LX1692B ® TM Full Bridge Resonant CCFL Controller P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION 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. 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 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 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. 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 APPLICATIONS LCD TV LCD Monitor VSUPPLY LX1692B A I_R B C_BST C C_TO D Part DUAL FET Balancer C_R DUAL FET BRITE_IN EA_OUT ISNS LX1692B PACKAGE ORDER INFO TA (°C) -20 to +85 PW Plastic TSSOP 20-Pin DW Plastic SOIC 20-Pin RoHS Compliant / Pb-free RoHS Compliant / Pb-free LX1692BIPW LX1692BIDW Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1692BIPW-TR) 1 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 Page 1 TM ® 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: [email protected] 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 WWW . Microsemi .C OM INFORMATION