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Digital Audio Amplifier Power Stage is first to Drive more than 300W on a Single Channel

3rd October 2006

ES Admin

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Texas Instruments has introduced two new PurePath DigitalT power stages. The TAS5261 provides OEMs with the industry's highest power single-chip digital amplifier power stage, capable of driving more than 300 watts (W) into a 4-ohm speaker, while the two-channel TAS5162 digital amplifier power stage can drive 200 W per channel at 6 ohms and 125 W at 8 ohms. The devices enable higher efficiency and sound quality in a variety of audio applications, including many previously restricted from using digital amplifiers due to power requirements, such as high-end DVD receivers and mid- to high-end audio/video receivers (AVRs).

Existing 300-W systems (4 ohms) such as AVRs have had to utilize less efficient Class-AB amplifiers or modules due to power and current limitations of available digital audio power stages. Now, with the

TAS5162 and TAS5261 single-chip power stages, designers can leverage TI's industry-leading Class-D technology, which offers an efficiency of greater than 95 percent and signal-to-noise ratio (SNR) of 110 dB. The TAS5261 features total harmonic distortion plus noise (THD+N) of less than 0.09 percent THD+N at 125 W (8 ohms). The TAS5162 can drive two channels simultaneously at 200W. These enable a cooler-running system that uses less energy, while increasing performance and sound clarity.

In addition, unlike other high-power digital amp or Class-D solutions, the single-chip devices eliminate discrete components such as MOSFET H-bridges, reducing board size, easing layout, simplifying heat sink

design and lowering manufacturing costs.

The TAS5162 power stage is also pin-compatible with earlier TAS51x2 devices, enabling OEMs to design a single board that can drive 100 W (TAS5142), 125 W (TAS5152), or 200 W (TAS5162) per channel, eliminating multiple designs and simplifying logistics. Similar to the TAS5152 and TAS5142, these new power stages include improved gate drive technology, as well as cycle-by-cycle, two-stage over-current and under-voltage detection.

The TAS5162 and TAS5261 digital amplifier power stages are part of TI's PurePath Digital technology, which allows consumer electronics manufacturers to build completely digital, end-to-end audio products with cutting-edge sound reproduction and the most lifelike sound in a compact form factor. By reproducing movie soundtracks or music exactly the way the artist intended, PurePath Digital technology offers high-end digital entertainment to the everyday consumer. PurePath Digital

technology complements TI's complete signal chain for audio applications, including digital and high-performance analog products such as digital signal processors (DSPs), switch mode power management,

analog Class-D amplifiers and audio converters.

The TAS5261 300-W digital amplifier power stage is available today in volume in PSOP-3 packaging at $5.25 each in quantities of 1,000 or more. The TAS5162 200-W stereo digital amplifier power stage, available in both PSOP-3 and HTSSOP packaging, is slated for volume production by

December.