PanelMatch™ 12V Dual 4W CCFL Programmable Inverter Module ® TM LXMG1624-12-4x P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION 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. 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/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 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 -20 to 70°C UL60950 E175910 RoHS Compliant WWW . Microsemi .C OM The LXMG1624-12-4x is a Dual 4W Output Direct Drive™ CCFL (Cold Cathode Fluorescent Lamp) Inverter Module specifically designed for driving LCD backlight lamps. It is ideal for driving typical 6.4” to 10.4” TFT panels. The modules are available with a dimming input that permits brightness control from either a DC voltage source or a PWM signal or external Potentiometer. 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. LXMG1624 modules unlike the LXMG1623 series does not provide wide range ‘burst’ mode dimming, rather dimming is provided by amplitude control of the output current waveform, this limits the potential dim range to typically less than 5:1. 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 Panels specifications Output Open Circuit Voltage Regulation Minimizes Corona Discharge For High Reliability PRODUCT HIGHLIGHT UNIVERSAL DIMMING INPUT "PWM", VDC, OR POTENTIOMETER DC Voltage Source Potentiometer PWM Signal 3 W 1 3 LXMG1624-12-4X 2 2 1 W SELECTABLE MAXIMUM OUTPUT CURRENT 5MA TO 6.5MA RMS PACKAGE ORDER INFO PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO PANEL CONNECTORS LXMG1624-12-41 LXMG1624-12-42 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 JST BHR-03VS-1 JST BHSR-02VS-1 Copyright © 2005 Rev. 1.1, 2006-11-16 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 PanelMatch™ 12V Dual 4W CCFL Programmable Inverter Module ® TM LXMG1624-12-4x P RODUCTION D ATA S HEET Input Signal Voltage (VIN1).....................................................................................................................................-0.3V to 15V Input Power ....................................................................................................................................................................... 10W Output Voltage, no load ............................................................................................................ Internally Limited to 1500VRMS Output Current ............................................................................................................................7.5mARMS (Internally Limited) Output Power (each output) ............................................................................................................................................. 4.0W Input Signal Voltage ( SLEEP Input) ...................................................................................................................... -0.3V to VIN1 Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V Ambient Operating Temperature, zero airflow.....................................................................................................-20°C to 70°C Operating Relative Humidity, non-condensing ................................................................................................................ ≤ 90% 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. WWW . Microsemi .C OM ABSOLUTE MAXIMUM RATINGS (NOTE 1) 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. Parameter Symbol Input Supply Voltage Range (Fully Regulated Lamp Current) Input Supply Voltage Range (Functional) Output Power (each output) Linear BRITE Control Input Voltage Range¹ Lamp Operating Voltage Lamp Current (Full Brightness) Operating Ambient Temperature Range VIN1 PO VBRT_ADJ VLAMP IOLAMP TA Recommended Operating Conditions Min R.C. Max 10.8 12 13.2 10.2 12 3.5 13.8 4.0 2.0 530 6.5 70 0.65 to 0.9 350 5 -20 440 Units V W V VRMS mARMS °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 ELECTRICAL CHARACTERISTICS The following specifications apply over the recommended operating condition and ambient temperature of 25°C except where otherwise noted. Parameter ` Symbol Test Conditions LXMG1624-12-4x Min Typ Max Units OUTPUT PIN CHARACTERISTICS IL(MAX) Full Bright Lamp Current (each output) IL(MAX) Full Bright Lamp Current (each output) IL(MAX) Full Bright Lamp Current (each output) IL(MAX) Output Current Lamp to Lamp Deviation ILL%DEV Min. Average Lamp Current (each output) Lamp Start Voltage IL(MIN) VLS VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC ISET1 = Ground, ISET2 = Ground VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC ISET1 = Ground, ISET2 = Open VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC ISET1 = Open, ISET2 = Ground VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC ISET1 = Open, ISET2 = Open VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC ISET1 = Open, ISET2 = Open VBRT_ADJ =0.65VDC, SLEEP > 2.0V, VIN1 = 12VDC ISET1 = ISET2 = Ground -20°C < TA < 70°C, VIN1 > 10.8VDC 4.5 5 5.5 mARMS 5.0 5.5 6.0 mARMS 5.5 6 6.5 mARMS 6.0 6.5 7.0 mARMS 3 10 % 1250 2² mARMS 1400 VRMS Operating Frequency fO 76 80 83 kHz VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 12V ² 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. Copyright © 2005 Rev. 1.1, 2006-11-16 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 ELECTRICALS Full Bright Lamp Current (each output) PanelMatch™ ® TM LXMG1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P RODUCTION D ATA S HEET The following specifications apply over the recommended operating condition and ambient temperature of 25°C except where otherwise noted. Parameter ` Symbol IBRT Minimum Input for Max. Lamp Current Minimum Input for Min. Lamp Current ` Units VBRT_ADJ VBRT_ADJ VBRT_ADJ = 0VDC VBRT_ADJ = 3VDC IO(LAMP) = Maximum Lamp Current IO(LAMP) = Minimum Lamp Current -300 50 2.0 2.05 0.65* µADC µADC VDC VDC SLEEP INPUT RUN Mode VSLEEP 2.0 VIN1 VDC SLEEP Mode VSLEEP -0.3 0.8 VDC 0.4 V µA 50 µADC SET1,2 INPUT SET1,2 Low Threshold Input Current ` LXMG1624-12-4x Min Typ Max BRITE INPUT Input Current ` Test Conditions WWW . Microsemi .C OM ELECTRICAL CHARACTERISTICS (CONTINUED) VL ISET VSET ≤ 0.4V -300 POWER CHARACTERISTICS Sleep Current IIN(MIN) Run Current IIN(RUN) η Efficiency VIN1 = 12VDC, SLEEP < 0.8V 0.0 VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 440VRMS VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 440VRMS 10 530 mADC 85 % * 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 CN1-3 CN1-4 VIN1 Main Input Power Supply (10.8V < VIN1 < 13.2V) GND 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 (0.65V to 2.0VDC). 2.0VDC 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 © 2005 Rev. 1.1, 2006-11-16 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 ELECTRICALS CN2, CN3 for LXMG1624-12-41 and -42 (JST SM02(8.0)B-BHS-1-TB(LF)(SN), Yeon Ho 20015WR-05A00 or SM02B-BHSS1-TB(LF)(SN), Yeon Ho 35001WR-02A00) PanelMatch™ 12V Dual 4W CCFL Programmable Inverter Module ® TM LXMG1624-12-4x P RODUCTION D ATA S HEET 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 6.5mA 6.0mA 5.5mA 5.0mA * If driven by a logic signal it should be open collector or open drain only, not a voltage source. PHYSICAL DIMENSIONS LXMG1624-12-4X 115mm 4.53in. 109mm GROUNDED MOUNTING HOLE 4.29in. 3MM X 2 DIA. ±0.08 6MM SCREW HEAD CLEARANCE CN1 22mm CN2 30mm 0.866in. 26mm 1.18in. 1.02in. CN3 4mm 0.157in. 103mm ±0.2mm 6mm 4.055in. 1.0mm 0.23in. 0.0394in. Weight: (15g) typ. PCB tolerances ± 0.5mm Warning High Voltage 6.5mm Max Present at high 0.256in. side of transformer and Output Connector Dimensions are in millimeters (inches are for reference only) SIMPLIFIED BLOCK DIAGRAM High Voltage Transformer 10K V BRITE +3V V IN1 OC SENSE 10K PACKAGE DATA Controller and Transformer Driver 0.65 2V DC V HI LAMP +3V SET 1 +3V SET 2 Copyright © 2005 Rev. 1.1, 2006-11-16 OV SENSE 10K I SENSE V LO One of Two Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 PanelMatch™ ® TM LXMG1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P RODUCTION D ATA S HEET 12V DAC or Pot 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 to 3.9K 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 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 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 users 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 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 VIN1 BRITE 20K VHI LXMG1624-12-4x Rx* SLEEP SET1 SET2 GND CCFL TUBE VLO ONE OF TWO NC NC *Set Rx from 2.7K to 3.9K depending on panel minimum lamp current requirements Figure 1 – Brightness Control (Output current set to maximum) PWM Signal from System BRITE P.W. LXMG1624-12-4x 10us to 125uS 26% > P.W. < 100% of period Figure 1A – PWM Brightness Control 12V BRITE VIN1 VHI CCFL TUBE LXMG1624-12-4x SLEEP SET1 SET2 GND VLO ONE OF TWO L L H H L 5.0mARMS H 5.5mARMS L 6.0mARMS H 6.5mARMS L=GND; H=Open Figure 2 – Maximum Output Current (SET1 and SET2 Inputs) Copyright © 2005 Rev. 1.1, 2006-11-16 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 APPLICATIONS WWW . Microsemi .C OM TYPICAL APPLICATION PanelMatch™ TM ® LXMG1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P RODUCTION D ATA S HEET 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 © 2005 Rev. 1.1, 2006-11-16 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6