PanelMatch™ ® TM LXMG1628-12-6x 12V Dual 6W Programmable CCFL Inverter Module P RODUCTION D ATASHEET KEY FEATURES DESCRIPTION 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. 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 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 -30°C to 80°C UL60950 E175910 Pending RoHS Compliant WWW . Microsemi .C OM The LXMG1628-12-6x is a Dual 6W Output Direct Drive™ 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 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 PRODUCT HIGHLIGHT UNIVERSAL DIMMING INPUT “PWM”, VDC, or POTENTIOMETER Potentiometer PWM Signal W W SELECTABLE MAXIMUM OUTPUT CURRENT 5mARMS TO 8mARMS PACKAGE ORDER INFO PART NUMBER LXMG1628-12-61 LXMG1628-12-62 Copyright © 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 LXMG1628-12-6x 3 1 2 2 1 3 DC Voltage Source PanelMatch™ ® TM LXMG1628-12-6x 12V Dual 6W Programmable CCFL Inverter Module P RODUCTION D ATASHEET 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.....................................................................................................-30°C to 80°C Operating Relative Humidity, non-condensing ................................................................................................................ ≤ 90% 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. WWW . Microsemi .C OM ABSOLUTE MAXIMUM RATINGS 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 Symbol 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 VIN PO VBRT_ADJ VLAMP IOLAMP TA Recommended Operating Conditions Min R.C. Max 10.8 12 13.2 10.2 12 5.5 13.8 6.0 2 720 8 80 0 480 5 -30 600 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 0°C to 60°C except where otherwise noted; BRITE ≥ 2V, SLEEP > 2.0V, VIN = 12V. Parameter ` Symbol Test Conditions LXMG1628-12-6x Min Typ Max Units OUTPUT PIN CHARACTERISTICS IL(MAX) SET1 = Ground, SET2 = Ground 4.4 5 5.6 mARMS Full Bright Lamp Current (each output) IL(MAX) SET1 = Ground, SET2 = Open 5.4 6 6.6 mARMS Full Bright Lamp Current (each output) IL(MAX) SET1 = Open, SET2 = Ground 6.4 7 7.6 mARMS Full Bright Lamp Current (each output) Output Current Lamp to Lamp Deviation Min. Average Lamp Current (each output) Lamp Start Voltage IL(MAX) SET1 = Open, SET2 = Open 7.4 8 8.6 mARMS ILL%DEV SET1 = Open, SET2 = Open 3 10 % Operating Frequency Copyright © 2008 Rev. 1.0, 2008-12-03 IL(MIN) VLS BRITE = 0V, SET1 = SET2 = Ground -30°C < TA < 80°C, VIN > 10.8V fO 2.5 1500 1650 47 50 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 mARMS VRMS 53 kHz Page 2 ELECTRICALS Full Bright Lamp Current (each output) PanelMatch™ ® TM LXMG1628-12-6x 12V Dual 6W Programmable CCFL Inverter Module P RODUCTION D ATASHEET Parameter ` Symbol IBRT Minimum Input for Max. Lamp Current Maximum Input for Min. Lamp Current Minimum PWM Input Frequency ` Units 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 2.0 0 2 µA µA V V kHz SLEEP INPUT RUN Mode VSLEEP 2.0 VIN V SLEEP Mode VSLEEP 0 0.8 V 0.4 V µA SET1,2 INPUT SET1,2 Low Threshold Input Current ` LXMG1628-12-6x Min Typ Max BRITE INPUT Input Current ` Test Conditions WWW . Microsemi .C OM ELECTRICAL CHARACTERISTICS (CONTINUED) Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 0°C to 60°C except where otherwise noted; BRITE ≥ 2V, SLEEP > 2.0V, VIN = 12V. VL ISET 0 SETx = 0V -300 POWER CHARACTERISTICS Sleep Current IIN(MIN) SLEEP < 0.8V Run Current IIN(RUN) SET1 = Open, SET2 = Ground, VLAMP = 600VRMS Strike (Open Lamps) IFAULT η 20 µA mA 1.5 Sec Fault Timeout 8 mA SET1 = Open, SET2 = Ground, VLAMP = 600VRMS 82 % TS_DWELL Supply Current After Fault Timeout Efficiency 1 875 1.0 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 CN1-3 CN1-4 VIN GND Main Input Power Supply (10.8V < VIN < 13.2V) Power Supply Return CN1-5 SLEEP CN1-6 BRITE 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) ON/OFF Control. (0V ≤ SLEEP ≤ 0.8 = OFF, SLEEP ≥ 2.0V = ON Brightness Control (0V to 2V). 2V gives maximum lamp current. 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 Copyright © 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 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) PanelMatch™ ® TM LXMG1628-12-6x 12V Dual 6W Programmable CCFL Inverter Module P RODUCTION D ATASHEET WWW . Microsemi .C OM 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 * If driven by a logic signal it should be open collector or open drain only, not a voltage source. PHYSICAL DIMENSIONS LXMG1628-12-6x GROUNDED MOUNTING HOLE 3MM ±.08 DIA. 6MM HEAD CLEARANCE BOTH HOLES 165mm 151mm 6.496 in. 5.945 in. 3mm .118 in MOUNTING HOLE 3.06MM ±.08 DIA. CN2 18mm CN1 21mm 14mm 1mm ± 0.1 .551 in CN3 .708 in. 0.827in 137mm ±0.2 5.394 in. 0.0395 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 High Voltage Transformer Controller 232k BRITE Transformer Driver VIN +3V PACKAGE DATA LAMP 46.4k VHI 10k SET1 SET2 +3V OVSENSE 10k ISENSE One of two Copyright © 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 VLO Page 4 PanelMatch™ ® TM LXMG1628-12-6x 12V Dual 6W Programmable CCFL Inverter Module P RODUCTION D ATASHEET Voltage Source, DAC, or Potentiometer 12V VIN BRITE VLO NC NC ONE OF TWO GND 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. Figure 1 – Brightness Control (Output current set to maximum) PWM Signal from System BRITE P.W. LXMG1628-12-6x 10µs to 500µS 0 < P.W. < 100% of period Figure 1A – PWM Brightness Control 12V VIN BRITE VHI CCFL TUBE LXMG1628-12-6x SLEEP SET1 SET2 GND VLO ONE OF TWO L L H H 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 © 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 5 APPLICATIONS CCFL TUBE LXMG1628-12-6x SET2 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. VHI 0V to 2V 500k SLEEP SET1 WWW . Microsemi .C OM TYPICAL APPLICATION PanelMatch™ TM ® LXMG1628-12-6x 12V Dual 6W Programmable CCFL Inverter Module P RODUCTION D ATASHEET 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 © 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 6