LX6503
TM
®
H
IGH
P
ERFORMANCE
CCFL C
ONTROLLER
P
RODUCTION
D
ATASHEET
KEY FEATURES
•
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
LCD-TV
Multi-Lamp LCD Monitors
CCFL, EEFL, FFL Backlight
Systems
DESCRIPTION
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
PACKAGE ORDER INFO
THERMAL DATA
T
A
(°C)
-40 to 85
DW
Plastic SOWB 16 Pin
RoHS Compliant / Pb-free
θ
J
A
= 69.1
°C/W
THERMAL RESISTANCE
-
JUNCTION TO AMBIENT
LX6503IDW
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX6503IDW-TR)
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.
T
A
(°C)
-40 to 85
PW
Plastic TSSOP 16 Pin
RoHS Compliant / Pb-free
θ
J
A
= 105.6
°C/W
THERMAL RESISTANCE
-
JUNCTION TO AMBIENT
LX6503
LX6503
LX6503IPW
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.
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX6503IPW-TR)
Copyright
©
2008
Rev. 1.1, 2009-05-07
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
TM
®
WWW .
Microsemi
.C
OM
INFORMATION
Thank you for your interest in Microsemi
®
Analog Mixed Signal products.
The full data sheet for this device contains proprietary information.
To obtain a copy, please contact your local Microsemi sales representative. The
name of your local representative can be obtained at the following link
http://www.microsemi.com/contact/contactfind.asp
or
Contact us directly by sending an email to:
IPGdatasheets@microsemi.com
Be sure to specify the data sheet you are requesting and include your company
name and contact information and or vcard.
We look forward to hearing from you.
Copyright
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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