3.4 Class D Audio Amplifier

The Class D amplifier has a significant advantage in many applications due to its lower power dissipation, which produces less heat. The IS2013S and IS2015S SoC have a built-in Class D amplifier that reduces circuit board space and system cost. The efficiency of the amplifier extends the battery life in portable systems.

The Class D amplifier is implemented by using a full-bridge output stage. A full bridge uses two half-bridge stages to drive the load differentially. The Class D amplifier provides a good SNR and enough drive capability for a 4Ω speaker driver.