RangeMAX™ I N T E G R A T E D P R O D U C T S LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RODUCTION D ATASHEET LXM1614 series of Direct Drive™ CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules is specifically designed for driving LCD backlight lamps. Although similar to the RangeMAX LXM1612 wide range dimming inverters, the LXM1614 family offers two separate brightness controls for lamp current amplitude and duty cycle. This innovation of dual brightness control with extended dimming, combined with Microsemi’s high efficiency Direct Drive topology, provides the industry’s most feature rich, small form factor inverter available. The wide range dimming provides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light operating capability. KEY FEATURES The adjustments utilizing standard lamp current amplitude control as well as supporting Microsemi’s RangeMAX wide range dimming technique. Combining both brightness controls into a single inverter supports the “self heating” lamp technology by using a “boost” current feature and still offers duty cycle control for low brightness operation. This controlled overdrive capability eliminates the need for traditional resistive heater wire methods to ensure light output at extremely low temperatures. The LXM1614 brightness controls support temperature monitoring with look-up table applications by accepting either a PWM input or DC voltage. Large panel lamps with greater thermal inertia can also utilize this “instant-bright” feature and minimize warm up time. (continued next page) 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 PRODUCT HIGHLIGHT Independent Brightness Controls For Lamp Current Amplitude and Duty Cycle RangeMAX 1-100% Wide Range Dimming with Controlled Overdrive Boost On-Board Thermister automatically limits maximum lamp current Supports Wide Input Voltage Range 9-16V High Efficiency, Single Stage Direct Drive Topology -40°C to +85°C Ambient Temperature Operation Output Open/Short Circuit Protection Up to 2000V Output Voltage Capability Single side PCB Component Layout APPLICATIONS Self Heating And High Pressure Lamp Technology Automotive Navigation, GPS Systems, Auto PC Extended Cold Temperature Operation Aircraft Cabin Displays Low Ambient Light Conditions Requiring Wide Range Dimming “Instant On” To Full Brightness For Large LCD Backlight Panels Industrial Notebook And Workstations LXM1614-14-11 Controlled overdrive mode of LXM1614 Inverter accelerates lamp warm-up time to provide maximum light output even in extreme temperature environments MODULE ORDER INFO PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO PANEL CONNECTORS LXM1614-14-11 JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00 BHR-03VS-1 Copyright © 2002 Rev. 1.0a,2005-01-31 WWW . Microsemi .C OM DESCRIPTION Dual Drive, RangeMAX Wide Range Dual Drive Dimming Control. Dimming, Single Output Inverter. The inverters provide brightness Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 RangeMAX™ I N T E G R A T E D LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P R O D U C T S P RODUCTION D ATASHEET Direct Drive Technology. An on-board thermister monitors the inverter’s relative The module design is based on the Direct Drive topology, temperature and limits the maximum allowable lamp current. This current limit automatically protects the lamp which provides a number of cost, performance, and form and inverter as a function of temperature which helps factor advantages. The LXM1614 series inverters eliminate the classic resonant inductor/capacitors and integrate the control the system during Boost mode. wide range dimming logic into the controller. RangeMAX Digital Dimming Technique. Digital dimming provides flicker-free brightness control in any wide range dimming application. Dimming ratios greater than 100:1 can be achieved. A video synchronization feature allows wide ratio dimming without the display disturbances and interference seen with competitive products. The resultant “burst drive” that energized the lamp was designed specifically to ensure that no premature lamp degradation occurs. Even in overdrive boost mode, the waveform is carefully controlled to minimize the effects that are detrimental to lamp life. Individual panel specifications should be referenced for specific thermal and electrical parameters. Additional Features. Other benefits of this new topology are fixed-frequency operation and secondary-side strike-voltage regulation. Strike-voltage regulation minimizes corona discharge in the output transformer and related circuitry, providing longer life and higher reliability. All LXM1614 modules feature both open and shorted lamp protection. The dual drive LXM1614 is fully customizable (electronically and mechanically) to specific customer requirements. WWW . Microsemi .C OM DESCRIPTION (CONTINUED) ABSOLUTE MAXIMUM RATINGS (NOTE 1) Input Supply Voltage (VIN) ................................................................................................................................... -0.3V to 17V Output Voltage, no load .......................................................................................................... Internally Limited to 2000VRMS Output Current full boost ................................................................................................... 13mARMS (<2 minutes @TA<25°C) Output Current nominal boost ................................................................................................................................. 6.1mARMS Output Power ......................................................................................................................................... 10W (-40°C to 25°C) Output Power ............................................................................................................................................ 6W (26°C to 85°C) Input Signal Voltage (BRITE, BOOST)............................................................................................................... -0.3V to 5.5V Input Signal Voltage (SLEEP, VSYNC) ................................................................................................................. -0.3V to 5.5V Ambient Operating Temperature, zero airflow...................................................................................................-40°C to 85°C Storage Temperature Range ..........................................................................................................................-40°C to 125°C RECOMMENDED OPERATING CONDITIONS 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. Symbol VIN Voltage Range VIN Output Power PO Brightness Control Input Voltage Range VBRT_ADJ BOOST Control Input Voltage Range Recommended Operating Conditions Min R.C. Max 9.0 0.0 16.0 V 6.0 W 5.0 V VBST_ADJ 0.0 5.0 V Lamp Operating Voltage VLAMP 500 1000 VRMS Lamp Current Full Brightness IOLAMP 3.5 9.0 mARMS TA -40 85 °C Operating Ambient Temperature Range Copyright © 2002 Rev. 1.0a,2005-01-31 1.5 Units Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 LXM1614-14-11 Parameter Page 2 RangeMAX™ I N T E G R A T E D P R O D U C T S LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RODUCTION D ATASHEET ELECTRICAL CHARACTERISTICS Parameter ` Lamp Current, Full Boost IL(BOOST5) Lamp Current, Full Boost IL(BOOST1.5) Lamp Current, No Boost IL(BOOST0) Lamp Start Voltage VIN=9V, BRITE= 5V, BOOST= 5V, TA per Figure 9 VIN=9V, BRITE= 5V, BOOST= 1.5V, TA per Figure 9 VIN=9V, BRITE= 5V, BOOST= 0V, TA per Figure 9 8 8.8 9.4 5 5.7 6.4 3 3.8 4.6 BRITE = BOOST = 0V .12 Units BRITE= 5V 55 65 mARMS mARMS mARMS 2000 TFAULT 75 1.0 VRMS KHz SEC BRITE INPUT Linear Dim Control Range Input Current VBRT IBRT 0.5 BRITE= 0V BRITE= 5V Input Voltage for Max. Lamp Current VBRT_ADJ IO(LAMP) = 100% Duty Cycle Input Voltage for Min. Lamp Current VBRT_ADJ IO(LAMP) = Minimum Duty Cycle 4.5 10 10 VDC µADC µADC 4.5 5.0 VDC 0 0.5 VDC BOOST INPUT Linear Dim Control Range Input Current VBST IBOOST 0.5 BOOST= 0V BOOST= 5V 4.5 10 10 VDC µADC µADC Input Voltage for Max. Boost Current VBST_ADJ 4.5 5.0 VDC Input Voltage for Min. Boost Current VBST_ADJ 0 0.5 VDC RUN Mode VSLEEP 2.4 VIN VDC OFF Mode VSLEEP 0.8 VDC SLEEP INPUT Input Current ` IL(MIN) FO Fault Timeout ` LXM1614-14-11 Min Typ Max VLS Operating Frequency ` Test Conditions OUTPUT PIN CHARACTERISTICS Min. Average Lamp Current (Note 2) ` Symbol WWW . Microsemi .C OM Unless otherwise specified, these specifications apply over the recommended operating conditions and TA = -40 to 85°C ambient temperature for the LMX1614-14-11. IISLEEP 0 110 SLEEP=5V SLEEP=0V µA 0 VSYNC CHARACTERISTICS VSYNC (HI) 2.4 5.5 VDC Logic Low Level VSYNC (LO) -0.3 0.8 VDC Input Impedance ZIN Input Frequency FVSYNC Minimum pulse width >1uS 50 Output Burst Rate FBURST VSYNC=0V, Free Run Frequency 145 10 170 KΩ 145 Hz 195 Hz 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 full lamp current) Copyright © 2002 Rev. 1.0a,2005-01-31 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 ELECTRICALS Logic High Level RangeMAX™ I N T E G R A T E D LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P R O D U C T S P RODUCTION D ATASHEET FUNCTIONAL PIN DESCRIPTION Pin WWW . Microsemi .C OM Conn. Description CN1 (Molex 53261-0890)* CN1-1,2 VIN Main Input Power Supply (9V to 16V) CN1-3,4 GND Power Supply Return CN1-5 SLEEP > 2.4V (Backlight on), < 0.8V (Backlight off), IISLEEP=110µA @ 5.0V CN1-6 BOOST Lamp Current Amplitude Control (0.5-4.5VDC) 4.5VDC gives maximum boost CN1-7 BRITE Brightness Control (0.5- 4.5VDC) 4.5VDC gives maximum lamp current CN1-8 VSYNC Vertical Synchronization Input (50 < fSYNC < 145Hz), minimum pulse width 10µS CN2 (JST SM02(8.0)B-BHS-1-TB | Yeon Ho 20015WR-05A00) CN2-1 CN2-2 VOUT1 VOUT2 High Voltage CCFL Lamp Supply High Voltage CCFL Lamp Return * LX9501 Mating Connector Assembly Available PHYSICAL DIMENSIONS 120mm 10mm 4.724in. 0.394in. X CN1 23mm 20mm 0.905in. 0.787in. 3mm ± .08mm CN2 W 0.118in. 10mm 0.394in. 130mm 5.118in. 8.5mm 0.335in. PCB tolerances ± 0.5mm Weight: 12.5(g) typ. 1mm 0.0393in. All Dimensions are millimeters. Inches for reference only MECHANICALS Copyright © 2002 Rev. 1.0a,2005-01-31 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 RangeMAX™ I N T E G R A T E D P R O D U C T S LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RODUCTION D ATASHEET High Voltage Transformer WWW . Microsemi .C OM HOW THE RANGEMAX WORKS V OUT1 V BST Gain & Summing Transformer Driver Comparator LAMP .5 4.5V DC V SENSE ISENSE V BRT Ramp .5 4.5V DC V SYNC + - Ramp Gen. & PLL Temperature Sense I/V V OUT2 Figure 1 – RangeMAX Simplified Block Diagram HIGHLIGHTS • Copyright © 2002 Rev. 1.0a,2005-01-31 • In applications with no access to a vertical sync, an onboard oscillator operates the inverter burst rate at about 170Hz. 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. • 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. • A single input will accommodate negative and positive vertical sync pulses at any pulse width. Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 DESCRIPTION Integrated dual 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. RangeMAX™ I N T E G R A T E D P R O D U C T S LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RODUCTION D ATASHEET WWW . Microsemi .C OM HOW THE RANGEMAX WORKS (CONTINUED) LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION Figure 2 – LXM1614 Combines Current Amplitude and Digital Techniques The LXM1614 provides both lamp current amplitude control (BOOST) and a brightness control (BRITE) for dimming. Please see following sections for dimming and amplitude boost control. To achieve extremely wide dimming ranges, rather than only using the traditional dimming technique of varying lamp current magnitude to adjust light output, RangeMAX inverters utilize 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 2% of its full brightness As can be seen in Trace 4 of Figure 5, 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 – 50% Burst Duty Cycle Figure 4 – 2% Burst Duty Cycle DESCRIPTION Figure 5 – 2% Burst Duty Cycle (Expanded Time Base) Copyright © 2002 Rev. 1.0a,2005-01-31 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 RangeMAX™ I N T E G R A T E D LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P R O D U C T S P RODUCTION D ATASHEET DUAL DIMMING CAPABILITY As seen in the Brightness vs. Time graphs, the boost mode operation can improve the performance of cold cathode florescent lamps in any LCD application by reducing the time it takes to warm up lamps to their optimum operating temperature. This feature is helpful in large LCD multi-lamp monitors as well as automotive or industrial extreme temperature applications. The “boost” control is used to provide a timed overdrive mode to maximize light output over temperature. After a panel is characterized with a profile of the user’s application (such as desired light output as a function of ambient light and temperature), the appropriate boost level and duration of the boost can be set. Further wide range dimming control is provided by the Brite input dimming function. Figure 6- DESCRIPTION Figure 7 Copyright © 2002 Rev. 1.0a,2005-01-31 WWW . Microsemi .C OM HOW THE RANGEMAX WORKS (CONTINUED) - Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 RangeMAX™ I N T E G R A T E D LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P R O D U C T S P RODUCTION D ATASHEET WIDE RANGE DIMMING FUNCTION AMPLITUDE BOOST FUNCTION Dimming can be controlled by a DC voltage (like a voltage output DAC) or by a PWM signal (5V logic level PWM signal from a micro controller). The PWM signal should be 400Hz to 4kHz, 0V to 5V, 0% to 100% duty cycle. The Boost Function Control signal levels are the same as the Dimming Control. Less than 0.5V provides 4mA maximum lamp current while 4.5V on Boost provides “max boost” with a max lamp current of 9mA. Please note that these maximum lamp current levels are protected by the onboard thermistor which limits the maximum lamp current automatically as a function of temperature as seen in Figure 9. Brightness Lamp Current (mArms) control range WWW . Microsemi .C OM HOW THE RANGEMAX WORKS (CONTINUED) control range 100% boost mode 9 VIN = 9V 4 no boost mode Typical curve for 5.8” panel. Other panels may be different. 1% BRITE 0.0 V Figure 8 0.5 V 4.5 V IBOOST 5.0 V 0.0 0.5 4.5 5.0 - Brightness as a function of the BRITE control (CN1-7) Figure 9 – Maximum lamp current as a function of the Boost control (CN1-6) Lamp Current (mArms) 9.0 7.5 VIN = 9V 5.5 4.0 DESCRIPTION Typical curve for 5.8” panel. Other panels may be different. Temp -40 Figure 10 0 25 85°C – Maximum lamp current as a function of ambient temperature Copyright © 2002 Rev. 1.0a,2005-01-31 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 RangeMAX™ I N T E G R A T E D P R O D U C T S LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RODUCTION D ATASHEET • 9V-16V BOOST V IN BRITE V OUT1 CCFL TUBE LXM1614-14-11 SLEEP 0V SYNC GND V O UT2 2.5V V SYN C Figure 11 - Brightness Control PW M Signal from System The BRITE/BOOST control may be a voltage output DAC, or other voltage source as shown in Figure 11. A 5V Logic Level PWM signal from a micro-controller may also be used as shown in Figure 12. • 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 a 2.4V to 5V logic signal to the SLEEP input. If remote ON/OFF is not needed, connect the SLEEP input to VIN or other voltage source between 2.4V and 5V. • Connect VOUT1 to the high voltage supply wire from the lamp. Connect VOUT2 to the high voltage return wire from the lamp. BOOST BRITE WWW . Microsemi .C OM TYPICAL APPLICATION RangeMAX INVERTERS P.W . LXM1614-14-11 2.5mS to 250µS 0 < P.W. < 100% of period Also available in other wide range dimming single lamp inverters LXM1612-xx-xx, LXM1615, LXM1617/8-xxxx, Dual Output LXM1621-01, LXM1622-xx-xx, LXM1623/4-xx-xx and Quad Output LXM1641-01, LXM1643-12-6x versions for multiple lamp applications. Figure 12 - PW M Brightness Control APPLICATION 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 © 2002 Rev. 1.0a,2005-01-31 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9