STの車載用D級オーディオ・パワーアンプは、すでにいくつかのカー・オーディオ・メーカーによってブースタアンプとヘッド・ユニットに採用されました。その理由は以下のとおりです。

  • 高い増幅効率
  • 各種短絡、ESD、ロード・ダンプ、過熱など、過度のストレスからの保護機能を統合した堅牢な車載用デザイン
  • 極めて先進的な自己診断回路
  • システム・コスト削減と電磁放射低減のニーズに対処する、独自のフィードバック・ループ・アーキテクチャ
  • フル・デジタル処理
  • 超低インピーダンス(最小1Ω)のスピーカを駆動する能力
  • 新しいアイドリングストップ・エンジンとハイブリッド・エンジンの規格に適合

FDA4100LV, FDA450LV and FDA2100LV class D automotive audio amplifiers

Class D amplifiers achieve about 80% higher energy efficiency than analog class AB amplifiers. This greater efficiency helps reduce the electrical load on the alternator and can allow extra functions or speaker channels within standardized enclosure dimensions. Historically, cost, pc-board size and EMI issues have confined automotive class D applications to high-power booster amplifiers. Overcoming these barriers, ST’s full-digital amplifier ICs now allow popular in-car equipment to deliver powerful high-quality audio experiences.

ST’s new audio amplifiers also enhances the audio performance of high-power boosters and integrates circuitry to allow continuous, undistorted playback in vehicles using stop-start engine technology, or in hybrid vehicles as the electrical traction drives and combustion engine switch between various operating modes.

As the first devices of their kind to feature an integrated digital input, the 4 x 135 W FDA4100LV, the 4 x 50 W FDA450LV and the 2 x 180 W FDA2100LV require no signal conversion or filtering circuitry, saving pc-board space and component count. In addition, engineering challenges such as EMI reduction are addressed inside the chips.
ST’s patented feedback loop saves the need for a large output filter, and also allows use in diverse OEM and aftermarket products by reducing dependence on speaker type. Patented features reduce electro-magnetic interference with the tuner and also simplify end-product certification to automotive electromagnetic compatibility (EMC) standards CEI EN 55025 and ISO 11452-2 (2004).

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