LX6503AID

PRODUCT BRIEF LX6503A High Performance CCFL Controller DESCRIPTION CCFL Controller for Next Generation of 40 inch and Larger LCD TVs Quality and Performance Integrates JIN’s PureBLACKTM Megacontr KM The LX6503A is a high performance CCFL controller optimized for larger LCD-TV and other multi-lamp LCD display systems. It enables cost competitive solutions for off-PFC HV-LIPS inverter applications. The controller provides a pair of push-pull PWM simple external circuitry. An on-chip regulator supplies both the operating voltage for the output gate drive and bias to the internal control of the possible inverter start up surge current and lamp current/voltage overshoot and SYNC functionality enables inverter synchronization to an external source frequency. The LX6503A integrates JIN’s PureBLACKTM megacontrast digital burst dimming functionality to provide true black mega contrast capabilities for CCFL based displays. In addition, reliable fault detection and protection functions are facilitated including open lamp, over voltage, short circuit, and over current protection. Furthermore, programmable striking frequency, programmable Key Features 400V Off-PFC HV-LIPS Support > Half-bridge or Full-Bridge drive support for inverters Optimal System Cost and Increased Efficiency > Reduced number of power stages increase efficiency at a reduced overall system BOM – easier regulatory agency compliance Integrated JIN’s PureBLACKTM Mega Dimming > Supports BURST PWM dimming for ‘true zero’ percent duty cycle operation Enhanced Image Quality and more Realistic Video > Superior black levels for increased dynamic contrast ratio > Great shadow detail for a more enjoyable viewing experience Comprehensive Brightness Control Modes > Analog only adjust lamp current only > Analog BURST Dimming analog voltage to BURST PWM > Digital BURST Dimming Direct PWM BURST input Increased Flexibility and Performance > Wide dimming range and multiple architecture support > Ease of implementation > Reduced cost with reduction of external components Multiple Drive Topologies Supported > Push-Pull, Half-bridge, and Full-bridge > 600mA sourcing or sinking gate drivers Ease of Use and Flexibility > One device supports multiple inverter architectures and applications > Reduces cost by eliminating need for high current external buffer Lamp Frequency Synchronization - SYNC > Auto sync signal detection to lower or higher external frequency with min/max limiting and frequency hold Improved Versatility/Performance with Reduced Cost > Improved image quality with reduced beat frequency artifacts > Integration reduces cost while supporting multiple formats/sources Protection, Lamp Strike, Detection, and Operation > OLP, OVP (regulation/protection), OIP and Short Circuit > Programmable STRIKE and Fault time (run mode) > Programmable STRIKE frequency Reliability, Flexibility, Ease of Use, and Reduced Cost > User configurable, supports multiple panel types and customer need > Enhanced operation at very low duty cycles to avoid false open lamp protection while detecting true open lamp detection APPLICATIONS > Large screen LCD Televisions > Multi-lamp LCD monitors for demanding graphics and imaging applications > CCFL, EEFL, FFL Backlight systems PRODUCT BRIEF LX6503A Additional Features LX 6503A Supports 400V PFC or 24V Inverter Applications AC Rectification, PFC, TV SMPS Voltages VIN 24V Inverter Supply 400V PFC Inverter Supply Inverter Transformer A_OUT CCFL LAMPS ® OR JIN Current Balancing L1B1 L1B2 POWER INPUT POWER STAGE PWM DRIVER PWM Steering Shut Down > Soft Start Control PWM_DIM VDD Regulator Control / Reset B_OUT ISOLATION, DRIVE and POWER Stage Circuitry AC+ AC- > Highly accurate lamp operation ANALOG_DIM SYNC ENABLE CONTROL PureBLACK™ Megacontrast Dimming FREQUENCY SYNC ENABLE PROTECTION Voltage Sense Current Sense Soft Start COMP Fault VSNS ISNS Voltage and Current Sensing RS2 RS1 ISNS CCFL LAMPS L1B1 L1B2 LX 6503A ® HV-LIPS Overall System Diagram frequency > ENABLE control signal ratios (typical) > JIN Balancer optimized to support dimming > Industrial Temperature Grade Ordering Information LX6503AID SOIC, 16 lead, Narrow Body, RoHS compliant, Pb-free, Industrial Temperature, Tubes 2500 pcs/reel JA JA = 82.2°C/W = 82.2°C/W LX6503AID – TR SOIC, 16 lead, Narrow Body, RoHS compliant, Pb-free, Industrial Temperature, Tape and Reel Technical Support Information: Microsemi Field Applications Engineer. For more information about Microsemi products and the name of a local representative, distributor or sales person, Microsemi Corporation, Analog Mixed Signal Group, 11861 Western Ave., Garden Grove, CA 92841 Ph: +1 (714) 898-8121