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High-Quality PWM Digital Power Amplifier from STMicroelectronics

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article image Digital Power Amplifier from ST Microelectronics

STMicroelectronics announced the addition of their recent product, a new digital power amplifier called the STA510F, within its digital power stage family of high-quality single-chip audio solutions. The STA510F is capable of driving up to 100 watts per channel of audio into stereo 8ohm loads. The device will also drive up to 200W in a mono-aural configuration.

The STA510F is intended to match other family devices that use STMicroelectronics' proprietary FFX (Full Flexible Amplification) digital modulation technology, but is also sufficiently flexible to accept signals from other drivers using any PWM modulation scheme such as ternary, phase shift or binary. The amplifier preserves the full audio quality of the PWM input signal, providing a cost-effective output stage for price-sensitive applications such as cinema systems and mini and micro-component audio systems.

In addition, the STA510F simplifies design and reduces the Bill-Of-Materials (BOM) cost by integrating the circuitry required for the critical turn-off sequence of the logic and the power-stage power supplies. STMicroelectronics' patented ‘Easy Start’ scheme eliminates the requirement for accurate control of the power-down sequence using external circuitry, thus ensuring easy use for audio system manufacturers and increased reliability.

The new amplifier is manufactured using state-of-the-art BiCMOS-DMOS process technology, which allows the integration of DMOS power, Bipolar and CMOS structures on the same chip. It is an ideal companion for the new STA330, a 2.0 channel PWM controller based on the patented FFX technology, and the STA331, a highly efficient and versatile FFX audio processor coupled with an ARM7TDMI core.

The FFX family offers high audio quality, lower power dissipation and reduced manufacturing costs for popular applications such as wireless products and personal and home audio systems. The high level of integration of these single-package solutions and their fully digital stream from sound source to loudspeaker, enables the design of cost-effective, high-efficiency, small form-factor sound systems.

“The addition of the STA510F to STMicroelectronics' audio power stage portfolio is a significant step forward in delivering high-quality digital amplification solutions for home system platforms,” said Andrea Onetti, General Manager, Audio Division. “More products in digital amplification will soon be launched by ST to meet the highly demanding audio interface standards required by the Blu-ray and HD-DVD high-definition DVD formats.”

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