El Segundo, Calif.International Rectifier, IR, has introduced the IRAUDAMP7 reference design for Class D audio amplifiers above 25W per channel, including home theater applications, musical instruments and car entertainment.
With a power range from 25W to 500W, the IRAUDAMP7 offers a high degree of scalability on a single layer PCB. The IRAUDAMP7S two-channel, 120W half-bridge design provides 91 percent efficiency at 120W in Class D stage, eight ohms, and a THD+N of 0.005 percent at 1 kHz, 60W, eight ohms, (both typical).
The IRAUDAMP7D features IR's IRS2092 protected digital audio driver IC in a DIP16 package together with through-hole components while the IRAUDAMP7S features the IRS2092S in an SOIC package with surface-mount components.
Both reference designs are paired with the IRFI4019H-117P digital audio dual MOSFET to further enhance scalability, and are wave solder process compatible.
The IRAUDAMP7 incorporates critical protection features including over-current protection, over-voltage protection, under-voltage protection, DC-protection, and over-temperature protection. Housekeeping functions include a ±5V supply for analog signal processing for the preamplifier and a +12V supply (Vcc) referenced to -B for the Class D gate driver stage.
International Rectifier, www.irf.com