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 PureBLACK KTMM Megacontr 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 GULYHVLJQDOV7KHRXWSXWGULYHUVFDQGULYHDSXVKSXOOKDOIEULGJHRUIXOOEULGJH&&)/LQYHUWHUFRQ¿JXUDWLRQZLWKWKHDGGLWLRQRI simple external circuitry. An on-chip regulator supplies both the operating voltage for the output gate drive and bias to the internal control FLUFXLWU\7KLVDOORZVDGLUHFWFRQQHFWLRQRIWKHFRQWUROOHUWRWKHV\VWHPVXSSO\H[WHQGLQJWKHYROWDJHXSWR9ZLWKRXWH[WHUQDO UHJXODWRUV7KHODPSFXUUHQWUHJXODWLRQFLUFXLWFRPSULVHVDVLPSOHDQGUREXVWFRQWUROORRSGHVLJQZLWKJRRGUHJXODWLRQDFFXUDF\DQG G\QDPLF UHVSRQVH DW WUDQVLHQW FRQGLWLRQV$ VRIW VWDUW IHDWXUH SURYLGHV PRUH UHOLDEOH ODPS VWULNH DQG DOORZV HIIHFWLYH FRQWURO 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 VWULNHDQGSURWHFWLRQWLPLQJDQGIDXOWLQGLFDWLRQDUHDOOEXLOWLQZLWKWKHYHU\FRPSDFWFKLSGHVLJQ7KHGHYLFHLVDYDLODEOHLQD OHDGQDUURZERG\62,&VXUIDFHPRXQWSDFNDJHZLWKDQLQGXVWULDOWHPSHUDWXUHJUDGHUDWLQJ %HQH¿WV Key Features 400V Off-PFC HV-LIPS Support Optimal System Cost and Increased Efficiency > Half-bridge or Full-Bridge drive support for inverters > Reduced number of power stages increase efficiency at a reduced overall system BOM – easier regulatory agency compliance Integrated JIN’s PureBLACKTM Mega Dimming Enhanced Image Quality and more Realistic Video > Supports BURST PWM dimming for ‘true zero’ percent duty cycle operation > Superior black levels for increased dynamic contrast ratio > Great shadow detail for a more enjoyable viewing experience Comprehensive Brightness Control Modes Increased Flexibility and Performance > Analog only @ adjust lamp current only > Analog BURST Dimming @ analog voltage to BURST PWM > Digital BURST Dimming @ Direct PWM BURST input Multiple Drive Topologies Supported > Push-Pull, Half-bridge, and Full-bridge > Wide dimming range and multiple architecture support > Ease of implementation > Reduced cost with reduction of external components Ease of Use and Flexibility > 600mA sourcing or sinking gate drivers > One device supports multiple inverter architectures and applications > Reduces cost by eliminating need for high current external buffer Lamp Frequency Synchronization - SYNC Improved Versatility/Performance with Reduced Cost > Auto sync signal detection to lower or higher external frequency with min/max limiting and frequency hold > Improved image quality with reduced beat frequency artifacts > Integration reduces cost while supporting multiple formats/sources Protection, Lamp Strike, Detection, and Operation Reliability, Flexibility, Ease of Use, and Reduced Cost > OLP, OVP (regulation/protection), OIP and Short Circuit > Programmable STRIKE and Fault time (run mode) > Programmable STRIKE frequency > 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 6LPSOLÀHG%ORFN'LDJUDP Additional Features !9WR9SRZHUUDLORSHUDWLRQ ® LX 6503A Supports 400V PFC or 24V Inverter Applications 9DEVROXWHPD[LPXP AC Rectification, PFC, TV SMPS Voltages !2QFKLSYROWDJHUHJXODWRU :LWK89/2SURWHFWLRQ325 > Soft Start Control OR CCFL LAMPS 400V PFC Inverter Supply Inverter Transformer POWER INPUT POWER STAGE A_OUT VDD Regulator Control / Reset PWM DRIVER PWM Steering Shut Down B_OUT CONTROL PROTECTION AC+ ISOLATION, DRIVE and POWER Stage Circuitry AC- PWM_DIM > Highly accurate lamp operation &XUUHQWFRQWURO @ ANALOG_DIM PureBLACK™ SYNC Megacontrast Dimming Voltage Sense Current Sense Soft Start COMP Fault ENABLE FREQUENCY SYNC ENABLE RS1 VSNS Voltage and Current Sensing RS2 ISNS JIN Current Balancing 24V Inverter Supply VIN ISNS L1B1 L1B2 CCFL LAMPS L1B1 )UHTXHQF\VHW @ L1B2 ® LX 6503A ! 3URJUDPPDEOH675,.(WLPHDQG 675,.(IUHTXHQF\ ! 3URJUDPPDEOH)$8/7WLPH HV-LIPS Overall System Diagram !3URJUDPPDEOH%8567GLPPLQJ frequency > ENABLE control signal ! 6XSSRUWV6WULNH5XQIUHTXHQF\ ratios (typical) > JIN Balancer optimized to support µWUXH¶]HUR%8567GXW\F\FOH dimming > Industrial Temperature Grade &WR& ! OHDGQDUURZERG\62,& Ordering Information LX6503AID SOIC, 16 lead, Narrow Body, RoHS compliant, Pb-free, Industrial Temperature, Tubes LX6503AID – TR SOIC, 16 lead, Narrow Body, RoHS compliant, Pb-free, Industrial Temperature, Tape and Reel @ 2500 pcs/reel eJA = 82.2°C/W eJA = 82.2°C/W Technical Support Information: )RU/;$/;$DQGRWKHU&&)/RU'LVSOD\IDPLO\RISURGXFWVSOHDVHFRQWDFW\RXUORFDO Microsemi Field Applications Engineer. For more information about Microsemi products and the name of a local representative, distributor or sales person, SOHDVHYLVLWZZZPLFURVHPLFRPRUFRQWDFWXVDWRU Microsemi Corporation, Analog Mixed Signal Group, 11861 Western Ave., Garden Grove, CA 92841 Ph: +1 (714) 898-8121