The IRAUDAMP4 Class D audio power amplifier reference design is presented as reducing PCB space by 50% over typical circuit designs for Class D audio amplifiers over the entire midvoltage range of mid- and high-power amplifiers for home theater applications, professional amplifiers, musical instruments, and car entertainment. Featuring the IRS20955 200-V digital audio driver IC and the IRF6645 DirectFET digital audio MOSFETs, the IRAUDAMP4 is a two-channel 120-W half-bridge design offering 96% efficiency.

The reference design also offers a THD+N of 0.004% at 60 W into 4 Ω. The design incorporates critical features such as protection from overcurrent, overvoltage, undervoltage, dc, and overtemperature, in addition to housekeeping functions such as a ¡À5-V supply for analog signal processing for the preamplifier and a 12-V supply for the Class D gate driver stage.

The two-channel design is scalable for power and a number of channels, and requires no heat sink under normal operating conditions. ($550available now.)