IRAUDAMP17 100W/4Ω x 2 Channel Class D Audio Power Amplifier Using the IR4302 By Jun Honda, Liwei Zheng CAUTION: International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP17 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 www.irf.com IRAUDAMP17 REV 1.1 Page 1 of 13 TABLE OF CONTENTS ........................... PAGE INTRODUCTION..............................................................................3 SPECIFICATIONS ...........................................................................3 CONNECTION SETUP ....................................................................4 TEST PROCEDURES......................................................................5 PERFORMANCE AND TEST GRAPHS ..........................................5 THERMAL INFORMATION..............................................................8 BILL OF MATERIALS ....................................................................10 PCB SPECIFICATIONS.................................................................11 REVISION CHANGES DESCRIPTIONS .......................................13 www.irf.com IRAUDAMP17 REV 1.1 Page 2 of 13 Introduction The IRAUDAMP17 reference design is a two-channel, 100W/ch (4 Ω/52V Bus voltage) half-bridge Class D audio power amplifier with single power supply. This reference design demonstrates how to use the IR4302 IC with single power supply, implement protection circuits, and design an optimum PCB layout using PowIRaudio integrated Class D IC. This reference design does not require additional heatsink or fan cooling for normal operation (one-eighth of continuous rated power).The reference design provides all the required housekeeping power supplies for ease of use. The twochannel design is scalable for power and the number of channels. Applications AV receivers Home theater systems Mini component stereos Powered speakers Sub-woofers Musical Instrument amplifiers Car audio amplifiers Features Output Power: Multiple Protection Features: PWM Modulator: 100W x 2 channels (10%THD+N 4Ω load; with heatsink), 60W x 2 channels (10%THD+N 4Ω load; no heatsink), 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) Self-oscillating half-bridge topology Specifications General Test Conditions (unless otherwise noted) 40V~52V Supply Voltages 30V~42V Load Impedance 2-4Ω Self-Oscillating Frequency 400kHz Gain Setting 24.8dB Notes / Conditions With heatsink *Without heatsink Resistive load No input signal, Adjustable 1Vrms input yields rated power Electrical Data IR Devices Used Modulator Typical Notes / Conditions IR4302 PowIRaudio integrated Class D IC Self-oscillating, second order sigma-delta modulation, analog input Single power supply; 40V~52V Power Supply Range 30V~42V *Without heatsink 75W 1kHz, 4Ω load, with heatsink Output Power CH1-2: (1% THD+N) 50W 1kHz, 4Ω load, without heatsink 100W 1kHz, 4Ω load, with heatsink Output Power CH1-2: (10% THD+N) 60W 1kHz, 4Ω load, without heatsink Rated Load Impedance 2-4Ω Resistive load Idling Supply Current 65mA No input signal Total Idle Power Consumption 3.4W No input signal Distortion 0.008% THD+N @ 30W, 4Ω www.irf.com IRAUDAMP17 REV 1.1 Page 3 of 13 Residual Noise Channel Efficiency IHF-A weighted, AES-17 filter 220V 96% Single-channel driven,100W Class D stage *Need to change components as below to achieve 30V~42V power supply voltage range without heatsink With Heatsink Without Heatsink Power Supply Voltage Range 40~52V 30~42V R7~R10 390Ω 240Ω Z5 36V 27V Connection Setup * Without heatsink Power supply voltage range is 30~42V 40-52V*, 3A DC supply 250W, Non-inductive Resistors 4 Ohm 4 Ohm P1 P2 P3 CH1 Output CH2 Output Power Indicator CLIP Indicator IR4302 Audio CN1 Input FAULT Indicator SW1 SW1:PWM Shutdown/MUTE Audio Signal Generator Fig 1 Typical Test Setup Connector Description Audio IN POWER CH1 OUT CH2 OUT www.irf.com CN1 P3 P1 P2 Analog input for CH1 and CH2 Single supply Output for CH1 Output for CH2 IRAUDAMP17 REV 1.1 Page 4 of 13 Test Procedures Test Setup: 1. 2. 3. 4. 5. 6. 7. 8. Connect 4, 250W load to both output connectors, P1 and P2 and audio analyzer (Ap). Connect Audio Signal Generator to CN1 for CH1 and CH2 respectively (Ap). Connect a single power supply to P3 pre-adjusted to 40-52V as shown on Figure above Turn on the power supply. Turn on SW1 (right side). Blue LED (Normal) stays turning on after RED LED extinguished. With an Oscilloscope, monitor switching waveform at VS of CH1 and CH2. Quiescent current for the power supply should be 70mA 10mA at 52V. 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 an oscilloscope. The waveform must be a non distorted sinusoidal signal with input sinusoidal signal below 1Vrms. Performance and Test Graphs Power vs THD+N Test Conditions: VBus = 52V(with heatsink) Input Signal=1 kHz Load Impedance = 4 ohms 10 5 2 1 0.5 0.2 % 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20m 50m 100m 200m 500m 1 2 5 10 20 50 100 200 W Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 3 Blue Magenta Solid Solid 2 2 Anlr.THD+N Ratio Anlr.THD+N Ratio Left Left CH1 4ohms 52V CH2 4ohms 52V Fig 2 www.irf.com IRAUDAMP17 REV 1.1 Page 5 of 13 Test Conditions: VBus = 42V(without heatsink) Input Signal=1 kHz Load Impedance = 4 ohms THD+N vs Power 10 5 2 1 0.5 % 0.2 0.1 0.05 0.02 0.006 20m 50m 100m 200m 500m 1 2 5 10 20 50 100 W Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 3 Blue Magenta Solid Solid 2 2 Anlr.THD+N Ratio Anlr.THD+N Ratio Left Left Ch1 42V 4ohms Ch2 42V 4ohms Fig 3 Frequency Response Test Conditions: VBus = 52V Set Output = 1V Load Impedance = 4 ohms +4 +2 +0 d B r -2 -4 A -6 -8 -10 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k 200k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 2 Blue Magenta Solid Solid 2 2 Anlr.Level A Anlr.Level B Left Left Ch1 52V 4ohms Ch2 52V 4ohms Fig 4 www.irf.com IRAUDAMP17 REV 1.1 Page 6 of 13 Noise Floor Test Conditions: VBus = 52V Load Impedance = 4 ohms No Input Signal +20 +0 -20 -40 d B V -60 -80 -100 -120 -140 10 20 50 100 200 500 1k 2k 5k 10k 20k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 2 Blue Magenta Solid Solid 2 2 Fft.Ch.1 Ampl Fft.Ch.2 Ampl Left Left Ch1 Ch2 Fig5 Noise Floor with 1Vrms Output Test Conditions: VBus = 52V Set Output= 1Vrms @ 1 KHz Load Impedance = 4 ohms +0 -20 -40 d B V -60 -80 -100 10 20 50 100 200 500 1k 2k 5k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 2 Blue Magenta Solid Solid 2 2 Fft.Ch.1 Ampl Fft.Ch.2 Ampl Left Left Ch1 Ch2 Fig 6 www.irf.com IRAUDAMP17 REV 1.1 Page 7 of 13 Efficiency 100.0% Efficiency 80.0% 60.0% 40.0% 20.0% *Tested with heatsink 0.0% 0 20 40 60 80 100 120 Power (W) Thermal Information: Fig 7 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 8 IRAUDAMP17 with heatsink (Vbus=52V) IR4302’s temperature saturated around 85°C within 30minutes Fig 9 IRAUDAMP17 without heatsink (Vbus=42V) IR4302’s temperature saturated around 82°C within 30minutes www.irf.com IRAUDAMP17 REV 1.1 Page 8 of 13 CN1 1 3 5 4 2 2.2uF CP2 2.2uF CP1 2.2uF CP4 2.2uF CP3 INPUT GND 100k R1 100k R2 GND VSS * C7 C8 180R R24 36V 390ohm R7,R8,R9,R10 With Heatsink VSS D1 D10 27V 240 Ohm 30-42V Without Heatsink R18 68k 1% C16 C17 1nF C15 1nF 22uF, 16V 180R 2.2nF,50V R17 68k 1% R21 C14 180R R23 R20 180R 2.2nF,50V 2.2nF,50V C9 40-52V Z5 2.2nF,50V C12 2.2nF,50V C13 Power Supply Voltage Range CT_SGND 330 *3.01k 1% C4 1nF *3.01k 1% C3 1nF R14 330 CT_SGND R6 R13 R5 +B R7 *390R 1W R10 *390R 1W VAA C11 2.2nF,50V 2.2nF,50V C6 R22 180R R16 68k 1% R15 68k 1% R19 180R 2.2nF,50V Z1 C5 10uF,10V 5.1V Z2 C10 5.1V 10uF,10V R9 *390R 1W CT_SGND R8 *390R 1W CT_SGND 330 *3.01k 1% C2 1nF 330 CT_SGND R4 R11 *3.01k 1% C1 1nF R12 R3 SD FAULT CSD COMP1 IN-1 IN+1 VAA VSS GND IN+2 IN-2 COMP2 CLIP DS2 DS1 R27 10K VAA R25 47K 12 11 10 9 8 7 6 5 4 3 2 1 R26 10K VAA 29 NC 30 NC 10uF,16V C18 NC 13 GND -B GND VCC 14 27 GND 31 CSH2 28 COM COM 15 CSH1 DS3 16 4.7R R28 25 1N4148 D2 VS2 10K R29 1N4148 D3 1N4148 D5 1N4148 D4 24 VP2 O O VP1 VS2 23 4.7R R31 VS1 VN1 VN2 3 22uF CP5 20 21 22 GND Q1 1k 1W 2 R35 11V Z3 R34 9.1k MJD44H11T4G 33K C20 0.1uF,50V R33 VCC 0.1uF,50V 4.7R +B C28 0.1uF,100V 0.1uF,100V C27 R40 9.1k C26 0.1uF 1R R42 1R R41 0.1uF 33K C19 IC1 IR4302 C25 R32 R30 C32 0.47uF, 400V L2 22uH C31 0.47uF, 400V L1 22uH 0.1uF, 63V C34 R44 D9 10, 1W D8 0.1uF, 63V C33 D7 R43 10, 1W D6 GND 1 2 P1 +B R53 10k +B C38 2200uF, 63V Z4 56V R52 10k +B GND 10 Ohm R50 Single Supply 10R0 Not mounted 10 Ohm Dual Supply CT_PGND GND GND R50 INPUT GND NM R47 CT_SGND CT_PGND R55 47k +B +B C39 GND C37 2200uF, 63V 0.1uF,100V 0.1uF,100V C36 Not mounted - + C35 0.1uF R51 47k R47 CT_PGND RCH 1 2 P2 4 3 OVP 2 6 SW SPDT GND ON 5 CT_PGND LCH +B SD CT_PGND OFF S1 1 Q2 MMBT5551 SCH_DB_4302 Rev1.2 1 R45 2.2k R46 2.2k 26 VB2 VB1 17 VS1 18 IRAUDAMP17 REV 1.1 19 R48 10k, 1/2W 10k, 1/2W R49 Q3 MMBT5551 www.irf.com 1 2 P3 Z5 *36V R57 47k R56 10k +B UVP Class D, AMP17 Schematic Schematic Fig 10 Page 9 of 13 Bill of Materials No Digikey P/N Designator Description Quantity Vender 1 2 399-1082-1-ND C1, C2, C3, C4, C15, C17 CAP CER 1000PF 50V 10% X7R 0603 6 Digikey 587-2668-1-ND CAP CER 10UF 10V 10% X7R 0805 2 Digikey 3 4 5 6 7 8 9 10 11 12 490-1500-1-ND C5, C10 C6, C7, C8, C9, C11, C12, C13, C14 CAP CER 2200PF 50V 10% X7R 0603 8 Digikey 587-1433-1-ND C16 CAP CER 22UF 16V 20% X5R 1206 1 Digikey 490-5519-1-ND C18 CAP CER 10UF 16V 10% X6S 0805 1 Digikey 311-1140-1-ND C19, C20 CAP CER 0.1UF 50V 10% X7R 0805 2 Digikey 445-1418-1-ND C25, C26 CAP CER 0.1UF 100V 10% X7R 0805 2 Digikey 445-1377-1-ND C27, C28, C36, C37 CAP CER 0.1UF 100V 10% X7R 1206 4 Digikey 495-1315-ND C31, C32 CAP FILM 0.47UF 400VDC RADIAL 2 Digikey BC2054-ND C33, C34 CAP FILM 0.1UF 63VDC RADIAL 2 Digikey 445-1418-1-ND C35 CAP CER 0.1UF 100V 10% X7R 0805 1 Digikey 565-1137-ND C38, C39 2 Digikey 13 14 15 CP1-3545N-ND CN1 CAP ALUM 2200UF 63V 20% RADIAL CONN JACK STEREO R/A 5PIN 3.5MM 1 Digikey 565-1103-ND CP1, CP2, CP3, CP4 CAP ALUM 2.2UF 50V 20% RADIAL 4 Digikey 565-1056-ND CP5 1 Digikey 16 17 18 19 20 21 1N4148W-FDICT-ND D1, D2, D3, D4, D5, D10 CAP ALUM 22UF 25V 20% RADIAL DIODE SWITCH 100V 400MW SOD123 6 Digikey DFLU1200-7DICT-ND D6, D7, D8, D9 DIODE ULTRA FAST POWERDI 123 4 Digikey 160-1181-1-ND DS1 LED RED CLEAR 0603 SMD 1 Digikey 160-1183-1-ND DS2 LED GREEN CLEAR 0603 SMD 1 Digikey 160-1646-1-ND DS3 LED BLUE CLEAR 0603 SMD 1 Digikey IR4302 IC1 2 CH PowIRaudio integrated Class D IC 1 22 Sagami 7G17A-220M-R L1, L2 2 23 24 25 26 27 28 29 30 281-1414-ND P1, P2, P3 Power Inductors Class D Inductor 22uH CONN TERM BLOCK PCB 5.0MM 2POS IR Inductors, Inc 3 Digikey MJD44H11T4GOSCT-ND Q1 TRANS PWR NPN 8A 80V DPAK 1 Digikey MMBT5551FSCT-ND Q2, Q3 TRANSISTOR NPN 160V SOT-23 2 Digikey 31 32 33 34 35 36 37 38 39 40 41 42 43 RMCF0603JT100KCT-ND R1, R2 RES 100K OHM 1/10W 5% 0603 SMD 2 Digikey RMCF0603JT330RCT-ND R3, R4, R5, R6 RES 330 OHM 1/10W 5% 0603 SMD 4 Digikey RMCF2512JT390RCT-ND R7, R8, R9, R10 RES 390 OHM 1W 5% 2512 SMD 4 Digikey RHM3.01KCRCT-ND R11, R12, R13, R14 RES 3.01K OHM 1/8W 1% 0805 SMD 4 Digikey 311-68.0KCRCT-ND RES 68.0K OHM 1/8W 1% 0805 SMD 4 Digikey RHM180GCT-ND R15, R16, R17, R18 R19, R20, R21, R22, R23, R24 RES 180 OHM 1/10W 5% 0603 SMD 6 Digikey RHM47KGCT-ND R25 RES 47K OHM 1/10W 5% 0603 SMD 1 Digikey RHM10KGCT-ND R26, R27, R29 RES 10K OHM 1/10W 5% 0603 SMD 3 Digikey RMCF0603JT4R70CT-ND R28, R30, R31 RES TF 1/10W 4.7 OHM 5% 0603 3 Digikey RHM33KGCT-ND R32, R33 RES 33K OHM 1/10W 5% 0603 SMD 2 Digikey RHM9.1KARCT-ND R34, R40 RES 9.1K OHM 1/8W 5% 0805 SMD 2 Digikey PT1.0KXCT-ND R35 RES 1.0K OHM 1W 5% 2512 SMD 1 Digikey P1.0ACT-ND R41, R42 RESISTOR 1.0 OHM 1/8W 5% 0805 2 Digikey 541-10.0AFCT-ND R43, R44 RES 10.0 OHM 1W 1% 2512 SMD 2 Digikey RMCF0805JT2K20CT-ND R45, R46 RES 2.2K OHM 1/8W 5% 0805 SMD 2 Digikey 541-10KVCT-ND R48, R49 RES 10K OHM 1/2W 5% 1210 SMD 2 Digikey 311-10ARCT-ND R50 RES 10 OHM 1/8W 5% 0805 SMD 1 Digikey RHM47KARCT-ND R51, R55, R57 RES 47K OHM 1/8W 5% 0805 SMD 3 Digikey www.irf.com IRAUDAMP17 REV 1.1 Page 10 of 13 44 RHM10KARCT-ND R52, R53, R56 45 46 47 360-1758-ND DDZ5V1BDICT-ND BZT52C11-FDICT-ND MMSZ5263BT1GOSCTND 48 49 50 51 52 53 3 Digikey S1 RES 10K OHM 1/8W 5% 0805 SMD SWITCH TOGGLE SPDT .4VA SEAL PCB 1 Digikey Z1, Z2 DIODE ZENER 5.1V 500MW SOD-123 2 Digikey Z3 DIODE ZENER 11V 500MW SOD123 1 Digikey Z4 DIODE ZENER 56V 500MW SOD-123 1 Digikey BZT52C36-FDICT-ND Z5 DIODE ZENER 36V 500MW SOD-123 1 Digikey 8401K-ND 1/2" Standoffs 4-40 STDOFF HEX M/F 4-40 .500"L ALUM 4 Digikey H724-ND 4-40 Nut NUT HEX 4-40 STAINLESS STEEL 4 Digikey H729-ND No. 4 Lock Washer WASHER LOCK INTERNAL #4 SS 4 Digikey BER161-ND Thermal Pad THERMAL PAD .020" 4X4" GAPPAD 1/6 Digikey IRAUDAMP17 Heatsink Fig11 PCB Specifications PCB: 1. 2. 3. 4. 5. 6. Two Layers SMT PCB with through holes 1/16 thickness 2/0 OZ Cu FR4 material 10 mil lines and spaces Solder Mask to be Green enamel EMP110 DBG (CARAPACE) or Enthone Endplate DSR-3241or equivalent. 7. Silk Screen to be white epoxy non conductive per IPC–RB 276 Standard. 8. All exposed copper must finished with TIN-LEAD Sn 60 or 63 for 100u inches thick. 9. Tolerance of PCB size shall be 0.010 –0.000 inches 10. Tolerance of all Holes is -.000 + 0.003” 11. PCB acceptance criteria as defined for class II PCB’S standards. www.irf.com IRAUDAMP17 REV 1.1 Page 11 of 13 PCB Layout Top side: Fig 12 Bottom side: Fig 13 Note: Refer to AN1170 for footprint and board mounting details. www.irf.com IRAUDAMP17 REV 1.1 Page 12 of 13 Revision changes descriptions Revision Rev 1.0 Rev 1.1 Changes description Released BOM R50=10ohm Date May, 16 2012 May, 24 2012 WORLD HEADQUARTERS: 101 N. Sepulveda Blvd., El Segundo, California 90245 Tel: (310) 252-7105 Data and specifications subject to change without notice. 05/16/2012 www.irf.com IRAUDAMP17 REV 1.1 Page 13 of 13