Page 1
IRAUDAMP19
100W/4Ω x 2 Channel Class D Audio Power Amplifier
Using the IR4301
By
Jun Honda, Liwei Zheng
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
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CAUTION:
IRAUDAMP19 REV 3.0
Page 2
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
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IRAUDAMP19 REV 3.0
Page 3
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: 100W x 2 channels (10%THD+N 4Ω load; no heatsink)
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 Modulator: Self-oscillating half-bridge topology
Specifications
General Test Conditions (unless otherwise noted) Notes / Conditions
Supply Voltages 41V~52V Without heatsink
Load Impedance 2-4Ω Resistive load
Self-Oscillating Frequency 400kHz No input signal, Adjustable
Gain Setting 24.8dB 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
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
250
V
Efficiency 90%
*Can be powered by 30V-41V supply with modifications of power resistors and UVP zener.(Please refer Page4)
Single power supply;
IHF-A weighted, AES-17 filter
Single-channel driven, 100W, Class D
stage
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IRAUDAMP19 REV 3.0
Page 4
Connection Setup
41-52V*, 3A DC supply
P3
P1
P2
250W, Non-inductive Resistors
4 Ohm 4 Ohm
SW1:PWM Shutdown/MUTE
CH1
Output
FAULT
Indicator
IR4301
SW1
CN1
IR4301
Audio
Input
CH2
Output
Power
Indicator
FAULT
Indicator
Audio Signal Generator
Fig 1 Typical Test Setup
Connector Description
Audio IN CN1 Analog input for CH1 and CH2
POWER P2 Single supply
CH1 OUT P1 Output for CH1
CH2 OUT P3 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
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IRAUDAMP19 REV 3.0
Page 5
Test Procedures
Test Setup:
1. Connect 4, 250W load to both output connectors, P1 and P3 and audio analyzer (Ap).
2. Connect Audio Signal Generator to CN1 for CH1 and CH2 respectively (Ap).
3. Connect a single power supply to P2 pre-adjusted to 30-52V as shown on Figure above
4. Turn on the power supply.
5. Turn on SW1 (right side).
6. Blue LED (Normal) stays turning on after RED LED extinguished.
7. With an Oscilloscope, monitor switching waveform at VS of CH1 and CH2.
8. Quiescent current for the power supply should be 55mA 10mA at 52V.
Functionality Audio Tests:
9. Sweep the audio signal voltage from 15 mV
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.
to 1.5 V
RMS
RMS
.
Performance and Test Graphs
Power vs THD+N (without heatsink)
Test Conditions:
Load Impedance = 4 ohms
VBus = 52V
Input Signal=1 kHz
10
5
2
1
0.5
0.2
0.1
%
0.05
0.02
0.01
0.005
0.002
0.001
70m 200100m 200m 500m 1 2 5 10 20 50 100
W
ColorSweep Trac e Line Style Th ick Data Axis Comment
1 1 Red Solid 3 Anlr.TH D+N Rati o Left
1 3 Blue Soli d 3 Anlr.THD+ N Ra tio Left
Amp19.at27
Fig 2
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IRAUDAMP19 REV 3.0
Page 6
Frequency Response
Test Conditions:
Load Impedance = 4 ohms
VBus = 52V
Set Output = 1W
+4
+3
+2
+1
-0
-1
-2
d
B
-3
r
-4
A
-5
-6
-7
-8
-9
-10
20 200k50 100 200 500 1k 2k 5k 10k 20k 50k 100k
ColorSweep Trace Line Style Thi ck Data Axis Com ment
1 1 Red So lid 3 Anlr.Level A Left
1 2 Blue Solid 3 Anlr.Level B Left
Noise Floor
Test Conditions:
Load Impedance = 4 ohms
No Input Signal
VBus = 52V
+20
+10
+0
-10
-20
-30
-40
-50
d
-60
B
-70
V
-80
-90
-100
-110
-120
-130
-140
-150
10 20k20 50 100 200 500 1k 2k 5k 10k
ColorSweep Trace Line Style Thick Data Axis Comment
1 1 Red Solid 3 Fft.Ch.1 Ampl Left
1 2 Blue Solid 3 Fft.Ch.2 Ampl Left
Fig 4
Hz
Amp19FR.at27
Fig 3
Hz
Amp19FTT,Flloor noise.at27
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IRAUDAMP19 REV 3.0
Page 7
Noise Floor with 1Vrms Output
Test Conditions:
Load Impedance = 4 ohms
VBus = 52V
Output = 1Vrms @ 1 KHz
+0
-10
-20
-30
-40
-50
d
B
V
-60
-70
-80
-90
-100
-110
10 20k20 50 100 200 500 1k 2k 5k 10k
Hz
Fig 5
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IRAUDAMP19 REV 3.0
Page 8
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
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IRAUDAMP19 REV 3.0
Page 9
Schematic
+B
+B CT _PGND
2
S1
1
OFF
+B
354
Z8
*36V
R59
10k
R60
47k
UVP
R58
47k
R55
10k
*
Z7
R54
56V
10k
OVP
R53
47k
C41
6
ON
CT_ PGND
0.1uF
SW SPDT
MMBT5551
Q3
SD
L1
C31
0.1uF,100V
GND
MMBT5551
Q4
CT_ SGND CT _PGND
GND
1
2
P1
LCH
CT_PGND
R49 2.2k
C37
D6
D5
R4710, 1W
CH1_OUT
C35
22uH
0.47uF, 400V
0.1uF, 63V
+30-52V
+B
+
GND
1
2
P2
+B
GND
2200uF, 63V
2200uF, 63V
C42
C43
C40
0.1uF,100V
C39
0.1uF,100V
R51 10k, 1/2WR5210k, 1/2W
27V
390ohm
GND
36V
41-52V 30-41V
560Ohm
-
+B
R25~R 28,R56
Power Supply
Z5*R57,R64,R65
Voltage Rang e
1
2
P3
RCH
R50 2.2k
C38
D7
D8
R4810, 1W
CH2_OUT
C36
L2
22uH
0.47uF, 400V
C32
0.1uF,100V
GND
CT_PGND
0.1uF , 63V
C29
0.1uF,100V
22uF
C23
R33
33K
D3
1N4148
PQFN
VP
12
D9
560 1/2W
1N4148
R56
52V version
68.1k 1%
68.1k 1%
R15
R16
R11
R12
C1
1nF
*3.01k 1%
R5
330
R6
CT_ SGND
SCH_IR4301_Single Supply Rev2.3
CP1
Cl ass D, AMP19 Schematic
2.2uF
R3100k
CP2
VB
13
CSH
14
*560 1W
Z1
5.1V
R25
CT_SGND
+5V
C17
4.7uF,10V
R23
180R
VAA1
C11
C5
C2
1nF
*3.01k 1%
330
CT_ SGND
2.2uF
VS1
R31
4.7R
O
-B
U1
15
IN+3GND2VAA
1
4
CT _SGND
C15
1nF
R19
180R
C13
R20 180R
2.2nF,50V
2.2nF,50V
C6
1
FET1
3
BS250F
Prot 1
Red LED
R1
10k
CT_SGND
R41
1R
560 1/2W
R39
+B
R37
560 1/2W
23
MJD44 H11 T4 GQ1
11
VS
COMP
CSD6IN-
5
2.2nF,50V
C7 22uF, 16V
SD
2.2nF,50V
2
R9
47K
D1
SD
INPUT GND
R40 9.1k
R35 9.1k
Z5
1
VN
COM
VCC
VSS
7
-5V
VSS1
5
4
213
CN1
11V
CP5
22uF
VCC
10
R29
4.7R
9
C21
10uF
8
*560 1W
R57
560 1/2W
Z3
5.1V
R26
C19
4.7uF,10V
C44
NM
R36
NM
R64
R27
CT_ SGND
68.1k 1%
68k 1%
R17
R18
R13
R14
C3
1nF
*3.01k 1%
R7
330
R8
CT_ SGND
2.2uF
CP3
CP4
R4100k
C30
0.1uF,100V
22uF
C24
R34
33K
D4
1N4148
PQFN
VP
12
D10
560 1/2W
1N4148
VB
13
CSH
14
*560 1W
Z2
5.1V
CT_SGND
+5V
C18
4.7uF,10V
R24
180R
VAA2
C12
C8
C4
1nF
*3.01k 1%
330
CT_ SGND
2.2uF
VS2
R32
4.7R
O
-B
U2
15
IN+3GND2VAA
1
4
CT _SGND
C16
1nF
R21
180R
C14
R22 180R
2.2nF,50V
2.2nF,50V
C9
1
FET2
3
BS250F
Prot 2
Red LED
R2
10k
CT_ SGND
R42
1R
DS1
R62
10k
11
VS
COMP
5
2.2nF,50V
2.2nF,50V
SD
2
R10
D2
VCC
VN
10
R30
4.7R
COM
9
VCC
C22
10uF
8
CSD6IN-
VSS
7
-5V
VSS2
C10 22uF, 16V
R63
47K
SD
R61
10R
R38
NM
CT_PGND
*560 1W
R65
560 1/2W
Z4
5.1V
R28
CT_ SGND
C20
4.7uF,10V
CT_ PGNDCT _PGND
10R
C45 470pF, 50V
CT _PGND CT_PGND
Dual Supply
10 Ohm
Not mounted
GND
INPUT GND
Single Supply
Not mounted
10 Ohm
R38
R61
Fig7
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IRAUDAMP19 REV 3.0
Page 10
Bill of Materials
No Part Number Designator Description Quantity Vendor
1
490-1494-1-ND
2
445-1309-1-ND
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
6
445-6797-1-ND C23, C24
7
445-1418-1-ND C29, C30
8
445-1377-1-ND C31, C32, C39, C40
9
495-1315-ND C35, C36
10
BC2054-ND C37, C38
11
311-1140-1-ND C41
12
565-1137-ND C42, C43
13
311-1124-1-ND C45
14
CP1-3545N-ND CN1
15
565-1103-ND CP1, CP2, CP3, CP4
16
565-1056-ND CP5
17
1N4148WS-FDICT-ND D1, D2
18
1N4148WDICT-ND D3, D4, D9, D10
19
S1DFSCT-ND D5, D6, D7, D8 DIODE GP 200V 1A DO214AC 4 Digikey
20
160-1647-1-ND DS1
21
BS250FCT-ND FET1, FET2
22
7G14A-220M-B L1, L2 Class D Inductor, 22UH 2
23
281-1414-ND P1, P3
24
281-1414-ND P2
25
160-1182-1-ND Prot1, Prot2
MJD44H11T4GOSCT-
26
ND Q1
27
MMBT5551FSCT-ND Q3, Q4
28
311-10KGRCT-ND R1, R2, R62
RMCF0603JT100KCT-
29
ND R3, R4
RMCF0603JT330RCT-
30
ND R5, R6, R7, R8
31
RHM47KGCT-ND R9, R10
32
RHM3.01KCRCT-ND R11, R12, R13, R14
RMCF0805FT68K1CT-
33
ND R15, R16, R17, R18
C1, C2, C3, C4, C15,
C16
C5, C6, C8, C9, C11,
C12, C13, C14
CAP CER 1000PF 50V 10%
X7R 0603 6 Digikey
CAP CER 2200PF 50V X7R
10% 0603 8 Digikey
CAP CERAMIC 10UF 16V X7R
1206 2 Digikey
CAP CER 22UF 16V 10% X5R
0805 2 Digikey
CAP CER .10UF 100V X7R
10% 0805 2 Digikey
CAP CER 0.1UF 100V 10%
X7R 1206 4 Digikey
CAP FILM 0.47UF 400VDC
RADIAL 2 Digikey
CAP FILM MKP .1UF 63VDC
2% 2 Digikey
CAP .10UF 50V CERAMIC X7R
0805 1 Digikey
CAP ALUM 2200UF 63V 20%
RADIAL 2 Digikey
CAP 470PF 50V CERAMIC
X7R 0805 1 Digikey
CONN JACK STEREO R/A
5PIN 3.5MM 1 Digikey
CAP ALUM 2.2UF 50V 20%
RADIAL 4 Digikey
CAP 22UF 25V ELECT VR
RADIAL 1 Digikey
DIODE SWITCH 75V 200MW
SOD323 2 Digikey
DIODE SWITCH 100V 400MW
SOD-123 4 Digikey
LED BLUE CLEAR THIN 0603
SMD 1 Digikey
MOSFET P-CH 45V 90MA
SOT23-3 2 Digikey
Inductors,
Inc
CONN TERM BLOCK PCB
5.0MM 2POS 2 Digikey
CONN TERM BLOCK PCB
5.0MM 2POS 1 Digikey
LED RED ORANGE CLEAR
0603 SMD 2 Digikey
TRANS PWR NPN 8A 80V
DPAK 1 Digikey
TRANSISTOR NPN 160V SOT23 2 Digikey
RES 10K OHM 1/10W 5% 0603
SMD 3 Digikey
RES 100K OHM 1/10W 5%
0603 SMD 2 Digikey
RES 330 OHM 1/10W 5% 0603
SMD 4 Digikey
RES 47K OHM 1/10W 5% 0603
SMD 2 Digikey
RES 3.01K OHM 1/8W 1% 0805
SMD 4 Digikey
RES 68.1K OHM 1/8W 1% 0805
SMD 4 Digikey
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IRAUDAMP19 REV 3.0
Page 11
34
RHM180GCT-ND
35
RHM560BCCT-ND R25, R27, R57, R65
36
560H-ND
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
541-10.0AFCT-ND R47, R48
RMCF0805JT2K20CT-
44
ND 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
BZT52C11-FDICT-ND Z5
MMSZ5263BT1GOSCT-
54
ND Z7
55
BZT52C36-FDICT-ND Z8*
R19, R20, R21, R22,
R23, R24
R26, R28, R37, R39,
R56, R64 RES 560 OHM 1/2W 5% AXIAL 6 Digikey
RES 180 OHM 1/10W 5% 0603
SMD 6 Digikey
RES 560 OHM 1W 5% 2512
SMD 4 Digikey
RESISTOR 4.7 OHM 1/8W 5%
0805 4 Digikey
RES 33K OHM 1/10W 5% 0603
SMD 2 Digikey
RES 9.1K OHM 1/8W 5% 0805
SMD 2 Digikey
RES 1.1K OHM 1W 5% METAL
OXIDE 2 Digikey
JUMPER WIRE 0.6" LONG
PKG OF 150 1 Digikey
RESISTOR 1.0 OHM 1/8W 5%
0805 2 Digikey
RES 10.0 OHM 1W 1% 2512
SMD 2 Digikey
RES 2.2K OHM 1/8W 5% 0805
SMD 2 Digikey
RES 10K OHM 1/2W 5% 1210
SMD 2 Digikey
RES 47K OHM 1/8W 5% 0805
SMD 3 Digikey
RES 10K OHM 1/8W 5% 0805
SMD 3 Digikey
RES 10 OHM 1/8W 5% 0805
SMD 1 Digikey
RES 10 OHM 1/8W 5% 0805
SMD 1 Digikey
SWITCH TOGGLE SPDT .4VA
SEAL PCB 1 Digikey
1 CH PowIRaudio integrated
Class D IC 2 IR
DIODE ZENER 5.1V 500MW
SOD-123 4 Digikey
DIODE ZENER 11V 500MW
SOD123 1 Digikey
DIODE ZENER 56V 500MW
SOD123 1 Digikey
DIODE ZENER 36V 500MW
SOD123 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
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IRAUDAMP19 REV 3.0
Page 12
PCB Specifications
PCB:
1. Two Layers SMT PCB with through holes
2. 1/16 thickness
3. 2/0 OZ Cu
4. FR4 material
5. 10 mil lines and spaces
6. 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.
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IRAUDAMP19 REV 3.0
Page 13
PCB Layout
Top side:
Bottom side:
Fig 8
Note: Refer to AN1170 for footprint and board mounting details.
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Fig 9
IRAUDAMP19 REV 3.0
Page 14
Revision changes descriptions
Revision Changes description Date
Rev 1.0 Released May, 16 2012
Rev 2.0
Rev 3.0
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
100W version
Housekeeping’s power resistors have been
changed from 1.2kohm to 560ohm
April, 26 2013
October,24 2014
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IRAUDAMP19 REV 3.0
Page 15
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
International Rectifier:
IRAUDAMP19
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