PanelMatch™ I N T E G R A T E D P R O D U C T S LXM1644-12-61 12V Quad 6W CCFL Programmable Inverter Module P RELIMINARY D ATASHEET 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 LXM1644-12-61 inverter is intended for panel assemblies where lamp pairs share close proximity with one another and a common return (low side) wire. 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 and a panel to inverter cross reference, consult MICROSEMI’s website: http://www.microsemi.com WWW . Microsemi .C OM The LXM1644-12-61 is a Quad 6W Output Direct Drive™ CCFL (Cold Cathode Fluorescent Lamp) Inverter Module specifically designed for driving LCD backlight lamps. It is ideal for driving typical 12.1” to 18.1” 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 10 to 16mA in 1mA steps to allow the inverter to properly match to a wide array of LCD panel lamp current specifications. LXM1644 modules unlike the LXM1643 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. Externally Programmable Maximum Output Current Easy to Use Brightness Control Analog Current Amplitude Dimming Method Output Open/Short-Circuit Protection and Timeout Fixed Frequency Operation Rated From -20 to 70°C UL 60950 E175910 APPLICATIONS High Brightness Displays 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 PRODUCT HIGHLIGHT Universal Dimming Input PWM, VDC, or DC Voltage Source Potentiometer PWM Signal " LXM1644-12-61 Selectable Maximum Output Current 10mA to 16mA RMS PACKAGE ORDER INFO Copyright 2002 Rev. 0.5a, 2003-01-20 ART NUMBER OUTPUT CONNECTORS LXM1644-12-61 Two JST SM04(4.0)B-BHS-1-TB INVERTER MATES DIRECTLY TO PANEL CONNECTORS JST BHR-04VS-1 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 LXM1644-12-61 12V Quad 6W 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 ....................................................................................................................................................................... 30W Output Voltage, no load ............................................................................................................ Internally Limited to 2000VRMS Output Current (each output) ......................................................................................................9.5mARMS (Internally Limited) Output Power (each output) ............................................................................................................................................. 6.0W 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 lamp) Linear BRITE Control Input Voltage Range¹ Lamp Operating Voltage Lamp Current (Each pair, 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 5.0 13.8 6.0* 2.0 720 16 70 0.65 to 0.9 530 10 -20 625 Units V W V VRMS mARMS °C *Total output power must not exceed 12W per lamp pair. Higher voltage lamps may require the maximum output current to be set lower 16mA 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 LXM1644-12-61 Min Typ Max Units OUTPUT PIN CHARACTERISTICS IL(MAX) Full Bright Lamp Current (two lamps) IL(MAX) Full Bright Lamp Current (two lamps) IL(MAX) Full Bright Lamp Current (two lamps) IL(MAX) Output Current pair of Lamps to pair of Lamps Deviation ILL%DEV Min. Average Lamp Current (each output) Lamp Start Voltage Operating Frequency IL(MIN) VLS fO 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 ≤0.5VDC, SLEEP > 2.0V, VIN1 = 12VDC ISET1 = ISET2 = Ground -20°C < TA < 70°C, VIN1 > 10.8VDC VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 12V 9 10 11 mARMS 10.8 12 13 mARMS 12.8 14 15 mARMS 14.7 16 17 mARMS 3 10 % 5.5² 1500 1650 69 72 mARMS VRMS 75 kHz 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. 0.5a, 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 (two lamps) PanelMatch™ I N T E G R A T E D P R O D U C T S LXM1644-12-61 12V Quad 6W CCFL Programmable Inverter Module P RELIMINARY D ATASHEET Parameter ` Symbol ` ` LXM1644-12-61 Min Typ Max Units -300 50 µADC µADC BRITE INPUT Input Current ` Test Conditions IBRT VBRT_ADJ = 0VDC VBRT_ADJ = 3VDC Minimum Input for Max. Lamp Current VBRT_ADJ IO(LAMP) = Maximum Lamp Current Minimum Input for Min. Lamp Current VBRT_ADJ IO(LAMP) = Minimum Lamp Current 2.0 2.05 0.65* VDC VDC SLEEP INPUT RUN Mode VSLEEP 2.0 VIN1 VDC SLEEP Mode VSLEEP -0.3 0.8 VDC 0.4 V 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. SET1,2 INPUT SET1,2 Low Threshold VL Input Current ISET VSET ≤ 0.4V -300 µA POWER CHARACTERISTICS Sleep Current IIN(MIN) Run Current IRUN η Efficiency VIN1 = 12VDC, SLEEP < 0.8V 0.0 VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 625VRMS VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 625VRMS 10 30 µADC 1750 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 53261-1290) Mates with 51021-1200 housing, 50079-8100 pins. Mates with LX9508 input cable assembly CN1-1,2,3 VIN1 Main Input Power Supply (10.8V < VIN1 < 13.2V) CN1-4,5,6 GND Power Supply Return CN1-7 AGND Analog Signal Ground CN1-8 NC CN1-9 SLEEP CN1-10 BRITE CN1-11 SET1 SET1 MSB Connecting this pin to ground decreases the output current (see Table 1) CN1-12 SET2 SET2 LSB Connecting this pin to ground decreases the output current (see Table 1) No Connect ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON Brightness Control (0.65V to 2.0V). 2.0VDC gives maximum lamp current. CN2,3-1 VHI1 High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. CN2,3-2 VHI2 High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. CN2,3-3 NC Open Pin CN2,3-4 VLO Connection to low side of lamps. Connect to lamp terminal with longer lead length. DO NOT connect to Ground Copyright 2002 Rev. 0.5a, 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 (JST SM04(4.0)B-BHS-1-TB) PanelMatch™ I N T E G R A T E D LXM1644-12-61 12V Quad 6W 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 (TWO LAMPS) SET1 (Pin 11) Open* Open* Ground Ground SET2 (Pin 12) Open* Ground Open* Ground Nominal Output Current 16.0mA 14.0mA 12.0mA 10.0mA * If driven by a logic signal it should be open collector or open drain only, not a voltage source. PHYSICAL DIMENSIONS 7.40in 188mm 7.16in 0.23in 182mm 0.15in 6mm 4mm 0.15in CN-1 W 4mm 1.41in. 36mm W 3.70in 0.15in 94mm 4mm SM04(4.0)B-BHS-1-TB (JST) GROUNDED MOUNTING HOLES 3.18MM ±.08 DIA. Warning High Voltage Present at high side of both Transformers and Output Connectors 0.315in. 8.0mm Max PCB tolerances ± 0.5mm 0.060in. Weight: 44g typ. 1.52mm SIMPLIFIED BLOCK DIAGRAM High Voltage T ransformers VHI 10K V BR IT E V IN 1 SET 1 Z Z O C SEN SE PACKAGE DATA 10K LAMP +3V O V SEN SE +3V SET 2 V HI Controller and Transform er Driver LAMP +3V 10K I SENSE V LO O ne of two Copyright 2002 Rev. 0.5a, 2003-01-20 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 LXM1644-12-61 12V Quad 6W CCFL Programmable Inverter Module P RELIMINARY D ATASHEET 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 1.8K to 3.9K resistor to set the lower threshold voltage. A 3.3V Logic Level PWM signal from a microcontroller may also be used as shown in Figure 1A. 12V DAC or Pot V IN 1 BRITE V H1 V H2 20K LXM1644-12-61 Rx* If you need to turn the inverter ON/OFF remotely, connect to TTL logic signal to the SLEEP input. SLEEP SET 1 SET 2 G ND 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. O ne of two NC NC V LO *Set Rx from 1.8K to 3.9K depending on panel minimum lamp current requirements Figure 1 – Brightness Control (Output current set to maximum) PW M Signal from System 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. BRITE P.W . LXM1644-12-61 10us to 125uS 26% < P.W. < 100% of period Figure 1A – PWM Brightness Control 12V BRITE V IN1 LXM1644-12-61 SLEEP SET 1 SET 2 GND One of two L 10.0mARMS H 12.0mARMS L 14.0mARMS H 16.0mARMS L=GND; H=Open Figure 2 – Max Output Current (Two Lamps) (SET1 and SET2 Inputs) 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 return is open (lamp disconnected or broken) or shorted the inverter will attempt to strike the lamp for several seconds. After about a second 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. In the timeout shutdown mode input drain current will be about 8mA. Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 APPLICATION L L H H Copyright 2002 Rev. 0.5a, 2003-01-20 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 LXM1644-12-61 12V Quad 6W 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. 0.5a, 2003-01-20 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6