ST released a highly integrated car gauge audio amplifier with both high-definition sound quality and class G energy efficiency

     Stmicro's TDA7901 vehicle power amplifier monolithic integrated Class G power amplifier switch step-down controller and HD audio support, this unique combination of features brings excellent auditory experience and high energy efficiency.

     In Class G amplification, the TDA7901 step-down controller automatically optimizes the supply voltage of the bridging load (BTL) power level according to the audio signal level, resulting in smooth analog audio with energy efficiency close to that of class D power amplifier at normal volume. Because the dissipated power is much lower than that of traditional class A/B amplifiers, the radiator requirements are reduced. Monolithic step-down controllers help reduce system weight, reduce bill of material costs, simplify circuit design, and eliminate the need to develop voltage rail control firmware.

     The TDA7901 is suitable for many on-board information (IVI) systems, such as mainframe, intelligent cockpit systems, external power amplifiers, etc. The amplifier emits complete real-time diagnostic signals, including real-time load current monitoring via I2S or I2C interfaces, enabling ASIL-A certification for safety-related applications such as beep generators and low-speed beep systems (AVAS) for electric vehicles. The amplifier chip also provides a digital impedance meter, ensuring that the TDA7901 audio system can meet the most demanding requirements of automotive Oems.

     Equipped with I2S digital input and intelligent four-bridge BTL output, the TDA7901 provides 4x 43W audio power output (14.4V saturation output when driving a 4Ω load). The amplifier uses 80kHz bandwidth to process high definition audio. The wide supply voltage of 4.5V to 18.5V prevents the audio from being interrupted during engine starts and stops and other common voltage transients.