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200V audio power amp tipped for high-end apps

Posted: 17 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:audio power amplifier? power transistors? stereo driver?

National Semiconductor Corp. introduces a pair of 200V mono audio power amplifier input stages, which the company claims reduce design time and enable amplifier designs with a THD+N as low as 0.00035 percent. The highly integrated single-chip LME49811 and LME49830 are intended to address high-end consumer and professional audio applications, as well as a wide range of industrial applications where high voltage and low distortion are required.

The devices contain all the essential circuitry required for a high-quality, high-performance power amplifier input stage. According to the company, they save board space and design time by replacing more than 25 discrete components (many of which must be hand selected and matched by the audio system designer) in high-power audio amplifiers, enabling designs with more channels and more power per square-inch of chassis space.

The LME49811 is a mono version of the company's LM4702 stereo driver, and drives Darlington or bipolar power transistors in an amplifier's output stage. It can easily attain slew rates of 40V/?s, while providing 9mA output drive current and 100?V of output voltage noise.

The LME49830 is optimized to drive a wide range of MOSFETs with standard and low threshold voltages. The device has 60mA of output current capability and provides slew rates of 40V/?s, and an output voltage noise of 41?V.

Both devices have an operating voltage range of 20V to 100V and are capable of driving transistors in an amplifier's output stage to deliver in excess of 500W single-ended into an 8? load. Other features include a PSRR of 115dB and thermal shutdown protection.

The LME49811 and LME49830 can be used in the same base circuit design to create multiple power-level solutions up to 1kW amplifiers by scaling the output stage devices to accommodate for more power dissipation and current drive. When implemented in a complete power amplifier design, the LME49811's THD+N is only 0.00035 percent, while the LME49830's THD+N is 0.0006 percent.

The LME49811 and LME49830 are available now in 15-lead TO-247 packages and both are priced at $3.33 in 1,000-unit quantities.

- Rich Pell
Audio DesignLine

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