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PanelMatchTM
TM (R)
LXMG1628-12-6x
12V Dual 6W Programmable CCFL Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
KEY FEATURES
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The LXMG1628-12-6x is a Dual 6W Output Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Module specifically designed for driving LCD backlight lamps. It is ideal for driving typical 10.4" to 15" TFT panels. The LXMG1628 modules are available with a dimming input that permits brightness control from a DC voltage source, a PWM signal, or external potentiometer. The maximum output current is externally programmable over a range of 5mA to 8mA in 1mA steps to allow the inverter to properly match to a wide array of LCD panel lamp current specifications. LXMG1628 modules unlike the LXMG1627 series does 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 3:1. For applications not requiring wide range dimming, current
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 the DC voltage from the system battery or AC adapter directly to the high frequency, highvoltage waves required to ignite and operate CCFL lamps. A 5V input wide dimming inverter is also available (LXMG1627-05-6x), as well as a 4W version (LXMG1628-12-4x) for driving smaller lower power/voltage panels. The inverter's design is based on Microsemi's newer 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 short protection with fault timeout.
Externally Programmable Maximum Output Current Easy to Use Brightness Control
Analog Current Amplitude Dimming Method
Output Open/Short-Circuit Protection and Automatic StrikeVoltage Regulation and Timeout Fixed Frequency Operation Rated From -30C to 80C UL60950 E175910 Pending RoHS Compliant APPLICATIONS High Brightness Displays Portable Instrumentation Desktop Displays Industrial Display Controls
BENEFITS
Compact, Low Profile Design 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; 5,930,121; 6,198,234; Patents Pending
PRODUCT HIGHLIGHT
"PWM", VDC, or POTENTIOMETER
UNIVERSAL DIMMING INPUT
DC Voltage Source
Potentiometer
PWM Signal
3
1
2
2
LXMG1628-12-6x LXMG1628-12-6x
1
3
SELECTABLE MAXIMUM OUTPUT CURRENT 5mARMS TO 8mARMS
PACKAGE ORDER INFO PART NUMBER LXMG1628-12-61 LXMG1628-12-62
Copyright (c) 2008 Rev. 1.0, 2008-12-03
OUTPUT CONNECTOR JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00 JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00
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, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 1
PanelMatchTM
TM (R)
LXMG1628-12-6x
12V Dual 6W Programmable CCFL Inverter Module
PRODUCTION DATASHEET
ABSOLUTE MAXIMUM RATINGS Input Signal Voltage (VIN) ......................................................................................................................................-0.3V to 15V Input Power ....................................................................................................................................................................... 15W Output Voltage, no load ............................................................................................................ Internally Limited to 1800VRMS Output Current ............................................................................................................................9.5mARMS (Internally Limited) Output Power (each output) ............................................................................................................................................. 6.0W 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 Operating Relative Humidity, non-condensing ................................................................................................................ 90% 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 (each output) Linear BRITE Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness) Operating Ambient Temperature Range Symbol VIN PO VBRT_ADJ VLAMP IOLAMP TA Recommended Operating Conditions Min R.C. Max 10.8 10.2 0 480 5 -30 12 12 5.5 600 13.2 13.8 6.0 2 720 8 80 Units V W V VRMS mARMS C
ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 0C to 60C except where otherwise noted; BRITE 2V, SLEEP > 2.0V, VIN = 12V. Parameter
OUTPUT PIN CHARACTERISTICS Full Bright Lamp Current (each output) Full Bright Lamp Current (each output) Full Bright Lamp Current (each output) Full Bright Lamp Current (each output) Output Current Lamp to Lamp Deviation Min. Average Lamp Current (each output) Lamp Start Voltage Operating Frequency IL(MAX) IL(MAX) IL(MAX) IL(MAX) ILL%DEV IL(MIN) VLS fO SET1 = Ground, SET2 = Ground SET1 = Ground, SET2 = Open SET1 = Open, SET2 = Ground SET1 = Open, SET2 = Open SET1 = Open, SET2 = Open BRITE = 0V, SET1 = SET2 = Ground -30C < TA < 80C, VIN > 10.8V 1500 47 4.4 5.4 6.4 7.4 5 6 7 8 3 2.5 1650 50 53 5.6 6.6 7.6 8.6 10 mARMS mARMS mARMS mARMS % mARMS VRMS kHz
Symbol
Test Conditions
LXMG1628-12-6x Min Typ Max
Units
ELECTRICALS ELECTRICALS
Copyright (c) 2008 Rev. 1.0, 2008-12-03
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 2
PanelMatchTM
TM (R)
LXMG1628-12-6x
12V Dual 6W Programmable CCFL Inverter Module
PRODUCTION DATASHEET
ELECTRICAL CHARACTERISTICS (CONTINUED) Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 0C to 60C except where otherwise noted; BRITE 2V, SLEEP > 2.0V, VIN = 12V. Parameter
BRITE INPUT Input Current Minimum Input for Max. Lamp Current Maximum Input for Min. Lamp Current Minimum PWM Input Frequency SLEEP INPUT RUN Mode SLEEP Mode SET1,2 INPUT SET1,2 Low Threshold Input Current POWER CHARACTERISTICS Sleep Current Run Current Strike (Open Lamps) Supply Current After Fault Timeout Efficiency IIN(MIN) IIN(RUN) TS_DWELL IFAULT Fault Timeout SET1 = Open, SET2 = Ground, VLAMP = 600VRMS VL ISET 0 SETx = 0V -300 1 875 1.0 20 0.4 V A A mA Sec mA % IBRT VBRT_ADJ VBRT_ADJ FBRT_PWM BRITE= 0V BRITE= 3V IO(LAMP) = Maximum Lamp Current IO(LAMP) = Minimum Lamp Current %BRITE_PWM < 50% (Visual Artifact Avoidance) -11 -1 1.9 A A V V kHz V V
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Symbol
Test Conditions
LXMG1628-12-6x Min Typ Max
Units
2.0 0
2
2.0 0 VIN 0.8
VSLEEP VSLEEP
SLEEP < 0.8V
SET1 = Open, SET2 = Ground, VLAMP = 600VRMS
1.5 8
82
FUNCTIONAL PIN DESCRIPTION CONN CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 PIN DESCRIPTION CN1 (Molex 53261-0871) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable assembly VIN GND Main Input Power Supply (10.8V < VIN < 13.2V) Power Supply Return ON/OFF Control. (0V SLEEP 0.8 = OFF, SLEEP 2.0V = ON Brightness Control (0V to 2V). 2V 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)
SLEEP
BRITE SET1 SET2
ELECTRICALS ELECTRICALS
CN2, CN3 for LXMG1628-12-61 and -62 (JST SM02(8.0)B-BHS-1-TB(LF)(SN) | Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB(LF)(SN) | Yeon Ho 35001WR02A00) CN2-1 CN3-1 CN2-2 CN3-2 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
Copyright (c) 2008 Rev. 1.0, 2008-12-03
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 3
PanelMatchTM
TM (R)
LXMG1628-12-6x
12V Dual 6W Programmable CCFL Inverter Module
PRODUCTION DATASHEET
TABLE 1 OUTPUT CURRENT SETTINGS SET1 (Pin 7) Open* Open* Ground Ground SET2 (Pin 8) Open* Ground Open* Ground Nominal Output Current 8.0mA 7.0mA 6.0mA 5.0mA PHYSICAL DIMENSIONS LXMG1628-12-6x
GROUNDED MOUNTING HOLE 3MM .08 DIA. 6MM HEAD CLEARANCE BOTH HOLES
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* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
165mm 151mm
5.945 in. 6.496 in.
3mm
.118 in
MOUNTING HOLE 3.06MM .08 DIA.
CN2
21mm
0.827in
CN1
18mm
.708 in.
CN3
14mm
.551 in
1mm 0.1
0.0395 in.
137mm 0.2
5.394 in.
10mm Max
0.394in.
Warning High Voltage is present at high side of each transformer, its core and the high side of the output connector pins, please provide at least 3 mm clearance (in all directions) on the component side of the board to any conductor when mounting
weight: 22g typ.
PCB tolerances 0.5mm , 4-40 recommended mounting screws
Dimensions are in millimeters (inches for reference only)
SIMPLIFIED BLOCK DIAGRAM
+3V Controller 232k BRITE 46.4k
High Voltage Transformer
VIN
VHI
Transformer Driver
LAMP
PACKAGE DATA PACKAGE DATA
+3V 10k SET1 +3V 10k
OVSENSE ISENSE
One of two VLO
SET2
Copyright (c) 2008 Rev. 1.0, 2008-12-03
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 4
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LXMG1628-12-6x
12V Dual 6W Programmable CCFL Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
Voltage Source, DAC, or Potentiometer 0V to 2V 500k LXMG1628-12-6x 12V VIN VHI
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BRITE
CCFL TUBE
The brightness control may be a voltage output DAC or other voltage source, a digital pot or 500k manual potentiometer. The inverter contains an internal 278k pullup to 3V to provide bias for the pot. 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 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. 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 user's responsibility since not all lamps are designed to be overdriven. The inverter has a built in fault timeout function. If either or both outputs are open (lamp disconnected or broken) the inverter will attempt to strike for about a 1.5 seconds and then shutdown for safety purposes. In order to restart the inverter it is necessary to toggle the sleep input or cycle the VIN input supply.
SLEEP SET1 NC
VLO SET2 NC GND ONE OF TWO
Figure 1 - Brightness Control (Output current set to maximum)
PWM Signal from System P.W. LXMG1628-12-6x 10s to 500S 0 < P.W. < 100% of period BRITE
Figure 1A - PWM Brightness Control
12V BRITE VIN VHI CCFL TUBE VLO ONE OF TWO
LXMG1628-12-6x SLEEP SET1 SET2 GND
APPLICATIONS APPLICATIONS
L 5.0mARMS H 6.0mARMS L 7.0mARMS H 8.0mARMS L=GND; H=Open Figure 2 - Maximum Output Current (SET1 and SET2 Inputs)
Copyright (c) 2008 Rev. 1.0, 2008-12-03
L L H H
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 5
PanelMatchTM
TM (R)
LXMG1628-12-6x
12V Dual 6W Programmable CCFL Inverter Module
PRODUCTION DATASHEET
NOTES
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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) 2008 Rev. 1.0, 2008-12-03
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
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