LXM1614

A MICROSEMI
 COMPANY RangeMAX™ LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE P RELIMINARY D ATAS HEET
 Dual Drive, RangeMAX Wide Range Dimming, Single Output Inverter. The  
Independent Brightness
W W W . Microsemi . COM 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 Linfinity’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 inverters provide brightness adjustments utilizing standard lamp current amplitude control as well as supporting Linfinity’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. Dual Drive Dimming Control. (continued next page)






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 1800V Output Voltage Capability Single side PCB Component Layout    
Self Heating And High Pressure Lamp Technology
Automotive Navigation, GPS IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com 
  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 Controlled overdrive mode of LXM1614 Inverter accelerates lamp warm-up time to provide maximum light output even in extreme temperature environments LXM1614-14-11 LXM1614-14-11
   PART NUMBER LXM1614-14-11 Copyright © 2000 Rev. 0.3b,2000-11-20 OUTPUT CONNECTOR JST SM02(8.0)B-BHS-1-TB INVERTER MATES DIRECTLY TO PANEL CONNECTORS BHR-03VS-1 Page 1 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 A MICROSEMI
 COMPANY RangeMAX™ LXM1614-14-11 DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE P RELIMINARY D ATAS HEET
   
 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. W W W . Microsemi . COM 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.         Input Supply Voltage (VIN) ...................................................................................................................................-0.3V to 17V Output Voltage, no load...........................................................................................................Internally Limited to 1800VRMS Output Current................................................................................................................... 16mARMS (