internally Limited)
Output Power (each output) ............................................................................................................................................. 4.0W
Input Signal Voltage ( SLEEP Input).....................................................................................................................-0.3V to 5.5V
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) 4.75 5 5.25
Input Supply Voltage Range (Functional)
VIN1
4.5 5 5.5
V
Output Power (each output) PO 3.5 4.0 W
Linear BRITE Control Input Voltage Range VBRT_ADJ 0.5 2.0 V
Lamp Operating Voltage VLAMP 450 530 610 VRMS
Lamp Current (Full Brightness) IOLAMP 5.2 6.7 mARMS
Operating Ambient Temperature Range TA -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.
LXMG1623-05-44
Parameter Symbol Test Conditions Min Typ Max
Units
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current (each output) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Ground, ISET2 = Ground 4.7 5.2 5.7 mARMS
Full Bright Lamp Current (each output) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Ground, ISET2 = Open 5.2 5.7 6.2 mARMS
Full Bright Lamp Current (each output) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Ground 5.7 6.2 6.7 mARMS
Full Bright Lamp Current (each output) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Open 6.2 6.7 7.2 mARMS
Output Current Lamp to Lamp
Deviation ILL%DEV VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Open 3 10 %
Min. Average Lamp Current
(each output) IL(MIN) VBRT_ADJ ≤0.5VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = ISET2 = Ground 0.30 mARMS
Lamp Start Voltage VLS -20°C < TA < 70°C, VIN1 > 4.5VDC 1450 1600 VRMS
Operating Frequency fO VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 5V 57 60 63 kHz
Burst Frequency fBURST Output Burst Frequency 222 234 246 Hz
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D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2002
Rev. 1.1, 2006-11-15
WWW.Microsemi .COM
PanelMatch
™
LXMG1623-05-44
5V Dual 4W CCFL Programmable Inverter Module
TM ®
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.
LXMG1623-05-44
Parameter Symbol Test Conditions Min Typ Max
Units
` BRITE INPUT
VBRT_ADJ = 0VDC -300 µADC
Input Current IBRT VBRT_ADJ = 3VDC 50 µADC
Minimum Input for Max. Lamp Current VBRT_ADJ I
O(LAMP) = Maximum Lamp Current 2.0 2.05 VDC
Maximum Input for Min. Lamp Current VBRT_ADJ I
O(LAMP) = Minimum Lamp Current 0.4 0.5 VDC
` SLEEP INPUT
RUN Mode SLEEP
V 2.0 VIN1 V
DC
SLEEP Mode SLEEP
V -0.3 0.8 VDC
` SET1,2 INPUT
SET1,2 Low Threshold V
L 0.4 V
Input Current ISET V
SET ≤ 0.4V -300 µA
` POWER CHARACTERISTICS
Sleep Current IIN(MIN) VIN1 = 5VDC, SLEEP < 0.8V 0.0 10 50 µADC
Run Current IIN(RUN) VIN1 = 5VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 500VRMS 1460 mADC
Efficiency η VIN1 = 5VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 500VRMS 82 %
FUNCTIONAL PIN DESCRIPTION
CONN PIN DESCRIPTION
CN1 (Molex 53261-0871) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable assembly
CN1-1
CN1-2 VIN1 Main Input Power Supply (4.75< VIN1 < 5.25V)
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 2.0VDC). 2.0VDC gives maximum lamp current.
CN1-7 SET1 SET1 MSB Connecting this pin to ground decreases the output current (see Table 1)
CN1-8 SET2 SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)
CN2, CN3 for LXMG1623-05-44 (JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00)
CN2-1
CN3-1 VHI 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 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
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ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2002
Rev. 1.1, 2006-11-15
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PanelMatch
™
LXMG1623-05-44
5V Dual 4W CCFL Programmable Inverter Module
TM ®
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 7) SET2
(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.
PHYSICAL DIMENSIONS
LXMG1623-05-44
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
W
GROUNDED MOUNTING HOLE PLASTIC SCREW REQUIRED
10.5mm
0.413in.
6.75mm
0.266in.
PCB Tolerance ±0.5mm
W
W
Dimensions are in millimeters (inches are for reference)
SIMPLIFIED BLOCK DIAGRAM
Ramp
Gen
Transformer
Driver
0.5 -
2VDC
+
-
LAMP2
VLO
VHI
Comparator
Ramp
VBRITE
SET1
High Voltage
Transformer
ISENSE
OCSENSE
SET2
+3V
10K
10K
+3V
+3V
VIN1
OVSENSE
10K
Controller
LAMP1
VLO
VHI
VHI
Z
Z
Z
P
PA
AC
CK
KA
AG
GE
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TA
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P
RODUCTION
D
ATASHEET
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Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2002
Rev. 1.1, 2006-11-15
WWW.Microsemi .COM
PanelMatch
™
LXMG1623-05-44
5V Dual 4W CCFL Programmable Inverter Module
TM ®
TYPICAL APPLICATION
LXMG1623-05-44
5V
SET2GND
VHI
VLO
BRITE VIN1
SLEEP
SET1
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
LXMG1623-05-44
0 < P.W. < 100% of period
PWM Signal
from System
Figure 1A – PWM Brightness Control
LXMG1623-05-44
SET2GND
VHI
VLO
SLEEP
SET1
CCFL
TUBE
BRITE
5v
VIN1
ONE OF
TWO
L L 5.2mARMS
L H 5.7mARMS
H L 6.2mARMS
H H 6.7mARMS
L=GND; H=Open
Figure 2 – Max Output Current
(SET1 and SET2 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 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.
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.
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 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 VIN1 input
supply
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P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2002
Rev. 1.1, 2006-11-15
WWW.Microsemi .COM
PanelMatch
™
LXMG1623-05-44
5V Dual 4W CCFL Programmable Inverter Module
TM ®
NOTES
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.
N
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