General Description

The MAX8759 integrated cold-cathode fluorescent lamp (CCFL) inverter controller is designed to drive CCFLs using a full-bridge resonant inverter. The resonant operation ensures reliable striking and provides near-sinusoidal waveforms over the entire input range. The controller operates over a wide input-voltage range of 4.5V to 28V with high power to light efficiency. The device also includes safety features that effectively protect against single-point fault conditions such as lamp-out, secondary overvoltage, and secondary short-circuit faults.

Features

♦ Accurate Dimming Control Using SMBus, PWM Interface, or Ambient Light Sensor

♦ 10:1 Dimming Range with 256-Step Resolution

♦ Resonant-Mode Operation

Longer Lamp Life with Near Sinusoidal Lamp

Current Waveform

Guaranteed Striking Capability

High-Power-to-Light Efficiency

♦ Wide Input-Voltage Range (4.5V to 28V)

♦ Input Feed-Forward for Excellent Line Rejection

♦ ±2.5 Lamp-Current Regulation

♦ Adjustable 1.5 Accurate DPWM Frequency

♦ Dual Lamp-Current Feedback Inputs

♦ Comprehensive Fault Protection

Secondary Voltage Limiting

Primary Current Limit with Lossless Sensing

Lamp-Out Protection with Adjustable Timeout

Secondary Short-Circuit Protection

♦ Small 28-Pin, 5mm x 5mm, Thin QFN Package

Applications

Notebooks

LCD Monitors

Automotive Infotainment