LX6503

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

TM

®

Copyright

© 2008

Rev. 1.1, 2009-05-07

DESCRIPTION

KEY FEA T URES

• 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

APPLICA T IONS

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.

LCD-TV

Multi-Lamp LCD Monitors

CCFL, EEFL, FFL Backlight

Systems

Patents Pending

PACKAGE ORDER INFO

THERMAL DATA

DW

Plastic SOWB 16 Pin

θ

J

RoHS Compliant / Pb-free

THERMAL RESISTANCE

-40 to 85

LX6503IDW

Note: Available in Tape & Reel. Append the letters “TR” to the part number.

(i.e. LX6503IDW-TR)

The

θ

device/pc-board system. All of the above assume no ambient airflow.

PW

Plastic TSSOP 16 Pin

θ

J

RoHS Compliant / Pb-free

THERMAL RESISTANCE

-40 to 85

LX6503IPW

The

θ

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)