OZ968

OZ968 SMBus Smart Inverter Controller FEATURES Single-stage power conversion Constant frequency design eliminates interference with LCDs Built-in open-lamp protection and shortcircuit protection Reliable 2-winding transformer design eliminates arcing failures and the need for foldback wiring 32-level dimming and 256-level contrast control via SMBus High efficiency, 90% typical Supports both floating secondary and grounded secondary designs GENERAL DESCRIPTION The OZ968 is a unique single-stage, highefficiency, CCFL backlight controller. It drives a zero-voltage-switching circuit and provides a near sinusoidal output voltage and current waveforms for a CCFL backlight. Typical operating frequency ranges from 30KHz to 100KHz. These advances drive the OZ968 beyond comparable conventional inverter designs with two power conversion stages (one operates at a variable frequency, the other at a constant frequency). Operating in a PWM push-pull drive, the transformer in an OZ968 backlight inverter requires only one primary winding and one secondary winding. The secondary winding requires no foldback treatment. The OZ968 supports a bi-directional, two-wire bus, data transmission protocol to control dimming (32 levels) and contrast (256 levels). Supply current is 1mA in active mode, 150µA in standby mode. The OZ968 is available in a 16-pin SOP package. It is specified over the commercial temperature range 0oC to +70oC. ORDERING INFORMATION OZ968G - 16-pin plastic SOP TYP...