What is the primary function of a Class D amplifier?

The primary function of a Class D amplifier is its efficiency in amplifying audio signals while minimizing battery drain. Class D amplifiers utilize a switching mechanism that transitions the output transistors between fully on and fully off positions, which reduces the power wasted as heat when compared to traditional amplifiers like Class A or Class AB. This high efficiency is particularly advantageous in portable devices where power conservation is critical. Its design enables it to achieve efficiencies typically above 90%, making it ideal for battery-powered applications, as it can deliver substantial audio output without rapidly depleting energy resources. This efficiency means that it can run cooler and longer than many other types of amplifiers in a variety of applications, including hearing aids, where conserving battery life is particularly important.