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A topological comparison of PWM and hysteresis controls in switching audio amplifiers

The switching audio amplifiers are widely used in various portable and consumer electronics because of their high efficiency, but suffer from low audio performances due to inherent nonlinearity. This problem can be limited with efficient feedback from the output power stage. The research community focuses now to the efficient error correction by feedback control systems. This paper proposes a theoretical and practical comparison between the PWM control and our proposed hysteresis solution. These topologies are widely used in a very wide range of applications. This work shows that the hysteresis solution offers both lower power consumption and higher audio performances for embedded audio application.