LX1692F

Microsemi

Analog Mixed Signal Group

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

Page 1

Full Bridge Resonant CCFL Controller

TM

®

Copyright

© 2008

Rev. 1.0, 8/28/2008

DESCRIPTION

Microsemi’s LX1692F is a cost

reduced, third generation CCFL (Cold

Cathode Fluorescent Lamp) controller.

The integrated controller is optimized

to drive CCFL’s using resonant full

bridge inverter topology.

Resonant full bridge topology

provides near sinusoidal waveforms

over a wide supply voltage range in

order to maximize the life of CCFL

lamps, control EMI emissions, and

maximize efficiency.

The

LX1692F

includes safety

features that limit the transformer

secondary voltage and protect against

fault conditions which include open

lamp, and broken lamp faults.

The LX1692F regulates the CCFL

brightness in three ways: analog

dimming, digital dimming, or combined

analog and digital dimming methods

simultaneously to achieve the widest

dimming range (> 60 to 1).

The

LX1692F

can

accept

a

brightness control signal that is either

an analog voltage or a low frequency

PWM.

The

LX1692F

also

features

integrated gate drivers for the four

external power MOSFETs.

An integrated 4V LDO powering all

internal

control

circuitry

greatly

simplifies supply voltage requirements.

The LX1692F is available in either a

20-Pin TSSOP or SOIC package.

IMPORTANT:

Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; 7,112,929; Patents Pending

PRODUCT H I GHLIGHT

KEY FEATUR ES

Low Stress to Transformers

Wide Dimming Range

Analog Dimming: > 3 to 1

Digital Dimming : > 20 to 1

Combined: > 60 to 1

Programmable Burst Dimming

Frequency

Programmable Time-Out

Protection

Fixed Operating Frequency

Open-Lamp Voltage Protection

Soft Rise/Fall Burst Dimming

Control

3% Tolerance Brightness

Reference Voltage

BENEFITS

Even Display Light Distribution

Longer Lamp Life with Optimized

Lamp Current Amplitude

Reduced Operating Voltage

Lowers Corona Discharge and

Prolongs Inverter Life

High “Nits / Watt” Efficiency

Makes Less Heat and Brighter

Displays

APPLICATIONS

LCD TV

LCD Monitor

PACKAGE ORDER INFO

PW

Plastic TSSOP

20-Pin

DW

Plastic SOIC

20-Pin

RoHS Compliant / Pb-free

RoHS Compliant / Pb-free

-20 to +85

LX1692FIPW

LX1692FIDW

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1692FIPW-TR)