LXM1614E-14-11

RangeMAX™ TM ® LXM1614E-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RELIMINARY D ATASHEET DESCRIPTION Dual Drive, RangeMAX Wide Range Dual Drive Dimming Control. Dimming, Single Output Inverter. The inverters provide brightness KEY FEATURES W WW . Microsemi . C OM LXM1614E 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 LXM1614E 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. 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 LXM1614E 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. 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 (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; Patents Pending PRODUCT HIGHLIGHT Controlled overdrive mode of LXM1614E Inverter accelerates lamp warm-up time to provide maximum light output even in extreme temperature environments LXM1614E-14-11 LXM1614E-14-11 MODULE ORDER INFO PART NUMBER LXM1614E-14-11 Copyright © 2004 Rev. 0.2,2005-01-14 OUTPUT CONNECTOR JST SM02(8.0)B-BHS-1-TB INVERTER MATES DIRECTLY TO PANEL CONNECTORS BHR-03VS-1 Page 1 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 RangeMAX™ TM ® LXM1614E-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RELIMINARY D ATASHEET DESCRIPTION (CONTINUED) 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 LXM1614E 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. W WW . Microsemi . C OM Digital dimming provides flicker-free brightness control in any wide range dimming application. With many panels 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 LXM1614E modules feature both open and shorted lamp protection. The dual drive LXM1614E is fully customizable (electronically and mechanically) to specific customer requirements. 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 ( 2.4V (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 < 120Hz), minimum pulse width 10µS CN2 (JST SM02(8.0)B-BHS-1-TB) CN2-1 CN2-2 VOUT1 VOUT2 High Voltage CCFL Lamp Supply High Voltage CCFL Lamp Return * LX9501 Mating Connector Assembly Available PHYSICAL DIMENSIONS 120mm 4.724in. 10mm 0.394in. CN1 23mm 0.905in. 20mm 0.787in. CN2 3mm ± .08mm 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 MECHANICALS Copyright © 2004 Rev. 0.2,2005-01-14 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 RangeMAX™ TM ® LXM1614E-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RELIMINARY D ATASHEET HOW THE RANGEMAX WORKS W WW . Microsemi . C OM VBST 0.5 4.5VDC High Voltage Transformer Gain & Summing Transformer Driver VOUT1 Comparator 0.5 4.5VDC VBRT Ramp ISENSE VSENSE + Ramp Gen. & PLL Temperature Sense I/V VOUT2 VSYNC Figure 1 – RangeMAX Simplified Block Diagram HIGHLIGHTS • 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. The frequency at the VSYNC input will affect the minimum dimming level. Generally, the potential dimming (or brightness) range is inversely proportional to the VSYNC frequency. • 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. LAMP DESCRIPTION DESCRIPTION Copyright © 2004 Rev. 0.2,2005-01-14 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 RangeMAX™ TM ® LXM1614E-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RELIMINARY D ATASHEET HOW THE RANGEMAX WORKS (CONTINUED) LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION W WW . Microsemi . C OM Figure 2 – LXM1614E Combines Current Amplitude and Digital Techniques 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. The LXM1614E 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. Figure 3 – 50% Burst Duty Cycle Figure 4 – 2% Burst Duty Cycle DESCRIPTION DESCRIPTION Figure 5 – 2% Burst Duty Cycle (Expanded Time Base) Copyright © 2004 Rev. 0.2,2005-01-14 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 RangeMAX™ TM ® LXM1614E-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RELIMINARY D ATASHEET HOW THE RANGEMAX WORKS (CONTINUED) DUAL DIMMING CAPABILITY W WW . Microsemi . C OM 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 provides 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 DESCRIPTION Figure 7 - Copyright © 2004 Rev. 0.2,2005-01-14 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 RangeMAX™ TM ® LXM1614E-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RELIMINARY D ATASHEET HOW THE RANGEMAX WORKS (CONTINUED) WIDE RANGE DIMMING FUNCTION AMPLITUDE BOOST FUNCTION W WW . Microsemi . C OM 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. Lamp Current (mArms) control range 9 boost mode Brightness control range 100% VIN = 9V 4 no boost mode Typical curve for 5.8” panel. Other panels may be different. 1% BRITE 0.0 V 0.5 V 4.5 V 5.0 V IBOOST 0.0 0.5 4.5 5.0 Figure 8 7) – Typical brightness as a function of the BRITE control (CN1Figure 9 – Typical maximum lamp current as a function of the Boost control (CN1-6) Lamp Current (mArms) 9.0 7.5 5.5 4.0 Typical curve for 5.8” panel. Other panels may be different. VIN = 9V DESCRIPTION DESCRIPTION Temp -40 Figure 10 0 temperature 25 85°C – Typical maximum lamp current as a function of ambient Copyright © 2004 Rev. 0.2,2005-01-14 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 RangeMAX™ TM ® LXM1614E-14-11 DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE P RELIMINARY D ATASHEET TYPICAL APPLICATION 9V-16V BOOST BRITE LXM1614E-14-11 VIN W WW . Microsemi . C OM • VOUT1 CCFL TUBE 0V 2.5V SLEEP VSYNC SYNC VOUT2 GND Figure 11 - Brightness Control PWM Signal from System P.W. 2.5mS to 250µS 0 < P.W. < 100% of period Figure 12 - PWM Brightness Control BOOST BRITE 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. RangeMAX INVERTERS LXM1614E-14-11 Also available in other wide range dimming single lamp inverters LXM1612-xx-xx, LXM1615-03-xx, LXM1617/8-xx-xx, Dual Output, LXM1623/4-xx-xx, LXM1626-xx-xx, and Quad Output LXM1643-12-6x versions for multiple lamp applications. See the Microsemi website www.microsemi.com for a current list of available inverters products. APPLICATION APPLICATION 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 pre-production form only and may not have completed Microsemi’s Quality Assurance process for Release to Production. Microsemi reserves the right to change or discontinue this proposed product at any time. Copyright © 2004 Rev. 0.2,2005-01-14 Microsemi Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9