PD_LX1692B_rev1| Datasheet

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LX1692B
TM

Full Bridge Resonant CCFL Controller
P RODUCTION D ATA S HEET

DESCRIPTION

KEY FEATURES

WWW . Microsemi .C OM

Microsemi's LX1692B 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. This new architecture also provides a wide dimming range. The LX1692B 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 LX1692B 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 LX1692B can accept a brightness control signal that is either an analog voltage or a low frequency PWM. The LX1692B also features integrated gate drivers for the four external power MOSFETs. An integrated 4V LDO powers all internal control circuitry greatly simplifying supply voltage requirements. The LX1692B is available in a 20Pin TSSOP and SOIC.

For Wide Voltage Range Inverter Application (7V to 22V) 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, Short Lamp Protection, Arc Protection1

BENEFITS
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

IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; 7,112,929; Patents Pending

PRODUCT HIGHLIGHT

APPLICATIONS
LCD TV LCD Monitor

VSUPPLY

LX1692B
C_R I_R C_BST C_TO A B C D ISNS
DUAL FET

Part

DUAL FET

BRITE_IN EA_OUT

Balancer

LX1692B LX1692B

PACKAGE ORDER INFO

TA ( C) -20 to +85
1

PW

Plastic TSSOP 20-Pin LX1692BIPW

DW

Plastic SOIC 20-Pin LX1692BIDW

RoHS Compliant / Pb-free

RoHS Compliant / Pb-free

Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX1692BIPW-TR)

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

Copyright 2005 Rev. 1.1, 12/20/2006

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

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