General Description

The MAX8722 integrated backlight controller is optimized to drive cold-cathode fluorescent lamps (CCFLs) using a full-bridge resonant inverter architecture. Resonant operation maximizes striking capability and provides near-sinusoidal waveforms over the entire input range to improve CCFL lifetime. The controller operates over a wide input voltage range (4.6V to 28V) with high power to light efficiency. The device also includes safety features that effectively protect against many single-point fault conditions including lamp-out and short-circuit faults.

Features

♦ Synchronized to Resonant Frequency

    Longer Lamp Life

    Guaranteed Striking Capability

    High Power to Light Efficiency

♦ Wide Input Voltage Range (4.6V to 28V)

♦ Input-Voltage Feed-Forward for Excellent Line Rejection

♦ Accurate Dimming Control with Analog Interface

♦ 10:1 Dimming Range

♦ Adjustable Accurate DPWM Frequency with Sync Function

♦ Adjustable Lamp Current Rise and Fall Time

♦ Secondary Voltage Limit Reduces Transformer Stress

♦ Lamp-Out Protection with Adjustable Timeout

♦ Secondary Overcurrent Protection with Adjustable Timeout

♦ Low-Cost 24-Pin QSOP Package

Applications

    Notebook Computer Displays

    LCD Monitors

    LCD TVs