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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
(R)
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
PureBLACKTM
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
(R)
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
= 82.2C/W = 82.2C/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

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