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Audio power amp targets automotive warning systems

Posted: 22 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:audio power amplifier? warning amplification? automotive application?


From National Semiconductor Corp. comes a power amplifier touted to be the first monolithic amplifier for automotive warning and alert tone amplification. The LM48100Q amplifies warning tones in automobile driver warning systems such as signal change, back up warning and collision avoidance.

The LM48100Q boomer audio power amplifier is AEC-Q100 Grade 2 qualified for operation between -40C and 105C. The mono 1.3W amplifier includes several features not available in competitive devices to ensure that the speaker and amplifier always operate:
??Open drain FAULT output indicates when a fault has occurred
??Comprehensive output short circuit and thermal overload protection prevents damage during a fault condition

The amplifier also offers dual audio inputs that can be mixed and multiplexed to the device output, with each path having its own independent 32 step volume control. With its low quiescent current of 6mA at 5V, this audio power amplifier is a member of National's growing PowerWise family of energy-efficient products.

The LM48100Q is a single-supply, mono bridge-tied load amplifier with I?C-compatible volume control. The device includes a comprehensive output fault detection system that senses the load conditions, protecting the device during short circuit events, as well as detecting open circuit conditions. Operating from a single 5V supply, the LM48100Q delivers 1.3W of continuous output power to an 8? load with less than one percent total harmonic distortion plus noise (THD+N).

The LM48100Q's flexible power supply requirements allow operation from 3V to 5.5V. The amplifier's high power supply rejection ratio of 74dB at 1kHz allows the device to operate in noisy environments without additional power supply conditioning. A low power shutdown mode reduces supply current consumption to 0.01?A. The amplifier's advanced "pop-and-click" circuitry eliminates noise that typically occurs during turn-on and turn-off transitions and during shutdown.

The LM48100Q is available in a 14-pin TSSOP package for $1.50 each in 1,000-unit quantities.

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