Microsemi LX6503AID High performance ccfl controller Datasheet

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
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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 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
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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
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Additional Features
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LX 6503A Supports 400V PFC or 24V Inverter Applications
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AC Rectification, PFC, TV SMPS Voltages
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> 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
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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
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LX 6503A
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HV-LIPS Overall System Diagram
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frequency
> ENABLE control signal
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ratios (typical)
> JIN Balancer optimized to support
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dimming
> Industrial Temperature Grade
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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,
SOHDVHYLVLWZZZPLFURVHPLFRPRUFRQWDFWXVDW RU Microsemi Corporation, Analog Mixed Signal Group, 11861 Western Ave., Garden Grove, CA 92841 Ph: +1 (714) 898-8121
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