| Class D Audio Amplifier Performance Relationship to MOSFET Parameters By Jorge Cerezo, International Rectifier Table of Contents Page Abstract............................................................................................................2 Introduction......................................................................................................2 Key MOSFET Electrical Parameters in Class D Audio Amplifiers....................2 Industrial drain Source Breakdown Voltage BVDSS................................................2 Static Drain-to-Source On Resistance RDS(on).........................................4 Gate Charge Qg......................................................................................5 Body Diode Reverse Recovery Charge, Qrr...........................................8 Internal Gate Resistance RG(int)........................................................11 MOSFET Package..................................................................................11 Maximum Junction Temperature.............................................................12 International Rectifier Digital Audio MOSFET...................................................13 Conclusions.........................................................................................14 References........................................................................................................14 This application note discusses key parameters to be considered in the selection of MOSFETs for class D amplifier and their relationship with amplifier performance such as efficiency, EMI, and THD. In addition, benefits and advantages of IR Digital Audio MOSFETs in class D audio amplifier are presented. |