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NXP claims breakthrough Class-AB and Class-D audio amplifiers for start-stop systems

November 14, 2011 // Paul Buckley

NXP claims breakthrough Class-AB and Class-D audio amplifiers for start-stop systems

NXP Semiconductors N.V. has introduced two new automotive audio amplifiers supporting energy-saving start-stop systems the TDF8530 and TDF8546. The TDF8530 is an ultra-efficient quad-channel Class-D audio amplifier supporting the 6 V requirement for start-stop vehicles.

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The TDF8546 is a quad-channel Class-AB amplifier available with a groundbreaking Best Efficiency Mode operating as low as 6 V, reducing power dissipation by 17 percent compared to other high-efficiency solutions in its class. Both amplifiers enable an uninterrupted audio experience during sudden supply voltage drops down to 6 V in hybrid electric vehicles, micro-hybrids, mild hybrids, and other cars using start-stop systems.

Drue Freeman, vice president, Global Automotive Sales and Marketing, NXP Semiconductors, said: By offering both Class-AB and Class-D options integrating a wide range of protections and advanced diagnostics, NXP is providing flexibility in designing reliable audio systems for energy-efficient vehicles. This is a great example of how we are using High Performance Mixed Signal technology to help our customers to drive efficiency in all types of vehicles, by achieving efficiency gains in sub-systems throughout the car.

If you drive any type of hybrid electric vehicle, you deserve a smooth in-car entertainment experience. With its excellent sound performance, automotive robustness and great energy efficiency, the NXP TDF8530 is the ideal choice for the high-performance audio solutions we are designing for the energy-conscious driver, said Yongmin Moon, principal research engineer in Hyundai Mobis Multimedia Core Tech Team.

The TDF8530 is the latest addition to NXPs broad portfolio of highly integrated, high-performance automotive Class-D amplifiers, which bring concert-hall quality sound to in-car entertainment systems. The quad channel Class-D amplifier is ideal for automotive head unit and sound system platforms. High-end home entertainment systems such as iPod docking stations can also benefit from the outstanding audiophile sound performance of the TDF8530. The new Class-D amplifier is also designed to support new application areas such as car ambient sound systems, which can create engine sounds for electric vehicles, for example, or active noise-cancellation systems.

With a maximum supply voltage up to 24 V delivering 72W per channel, the ultra-efficient TDF8530 also offers a full range of diagnostics and protections to ensure full automotive robustness. Controlled via the I 2 C bus, the advanced diagnostics include unique start-up diagnostics, as well as many other functions such as speaker protection, clip detection, and AC load tweeter detection. Furthermore, the TDF8530 offers outstanding EMC performance, and delivers optimal sound under maximum power conditions. The thermal fold-back integrated in hardware protects the device from overheating.

The TDF8546 Class-AB amplifier offers an efficient, cost-effective solution for in-car entertainment systems for hybrid and electric vehicles. Compared to other high-efficiency Class-AB amplifiers, the TDF8546 Best Efficiency quad Class-AB amplifier reduces power dissipation by 17 percent. The TDF8546 also eliminates switch noise in the signal path, and offers a full range of best-in-class diagnostics and protections for automotive robustness. Several car audio system manufacturers have selected the TDF8546, including Visteon.

More information about the TDF8530 at

More information about the TDF8546 at


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