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CCFL backlight controller provides fault protection

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MAXIM Integrated Products, represented by Arrow Electronics Australia Pty Ltd , has introduced an integrated inverter controller, the MAX8759.

It is designed to drive cold-cathode fluorescent lamps (CCFLs) using a full-bridge resonant inverter for maximum efficiency.

Input power is converted to light with high efficiency. Safety features effectively protect against single-point fault conditions such as lamp-out, secondary overvoltage and secondary short-circuit faults.

Brightness is controlled through three mechanisms: a 2-wire SMBus-compatible interface, an external ambient light sensor (ALS), or system PWM control.

The MAX8759 provides ±2.5% accurate lamp-current regulation, adjustable with an external resistor, for superior CCFL inverter performance.

A 10:1 dimming range can be achieved by turning the CCFL on and off using a digital pulse-width modulation(DPWM) method, while maintaining the lamp current constant.

The MAX8759 supports Intel display power-saving technology (DPST) to maximise battery life and includes two lamp-current feedback input pins that support dual-lamp applications with a minimum number of external components.

An internal 5.35V linear regulator powers most of the internal circuitry and the MOSFET driver, which directly drives four external n-channel power MOSFETs. The resonant operation ensures reliable striking and provides near-sinusoidal waveforms over the entire 4.5V to 28V input range.

The MAX8759 is available in a space-saving (5mm x 5mm), low-profile (0.8mm), 28-pin thin QFN package and operates over the -40°C to +85°C temperature range.

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