PanelMatch I N T E G R A T E D LXM1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P R O D U C T S P RELIMINARY D ATASHEET KEY FEATURES DESCRIPTION APPLICATIONS WWW . Microsemi .C OM 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 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. The LXM1624-12-4x 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. LXM1624 modules unlike the LXM1623 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. 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 PRODUCT HIGHLIGHT U N IV E R S A L "P W M ", V DC Voltage Source DC , D IN P U T IM M IN G OR P O T E N T IO M E T E R Potentiom eter PW M Signal W 3 1 2 2 1 3 ELECTABLE M A X IM U M TO O UTPUT 6 .5 M A C URRENT LXM1624-12-4X S W 5MA RM S PACKAGE ORDER INFO Copyright 2002 Rev. 0.2a, 2003-01-20 PART NUMBER OUTPUT CONNECTOR LXM1624-12-41 LXM1624-12-42 LXM1624-12-43 JST SM02(8.0)B-BHS-1-TB JST SM02B-BHSS-1-TB Honda QZ-19-A3MYL #02 INVERTER MATES DIRECTLY TO PANEL CONNECTORS JST BHR-03VS-1 JST BHSR-02VS-1 HONDA QZ-19-3F01 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 PanelMatch I N T E G R A T E D LXM1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P R O D U C T S P RELIMINARY D ATASHEET 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 Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 25°C except where otherwise noted. Parameter ` Symbol Test Conditions LXM1624-12-4x 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 2002 Rev. 0.2a, 2003-01-20 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 I N T E G R A T E D P R O D U C T S LXM1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P RELIMINARY D ATASHEET 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 ` LXM1624-12-4x 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 25°C except where otherwise noted. 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 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501 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 ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON CN1-6 BRITE Brightness Control (0.65V to 2.0VDC). 2.0VDC gives maximum lamp current. 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) 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 CN2, CN3 for LXM1624-12-43 (Honda QZ-19-A3MYL #02) CN2-3 CN3-3 VHI High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. CN2-1 CN3-1 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground Copyright 2002 Rev. 0.2a, 2003-01-20 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 ELECTRICALS CN2, CN3 for LXM1624-12-41 and -42 (JST SM02(8.0)B-BHS-1-TB or SM02B-BHSS-1-TB) PanelMatch I N T E G R A T E D LXM1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P R O D U C T S P RELIMINARY 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 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 LXM1624-12-4X 4.52in 115mm 4.29in 26mm CN-3 W 0.15in. 4mm 0.23in 0.0392in. 6mm 1.0mm Weight: (15g) typ. PCB tolerances ± 0.5mm 1 W -03 1 3 Honda QZ-19-A3MYL #02 1.02in. 30mm -02 SM02B-BHSS-1-TB (JST) -01 CN-2 1.18in. SM02(8.0)B-BHS-1-TB (JST) G ROUNDED M OUNTING HOLE 3MM X 2 DIA. ±0.08 6MM SCREW HEAD CLEARANCE 109mm Warning High Voltage 0.256in. Present at high 6.5mm Max side of transformer and Output Connector SIMPLIFIED BLOCK DIAGRAM High Voltage Transform er 10K V BRIT E +3V V IN1 OC SENSE 10K PACKAGE DATA Controller and Transform er Driver 0.65 2V DC V HI LAMP +3V SET 1 +3V SET 2 Copyright 2002 Rev. 0.2a, 2003-01-20 OV SENSE 10K I SENSE V LO O ne of Two Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 PanelMatch I N T E G R A T E D P R O D U C T S LXM1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P RELIMINARY D ATASHEET 12V DAC or Pot V IN1 BRITE 20K V HI LXM1624-12-4x Rx* SLEEP SET 1 SET 2 CCFL TUBE GND V LO ONE OF TW O 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) PW M Signal from System BRITE LXM1624-12-4x 26% > P.W. < 100% of period Figure 1A – PWM Brightness Control 12V V HI CCFL TUBE LXM1624-12-4x SLEEP SET 2 GND V LO ONE OF TW O 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 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 2002 Rev. 0.2a, 2003-01-20 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 APPLICATION SET 1 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. 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. 10us to 125uS V IN1 If you need to turn the inverter ON/OFF remotely, connect to TTL logic signal to the SLEEP input. 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. P.W . BRITE 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. WWW . Microsemi .C OM TYPICAL APPLICATION PanelMatch I N T E G R A T E D P R O D U C T S LXM1624-12-4x 12V Dual 4W CCFL Programmable Inverter Module P RELIMINARY D ATASHEET WWW . Microsemi .C OM NOTES NOTES Preliminary Data – Information contained in this document is pre-production data and is proprietary to Microsemi. It may not be modified in any way without the express written consent of Microsemi. Product referred to herein is offered in sample form only and Microsemi reserves the right to change or discontinue this proposed product at any time. Copyright 2002 Rev. 0.2a, 2003-01-20 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6