LXM1612-12-xx I N T E G R A T E D P R O D U C T S 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RODUCTION D ATASHEET KEY FEATURES DESCRIPTION Input Voltage Range: The modules convert DC voltage from the system battery or AC adapter directly to highfrequency, high-voltage waves required to ignite and operate CCFL lamps. A 5V input inverter is also available (LXM1612-05-xx). Direct Drive Technology: The module design is based on a new Direct Drive topology, which provides a number of cost and performance advantages. Additional Features: Other benefits of this new topology are fixed-frequency operation and secondary-side strikevoltage regulation and all LXM1612-12xx modules feature both open and shorted lamp protection. 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; Patents Pending PRODUCT HIGHLIGHT RangeMAX Wide Range Dimming 9.6V to 14.4V Input Voltage Fully Integrated Direct Drive And Dimming Control Single Sided PCB Layout Easy To Use Brightness Control MicroAmp SLEEP Mode Output Short-Circuit Protection And Automatic Strike-Voltage Regulation Fixed Frequency Operation UL 60950 E175910 WWW . Microsemi .C OM RangeMAX Wide Range Dimming, Single Output Inverter. The LXM161212-xx series of Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving LCD backlight lamps. RangeMAX Digital Dimming Technique. Digital Dimming provides flicker-free brightness control in any wide-range dimming application. The modules are equipped with a dimming input that permits brightness control from an external potentiometer, DC voltage source, or PWM signal. The resultant "burst drive" that energizes the lamp was designed specifically to ensure that no premature lamp degradation occurs. APPLICATIONS Notebook And Sub-Notebook Computers Portable Instrumentation Desktop Displays Low Ambient Light Conditions (i.e. Aircraft Cabins, Automobile) BENEFITS DC Voltage Source PWM Signal 3 Potentiometer 1 2 BRITE W UNIVERSAL DIMMING INPUT OR POTENTIOMETER LXM1612-12 "PWM", VDC, Smooth, Flicker Free 1-100% Full-Range Brightness Control Gives Your Product A High Quality Image Output Open Circuit Voltage Regulation Minimizes Corona Discharge For Long Life And High Reliability Power Efficient. "Low Brightness" Capability Allows For Advanced Power Management PACKAGE ORDER INFO PART NUMBER OUTPUT CONNECTOR LXM1612-12-01 LXM1612-12-02 LXM1612-12-03 JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00 JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00 Honda QZ-19-A3MYL #02 Copyright (c) 2000 Rev. 1.0a, 2005-01-10 INVERTER MATES DIRECTLY TO PANEL CONNECTORS BHR-03VS-1 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 LXM1612-12-xx I N T E G R A T E D P R O D U C T S 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RODUCTION D ATASHEET ABSOLUTE MAXIMUM RATINGS (NOTE 1) 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 Input Signal Voltage (VIN1) ................................................................................................................................. -0.3V to 16V Output Voltage, no load .........................................................................................................Internally Limited to 1800VRMS Output Current ........................................................................................................................ 8.0mARMS (Internally Limited) Output Power .................................................................................................................................................................. 6.0W Input Signal Voltage (BRITE Input) .................................................................................................................. -0.3V to 5.5V Input Signal Voltage ( SLEEP , VSYNC Inputs)..................................................................................................... -0.3V to 5.5V Ambient Operating Temperature, zero airflow .....................................................................................................0C to 70C Storage Temperature Range .............................................................................................................................. -40C to 85C FUNCTIONAL PIN DESCRIPTION CONN PIN DESCRIPTION CN1 (Molex 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins CN-1 CN1-2 CN1-3 CN1-4 CN1-5 VIN1 Main Input Power Supply (9.6V < VIN1 < 14.4V) GND Power Supply Return SLEEP ON/OFF Control. (2.1V < SLEEP < VIN1 = ON, 0V < SLEEP < 0.8V = OFF, SLEEP Floating=OFF) CN1-6 BRITE Brightness Control (0.0V to 2.5VDC). 2.5VDC gives maximum lamp current. CN1-7 BRITE RTN CN1-8 VSYNC Analog Ground. Use for BRITE signal return ONLY. Vertical Synchronization Input. 2.5 to 5.0V Logic Level. (20Hz < fSYNC < 200Hz) CN2 for LXM1612-12-01 and -02 (JST SM02(8.0)B-BHS-1-TB | Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB | Yeon Ho 35001WR-02A00) CN2-1 VHI High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. CN2-2 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground CN2 for LXM1612-12-03 (Honda QZ-19-A3MYL#02) CN2-3 VHI High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. CN2-1 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground PHYSICAL DIMENSIONS PACKAGE DATA LXM1612-12-XX 4.96in. 126mm MOUNTING HOLE 3.0mm DIA. .08 DIA X CN1 0.13in. 0.63in. 3.3mm 16mm 0.5in. CN2 12.7mm W GROUNDED MOUNTING HOLE 0.66in. 3.0mm DIA. .08 DIA 3.64in. 92.5mm 16.75mm 0.06in. 1.52mm 0.315in. 8.0mm PCB tolerances 0.5mm Copyright (c) 2000 Rev. 1.0a, 2005-01-10 Warning High Voltage Present at all Output Connectors Weight: 12.5 (g) typ . Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LXM1612-12-xx I N T E G R A T E D 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P R O D U C T S P RODUCTION D ATASHEET Parameter Symbol Input Supply Voltage Range (Fully Regulated Lamp Current) Input Supply Voltage Range (Functional) Output Power Brightness Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness) Operating Ambient Temperature Range Recommended Operating Conditions Min R.C. Max VIN1 PO VBRT_ADJ VLAMP IOLAMP TA 10.8 12 13.2 9.6 12 3.5 2.5 535 5.8 14.4 4.0 5 620 0.0 450 0 Units V W V VRMS mARMS C 70 WWW . Microsemi .C OM 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. ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the recommended operating conditions and ambient temperature of 25C except where otherwise noted. Parameter Min. Average Lamp Current (Note 2) Lamp Start Voltage Operating Frequency IL(MIN) VLS IBRT Units VBRT_ADJ=2.5VDC, SLEEP=HIGH, Burst Duty=100%, VIN1=12VDC VBRT_ADJ=0VDC, SLEEP =HIGH, Burst Duty=2.0%, VIN1=12VDC 0C <TA < 70C, VIN1 > 9.6VDC VBRT_ADJ=2.5VDC, SLEEP=HIGH, VIN1=9.6V - 14.4V 5.2 5.8 6.4 0.12 mARMS mARMS 1500 1650 1800 VRMS 63 68 73 kHz VBRT_ADJ=0VDC -685 -728 -775 ADC VBRT_ADJ=2.5VDC -260 -282 -305 ADC 2.35 2.40 VDC Input Voltage for Max. Lamp Current VBRT_ADJ IO(LAMP)=100% Duty Cycle 2.30 Input Voltage for Min. Lamp Current VBRT_ADJ IO(LAMP)= Minimum Duty Cycle 0.0 SLEEP INPUT RUN Mode V SLEEP(HI) VIN1=12V 1.9 SLEEP Mode V SLEEP(LO) VIN1=12V -5.0 1.9 2.0 VDC SLEEP=5.0V SLEEP =0V 390 410 435 ADC 0.0 0.0 0.0 ADC VSYNCH(HI) VIN1=12V 1.50 2.5 5.0 VDC VSYNCH(LO) VIN1=12V I SLEEP VDC 2.1 VIN1 VDC -3.0 0.0 1.2 VDC Input Impedance ZIN 25 27 29 K Input Frequency fSYNC 20 200 Hz 10 ADC POWER CHARACTERISTICS Sleep Current IIN(MIN) VIN1=12VDC, SLEEP=0.0V 0.0 0.5 Note 2: Minimum lamp current required to maintain even light output may vary with display panel. Average RMS current = (burst duty cycle) x (burst amplitude of 5.8mARMS) Copyright (c) 2000 Rev. 1.0a, 2005-01-10 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 ELECTRICALS VSYNC CHARACTERISTICS Logic High Level LXM1612-12-xx Min Typ Max BRITE INPUT Input Current IL(MAX) fO Input Current Test Conditions OUTPUT PIN CHARACTERISTICS Full Bright Lamp Current Symbol LXM1612-12-xx I N T E G R A T E D P R O D U C T S 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RODUCTION D ATASHEET WWW . Microsemi .C OM HOW RANGEMAX WORKS LAMP VOLTAGE & LAMP CURRENT - Burst Mode Operation Figure 2 - 2% Burst Duty Cycle Figure 1 - 50% Burst Duty Cycle Rather than using the traditional dimming technique of varying lamp current magnitude to adjust light output, RangeMAX inverters use a fixed lamp current value with a duty cycle control method. The lamp current burst width can be modulated from 100% (continuous lamp current) down to a 2% duty cycle, allowing the lamp to be dimmed to less than 1% of its full brightness. As can be seen in Trace 4 of Figure 3 photo at right, careful design consideration was given to controlling lamp start voltage to softly start current flow. This eliminates current overshoot that can result in premature cathode wear and reduce lamp life. Figure 3 - 2% Burst Duty Cycle (Expanded Time Base) High Voltage Transformer Comparator VBRITE VHI + 0.25 2.5VDC Transformer Driver Ramp DESCRIPTION LAMP - Ramp Gen VSENSE VSYNC ISENSE VLO Figure 4 - RangeMAX Block Diagram Copyright (c) 2000 Rev. 1.0a, 2005-01-10 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LXM1612-12-xx I N T E G R A T E D P R O D U C T S 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RODUCTION D ATASHEET Highlights Integrated brightness control circuit includes a DC voltage to pulse width converter that minimizes system design work and system noise susceptibility. This provides a familiar and convenient interface while reducing the potential for externally induced noise, which can cause lamp flicker. RangeMAX inverter modules are designed to operate with the burst frequency synchronized to the video frame rate. This provides operation with no visible display disturbances caused by beat frequencies between the lamps and video frame rates. In this synchronous mode, the inverter burst rate operates at twice the video refresh rate, well beyond standard 50/60Hz video refresh rates where the eye can perceive pulsing light. In applications with no access to a vertical sync., an onboard oscillator operates the inverter burst rate at about 250Hz. In this non-synchronous mode, minor display disturbances can be found under certain video conditions. This performance may be acceptable for many applications, but synchronization must be used when no disturbance can be tolerated. A single input will accommodate negative and positive vertical sync pulses at any pulse width. Separate feedback loops for lamp current and open circuit voltage regulation insure reliable strike under all operating conditions, automatic over-voltage prevention with broken or failed lamps, and accurate lamp current regulation. WWW . Microsemi .C OM HOW RANGEMAX WORKS (CONTINUED) TYPICAL APPLICATION 12V DAC or Pot BRITE V IN1 The brightness control may be a voltage output DAC, digital resistor or a simple 10k potentiometer. If desired, an additional series resistor with the 10k potentiometer can be used to set a higher minimum brightness setting as shown in Figure 5. A 2.5V to 5V Logic Level PWM signal from a micro-controller may also be used as shown in Figure 5A. If synchronization to the video frame rate is desired, connect the vertical sync pulse from the system video controller to the VSYNC input. If no video synchronization is desired, connect VSYNC to ground. If you need to turn the inverter ON/OFF remotely, connect to 2.5V to 5V 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. V HI 10k CCFL TUBE LXM1612-12-xx R BRITE RTN V SYNC 5V SLEEP GND V LO 0V V SYNC Figure 5 - Potentiometer Brightness Control PW M Signal from System BRITE P.W . LXM1612-12-xx < 2ms 0 < P.W. < 100% of period Figure 5A - PW M Brightness Control LXM1612-12-XX OUTPUT CURRENT ADJUST R4 R40 C6 C21 R11 U1 R5 R17 R36 R37 R39 C12 C8 R38 R14 C16 C15 C5 R35 R32 R31 R41 R15 R12 C2 R2 R20 R7 C11 C4 C7 R16 Not Used Not Used Not Used 499K 1% 178K 1% 78.7K 1% C9 D1 R12 2.00K 1% 2.61K 1% 2.74K 1% 2.74K 1% 2.74K 1% 2.74K 1% R3 C3 U3 R21 Output Current 7.0mA 6.0mA 5.8mA 5.0mA 4.0mA 3.0mA R34 R6 C14 C13 C10 C17 R33 DESCRIPTION R30 U4 D2 The LXM1612-12 output current can be adjusted by changing the value of two resistors on the PCB. The following table shows the approximate new output current values: R16 R10 R13 Figure 6- Component Replacement Locations Copyright (c) 2000 Rev. 1.0a, 2005-01-10 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LXM1612-12-xx I N T E G R A T E D P R O D U C T S 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RODUCTION D ATASHEET NOTES WWW . Microsemi .C OM 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) 2000 Rev. 1.0a, 2005-01-10 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6