Cautions for IC Heat Dissipation of Class d Pa Amplifier

Class d Pa amplifier has higher efficiency and better thermal performance than Class AB loudspeakers. Nevertheless, the heat dissipation of class D amplifier still needs careful consideration. The thermal performance of Class d Pa amplifier illustrates the principles that should be followed in good design by several common examples. Continuous sinusoidal wave and music are often used as signal sources when evaluating the performance of Class d Pa amplifier in the laboratory. Although it is convenient to use sinusoidal wave for measurement, such measurement results are the thermal load of the amplifier in the worst case. If the Class d Pa amplifier is driven by a continuous sine wave near the maximum output power, the amplifier will often enter a thermal shutdown state.

Speaker performance - Compared with class G boost power supply commonly used in smart amplifiers, the integrated Class H 11-volt DC-DC boost converter can improve power supply voltage and maintain higher efficiency. By tracking the audio level adaptively, class H boost converter can improve system efficiency, minimize power consumption and prolong battery life.