HIGH-EFFICIENCY, WIDE-BRIGHTNESS RANGE CCFL BACKLIGHT CONTROLLERS
SUNNYVALE, CA-February 11, 2002-Maxim Integrated Products introduces the MAX1996A integrated controller optimized to drive cold-cathode fluorescent lamps (CCFLs) using synchronized full-bridge inverter architecture. Synchronized drive provides near sinusoidal drive waveforms over the entire input range to maximize the life of CCFLs. The controllers also operate over a wide input voltage range with high efficiency and a broad dimming range.
The MAX1996A includes safety features that limit the transformer secondary voltage and protect against single-point fault conditions, including lamp-out and short-circuit faults.
The MAX1996A regulates the CCFL brightness in three ways: linearly controlling the lamp current, digitally pulse-width modulating (DPWM) the lamp current, or using both methods simultaneously to achieve the widest dimming range (>30:1). CCFL brightness can be controlled with either an analog voltage or a 2-wire SMBus™-compatible interface.
The MAX1996A directly drives the four external N-channel power MOSFETs of the full bridge inverter. An internal 5.3V linear regulator powers the MOSFET drivers, the synchronizable DPWM oscillator, and most of the internal circuitry. The MAX1996 is available in the space-saving 28-pin QFN package and operates over the -40°C to +85°C temperature range. Prices for the MAX1996A start at $4.03 (1000-up FOB USA).
|
