LX1692B

www.DataSheet4U.com TM ® LX1692B 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. ƒ For Wide Voltage Range Inverter Application (7V to 22V) ƒ Low Stress to Transformers ƒ Wide Dimming Range Analog Dimming: >3 to 1 Digital Dimming : >20 to...