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MAX8709B Datasheet High-efficiency Ccfl Backlight Controller

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: MAX8709B High-Efficiency CCFL Backlight Controller with SMBus Interface.

General Description

The MAX8709B integrated backlight controller is optimized to drive cold-cathode fluorescent lamps (CCFLs) using a resonant full-bridge inverter architecture.

The 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 of 4.6V to 28V with high power-to-light efficiency.

Key Features

  • that effectively protect against many single-pointfault conditions including lamp-out and short-circuit faults. The MAX8709B achieves 10:1 dimming range by “chop- ping” the lamp current on and off using a digital pulse- width-modulation (DPWM) method. The minimum DPWM duty cycle of the MAX8709B is 12.5%. The brightness is controlled with a 2-wire SMBus-compatible interface. The device directly drives the four external N-channel power MOSF.

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MAX8709B Distributor