Designing Practical High Performance Class D Audio Amplifier

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IRS20124 THD+N Performance V CC : ±35.0V Gate Driver: IRS20124 MOSFET: IRFB4212 f PWM = 400kHz Note that low THD+N characteristic shows quiet noise floor due to clean and stable switching timings. Dead-time Settings: DT1 = 15ns DT2 = 25ns DT3 = 35ns DT4 = 45ns www.irf.com
Overload Protection in Class AB B+ Ov erload X1 Equivalent circuit TIP3055 Q1 220m R1 2.2k R3 Q2N3904 Q3 220m R6 Overload 2.2k R7 220m R2 10k R4 R LOAD 1K R5 Q2N3904 Q4 D2 D1N4148 TIP2955 Q2 D1 D1N4148 R LOAD 8 R8 10k R9 B- When a Class AB amplifier has a shorted load, the load current can ramp up rapidly. The voltage across the device is fixed to the bus voltage. The loss in the device is enormous amount The power devices can not be protected with over current detection method Therefore an impedance bridge has been commonly used, which has following drawback; • Reactive components in the load impedance, which is common in realistic loudspeakers, causes false protection 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 and 20: THD+N Data Test Conditions: Half-Br
Page 21 and 22: EMI Data @ 1/8 Pout Condition (12.5
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: The discrete dead-time method sets
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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