LX6523A

PRODUCT BRIEF LX6523A High Performance CCFL Controller DESCRIPTION CCFL Controller for Next Generation of 37 inch and Smaller LCD TVs, Monitors or All-in-One PCs with Ultra-Realistic Display Quality and Performance Integrates JIN’s PureBLACKTM Megacontrast Dimming KM The LX6523A is a high performance CCFL controller optimized for small or medium size 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 the addition of simple external circuitry. An on-chip regulator supplies both the operating voltage for the output gate drive and bias to the internal control possible inverter start up surge current and lamp current/voltage overshoot. The LX6523A 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 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 > Small to medium size LCD televisions > 19” to 30” Multi-lamp LCD monitors > High end graphics and medical imaging monitors requiring highest image quality > CCFL, EEFL, FFL Backlight systems PRODUCT BRIEF LX6523A Additional Features LX 6523A 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 POWER INPUT POWER STAGE PWM DRIVER PWM Steering Shut Down L1B1 L1B2 > Soft Start Control PWM_DIM VDD Regulator Control / Reset B_OUT ISOLATION, DRIVE and POWER Stage Circuitry AC+ AC- > Highly accurate lamp operation +/- 2% +/- 3% CONTROL ANALOG_DIM PROTECTION Voltage Sense Current Sense Soft Start COMP Fault VSNS PureBLACK™ Megacontrast Dimming FREQUENCY ENABLE ISNS ENABLE Voltage and Current Sensing RS2 RS1 ISNS CCFL LAMPS L1B1 L1B2 LX 6523A ® HV-LIPS Overall System Diagram frequency > ENABLE control signal ratios (typical) > JIN Balancer optimized to support dimming > Industrial Temperature Grade Ordering Information LX6523AID SOIC, 14 lead, Narrow Body, RoHS compliant, Pb-free, Industrial Temperature, Tubes 2500 pcs/reel JA JA = 86°C/W = 86°C/W LX6523AID – TR SOIC, 14 lead, Narrow Body, RoHS compliant, Pb-free, Industrial Temperature, Tape and Reel Technical Support Information: For LX6503A / LX6523A and other CCFL or Display family of products, please contact your local 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