STMicroelectronics TDA7901 automotive audio amplifier

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STMicroelectronics’ TDA7901 automotive audio amplifier integrates a buck controller for class-G power switching and supports high-definition audio, for a good listening experience and high efficiency.

In class-G operation, the TDA7901 buck controller automatically optimises the voltage supplied to the bridge-tied load (BTL) power stage depending on the audio-signal level. The resulting smooth, analog sound comes with near-class-D efficiency at normal listening levels. Because the power dissipation is lower compared with a conventional class-A/B amplifier, the heatsink requirement is optimised. Integrating the buck controller in the IC contributes to the low system size and weight. It is also designed to cut the bill of materials, simplify circuit design and save developing firmware to control the voltage rail.

The product is suited to use in many in-vehicle information (IVI) systems, such as head units, smart cockpit systems, external amplifiers and more. The amplifier signals full in-play diagnostics including real-time load-current monitoring through I²S or I²C interfaces, enabling ASIL-A certification of safety-related applications like warning-tone generators and acoustic vehicle alerting systems (AVAS). A digital impedance meter is also provided, meaning systems containing the amplifier can meet the demanding requirements of automotive OEMs.

With its I²S digital input and intelligent quad-BTL output, the device delivers 4x 43 W of audio power (at 4Ω load, saturated output at 14.4 V). The amplifier has 80 kHz bandwidth to handle high-definition audio. Its wide supply-voltage range, spanning 4.5–18.5 V, prevents disruption by start-stop engine operation and general automotive electrical transients.

For more information: https://www.st.com/en/automotive-infotainment-and-telematics/tda7901.html.