LX1692

Microsemi

Integrated Products Division

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

Page 1

Copyright

© 2004

Rev. 1.2, 12/20/2006

Full Bridge Resonant CCFL Controller

TM

®

DE SCRI PT I ON

Microsemi’s LX1692 is a cost

reduced, third generation Direct Drive

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. This new archi-

tecture also provides a wide dimming

range.

The

LX1692

includes

safety

features that limit the transformer

secondary voltage and protect against

fault conditions which include open

lamp, broken lamp and short-circuit

faults.

The LX1692 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 LX1692 can accept a brightness

control signal that is either an analog

voltage or a direct low frequency PWM.

The LX1692 also features integrated

gate drivers for the four external power

MOSFETs.

An integrated 4V LDO powers all

internal control circuitry which greatly

simplifies supply voltage requirements.

The LX1692 is available in a 20-Pin

TSSOP and SOIC.

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

PRODUCT HIGHLIG HT

Part

C_R

I_R

C_BST

C_TO

BRITE_IN

EA_OUT

ISNS

D

C

B

A

DUAL

FET

DUAL

FET

V

SUPPLY

LX1692

KEY FEATURES

For Wide Voltage Range Inverter

Application (7V to 22V)

Patent Resonant Strike for

Unsurpassed Striking Power

Combined with Best Efficiency

Low Stress to Transformers

Excellent Open Circuit Voltage

Regulation Reduces Transformer

Breakdown Voltage

Requirements While Striking

Higher Voltage Lamps

One Inverter for Multiple Panel

Types

Wide Dimming Range

Analog Dimming: >3 to 1

Digital Dimming : >20 to 1

Combined: >60 to 1

Fool-Proof Striking

Programmable Burst Dimming

Frequency

Programmable Time Out

Protection

Fixed Operating Frequency

Open Lamp Voltage Protection,

Short Lamp Protection, Arc

BENEF I TS

Even Display Light Distribution

Longer Lamp Life with Optimized

Lamp Current Amplitude

Reduced Operating Voltage

Lowers Corona Discharge and

Prolongs Module Life

High “Nits / Watt” Efficiency

Makes Less Heat and Brighter

Displays

APPL ICA T ION S

LCD TV

LCD Monitor

PACKAG E ORDER INFO

PW

Plastic TSSOP

20-Pin

DW

Plastic SOIC

20-Pin

RoHS Compliant / Pb-free

RoHS Compliant / Pb-free

-20 to +85

LX1692IPW

LX1692IDW

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1692IPW-TR)

1

Arc protection is provided if the arcing level is enough to be trigged.