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車載用AB級オーディオ・パワーアンプ

Class AB automotive audio amplifiers

TDA7576B drives high-quality audio for trucks and heavy vehicles

ST's TDA7576B audio power amplifier has been designed specifically for commercial vehicles such as trucks, buses and agricultural vehicles, whose electrical systems run at 24 V rather than the 12 V used in cars. It is the world’s first audio amplifier that can drive the cabin loudspeakers directly, without any external components, in 24 V vehicles.
Audio amplifiers used in automotive systems must be designed to withstand the demanding automotive environment, including a high level of electrical noise and the need to provide comprehensive protection against potential hazards such as short circuits, load dumps, and excessive chip temperature. Audio amplifiers for use in 12 V automotive systems have reached a very high level of sophistication,  but up till now audio equipment manufacturers have been unable to replicate this performance in 24 V systems without using external components that not only drive up the Bill of Materials cost, but can even compromise safety under certain conditions.

ST’s TDA7576B 24V audio amplifier uniquely solves this problem. It is built in a proven high-volume semiconductor manufacturing technology called BCD5 that allows a single chip to include both the power blocks and the signal management blocks – so there is no need to use a more expensive multi-chip approach - and it can sustain a peak supply voltage of 60 V without any damage. The most powerful audio power amplifier for 24 V systems available on the market, the TDA7576B has been designed with the same guidelines and care that ST uses for car radio audio power amplifiers, so the final user can enjoy the same high-quality audio as car drivers.

STは新しいデジタル入力パワー・アンプにより、AB級オーディオアンプにおいて新たな選択肢を提案します。

TDA7802TDA7802は初めて車載用認定を受けたデジタル入力が可能なアイドリング/ストップ車対応アナログ・パワー・アンプです。通常のAB級アンプを用いた設計上の共通性と、周辺部品のコスト削減をデジタル・ストリームの音質とこれまでのアナログ・アンプでは達成でき得なかった高効率を両立しました。標準的なAB級アンプより電力損失を最大50 %低減し、アイドリング・ストップ・システムの車とハイブリッド車に対する自動車メーカーの消費電力低減要求を満足させます。TDA7802は、診断機能を内蔵した4チャネル・パワー・アンプです。

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