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RODUCTION
D
AT
ASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2008
Rev. 1.1, 2009-11-03
WWW.Microsemi .COM
PanelMatch
™
"A Series" LXMG1618A-03-2x
3.3V 2.2W CCFL Programmable Inverter Module
TM ®
DESCRIPTION
The LXMG1618A-03-2x™ is a Single
Output 2.2W Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module designed for driving LCD
backlight lamps. It is ideal for driving
typically 3.9” to 6.4” panels.
The maximum output current is
externally programmable over a range of
3.5 to 5mA in 0.5mA steps (PanelMatch)
to allow the inverter to properly match to a
wide array of LCD panel lamp current
specifications. The modules include a
dimming input that permits brightness
control from a DC voltage source, a PWM
signal or an external potentiometer.
LXMG1618A modules unlike the
LXMG1617A series do not provide wide
range ‘burst’ mode dimming, rather
dimming is provided by amplitude control
of the output current waveform, and this
limits the potential dim range to typically
less than 5:1.
The module converts a DC voltage
from the system battery, or AC adapter
directly to high frequency, high-voltage
waveform required to ignite and operate
CCFL lamps. A 5V input inverter is also
available (LXMG1618A-05-2x).
The LXMG1618A modules contain
the newer highly integrated LX1691B
CCFL backlight controller to provide a
wider temperature range (-30°C to 80°C)
compared to the existing solutions offered
by Microsemi.
Other benefits of the inverter’s
topology include stable fixed-frequency
operation, secondary-side strike voltage
regulation and both open/shorted lamp
protection with fault timeout.
The new LXMG1618A (“A Series”)
modules are designed therefore as a
higher performance near drop-in
replacement (see BRITE minimum input)
for those customers and applications
currently using the LXMG1618 inverters.
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 -30°C to 80°C
UL60950 E175910
RoHS Compliant
APPLICATIONS
Medical Instrument Displays
Portable Instrumentation
(GPS, etc.)
Industrial Display Controls
BENEFITS
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
U
NIVERSAL
D
IMMING
INPUT
"PWM", VDC, OR POTENTIOMETER
DC Voltage
Source Potentiometer PWM
Signal
SELECTABLE MAXIMUM OUPUT
CURRENT 3.5MARMS TO 5MARMS
123
W
PACKAGE ORDER INFO
PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1618A-03-21 JST SM02(8.0)B-BHS-1-TB (LF)(SN) or Yeon Ho 20015WR-05A00 or equivalent JST BHR-03VS-1
LXMG1618A-03-22 JST SM02B-BHSS-1-TB (LF)(SN) or Yeon Ho 35001WR-02A00 or equivalent JST BHSR-02VS-1
L
LX
XM
MG
G1
16
61
18
8A
A-
-0
03
3-
-2
2X
X
P
RODUCTION
D
AT
ASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2008
Rev. 1.1, 2009-11-03
WWW.Microsemi .COM
PanelMatch
™
"A Series" LXMG1618A-03-2x
3.3V 2.2W CCFL Programmable Inverter Module
TM ®
ABSOLUTE MAXIMUM RATINGS
Input Signal Voltage (VIN) ........................................................................................................................................-0.3V to 5V
Input Power ...................................................................................................................................................................... 3.0W
Output Voltage, no load ............................................................................................................ Internally Limited to 1300VRMS
Output Current ...............................................................................................................................6mARMS (Internally Limited)
Output Power ................................................................................................................................................................... 2.3W
Input Signal Voltage ( SLEEP Input) .......................................................................................................................-0.3V to 5V
Input Signal Voltage (BRITE) ..................................................................................................................................-0.3V to 5V
Ambient Operating Temperature, zero airflow.....................................................................................................-30°C to 80°C
Storage Temperature Range...............................................................................................................................-40°C to 85°C
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, may not function optimally.
Recommended Operating Conditions
Parameter Symbol
Min R.C. Max Units
Input Supply Voltage Range (Fully Regulated
Lamp Current) 3 3.3 3.6
Input Supply Voltage Range (Functional)
VIN
3 4.2
V
Output Power PO 2.2 W
Linear BRITE Control Input Voltage Range¹ VBRT_ADJ 0 2.0 V
Lamp Operating Voltage VLAMP 325 380 435* VRMS
Lamp Current (Full Brightness) IOLAMP 3.5 5.0 mARMS
Operating Ambient Temperature Range TA -30 80 °C
¹ The BRITE minimum input voltage level is 0V, whereas it is 0.65V in the original LXMG1618-03-2x inverter, see application info on page 5. The minimum VBRT
ADJ voltage depends on the panel characteristics and minimum lamp current specification, depending on the panel it can vary from 0V to 0.5V
*Total output power must not exceed 2.2W. Higher voltage lamps may require maximum output current to be set lower than 5mARMS
ELECTRICAL CHARACTERISTICS
The following specifications apply over the recommended operating condition and ambient temperature of 0°C to 60°C except where
otherwise noted.
LXMG1618A-03-2x
Parameter Symbol Test Conditions Min Typ Max
Units
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current IL(MAX) VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 3.3V
ISET1 = Ground, ISET2 = Ground 3.0 3.5 4.0 mARMS
Full Bright Lamp Current IL(MAX) VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 3.3V
ISET1 = Ground, ISET2 = Open 3.5 4.0 4.5 mARMS
Full Bright Lamp Current IL(MAX) VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 3.3V
ISET1 = Open, ISET2 = Ground 4.0 4.5 5.0 mARMS
Full Bright Lamp Current IL(MAX) VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 3.3V
ISET1 = Open, ISET2 = Open 4.5 5 5.5 mARMS
Min. Average Lamp Current²
IL(MIN) VBRT_ADJ = 0V, SLEEP ≥ 2.0V, VIN = 3.3V
ISET1 = ISET2 = Ground 1.5 mARMS
Lamp Start Voltage VLS -30°C < TA < 80°C, VIN > 3V 1000 1200 VRMS
Operating Frequency fO VBRT_ADJ = 2V, SLEEP ≥ 2.0V, VIN = 3.3V 85 90 94 kHz
² 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 lamp current.
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P
RODUCTION
D
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ASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2008
Rev. 1.1, 2009-11-03
WWW.Microsemi .COM
PanelMatch
™
"A Series" LXMG1618A-03-2x
3.3V 2.2W CCFL Programmable Inverter Module
TM ®
ELECTRICAL CHARACTERISTICS (CONTINUED)
The following specifications apply over the recommended operating condition and ambient temperature of 0°C to 60°C except where
otherwise noted.
LXMG1618A-03-2x
Parameter Symbol Test Conditions Min Typ Max
Units
` BRITE INPUT
VBRT_ADJ = 0V -9 µA
Input Current IBRT VBRT_ADJ = 3V 0 µA
Minimum Input for Max. Lamp Current VBRT_ADJ I
O(LAMP) = Maximum Lamp Current 1.8 2.0 V
Maximum Input for Min. Lamp Current³ VBRT_ADJ I
O(LAMP) = Minimum Lamp Current 0 V
Minimum PWM Input Frequency FBRT_PWM 2 kHz
` SLEEP BAR INPUT
RUN Mode SLEEP
V 2.0 V
SLEEP Mode SLEEP
V -0.3 0.8 V
` SET1,2 INPUT
SET1,2 Low Threshold V
L 0.4 V
Input Current ISET V
SET = 0V -300 µA
` POWER CHARACTERISTICS
Sleep Current IIN(MIN) VIN = 3.3V, SLEEP ≤ 0.8V 3 10 µA
Run Current IRUN VIN = 3.3V, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 380VRMS 690 mA
Run Current Ripple Voltage IRIPPLE VIN = 3.3V, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 380VRMS 400 mVpp
Efficiency η VIN = 3.3V, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 380VRMS 75 %
³ The BRITE minimum input voltage level is 0V, whereas it is 0.65V in the original LXMG1618-03-2x inverter.
FUNCTIONAL PIN DESCRIPTION
CONN PIN DESCRIPTION
CN1 (Molex 53261-0871 or equivalent) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable
assembly
CN1-1
CN1-2 VIN Main Input Power Supply (3V < VIN < 3.6V)
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 (0V to 2.0V). 2.0V gives maximum lamp current.
CN1-7 SET1 SET1 MSB Connecting this pin to ground decreases the output current ~ 1mA (see Table 1)
CN1-8 SET2 SET2 LSB Connecting this pin to ground decreases the output current ~ 0.5mA (see Table 1)
CN2 for LXMG1618A-03-21 and -22 (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) or equivalent
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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P
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D
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ASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2008
Rev. 1.1, 2009-11-03
WWW.Microsemi .COM
PanelMatch
™
"A Series" LXMG1618A-03-2x
3.3V 2.2W CCFL Programmable Inverter Module
TM ®
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 7) SET2
(Pin 8) Nominal Output Current
Open Open 5.0mA
Open Ground 4.5mA
Ground Open 4.0mA
Ground Ground 3.5mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXMG1618A-03-2X
0.8mm ±0.1
0.0315in.
Weight: (5.7g) typ.
4.7mm Max
0.185in.
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
GROUNDED MOUNTING
HOLE 2.44MM ±0.08 DIA.
MOUNTING HOLE
2.44MM ±0.08
DIA.
60mm ±0.2mm
2.36in.
9mm ±0.2mm
0.354 in.
R1.0
Warning
High Voltage is present at high
side of trans former, its core
and the high sid e of the output
connector, please provide at
least 2 mm clearance (in all
directions) on the component
side of the board to any
conductor when mounting
All dimensions in millimeters, inches are for reference only.
SIMPLIFIED BLOCK DIAGRAM
Controller &
Transformer
Driver
0 to 2V
DC
LAMP
VLO
VHI
VBRITE
SET 1
High
Voltage
Transformer
ISENSE
OVSENSE
SET 2
+3V
267k
10k
+3V
+3V
VIN
OC SENSE
10k
71.5k
220nF
P
PA
AC
CK
KA
AG
GE
E
D
DA
AT
TA
A
P
RODUCTION
D
AT
ASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2008
Rev. 1.1, 2009-11-03
WWW.Microsemi .COM
PanelMatch
™
"A Series" LXMG1618A-03-2x
3.3V 2.2W CCFL Programmable Inverter Module
TM ®
TYPICAL APPLICATION
LXMG1618A-03-2x
3.3V
SET2GND
VHI
VLO
BRITE VIN
SLEEP
SET1
0V to
2.0V 500k
DAC or
Pot
CCFL
TUBE
NC NC
Figure 1 – Brightness Control
(Output current set to maximum)
P.W.
10µs to 500µS
BRITE
LXMG1618A-03-2x
0 < P.W. < 100% of period
PWM Signal
from System
Figure 1A – PWM Brightness Control
LXMG1618A-03-2x
SET2GND
VHI
VLO
SLEEP
SET1
CCFL
TUBE
BRITE
3.3V
VIN
L L 3.5mARMS
L H 4.0mARMS
H L 4.5mARMS
H H 5.0mARMS
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 500K manual pot.
The inverter contains effectively an internal 338k pull-up
to 3V to bias the pot, if desired; add a resistor to set the
lower threshold voltage above the absolute minimum dim
level capability. A PWM logic level signal (figure 1A)
may be used up to 5V; however the inverter will reach
maximum current at less than 100% duty cycle. This can
be calculated as approximately 2V divided by the logic
high voltage level; with 3.3V logic level this corresponds
to about 60% duty cycle for maximum lamp current.
• 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 manufacturers. Generally the best
lamp lifetime correlates with driving the CCFL at the
manufacturer’s 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 an
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 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 user’s 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 up to about one
second, after which (without success) the inverter will
shutdown. Supply current draw in the shutdown mode is
about 8mA. In order to restart the inverter it is necessary
to toggle the sleep input or cycle the VIN input supply.
A
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ON
N
P
RODUCTION
D
AT
ASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2008
Rev. 1.1, 2009-11-03
WWW.Microsemi .COM
PanelMatch
™
"A Series" LXMG1618A-03-2x
3.3V 2.2W 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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