LX6503 Datasheet, PDF (1/2 Pages) Microsemi Corporation – TM HIGH PERFORMANCE CCFL CONTROLLER

LX6503
®
TM
HIGH PERFORMANCE CCFL CONTROLLER
PRODUCTION DATASHEET
DESCRIPTION
KEY FEATURES
The LX6503 is a high performance
CCFL controller optimized for LCD-TV
and other multi-lamp LCD display
systems. It particularly provides a cost
competitive solution for off-PFC inverter
applications.
The controller provides a pair of push-
pull PWM drive signals with adequate
capacity to drive a push-pull, half bridge,
or full bridge CCFL inverter
configuration with 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
circuitry. This allows a direct
connection of the controller to the
system supply extending the voltage up
to 27V without external regulators.
In addition the controller includes a
synchronization capability that allows
the user to synchronize both the
frequency and phase of the lamp current
between inverters or to an external
synchronization signal.
The lamp current regulation circuit
comprises a simple and robust control
loop design with good regulation
accuracy and dynamic response at
transient conditions. Furthermore a soft
start feature provides more reliable lamp
strike and allows effective control of the
possible inverter start up surge current
and lamp current/voltage overshoot.
Lamp dimming operation is also
well considered to facilitate convenient
and flexible dimming control design
with synchronization capability.
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 strike and
protection timing, and fault indication
are all built-in with the very compact
chip design.
The device is available in the 16 lead
TSSOP and SOIC wide body surface
mount packages in the industrial
temperature range.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Patents Pending
• Push-Pull Output to Provide Low
Cost Solution for Multiple
Topology Configuration
• 0.6A Peak Source and Sink Drive
Current
• 6V to 27V Power Rail operation
(36V Absolute Maximum)
• On Chip Regulator with Under
Voltage Lock Out Protection
• Inverter Operating Frequency
Synchronization
• Soft Start Control
• Programmable Strike Time, Fault
Time, Strike Frequency, and Burst
Dimming Frequency
• Comprehensive Brightness
Control Modes
• Provide Optimized Solution for Off
PFC Inverter Applications
APPLICATIONS
ƒ LCD-TV
ƒ Multi-Lamp LCD Monitors
ƒ CCFL, EEFL, FFL Backlight
Systems
PACKAGE ORDER INFO
T_A (°C) ^DW
Plastic SOWB 16 Pin
RoHS Compliant / Pb-free
-40 to 85
LX6503IDW
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX6503IDW-TR)
T_A (°C) ^PW
Plastic TSSOP 16 Pin
RoHS Compliant / Pb-free
-40 to 85
LX6503IPW
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX6503IPW-TR)
THERMAL DATA
θ_JA = 69.1 °C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT
Junction Temperature Calculation: T_J = T_A + (P_D x θ_JA).
The θ_JA numbers are guidelines for the thermal performance of the
device/pc-board system. All of the above assume no ambient airflow.
θ_JA = 105.6 °C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT
Junction Temperature Calculation: T_J = T_A + (P_D x θ_JA).
The θ_JA numbers are guidelines for the thermal performance of the
device/pc-board system. All of the above assume no ambient airflow.
Copyright © 2008
Rev. 1.1, 2009-05-07
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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