Amplifiers deliver 90% power efficiency for automotive audio

8 February 2006 Power Electronics / Power Management

Ushering in a higher standard in car audio, Texas Instruments has released its first digital amplifiers designed to meet the high reliability and unique requirements of the automotive market.

The TAS5414 and TAS5424 Class D amplifiers introduce the power efficiency of digital amplification for automotive audio applications, such as head units and external amplifiers.

Specifically designed for the automotive market, the TAS5414 is a single-ended input amplifier and the TAS5424 has differential input, enabling it to achieve higher dynamic range performance in a challenging board signal routing environment. The two amplifiers let the designer select the optimum solution, given their system performance and cost requirements.

These digital amplifiers are ultra-efficient 4-channel digital audio Class D amplifiers. At moderate power levels, Class A/B amplifiers provide at most 40-50% efficiency. With the TAS54x4 amplifiers, TI delivers 90% power efficiency at normal radio listening levels for automotive audio systems, according to the company.

Comparatively, two TAS54x4 amplifiers can provide eight channels of audio, while generating less heat than a 4-channel Class A/B-based system. This, says TI, enables a whole new class of cost-effective 8-channel audio systems that are lighter, smaller and more power efficient than existing systems.

EMI performance is important. TI overcomes EMI at the source through innovative architecture and process advancements, such as an enhanced digital PWM topology, optimised gate drive technology and AM interference avoidance. This eliminates the need for expensive shielding and other EMI countermeasures.

The TAS5414IDKD comes in a 36-pin PSOP3 and the TAS5424IDKD in a 44-pin PSOP3.

See www.ebg.co.za for local distributors for Texas Instruments.

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