International Rectifier has expanded its PowIRaudio family of devices with the introduction of the single channel IR4321M and dual channel IR4322M integrated power modules. These 60V modules complement the existing product offering and expand the power capability of low load-impedance Class D audio systems in applications including car audio systems, table-top audio systems, active speakers and musical instruments (with integrated amplifiers).
The combination of advanced audio controller IC with MOSFETs that are fully optimised for audio performance results in improved efficiency, THD, and EMI, and allow the IR432xM family to operate without a mechanical heatsink over a wide power supply range on either a single or split power supply. High voltage ratings and noise immunity ensure reliable operation over various environmental conditions.
These new modules further expand IR’s portfolio of integrated power modules to offer higher power capability for 2Ohm loads up to 90W per channel without the need for a heatsink.
Additional features common to the family include over-current protection, thermal shutdown, internal/external shutdown and floating differential input.
Two reference designs, the IRAUDAMP21 and IRAUDAMP22, featuring the IR4321M and IR4322M respectively are also available.