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Maxim backlight controller powers CCFLs

Posted: 10 Mar 2004 ?? ?Print Version ?Bookmark and Share

Keywords:cold-cathode fluorescent lamp? ssfl? backlight controller? maxim integrated products? max8709?

Designed for powering cold-cathode fluorescent lamps (CCFLs), the integrated backlight controller from Maxim Integrated Products uses a resonant, full-bridge inverter architecture that maximizes striking capability and provides near-sinusoidal waveforms over the entire input range.

The MAX8709 controller operates over an input-voltage range of 4.6V to 28V with high power-to-light efficiency. It integrates safety features for protection against many single-point fault conditions, including lamp-out and short-circuit faults.

Suitable for notebook-computer displays, LCD TVs and monitors, and automotive displays, the device achieves a 10:1 dimming range by "chopping" the lamp current on and off using a digitally adjusted, pulse-width modulation (DPWM) method. The brightness is controlled with a 2-wire SMBus-compatible interface.

The device directly drives the full-bridge inverter's four external N-channel power MOSFETs. An internal 5.3V linear regulator powers the MOSFET drivers, the DPWM oscillator, and most of the internal circuitry.

The MAX8709 is available in a 28-pin TQFN package and operates over the -40C to 85C extended temperature range. Prices start at $4.80 (1000-up, FOB USA). To speed designs, a preassembled evaluation kit is also available with recommended external components.

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