Class-D Audio Amplifier
Power supply
The power supply plays a special role in Class-D amplifiers, as every voltage ripple is superimposed on the output signal. It is therefore important to ensure good power integrity in the design. With high output power, snap-in capacitors in the intermediate circuit support the stability of the supply voltage.
IC peripherals
Radio communication is implemented in the standard firmware of the radio modules, but not the final application. Applications therefore require an IC, for example a microcontroller, which requests sensor data and controls the radio module that transmits it.
Connector
Class-D Audio Inductors
Our flat wire inductors are designed to be used in high quality Class-D audio applications. The parts have been tested and optimized in real applications to reduce total harmonic distortion and noise (THD+N) and idle mode losses significantly.
Class-D Audio Inductors
Our flat wire inductors are designed to be used in high quality Class-D audio applications. The parts have been tested and optimized in real applications to reduce total harmonic distortion and noise (THD+N) and idle mode losses significantly.
Filter Capacitors
As a filter component, capacitors are also crucial for low distortion. Due to their size and high availability, most applications use MLCCs. When dimensioning them, attention must be paid to the DC bias effect. Polymer electrolytic capacitors are also suitable; they offer larger capacitances and lower parasitic properties. Film capacitors with polypropylene films are characterized by a very stable capacitance value, but are significantly larger than other technologies for a given capacitance.
Filter Capacitors
As a filter component, capacitors are also crucial for low distortion. Due to their size and high availability, most applications use MLCCs. When dimensioning them, attention must be paid to the DC bias effect. Polymer electrolytic capacitors are also suitable; they offer larger capacitances and lower parasitic properties. Film capacitors with polypropylene films are characterized by a very stable capacitance value, but are significantly larger than other technologies for a given capacitance.
Short Introduction to Class-D Audio Amplifier
Class-D amplifiers do not amplify the analogue audio signal itself. Instead, a pulse-width modulated sine wave at the audio signal frequency is fed into a switching stage (= digital amplifier) and the high frequency part of the amplified signal is filtered out by a low pass filter.
A Class-D amplifier is therefore nothing more than a combination of a pulse width modulator (PWM) with a digital power stage and a downstream low pass filter. The block diagram shows the elements of a Class-D amplifier in full-bridge topology.
