Description

CLASS-D audio amplifiers provide output power with an efficiency of over 90% as compared to CLASS-AB amplifiers that can provide an output efficiency of <50%. CLASS-D amplifiers are implemented in portable personal audio systems that provide quality sound output enabling longer battery life. A widely used CLASS-D amplifier in automotive systems are for E-call systems that provide critical audio feedback to the driver in case of a driver emergency. In E-call systems discrete current sensing is often implemented for continuous diagnostics to ensure speaker is operational at all times.