P
RODUCTI
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ATASHEET
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Page 1
Copyright © 2002
Rev. 1.0, 2006-03-10
WWW.Microsemi .COM
PanelMatch
™
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
TM ®
DESCRIPTION
The LXMG1618-05-4x is a Single
Output 4W Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed for driving
LCD backlight lamps. It is ideal for
driving typical 8.4” to 12.1” panels.
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.
The modules are include a dimming input
that permits brightness control from either
a DC voltage source, a PWM signal or an
external potentiometer.
LXMG1618 modules unlike the
LXMG1617 series does not provide wide
range ‘burst’ mode dimming, rather
dimming is provided by amplitude control
of the output curren t waveform, this limits
the potential dim range to typically less
than 5:1.
For applications not requiring wide
range dimming, amplitude control results
in lower ripple on the input supply and
reduced potential transient noise
generation. Many STN type panels are
particularly well suited for current
amplitude dimming.
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 (LXMG1618-12-4x).
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 and 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
Output Short-Circuit
Protection and Automatic
Strike-Voltage Regulation
and Timeout
Analog Current Amplitude
Dimming Method
Fixed Frequency Operation
Rated From -20 to 70°C
UL60950 Pending
RoHS Compliant
APPLICATIONS
Notebook And Sub-Notebook
Portable Instrumentation
Desktop Displays
Industrial Display Controls
BENEFITS
Compact, Low Profile Design
Mates to Wide Variety of
LCD Panels
Output Open Circuit Voltage
Regulation Minimizes
Corona Discharge For High
Reliability
PRODUCT HIGHLIGHT
UNIVERSAL DIMMING
I
NPUT
"PWM", VDC, OR POTENTIOMETER
SELECTABLE MAXIMUM OUPUT CURRENT
5MA TO 6.5MARMS
Microsemi
123
W
DC Voltage
Source Potentiometer PWM
Signal
PACKAGE ORDER INFO
PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1618-05-41 JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00 JST BHR-03VS-1
LXMG1618-05-42 JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00 JST BHSR-02VS-1
L
LX
XM
MG
G1
16
61
18
8-
-0
05
5
P
RODUCTI
ON
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2002
Rev. 1.0, 2006-03-10
WWW.Microsemi .COM
PanelMatch
™
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
TM ®
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Input Signal Voltage (VIN1) ................................................................................................................................... -0.3V to 6.5V
Input Power ......................................................................................................................................................................5.5W
Output Voltage, no load .............................................................................................................Internally Limited to 1600VRMS
Output Current............................................................................................................................ 7.5mARMS (Internally Limited)
Output Power....................................................................................................................................................................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
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 PO 3.5 4.0 W
Linear BRITE Control Input Voltage Range¹ VBRT_ADJ 0.65 to 0.9 2.0 V
Lamp Operating Voltage VLAMP 465 550 635* VRMS
Lamp Current (Full Brightness) IOLAMP 5 6.5 mARMS
Operating Ambient Temperature Range TA -20 70 °C
¹ The minimum VBRT ADJ voltage depends on the panel characteristics, depending on the panel it can vary from 0.65V to 0.9V
² Total output power must not exceed 4W. Higher voltage lamps may require maximum output current to be set lower than 6.5mARMS
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
LXMG1618-05-4x
Parameter Symbol Test Conditions Min Typ Max
Units
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Ground, ISET2 = Ground 4.5 5 5.5 mARMS
Full Bright Lamp Current IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Ground, ISET2 = Open 5.0 5.5 6.0 mARMS
Full Bright Lamp Current IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Ground 5.5 6 6.5 mARMS
Full Bright Lamp Current IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Open 6.0 6.5 7.0 mARMS
Min. Average Lamp Current
IL(MIN) VBRT_ADJ =0.65VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = ISET2 = Ground 1.5 * mARMS
Lamp Start Voltage VLS -20°C < TA < 70°C, VIN1 > 4.5VDC 1300 1400 VRMS
Operating Frequency fO VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 5V 76 80 83 kHz
* The Inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user responsibility to set the minimum
brightness (BRITE) input at or above the panel specification for minimum current.
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P
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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. 1.0, 2006-03-10
WWW.Microsemi .COM
PanelMatch
™
LXMG1618-05-4x
5V 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.
LXMG1618-05-4x
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
Minimum Input for Min. Lamp Current VBRT_ADJ I
O(LAMP) = Minimum Lamp Current 0.65* 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 5 20 µADC
Run Current IRUN VIN1 = 5VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS 830 mADC
Efficiency η VIN1 = 5VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS 80 %
* The Inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user’s responsibility to set the minimum brightness
(BRITE) input at or above the panel specification for minimum current. This is likely greater than the 0.65V minimum input.
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 (4.75V < 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 (0.65V 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 for LXMG1618-05-41 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)
CN2-1 VHI High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT
connect to Ground.
CN2-2 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
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CA
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P
RODUCTI
ON
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2002
Rev. 1.0, 2006-03-10
WWW.Microsemi .COM
PanelMatch
™
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
TM ®
TABLE 1 SETTING OUTPUT CURRENT
OUTPUT CURRENT SETTINGS
SET1
(Pin 7) SET2
(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
LXMG1618-05-4X
0.8mm
0.0315in.
Weight: (5.7g) typ.
4.6mm Max
0.181in.
86mm
3.39in
CN1
CN2
W
11mm
0.433in.
3.5mm
0.138in.
16mm
0.63in.
71mm
2.80in
12.5mm
0.492in
X
PCB tolerances ± 0.5mm, M2 or 2-56 recommended mounting screws
Warning
High Voltage Present at
high side of transformer
and Output Connector
GROUNDED MOUNTING
HOLE 2.44MM ±0.08 DIA.
MOUNTING HOLE
2.44MM ±0.08 DIA.
60mm ±0.2mm
2.36in.
9mm ±2mm
0.354 in.
R1.0
All dimensions are in millimeters, inches are for reference only
SIMPLIFIED BLOCK DIAGRAM
Ramp
Gen
Transformer
Driver
0.65 -
2V DC
+
-
LAMP
VLO
VHI
Comparator
Ramp
VBRITE
SET 1
High Voltage
Transformer
ISENSE
OV SENSE
SET 2
+3V
10K
10K
+3V
+3V
VIN1
OC SENSE
10K
Controller
P
PA
AC
CK
KA
AG
GE
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DA
AT
TA
A
P
RODUCTI
ON
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2002
Rev. 1.0, 2006-03-10
WWW.Microsemi .COM
PanelMatch
™
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
TM ®
TYPICAL APPLICATION
LXMG1618-05-4x
5V
SET2GND
VHI
VLO
BRITE VIN1
SLEEP
SET1
0.65V
to
2.0V
2.7K
20K
DAC or
Pot
CCFL
TUBE
NC NC
Figure 1 – Brightness Control
(output current set to maximum)
P.W.
10µs to 125µS
BRITE
LXMG1618-05-4x
~26 < P. W . < 100%
of period
PWM Signal
from System
Figure 1A – PWM Brightness Control
LXMG1618-05-4x
SET2GND
VHI
VLO
SLEEP
SET1
CCFL
TUBE
BRITE
5V
VIN1
L L 5.0mARMS
L H 5.5mARMS
H L 6.0mARMS
H H 6.5mARMS
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 2.7K 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 and efficiency 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 the peak output current, using this
technique the effective dim ratio can be increased.
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 as 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 VIN1 input
supply.
A
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ON
N
P
RODUCTI
ON
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2002
Rev. 1.0, 2006-03-10
WWW.Microsemi .COM
PanelMatch
™
LXMG1618-05-4x
5V 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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