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Description

The OZ9938GN is a high performance, cost-effective CCFL (Cold Cathode Fluorescent Lamp) controller designed for driving large-size Liquid Crystal Display(LCD) applications requiring 2 to 6 CCFLs.

The controller converts unregulated DC voltages into a nearly sinusoidal lamp voltage and current waveforms. The control logic provides a regulated ignition voltage and appropriate protection features for over-voltage or over-current conditions.

The OZ9938 offers a high level of integration, while maintaining flexibility and high-efficiency operation that reduces external component heating, resulting in higher reliability and longer CCFL life. The proprietary design technique provides a simple, low-cost system solution.

Block Diagram

Features

1. Positive PWM dimming polarity

2. Constant operating frequency

3. Drives positive/negative-impedance lamps during ignition

4. High drive current for external MOSFETs

5. User-defined ignition time and shutdown delay time

6. Multiple mode dimming control