International Rectifier IRAUDAMP18 Reference Design Download

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IRAUDAMP18 REV

1.0

IRAUDAMP18

35W/4

Ω

x 2 Channel Class D Audio Power Amplifier

Using the IR4312

Jun Honda, Liwei Zheng

CAUTION:

International Rectifier suggests the following guidelines for safe operation and
handling of IRAUDAMP18 Demo board;



Always wear safety glasses whenever operating Demo Board



Avoid physical contact with exposed metal surfaces when operating Demo
Board



Turn off Demo Board when placing or removing measurement probes

Summary of Contents for IRAUDAMP18

Page 1: ...Liwei Zheng CAUTION International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP18 Demo board Always wear safety glasses whenever operating Demo Board Avoid ph...

Page 2: ...OF CONTENTS PAGE INTRODUCTION 3 SPECIFICATIONS 3 CONNECTION SETUP 4 TEST PROCEDURES 5 PERFORMANCE AND TEST GRAPHS 5 THERMAL INFORMATION 8 SCHEMATIC 9 IRAUDAMP18 BILL OF MATERIALS 10 IRAUDAMP18 PCB SP...

Page 3: ...load Multiple Protection Features Over current protection OCP high side and low side Over voltage protection OVP Under voltage protection UVP high side and low side Over temperature protection OTP PWM...

Page 4: ...CN1 Analog input for CH1 and CH2 POWER P3 Single supply CH1 OUT P1 Output for CH1 CH2 OUT P2 Output for CH2 CN1 P1 P2 P3 CH1 Output CH2 Output Audio Input 18 31 3A DC supply 4 Ohm 4 Ohm Audio Signal G...

Page 5: ...2 8 Quiescent current for the power supply should be 70mA 10mA at 31V Functionality Audio Tests 9 Sweep the audio signal voltage from 15 mVRMS to 1 5 VRMS 10 Monitor the output signals at P1 P2 with a...

Page 6: ...V 1 2 Blue Solid 2 Anlr Level B Left Ch2 4ohm SP 25V 10 4 8 6 4 2 0 2 d B r A 20 200k 50 100 200 500 1k 2k 5k 10k 20k 50k 100k Hz Noise Floor Test Conditions VBus 31V Load Impedance 4 ohms No Input Si...

Page 7: ...ohms Color Sweep Trace Line Style Thick Data Axis Comment 1 1 Red Solid 2 Fft Ch 1 Ampl Left Ch1 4ohm 1 2 Blue Solid 2 Fft Ch 2 Ampl Left Ch2 4ohm 100 0 80 60 40 20 d B V 10 20k 20 50 100 200 500 1k...

Page 8: ...Information 1 8 Po Thermal Test Conditions Tamb 25 C natural convection cooling Both Channel Driven 1 8Po continuous 30mins Temperature measured by infrared camera Fig 7 IRAUDAMP18 Vbus 31V IR4312 s...

Page 9: ...2 P1 D7 C33 0 1uF 63V R46 2 2k R44 10 1W RCH CT_PGND 1 2 P2 C34 0 1uF 63V D9 D8 CT_SGND C12 2 2nF 50V R19 180R R24 180R C7 2 2nF 50V R22 180R VSS R21 180R C13 2 2nF 50V R20 180R R23 180R C8 2 2nF 50V...

Page 10: ...1 ND DS2 LED GREEN CLEAR 0603 SMD 1 Digikey 20 160 1646 1 ND DS3 LED BLUE CLEAR 0603 SMD 1 Digikey 21 IR4312 IC1 2 CH PowIRaudio integrated Class D IC 1 IR 22 Sagami 7G14A 220M R L1 L2 Power Inductors...

Page 11: ...Z4 DIODE ZENER 33V 375MW SOD123F 1 Digikey 49 BZT52C16 FDICT ND Z5 DIODE ZENER 16V 500MW SOD 123 1 Digikey PCB Specifications PCB 1 Two Layers SMT PCB with through holes 2 1 16 thickness 3 2 0 OZ Cu...

Page 12: ...www irf com Page 12 of 13 IRAUDAMP18 REV 1 0 PCB Layout Top side Fig9 Bottom side Fig10 Note Refer to AN1170 for footprint and board mounting details...

Page 13: ...vision changes descriptions Revision Changes description Date Rev 1 0 Released May 11 16 2012 WORLD HEADQUARTERS 101 N Sepulveda Blvd El Segundo California 90245 Tel 310 252 7105 Data and specificatio...

Page 14: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information International Rectifier IRAUDAMP18...