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Automotive Class-D Audio Power Amplifiers

These audio amps have already been chosen by several automotive audio makers for both boosters and head units, thanks to:

  • High amplification efficiency ratings
  • Robust automotive design with integrated protection against overstresses, such as short circuits, ESD, load dump, or over-temperature
  • A very advanced diagnostic processor
  • A proprietary feedback loop architecture, addressing the need for lower system cost and electromagnetic emissions
  • Fully digital processing
  • Ability to drive very low impedance speakers (as low as 1 ohm)
  • Compliance with new stop/start engine and hybrid engine standards

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.

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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