LX1692B Datasheet | Microsemi

DESCRIPTION KEY FEATURES . 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 bined 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 bined: >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://.microsemi. Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234;...