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| LX1696A TM (R) Full Bridge Resonant CCFL Controller PRODUCTION DATA SHEET DESCRIPTION Microsemi's LX1696A is a full bridge resonant controller designed specifically for Automotive and high performance display applications. The Direct Drive CCFL (Cold Cathode Fluorescent Lamp) controller is optimized to provide the functions, efficiency, and safety features critical to vehicular applications while providing major advancements in overall component count and costs at the system level. 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 LX1696A includes safety features that limit the transformer secondary voltage and protect against fault conditions which include open lamp, broken lamp, and short-circuit faults. In addition to this protection the LX1696A provides integrated fault indicator and shutdown features necessary in automotive environments. Integration of these functions provides significant reductions in required external support components. The LX1696A 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 as well as optimizing the display performance in temperature extremes. The LX1696A can accept a brightness control signal that is either an analog voltage1 or a direct low frequency PWM. The LX1696A 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 LX1696A is available in a 20-Pin TSSOP in extended temperature range. KEY FEATURES For Wide Voltage Range Inverter Application (7V to 22V) Patent Resonant Lamp Strike for Unsurpassed Striking Power Combined with Best Efficiency Reduced Corona Stress To Transformers Wide Dimming Range * Direct Low PWM Brightness Control Input Provides > 300:1 Capability * DC Brightness Control Input Provides > 80:1 capability Programmable Burst Dimming Frequency Programmable Time Out Protection Fixed Operating Frequency Open Lamp Voltage Protection, Short Lamp Protection, Arc 2 Protection Compatible with Existing Transformers 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 Automotive Industrial Application Avionics Marine WWW .Microsemi .C OM 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; Patents Pending PACKAGE ORDER INFO LX1696A LX1696A TA (C) -40 to +85 PW Plastic TSSOP 20-Pin LX1696AIPW RoHS Compliant / Pb-free Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX1696AIPW-TR) 1 With Analog DC voltage, it will limit the dimming ratio. 2 Arc protection is provided if the arcing level is enough to be trigged Copyright (c) 2004 Rev. 1.0, 2006-03-29 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 TM (R) WWW .Microsemi .C OM INFORMATION Thank you for your interest in Microsemi(R) IPG 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: IPGdatasheets@microsemi.com 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 Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 |
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