SNAS491B February 2010 – February 2018 LM48580
PRODUCTION DATA.
Class H is a modification of another amplifier class (typically Class B or Class AB) to increase efficiency and reduce power dissipation. To decrease power dissipation, Class H uses a tracking power supply that monitors the output signal and adjusts the supply accordingly. When the amplifier output is below 3 VP-P, the nominal boost voltage is 6 V. As the amplifier output increases above 3 VP-P, the boost voltage tracks the amplifier output as shown in Figure 14. When the amplifier output falls below 3 VP-P, the boost converter returns to its nominal output voltage. Power dissipation is greatly reduced compared to conventional Class AB drivers.