IRAUDAMP15 35W/4Ω x 2 Channel Class D Audio Power Amplifier Using the IR4311 By Jun Honda, Liwei Zheng CAUTION: International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP15 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 IRAUDAMP15 REV 1.0 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 SCHEMATIC ....................................................................................9 BILL OF MATERIALS ....................................................................10 PCB SPECIFICATIONS.................................................................11 REVISION CHANGES DESCRIPTIONS .......................................13 www.irf.com IRAUDAMP15 REV 1.0 Page 2 of 13 Introduction The IRAUDAMP15 reference design is a two-channel, 35W/ch half-bridge Class D audio power amplifier with single power supply. This reference design demonstrates how to use the IR4311 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 two-channel design is scalable for power and the number of channels. Applications Docking station audio systems PC audio systems Musical instruments Karaoke amplifiers Game consoles Powered speaker systems Car audio amplifiers Features Output Power: Multiple Protection Features: PWM Modulator: 35W x 2 channels (4Ω load) 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 18-31V* Load Impedance 2-4Ω Self-Oscillating Frequency 400kHz Gain Setting 21.4dB Notes / Conditions Resistive load No input signal, Adjustable 1Vrms input yields rated power Electrical Data Typical Notes / Conditions IR Devices Used IR4311 PowIRaudio integrated Class D IC Modulator Self-oscillating, second order sigma-delta modulation, analog input Single power supply; Power Supply Range 18-31V* Output Power CH1-2: (1% THD+N) 26W 1kHz Output Power CH1-2: (10% THD+N) 35W 1kHz Rated Load Impedance 2-4Ω Resistive load Idling Supply Current 90mA No input signal Total Idle Power Consumption 2.8W No input signal Distortion 0.02% THD+N @ 5W, 4Ω Residual Noise IHF-A weighted, AES-17 filter 230V Single-channel driven, 35W, Class D Channel Efficiency 96% stage *Power Supply Voltage Range *R25~R28 www.irf.com 18~27V 27~37V 220Ω 470Ω IRAUDAMP15 REV 1.0 Page 3 of 13 Connection Setup 18-31V, 3A DC supply 100W, Non-inductive Resistors 4 Ohm 4 Ohm P1 P3 P2 CH1 Output CH2 Output IR4311 FAULT Indicator SW1:PWM Shutdown/MUTE Power Indicator IR4311 FAULT Indicator SW1 CN1 Audio Input Audio Signal Generator Fig 1 Typical Test Setup Connector Description Audio IN POWER CH1 OUT CH2 OUT www.irf.com CN1 P2 P1 P3 Analog input for CH1 and CH2 Single supply Output for CH1 Output for CH2 IRAUDAMP15 REV 1.0 Page 4 of 13 Test Procedures Test Setup: 1. 2. 3. 4. 5. 6. 7. 8. Connect 4, 100W 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 18-31V 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 31V. 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 = 31V 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 0.01 0.005 0.002 0.001 20m 50m 100m 200m 500m 1 2 5 10 20 W Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 3 Red Blue Solid Solid 2 2 Anlr.THD+N Ratio Anlr.THD+N Ratio Left Left Ch1 4ohms 31V Ch2 4ohms 31V Fig 2 www.irf.com IRAUDAMP15 REV 1.0 Page 5 of 13 40 Frequency Response Test Conditions: VBus = 31V Set Output = 1V Load Impedance = 4 ohms +4 T +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 Red Blue Solid Solid 2 2 Anlr.Level A Anlr.Level B Left Left Ch1 4ohm SP 25V Ch2 4ohm SP 25V Fig 3 Noise Floor Test Conditions: VBus = 31V 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 Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 2 Red Blue Solid Solid 2 2 Fft.Ch.1 Ampl Fft.Ch.2 Ampl Left Left Ch1 Ch2 Fig 4 www.irf.com IRAUDAMP15 REV 1.0 Page 6 of 13 Noise Floor with 1Vrms Output Test Conditions: VBus = 31V 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 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 2 Red Blue Solid Solid 2 2 Fft.Ch.1 Ampl Fft.Ch.2 Ampl Left Left Ch1 4ohm Ch1 4ohm Fig 5 Efficiency 100.0% 90.0% 80.0% Efficiency 70.0% 60.0% 50.0% 40.0% 30.0% 20.0% 10.0% 0.0% 0 5 10 15 20 25 30 35 40 Power (W) Fig 6 www.irf.com IRAUDAMP15 REV 1.0 Page 7 of 13 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 7 IRAUDAMP15 (Vbus=31V) IR4311’s temperature saturated around 85°C within 30minutes www.irf.com IRAUDAMP15 REV 1.0 Page 8 of 13 SD 2.2uF 10R INPUT GND R61 NM SD 4.7k R2 Red LED GND D2 330 1k R63 1 CT_PGND C45 C6 C7 22uF, 16V SD CT_PGND 470pF, 50V 180R 2.2nF,50V C14 R22 180R C10 22uF, 16V 2.2nF,50V C9 R24 180R 2.2nF,50V R21 C12 2.2nF,50V C8 R18 47.5k 1% VAA2 2.2nF,50V C13 R20 180R R17 47.5k 1% C44 NM R36 NM SD 2.2nF,50V 10R CT_PGND CT_PGND R10 BS250F 3 FET2 Audio Gnd 1 *3.01k 1% C4 1nF R13 *3.01k 1% C3 1nF R14 330 1 R7 1k R9 CT_SGND Prot2 2.2uF CP4 2.2uF CP3 3 FET1 BS250F R23 VAA1 180R 2.2nF,50V R19 180R 2.2nF,50V C5 C11 R16 47.5k 1% *3.01k 1% C1 1nF R12 *3.01k 1% C2 1nF R15 47.5k 1% R11 Audio Gnd 1 CT_SGND R8 Red LED D1 330 CT_SGND Prot1 2.2uF CT_SGND R6 330 R5 C17 CT_SGND +5V 4.7uF,10V 10uF C22 Z4*470R 1W 5.1V R26 VSS CSD COMP IN- IN+ CT_SGND -5V 7 6 5 4 3 U2 -B 4.7R R30 -B 4.7R R29 D10 1N4148 U1 D9 1N4148 Z2 *470R 1W 5.1V R28 10uF C21 Z3*470R 1W 5.1V R25 VSS CSD COMP IN- IN+ 1 VAA CT_SGND 2 GND C20 VSS2 1nF 7 6 5 4 3 CT_SGND 4.7uF,10V C16 +5V CT_SGND -5V C18 4.7uF,10V C19 VSS1 1nF C15 R27 VS PQFN VS PQFN 11 VCC 11 VCC 18V-31V version Z1 *470R 1W 5.1V 1 VAA CT_SGND 2 GND 4.7uF,10V 14 SCH_IR4311_Single Supply Rev2.4 12 VP CP2 INPUT GND NM R39 R38 CT_SGND CT_PGND CN1 1 3 5 4 2 4.7k CT_SGND R1 100k R3 100k R4 Q1 MJD44H11T4G 2 VS1 R34 11V R35 4.7k +B Z5 R62 5.1k R32 4.7R DS1 VS2 2.7K D4 C24 1N4148 0.1uF 22uF CP5 3 R31 4.7R 2.7K D3 C23 1N4148 0.1uF R33 R41 1R R42 1R C32 NM 0.1uF NM 0.1uF C30 C31 C29 C36 0.47uF, 400V L2 22uH C35 0.47uF, 400V L1 22uH 0.1uF, 63V C38 R48 10, 1W CH2_OUT 0.1uF, 63V C37 R47 10, 1W CH1_OUT D8 D7 D6 D5 +B GND CT_PGND GND RCH 1 2 P3 18-31V Bus +B CT_PGND LCH 1 2 P1 18-31V Bus * Z7 33V R54 10k +B CH1 18-27V 27-31V 470 Ohm 1 2 P2 GND R58 47k CT_PGND R55 10k GND +B C43 GND 2200uF, 25V C42 2200uF, 25V +B CT_PGND 220ohm NM C40 C39 CT_SGND NM GND C41 0.1uF R53 47k R25,R26,R27,R28 - + 4 6 ON SW SPDT 5 3 2 Power Supply Voltage Range SD CT_PGND OFF S1 1 OVP CP1 2 2 1 13 13 VB R37 NM NM R43 NM R44 VB 15 COM 9 CSH VCC 8 14 CSH VCC 8 15 COM 9 R49 2.2k R50 2.2k O VN 10 12 VP O VN 10 Q3 MMBT5551 R51 10k, 1/2W 10k, 1/2W R52 C25 470R 1W C26 C27 C28 NM NM NM R45 NM R46 IRAUDAMP15 REV 1.0 NM Q4 MMBT5551 www.irf.com Z8 16V R60 47k R59 10k +B UVP Class D, AMP15 Schematic Schematic Fig8 Page 9 of 13 Bill of Materials No Part Number 1 490-1494-1-ND 2 Designator Description Quantity Vender CAP CER 1000PF 50V 10% X7R 0603 6 Digikey 445-1309-1-ND C1, C2, C3, C4, C15, C16 C5, C6, C8, C9, C11, C12, C13, C14 CAP CER 2200PF 50V X7R 10% 0603 8 Digikey 3 587-1433-1-ND C7, C10 CAP CER 22UF 16V X5R 1206 2 Digikey 4 478-1429-1-ND C17, C18, C19, C20 CAP CER 4.7UF 10V Y5V 0805 4 Digikey 5 399-3525-1-ND C21, C22 CAP CERAMIC 10UF 16V X7R 1206 2 Digikey 6 311-1140-1-ND C23, C24, C41 CAP CER 0.1UF 50V 10% X7R 0805 3 Digikey 7 445-1418-1-ND C29, C30 CAP CER .10UF 100V X7R 10% 0805 2 Digikey 8 495-1315-ND C35, C36 CAP FILM 0.47UF 400VDC RADIAL 2 Digikey Digikey BC2054-ND C37, C38 CAP FILM 0.1UF 63VDC RADIAL 2 10 9 565-1064-ND C42, C43 CAP ALUM 2200UF 25V 20% RADIAL 2 Digikey 11 311-1124-1-ND C45 CAP 470PF 50V CERAMIC X7R 0805 1 Digikey 12 CP1-3545N-ND CN1 CONN JACK STEREO R/A 5PIN 3.5MM 1 Digikey 13 565-1103-ND CP1, CP2, CP3, CP4 CAP ALUM 2.2UF 50V 20% RADIAL 4 Digikey 14 565-1056-ND CP5 CAP 22UF 25V ELECT VR RADIAL 1 Digikey 15 1N4148WS-FDICT-ND D1, D2 DIODE SWITCH 75V 200MW SOD323 2 Digikey 16 1N4148WDICT-ND D3, D4, D9, D10 DIODE SWITCH 100V 400MW SOD-123 4 Digikey 17 160-1647-1-ND DS1 LED BLUE CLEAR THIN 0603 SMD 1 Digikey 18 BS250FCT-ND FET1, FET2 MOSFET P-CH 45V 90MA SOT23-3 2 19 Sagami 7G13A-220M-R L1, L2 Class D Inductor, 22UH 13A 2 Digikey Inductors, Inc 20 281-1414-ND P1, P2, P3 CONN TERM BLOCK PCB 5.0MM 2POS 3 Digikey 21 160-1182-1-ND Prot1, Prot2 LED RED ORANGE CLEAR 0603 SMD 2 Digikey 22 MJD44H11T4GOSCT-ND Q1 TRANS PWR NPN 8A 80V DPAK 1 Digikey 23 MMBT5551FSCT-ND Q3, Q4 TRANSISTOR NPN 160V SOT-23 2 Digikey 24 RMCF0603JT4K70CT-ND R1, R2 RES 4.7K OHM 1/10W 5% 0603 SMD 2 Digikey 25 RMCF0603JT100KCT-ND R3, R4 RES 100K OHM 1/10W 5% 0603 SMD 2 Digikey 26 RMCF0603JT330RCT-ND R5, R6, R7, R8 RES 330 OHM 1/10W 5% 0603 SMD 4 Digikey 27 RMCF0603JT1K00CT-ND R9, R10 RES 1K OHM 1/10W 5% 0603 SMD 2 Digikey 28 RHM3.01KCRCT-ND R11, R12, R13, R14 RES 3.01K OHM 1/8W 1% 0805 SMD 4 Digikey 29 311-47.5KCRCT-ND R15, R16, R17, R18 RES 47.5K OHM 1/8W 1% 0805 SMD 4 Digikey 30 RHM180GCT-ND R19, R20, R21, R22, R23, R24 RES 180 OHM 1/10W 5% 0603 SMD 6 Digikey 31 RMCF2512JT470RCT-ND R25, R26, R27, R28 RES 470 OHM 1W 5% 2512 SMD 4 Digikey 32 P4.7ACT-ND R29, R30, R31, R32 RESISTOR 4.7 OHM 1/8W 5% 0805 4 Digikey 33 RHM2.7KGCT-ND R33, R34 RES 2.7K OHM 1/10W 5% 0603 SMD 2 Digikey 34 RHM4.7KGCT-ND R35 RES 4.7K OHM 1/10W 5% 0603 SMD 1 Digikey 35 PT470XCT-ND R37 RES 470 OHM 1W 5% 2512 SMD 1 Digikey 36 P1.0ACT-ND R41, R42 RESISTOR 1.0 OHM 1/8W 5% 0805 2 Digikey 37 541-10.0AFCT-ND R47, R48 RES 10.0 OHM 1W 1% 2512 SMD 2 Digikey 38 RMCF0805JT2K20CT-ND R49, R50 RES 2.2K OHM 1/8W 5% 0805 SMD 2 Digikey 39 541-10KVCT-ND R51, R52 RES 10K OHM 1/2W 5% 1210 SMD 2 Digikey 40 RHM47KARCT-ND R53, R58, R60 RES 47K OHM 1/8W 5% 0805 SMD 3 Digikey 41 RHM10KARCT-ND R54, R55, R59 RES 10K OHM 1/8W 5% 0805 SMD 3 Digikey 42 311-10ARCT-ND R61, R63 RES 10 OHM 1/8W 5% 0805 SMD 1 Digikey 43 RMCF0603JT5K10CT-ND R62 1 Digikey 44 360-1758-ND S1 RES 5.1K OHM 1/10W 5% 0603 SMD SWITCH TOGGLE SPDT .4VA SEAL PCB 1 Digikey 45 IR4311 U1, U2 2 CH PowIRaudio integrated Class D IC 2 IR www.irf.com IRAUDAMP15 REV 1.0 Page 10 of 13 46 DDZ5V1BDICT-ND Z1, Z2, Z3, Z4 DIODE ZENER 5.1V 500MW SOD-123 4 47 BZT52C11-FDICT-ND Z5 DIODE ZENER 11V 500MW SOD123 1 Digikey 48 568-3766-1-ND Z7 DIODE ZENER 33V 375MW SOD123F 1 Digikey 49 BZT52C16-FDICT-ND Z8 DIODE ZENER 16V 500MW SOD-123 1 Digikey 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 IRAUDAMP15 REV 1.0 Page 11 of 13 Digikey PCB Layout Top side: Fig 9 Bottom side: Fig 10 Note: Refer to AN1170 for footprint and board mounting details. www.irf.com IRAUDAMP15 REV 1.0 Page 12 of 13 Revision changes descriptions Revision Rev 1.0 Changes description Released Date May, 11 2012 WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105 Data and specifications subject to change without notice. 01/29/2009 www.irf.com IRAUDAMP15 REV 1.0 Page 13 of 13