AN-1070 Datasheet, PDF (1/14 Pages) International Rectifier – Application Note

Application Note AN-1070
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
Drain Source Breakdown Voltage BV_DSS....................................…………2
Static Drain-to-Source On Resistance R_DS(on).............................…………4
Gate Charge Q_g..........................................................................…………5
Body Diode Reverse Recovery Charge, Q_rr ...............................…………8
Internal Gate Resistance R_G(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.
www.irf.com
AN-1070
1