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PanelMatchTM "A Series"
TM (R)
LXMG1618A-12-4x
12V 4W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
KEY FEATURES
WWW .Microsemi .C OM
The LXMG1618A-12-4xTM is a Single Output 4W Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Module designed for driving LCD backlight lamps. It is ideal for driving typically 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 (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-05-4x). The LXMG1618A modules contain the newer highly integrated LX1691B CCFL backlight controller IC to provide a wider temperature range (-30C to 80C) 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.
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 -30C to 80C UL60950 E175910 RoHS Compliant APPLICATIONS
Medical Instrument Displays Portable Instrumentation 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
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
Protected By U.S. Patents: 5,923,129; 59320,121; 6,198,234; Patents Pending
PRODUCT HIGHLIGHT
UNIVERSAL DIMMING INPUT
"PWM", VDC,
OR
POTENTIOMETER
DC Voltage Source
Potentiometer
PWM Signal
3
LXMG1618A-12-4X
SELECTABLE MAXIMUM OUPUT CURRENT 5MARMS TO 6.5MARMS
PACKAGE ORDER INFO
1
2
PART NUMBER
LXMG1618A-12-41 LXMG1618A-12-42 Copyright (c) 2007 Rev. 1.1, 2009-11-03
OUTPUT CONNECTOR
JST SM02(8.0)B-BHS-1-TB (LF)(SN), Yeon Ho 20015WR-05A00 or equivalent JST SM02B-BHSS-1-TB (LF)(SN), Yeon Ho 35001WR-02A00 or equivalent
INVERTER MATES DIRECTLY TO PANEL CONNECTORS
JST BHR-03VS-1 JST BHSR-02VS-1
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 1
PanelMatchTM "A Series"
TM (R)
LXMG1618A-12-4x
12V 4W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
ABSOLUTE MAXIMUM RATINGS Input Signal Voltage (VIN) ......................................................................................................................................-0.3V to 15V 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 VIN Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V Ambient Operating Temperature, zero airflow.....................................................................................................-30C to 80C Storage Temperature Range...............................................................................................................................-40C to 85C
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.
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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. Parameter Input Supply Voltage Range (Fully Regulated Lamp Current) Input Supply Voltage Range (Functional) Output Power Linear BRITE Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness) Operating Ambient Temperature Range Symbol VIN PO VBRT_ADJ VLAMP IO(LAMP) TA Recommended Operating Conditions Min R.C. Max 10.8 10.2 0 465 5 -30 12 12 3.5 550 13.2 13.8 4.0 2.0 635* 6.5 80 Units V W V VRMS mARMS C
The BRITE minimum input voltage level is 0V, whereas it is 0.65V in the original LXMG1618-12-4x 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 requirement it can vary from 0V to 0.5V
* Total output power must not exceed 4W. Higher voltage lamps may require maximum output current to be set lower than 6.5mARMS
ELECTRICAL CHARACTERISTICS The following specifications apply over the recommended operating condition and ambient temperature of 0C to 60C except where otherwise noted. Parameter
OUTPUT PIN CHARACTERISTICS Full Bright Lamp Current Full Bright Lamp Current Full Bright Lamp Current Full Bright Lamp Current Min. Average Lamp Current Lamp Start Voltage Operating Frequency IL(MAX) IL(MAX) IL(MAX) IL(MAX) IL(MIN) VLS fO VBRT_ADJ 2.0V, SLEEP 2.0V, VIN = 12V ISET1 = Ground, ISET2 = Ground VBRT_ADJ 2.0V, SLEEP 2.0V, VIN = 12V ISET1 = Ground, ISET2 = Open VBRT_ADJ 2.0V, SLEEP 2.0V, VIN = 12V ISET1 = Open, ISET2 = Ground VBRT_ADJ 2.0V, SLEEP 2.0V, VIN = 12V ISET1 = Open, ISET2 = Open VBRT_ADJ = 0V, SLEEP 2.0V, VIN = 12V ISET1 = ISET2 = Gnd -30C < TA < 80C, VIN > 10.8V VBRT_ADJ = 2.0V, SLEEP 2.0V, VIN = 12V 4.5 5.0 5.5 6.0 5 5.5 6 6.5 1.6 1300 76 1400 80 83 5.5 6.0 6.5 7.0 mARMS
Symbol
Test Conditions
LXMG1618A-12-4x Min Typ Max
Units
ELECTRICALS ELECTRICALS
mARMS mARMS mARMS mARMS VRMS kHz
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 lamp current.
Copyright (c) 2007 Rev. 1.1, 2009-11-03
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 2
PanelMatchTM "A Series"
TM (R)
LXMG1618A-12-4x
12V 4W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
ELECTRICAL CHARACTERISTICS (CONTINUED) The following specifications apply over the recommended operating condition and ambient temperature of 0C to 60C except where otherwise noted. Parameter
BRITE INPUT Input Current Minimum Input for Max. Lamp Current Maximum Input for Min. Lamp Current Minimum PWM Input Frequency SLEEP BAR INPUT RUN Mode SLEEP Mode SET1,2 INPUT SET1,2 Low Threshold Input Current POWER CHARACTERISTICS Sleep Current Run Current Run Current Ripple Voltage Typical Efficiency IIN(MIN) IRUN IRIPPLE VIN = 12V, SLEEP 0.8V VIN = 12V, SLEEP 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 550VRMS VIN = 12V, SLEEP 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 550VRMS VIN = 12V, SLEEP 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 550VRMS 5 343 330 85 20 A mA mVpp % VL ISET VSET = 0V 0 -270 V A IBRT VBRT_ADJ VBRT_ADJ FBRT_PWM VBRT_ADJ = 0V VBRT_ADJ = 3V IO(LAMP) = Maximum Lamp Current IO(LAMP) = Minimum Lamp Current 0 2 -9 0 1.8 2.0 A A V V kHz
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Symbol
Test Conditions
LXMG1618A-12-4x Min Typ Max
Units
VSLEEP
2.0 -0.3 0.8
V V
VSLEEP
The BRITE minimum input voltage level is 0V, whereas it is 0.65V in the original LXMG1618-12-4x 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 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 VIN GND Main Input Power Supply (10.8V < VIN < 13.2V) Power Supply Return ON/OFF Control. (0V < SLEEP 0.8V = OFF, SLEEP 2.0V = ON) Brightness Control (0V to 2.0V). 2.0V gives maximum lamp current. SET1 MSB Connecting this pin to ground decreases the output current (see Table 1) SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)
Yeon Ho 35001WR-02A00) or equivalent
SLEEP
BRITE SET1 SET2
ELECTRICALS ELECTRICALS
CN2 for LXMG1618A-12-41 and -42 (JST SM02(8.0)B-BHS-1-TB(LF)(SN) ; Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB(LF)(SN) ; CN2-1 CN2-2
Copyright (c) 2007 Rev. 1.1, 2009-11-03
VHI VLO
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 3
PanelMatchTM "A Series"
TM (R)
LXMG1618A-12-4x
12V 4W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TABLE 1 SETTING OUTPUT CURRENT OUTPUT CURRENT SETTINGS SET1 (Pin 7) Open* Open* Ground Ground SET2 (Pin 8) Open* Ground Open* Ground Nominal Output Current 6.5mA 6.0mA 5.5mA 5.0mA
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* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS LXMG1618A-12-4X
86mm 71mm
2.80in. 3.39in. MOUNTING HOLE 2.44MM 0.08 DIA.
CN1 3.5mm
0.138in.
16mm
0.63in.
9mm 0.2mm
0.354in.
12.5mm
0.492in.
CN2
11mm
0.433in.
GROUNDED MOUNTING HOLE 2.44MM 0.08 DIA.
60mm 0.2mm
2.36in.
0.8mm 0.1mm
0.0315in. 0.244in.
6.2mm Max
Warning High Voltage is present at high side of transformer, its core and the high side 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
R1.0
Weight: (6g) typ.
PCB tolerances 0.5mm, M2 or 2-56 recommended mounting screws
All dimensions are in millimeters, inches are for reference only
SIMPLIFIED BLOCK DIAGRAM
+3V 267k
V BRITE 0 to 2V 71.5k 220nF
High Voltage Transformer Controller & Transformer Driver
V IN
V
HI
DC
PACKAGE DATA PACKAGE DATA
+3V 10k SET 1
OC SENSE
+3V 10k
OVSENSE ISENSE
V
LO
SET 2
Copyright (c) 2007 Rev. 1.1, 2009-11-03
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
LAMP
Page 4
PanelMatchTM "A Series"
TM (R)
LXMG1618A-12-4x
12V 4W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
WWW .Microsemi .C OM
12V DAC or Pot 0V to 2.0V BRITE VIN
500k
VHI LXMG1618A-12-4x CCFL TUBE
SLEEP SET1 SET2 NC NC
GND
VLO
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 10mA. In order to restart the inverter it is necessary to toggle the sleep input or cycle the VIN input supply.
Figure 1 - Brightness Control (output current set to maximum)
PWM Signal from System P.W.
BRITE
LXMG1618A-12-4x 10s to 500S 0 < P.W. < 100% of period
Figure 1A - PWM Brightness Control
12V BRITE VIN VHI CCFL TUBE VLO
LXMG1618A-12-4x SLEEP SET1 SET2 GND
APPLICATION APPLICATION
L L H H
L 5.0mARMS H 5.5mARMS L 6.0mARMS H 6.5mARMS L=GND; H= Open
Figure 2 - Max Output Current (SET1 and SET2 Inputs)
Copyright (c) 2007 Rev. 1.1, 2009-11-03
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 5
PanelMatchTM "A Series"
TM (R)
LXMG1618A-12-4x
12V 4W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
NOTES
WWW .Microsemi .C OM
NOTES 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
Copyright (c) 2007 Rev. 1.1, 2009-11-03
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 6

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