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Automotive Class-AB Audio Power Amplifiers

ST offers a complete class-AB product portfolio. As well as standard class-AB power amplifiers, ST proposes audio amplifiers in class SB (Single-ended Bridge) and SB-I (SB improved). As a result of their high efficiency, these classes reduce power dissipation by up to 50% compared to standard class AB, simplifying thermal management in current power sets. Moreover, ST has introduced a digital input to offer a clean sound, immune to external interferences. Amplifiers can now be directly connected to the DSP output without any signal conversion. ST also proposes amplifiers that are compatible with start-stop and hybrid engines.

ST's class-AB automotive audio amps offer:

  • Clean, powerful audio
  • A wide portfolio, single-channel devices to powerful quad-channel single-chip devices
  • Robust designs with integrated protection against short circuits, ESD, load dumping, over-temperature
  • Ability to drive very low impedance speakers (as low as 1 ohm)
  • Products compliant with new stop-start engine and hybrid engine standards
  • Optional I²C interface and diagnostics
  • Optional digital input
  • Optional augmented efficiency
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 makes class AB audio the prime choice with a new digital input power amplifier

TDA7802The TDA7802 is the first automotive-qualified, start-stop compliant, analog power amplifier with digital input. It combines the simplicity and cost effectiveness of class AB amplifiers with the sound quality of a digital stream and an efficiency previously unattainable by analog amplifiers. Compared to standard class AB amplifiers, it reduces power dissipation by up to 50%, meeting the standards of car makers for start-stop systems and hybrid vehicles. The TDA7802 is a 4-channel power amplifier with integrated diagnostic features.

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