IRAUDAMP19 100W/4Ω x 2 Channel Class D Audio Power Amplifier Using the IR4301 By Jun Honda, Liwei Zheng CAUTION: International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP19 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 IRAUDAMP19 REV 3.0 Page 1 of 14 TABLE OF CONTENTS ........................... PAGE INTRODUCTION ..............................................................................3 SPECIFICATIONS ...........................................................................3 CONNECTION SETUP ....................................................................4 TEST PROCEDURES ......................................................................5 PERFORMANCE AND TEST GRAPHS ..........................................5 THERMAL INFORMATION ..............................................................8 SCHEMATIC ....................................................................................9 BILL OF MATERIALS ....................................................................10 PCB SPECIFICATIONS .................................................................12 REVISION CHANGES DESCRIPTIONS .......................................14 www.irf.com IRAUDAMP19 REV 3.0 Page 2 of 14 Introduction The IRAUDAMP19 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 IR4301 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; 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) Supply Voltages 41V~52V Load Impedance 2-4Ω Self-Oscillating Frequency 400kHz Gain Setting 24.8dB Notes / Conditions Without heatsink Resistive load No input signal, Adjustable 1Vrms input yields rated power Electrical Data Typical Notes / Conditions IR Devices Used IR4301 PowIRaudio integrated Class D IC Modulator Self-oscillating, second order sigma-delta modulation, analog input Single power supply; Power Supply Range 41V~52V* Output Power CH1-2: (1% THD+N) 82.5W 1kHz Output Power CH1-2: (10% THD+N) 100W 1kHz Rated Load Impedance 2-4Ω Resistive load Idling Supply Current 67mA No input signal Total Idle Power Consumption 3.5W No input signal Distortion 0.02% THD+N @ 10W, 4Ω Residual Noise IHF-A weighted, AES-17 filter 250V Single-channel driven, 100W, Class D Efficiency 90% stage *Can be powered by 30V-41V supply with modifications of power resistors and UVP zener.(Please refer Page4) www.irf.com IRAUDAMP19 REV 3.0 Page 3 of 14 Connection Setup 41-52V*, 3A DC supply 250W, Non-inductive Resistors 4 Ohm 4 Ohm P1 P3 P2 CH1 Output CH2 Output IR4301 FAULT Indicator SW1:PWM Shutdown/MUTE Power Indicator IR4301 FAULT Indicator SW1 CN1 Audio Input Audio Signal Generator Fig 1 Typical Test Setup Connector Description Audio IN POWER CH1 OUT CH2 OUT CN1 P2 P1 P3 Analog input for CH1 and CH2 Single supply Output for CH1 Output for CH2 *IRAUDAMP19 can be powered by 30V-41V supply with modifications of power resistors and UVP zener as below. Power supply voltage 41-52V 30-41V R25~R28,R56,R57,R 64,R65 560 ohm 390 ohm Z5 36V 27V www.irf.com IRAUDAMP19 REV 3.0 Page 4 of 14 Test Procedures Test Setup: 1. 2. 3. 4. 5. 6. 7. 8. Connect 4, 250W load to both output connectors, P1 and P3 and audio analyzer (Ap). Connect Audio Signal Generator to CN1 for CH1 and CH2 respectively (Ap). Connect a single power supply to P2 pre-adjusted to 30-52V 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 55mA 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/P3 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 (without heatsink) Test Conditions: VBus = 52V 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 70m 100m 200m 500m 1 2 5 10 20 50 100 W Sweep Trace Color Line Style Thick Data Axis 1 1 1 3 Red Blue Solid Solid 3 3 Anlr.THD+N Ratio Anlr.THD+N Ratio Left Left Comment Amp19.at27 Fig 2 www.irf.com IRAUDAMP19 REV 3.0 Page 5 of 14 200 Frequency Response Test Conditions: VBus = 52V Set Output = 1W Load Impedance = 4 ohms +4 +3 +2 +1 -0 -1 d B r -2 A -4 -3 -5 -6 -7 -8 -9 -10 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k 200k Hz Sweep Trace Color Line Style Thick Data Axis 1 1 1 2 Red Blue Solid Solid 3 3 Anlr.Level A Anlr.Level B Left Left Comment Amp19FR.at27 Fig 3 Noise Floor Test Conditions: VBus = 52V Load Impedance = 4 ohms No Input Signal +20 +10 +0 -10 -20 -30 -40 -50 d B V -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 10 20 50 100 200 500 1k 2k 5k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis 1 1 1 2 Red Blue Solid Solid 3 3 Fft.Ch.1 Ampl Fft.Ch.2 Ampl Left Left Comment Amp19FTT,Flloor noise.at27 Fig 4 www.irf.com IRAUDAMP19 REV 3.0 Page 6 of 14 Noise Floor with 1Vrms Output Test Conditions: VBus = 52V Output = 1Vrms @ 1 KHz Load Impedance = 4 ohms +0 -10 -20 -30 -40 -50 d B V -60 -70 -80 -90 -100 -110 10 20 50 100 200 500 1k 2k 5k 10k Hz Fig 5 www.irf.com IRAUDAMP19 REV 3.0 Page 7 of 14 20k Thermal 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 6 IRAUDAMP19 (Vbus=52V) IR4301’s temperature saturated around 80°C within 30minutes www.irf.com IRAUDAMP19 REV 3.0 Page 8 of 14 SD 10R NM D1 *3.01k 1% C3 1nF R14 330 BS250F 10 Ohm Not mounted Not mounted 10 Ohm R38 R61 47K R10 Dual Supply GND D2 Red LED 3 FET2 CT_SGND 330 1 SD SD R63 CT_PGND C45 R24 C20 4.7uF,10V CT_PGND 470pF, 50V VSS2 C10 22uF, 16V 1nF C16 R65 7 6 5 4 *560 1W VSS CSD COMP IN- IN+ 1 VAA CT_SGND 2 GND 3 10uF C21 Z2*560 1W 5.1V R27 *560 1W VSS CSD COMP IN- IN+ CT_SGND +5V 560 1/2W Z4 5.1V R28 -5V C18 4.7uF,10V R57 -5V 7 6 5 4 3 1 VAA CT_SGND 2 GND 10uF C22 4.7R R29 -B U2 -B 4.7R R30 D10 1N4148 560 1/2W R64 U1 D9 1N4148 560 1/2W R56 52V version Z1*560 1W 5.1V R25 CT_SGND +5V 560 1/2W Z3 5.1V R26 1nF C15 CT_SGND 2.2nF,50V C14 R22 180R 180R 180R 2.2nF,50V R21 C12 2.2nF,50V 2.2nF,50V C9 C8 R18 68k 1% C17 4.7uF,10V CT_SGND VAA2 4.7uF,10V C19 VSS1 22uF, 16V 2.2nF,50V C13 R20 180R R17 68.1k 1% C44 NM R36 NM C7 2.2nF,50V C6 R23 VAA1 180R 2.2nF,50V R19 180R 2.2nF,50V 10R CT_PGND CT_PGND *3.01k 1% C4 1nF R13 1 C5 C11 R16 68.1k 1% *3.01k 1% C2 1nF *3.01k 1% C1 1nF R12 R7 CT_SGND R8 Prot2 2.2uF CP4 2.2uF CP3 47K R9 Red LED BS250F 3 FET1 CT_SGND 330 Single Supply INPUT GND R61 SD 10k R2 330 CT_SGND R6 Prot1 2.2uF INPUT GND R38 CT_SGND CT_PGND CN1 1 3 5 4 2 10k CT_SGND R1 2.2uF CP2 R15 68.1k 1% 13 R11 14 CSH R5 12 SCH_IR4301_Single Supply Rev2.3 VS PQFN VS PQFN VCC 11 VCC 11 R33 VS1 R34 11V Z5 10k R62 R32 4.7R DS1 VS2 560 1/2W Q1 MJD44H11T4G 2 R37 33K D4 C24 1N4148 22uF 22uF CP5 3 R31 4.7R 33K D3 C23 1N4148 22uF 1 100k R3 100k R4 C29 +B R42 1R 0.1uF,100V C30 R39 560 1/2W R41 1R 0.1uF,100V D8 CH2_OUT D7 22uH C36 0.47uF, 400V L2 0.1uF,100V C32 D6 CH1_OUT D5 22uH C35 0.47uF, 400V L1 0.1uF,100V C31 GND CT_PGND GND RCH 1 2 P3 +B CT_PGND LCH 1 2 P1 +B C39 CT_SGND C42 2200uF, 63V Z5 36V 41-52V 560Ohm R55 10k GND 27V 390ohm 30-41V 1 2 P2 GND R58 47k CT_PGND +B +30-52V CT_PGND Z7* 56V +B C43 GND C40 2200uF, 63V 0.1uF,100V 0.1uF,100V GND C41 0.1uF R53 47k R54 10k +B R25~R28,R56 R57,R64,R65 - + 4 6 ON SW SPDT 5 3 2 Power Supply * Voltage Range SD CT_PGND OFF S1 1 OVP CP1 2 2 R35 9.1k VB 15 COM 9 13 VB R40 9.1k VP O VN 10 12 VCC 8 14 CSH VCC 8 15 COM 9 R48 VP O VN 10 R49 2.2k R50 2.2k R47 10, 1W C37 0.1uF, 63V 10, 1W C38 IRAUDAMP19 REV 3.0 0.1uF, 63V Q3 MMBT5551 R51 10k, 1/2W 10k, 1/2W R52 Q4 MMBT5551 www.irf.com Z8 *36V R60 47k R59 10k +B UVP Class D, AMP19 Schematic Schematic Fig7 Page 9 of 14 Bill of Materials No 1 490-1494-1-ND 2 3 4 445-1309-1-ND Designator C1, C2, C3, C4, C15, C16 C5, C6, C8, C9, C11, C12, C13, C14 587-1433-1-ND C7, C10 CAP CER 22UF 16V X5R 1206 2 Digikey 478-1429-1-ND C17, C18, C19, C20 4 Digikey 5 399-3525-1-ND C21, C22 2 Digikey 6 445-6797-1-ND C23, C24 2 Digikey 7 445-1418-1-ND C29, C30 2 Digikey 8 445-1377-1-ND C31, C32, C39, C40 4 Digikey 9 495-1315-ND C35, C36 2 Digikey 10 BC2054-ND C37, C38 2 Digikey 11 311-1140-1-ND C41 1 Digikey 12 565-1137-ND C42, C43 2 Digikey 13 311-1124-1-ND C45 1 Digikey 14 CP1-3545N-ND CN1 1 Digikey 15 565-1103-ND CP1, CP2, CP3, CP4 4 Digikey 16 565-1056-ND CP5 1 Digikey 17 1N4148WS-FDICT-ND D1, D2 2 Digikey 18 19 1N4148WDICT-ND D3, D4, D9, D10 CAP CER 4.7UF 10V Y5V 0805 CAP CERAMIC 10UF 16V X7R 1206 CAP CER 22UF 16V 10% X5R 0805 CAP CER .10UF 100V X7R 10% 0805 CAP CER 0.1UF 100V 10% X7R 1206 CAP FILM 0.47UF 400VDC RADIAL CAP FILM MKP .1UF 63VDC 2% CAP .10UF 50V CERAMIC X7R 0805 CAP ALUM 2200UF 63V 20% RADIAL CAP 470PF 50V CERAMIC X7R 0805 CONN JACK STEREO R/A 5PIN 3.5MM CAP ALUM 2.2UF 50V 20% RADIAL CAP 22UF 25V ELECT VR RADIAL DIODE SWITCH 75V 200MW SOD323 DIODE SWITCH 100V 400MW SOD-123 4 Digikey S1DFSCT-ND D5, D6, D7, D8 4 Digikey 20 160-1647-1-ND DS1 1 Digikey 21 BS250FCT-ND FET1, FET2 2 22 7G14A-220M-B L1, L2 2 Digikey Inductors, Inc 23 281-1414-ND P1, P3 2 Digikey 24 281-1414-ND P2 1 Digikey 25 Prot1, Prot2 2 Digikey 26 160-1182-1-ND MJD44H11T4GOSCTND Q1 1 Digikey 27 MMBT5551FSCT-ND Q3, Q4 2 Digikey 28 R1, R2, R62 3 Digikey R3, R4 2 Digikey 30 311-10KGRCT-ND RMCF0603JT100KCTND RMCF0603JT330RCTND 4 Digikey 31 RHM47KGCT-ND R9, R10 2 Digikey 32 RHM3.01KCRCT-ND RMCF0805FT68K1CTND R11, R12, R13, R14 4 Digikey 4 Digikey 29 33 Part Number www.irf.com R5, R6, R7, R8 R15, R16, R17, R18 Description CAP CER 1000PF 50V 10% X7R 0603 CAP CER 2200PF 50V X7R 10% 0603 6 Digikey 8 Digikey DIODE GP 200V 1A DO214AC LED BLUE CLEAR THIN 0603 SMD MOSFET P-CH 45V 90MA SOT23-3 Class D Inductor, 22UH CONN TERM BLOCK PCB 5.0MM 2POS CONN TERM BLOCK PCB 5.0MM 2POS LED RED ORANGE CLEAR 0603 SMD TRANS PWR NPN 8A 80V DPAK TRANSISTOR NPN 160V SOT23 RES 10K OHM 1/10W 5% 0603 SMD RES 100K OHM 1/10W 5% 0603 SMD RES 330 OHM 1/10W 5% 0603 SMD RES 47K OHM 1/10W 5% 0603 SMD RES 3.01K OHM 1/8W 1% 0805 SMD RES 68.1K OHM 1/8W 1% 0805 SMD IRAUDAMP19 REV 3.0 Quantity Vendor Page 10 of 14 R19, R20, R21, R22, R23, R24 34 RHM180GCT-ND 35 RHM560BCCT-ND 36 560H-ND R25, R27, R57, R65 R26, R28, R37, R39, R56, R64 37 P4.7ACT-ND R29, R30, R31, R32 38 RHM33KGCT-ND R33, R34 39 RHM9.1KARCT-ND R35, R40 40 1.1KW-1-ND R37 41 923345-06-ND JW1 42 P1.0ACT-ND R41, R42 43 R47, R48 44 541-10.0AFCT-ND RMCF0805JT2K20CTND R49, R50 45 541-10KVCT-ND R51, R52 46 RHM47KARCT-ND R53, R58, R60 47 RHM10KARCT-ND R54, R55, R59 48 311-10ARCT-ND R61 49 311-10ARCT-ND R63 50 360-1758-ND S1 51 IR4301M U1, U2 52 DDZ5V1BDICT-ND Z1, Z2, Z3, Z4 53 Z5 54 BZT52C11-FDICT-ND MMSZ5263BT1GOSCTND Z7 55 BZT52C36-FDICT-ND Z8* RES 180 OHM 1/10W 5% 0603 SMD RES 560 OHM 1W 5% 2512 SMD RES 560 OHM 1/2W 5% AXIAL RESISTOR 4.7 OHM 1/8W 5% 0805 RES 33K OHM 1/10W 5% 0603 SMD RES 9.1K OHM 1/8W 5% 0805 SMD RES 1.1K OHM 1W 5% METAL OXIDE JUMPER WIRE 0.6" LONG PKG OF 150 RESISTOR 1.0 OHM 1/8W 5% 0805 RES 10.0 OHM 1W 1% 2512 SMD RES 2.2K OHM 1/8W 5% 0805 SMD RES 10K OHM 1/2W 5% 1210 SMD RES 47K OHM 1/8W 5% 0805 SMD RES 10K OHM 1/8W 5% 0805 SMD RES 10 OHM 1/8W 5% 0805 SMD RES 10 OHM 1/8W 5% 0805 SMD SWITCH TOGGLE SPDT .4VA SEAL PCB 1 CH PowIRaudio integrated Class D IC DIODE ZENER 5.1V 500MW SOD-123 DIODE ZENER 11V 500MW SOD123 DIODE ZENER 56V 500MW SOD123 DIODE ZENER 36V 500MW SOD123 6 Digikey 4 Digikey 6 Digikey 4 Digikey 2 Digikey 2 Digikey 2 Digikey 1 Digikey 2 Digikey 2 Digikey 2 Digikey 2 Digikey 3 Digikey 3 Digikey 1 Digikey 1 Digikey 1 Digikey 2 IR 4 Digikey 1 Digikey 1 Digikey 1 Digikey *BOM is for 41V-52V power supply IRAUDAMP19 can be powered by 30V-41V supply with modifications of power resistors and UVP zener as below. Power supply voltage 41-52V 30-41V R25~R28,R56,R57,R 64,R65 560 ohm 390 ohm Z5 36V 27V www.irf.com IRAUDAMP19 REV 3.0 Page 11 of 14 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 IRAUDAMP19 REV 3.0 Page 12 of 14 PCB Layout Top side: Fig 8 Bottom side: Fig 9 Note: Refer to AN1170 for footprint and board mounting details. www.irf.com IRAUDAMP19 REV 3.0 Page 13 of 14 Revision changes descriptions Revision Rev 1.0 Rev 2.0 Rev 3.0 Changes description Released 100W version Housekeeping’s power resistors have been changed from 1.2kohm to 560ohm Date May, 16 2012 April, 26 2013 October,24 2014 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 IRAUDAMP19 REV 3.0 Page 14 of 14