July 25, 2016
Build a Class D audio amplifier
Compared to analog audio amplifiers like Class-A, -B and -AB, digital Class-D amplifiers have much higher power efficiency allowing them to run cooler and longer from a battery, which is why they have become very popular in portable equipment like phones and MP3 players, but also in many other applications. Even though Class-D amplifiers have their negative points, bad EMI behavior for instance, most of these problems can be fixed more than satisfactory applying good design techinques and practices. Here is a design for a full-bridge Class-D amplifier that, contrary to a half-bridge design, does not produce even harmonics.