App note: RC Snubber for Class-D audio amplifiers

App note from Cirrus about overshoot/ringing suppression in the output stage of Class-D amplifiers using RC Snubber. Link here (PDF) High speed switching of power MOSFETs in the power stage of Class-D amplifiers results in output voltage over/undershoot and high frequency ringing on the output waveform. The over/undershoot places additional stress on the power MOSFETs, […]

App note: Current sense amplifiers in class-D audio subsystems

App note from Texas Instruments about output current sensing in class-D amplfiers. Link here (PDF) Current sensing in audio subsystems are widely used in conjunction with CLASS-D amplifiers for diagnostics or to provide speaker current feedback to the DSP for speaker enhancement to emulate smartamp. The most expensive component in the audio subsystem is the […]

App note: Fundamentals of operation and recent developments of class D amplifiers

Good read about class D amplfiers from MAXIM Integrated. Link here (PDF) A Class D amplifier’s high efficiency makes it ideal for portable and compact high-power applications. Traditional Class D amplifiers require an external lowpass filter to extract the audio signal from the pulse-width-modulated (PWM) output waveform. Many modern Class D amplifiers, however, utilize advanced […]

App note: Class D audio amplifier performance relationship to MOSFET parameters

Application note from International Rectifier on MOSFET paremeters to consider when designing a Class D audio amplifier. Link here (PDF) Class D audio amplifier is a switching amplifier that consists in a pulse width modulator (with switching frequency in order of several hundred kHz), a power bridge circuit and a low pass filter. This type […]

App note: Class D Audio Amplifier Basics

A good read about class D Audio Amplifier, an app note from International Rectifier A Class D audio amplifier is basically a switching amplifier or PWM amplifier. There are a number of different classes of amplifiers. This application note takes a look at the definitions for the main classifications.

Class D amplifier assembled

NBitWonder built a class-D amplifier Class-D amplifier is a highly efficient amplifier that operates its output devices as switches instead of as variable resistors.  We posted a highly experimental version of this project last November, and it met with a surprising amount of positive feedback from the DIY community.  Therefore, we developed it as a […]