OZ968

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


Specifications

VDD                                       7.0 V                                  Logic inputs                  -0.3 V to VDD+0.3 V
GND                                 +/- 0.3 V
Storage temp.          -55 to 150
Operating temp.            0 to 70
Operating junction temp.   150


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, 150A in standby mode.

The OZ968 is available in a 16-pin SOP package.

OZ968 is specified over the commercial temperature range 0 to +70.