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Microsemi Corp. (Nasdaq:MSCC), a leading manufacturer of power management integrated circuits, today announced that it has introduced two new AudioMAX(R) Class-D stereo amplifier controllers with next-generation power and performance characteristics.

Designated the LX1721/1722(TM) controllers, the new integrated circuits support full fidelity 20Hz-20kHz audio production and a standard output up to 65 watts (rms) per channel. Output power is determined by the choice of input voltage, external MOSFETs and speaker loads. The single input supply can be as low as seven volts, or as high as 25 volts.

With efficiency greater than 85% the new AudioMAX controllers remain cool, requiring no heat sinks in most applications that range from portable or battery-operated products to automotive amplifiers, multi-channel multimedia computer and video games, wireless speakers, home theatre/surround sound audio, computers and public address systems.

"These newest AudioMAX controllers typify the space and power-saving objectives common to most Microsemi product introductions today," commented Kelly Jones, vice president and general manager at Microsemi's power management division. "In addition to power and efficiency advantages, the LX1721/1722 solutions provide impressive sound quality. Their typical distortion plus noise rating is less than 0.06%," he said.

There are two controllers in the new AudioMAX series. The LX1721 is optimized for fidelity, uses a power supply of seven to 15 volts, and provides stereo output power up to 40 watts per channel. The LX1722 is optimized for power, providing stereo output up to 65 watts from a 25 volt supply. AudioMAX reference designs also show how it is possible to achieve an even greater output, with power exceeding well over 100 watts per channel.

Microsemi designers point out that creating a complete stereo amplifier is easy -- accomplished by combining an LX1721/22 controller with appropriate output power MOSFETs and an output filter. Microsemi offers two ready-to-play evaluation modules -- the LXE1721 and LXE1722 -- that require only a power source, speakers and input audio signals to test drive the new AudioMAX full-fidelity sound reproduction.

# posted by Medical Information : 4:58 AM