LX6503A Datasheet, PDF (1/2 Pages) Microsemi Corporation – High Performance CCFL Controller

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^TM 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
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simple external circuitry.
An on-chip regulator supplies both the operating voltage for the output gate drive and bias to the internal control
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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 PureBLACK^TM 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
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Key Features
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400V Off-PFC HV-LIPS Support
> Half-bridge or Full-Bridge drive support for inverters
Integrated JIN’s PureBLACKTM Mega Dimming
> Supports BURST PWM dimming for ‘true zero’ percent
duty cycle operation
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
Multiple Drive Topologies Supported
> Push-Pull, Half-bridge, and Full-bridge
> 600mA sourcing or sinking gate drivers
Optimal System Cost and Increased Efficiency
> Reduced number of power stages increase efficiency at a
reduced overall system BOM – easier regulatory agency compliance
Enhanced Image Quality and more Realistic Video
> Superior black levels for increased dynamic contrast ratio
> Great shadow detail for a more enjoyable viewing experience
Increased Flexibility and Performance
> Wide dimming range and multiple architecture support
> Ease of implementation
> Reduced cost with reduction of external components
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