Class D Amplifier Peformance Relationship to MOSFET Parameters - International Rectifier - #1

APPLICATION NOTE

By Jorge Cerezo, International Rectifier Table of Contents

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Abstract............................................................................................................2

Introduction......................................................................................................2

Key MOSFET Electrical Parameters in Class D Audio Amplifiers....................2

Drain Source Breakdown Voltage BV_DSS................................................2

Static Drain-to-Source On Resistance RDS(on).........................................4

Gate Charge Q_g......................................................................................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.

AN-1070

www.irf.com

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