Designing Practical High Performance Class D Audio Amplifier

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VDS Switching Waveforms • DirectFET ® package shows cleanest and fastest (approx. three times faster) switching waveforms than amplifier with TO-220 package. • Same IRF6665 MOSFET die is tested in both packages DirectFET ® Package Blue : V GS Pink : V DS TO-220 package www.irf.com
EMI Data @ 1/8 Pout Condition (12.5W) • DirectFET ® and TO-220 with the same IRF6665 silicon die • MosFET devices with no heatsink • No shielded room • Over 2MHz, DirectFET ® amplifier shows approximately 9dB lower noise than TO-220 amplifier • Under 2MHz, background noise is dominant Frequency (MHz) DirectFET ® Frequency (MHz) TO-220 CISPR13 Quasi-Peak Limits Average Limits CISPR13 Quasi-Peak Limits Average Limits www.irf.com
Page 1 and 2: Designing Practical High Performanc
Page 3 and 4: Chapter 1 Class D Audio Overview ww
Page 5 and 6: Class D Amplifier Feed back Triangl
Page 7 and 8: Major Causes of Imperfection Pulse
Page 9 and 10: Chapter 2 DIGITAL AUDIO MOSFET The
Page 11 and 12: IRF6665 DirectFET ® The best MOSFE
Page 13 and 14: DirectFET ® device technology SO-8
Page 15 and 16: Advantages of DirectFET ® : Reduce
Page 17 and 18: IRF6665 DirectFET ® Evaluation Boa
Page 19: THD+N Data Test Conditions: Half-Br
Page 23 and 24: Assembling IRF6665 in audio Class-D
Page 25 and 26: Temperature difference (°C) 100 90
Page 27 and 28: Half-Bridge Full-Pak ⇒ S2 G2 D2/S
Page 29 and 30: Disturbance Power Half-Bridge Full-
Page 31 and 32: Conclusion 1 • With IR’s Direct
Page 33 and 34: Protected DIGITAL AUDIO Gate Driver
Page 35 and 36: The discrete dead-time method sets
Page 37 and 38: Overload Protection in Class AB B+
Page 39 and 40: Why Bi-Directional CS? Load Load Lo
Page 41 and 42: What happens in the Short Circuit E
Page 43 and 44: In Negative Half Cycle IRS20124 OC
Page 45 and 46: Tj Estimation in Short Circuit Even
Page 47 and 48: Chapter 4 Design Example www.irf.co
Page 49 and 50: Design: 100W+100W Module • IR’s
Page 51: Conclusion 2 By using IR’s Digita

Designing Practical High Performance Class D Audio Amplifier

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