Infineon IRAUDAMP22 is a highly efficient, two-channel, 50W/2Ω Class D audio power amplifier. It is designed for use in a wide range of audio applications, including AV receivers, home theater systems, mini component stereos, powered speakers, subwoofers, musical instrument amplifiers, and car audio amplifiers.
The IRAUDAMP22 features a number of advanced features, including:
- Self-oscillating half-bridge topology with optional clock synchronization
- Multiple protection features, including over-current protection, over-voltage protection, under-voltage protection, DC-protection, and over-temperature protection
Infineon IRAUDAMP22 is a highly efficient, two-channel, 50W/2Ω Class D audio power amplifier. It is designed for use in a wide range of audio applications, including AV receivers, home theater systems, mini component stereos, powered speakers, subwoofers, musical instrument amplifiers, and car audio amplifiers.
The IRAUDAMP22 features a number of advanced features, including:
- Self-oscillating half-bridge topology with optional clock synchronization
- Multiple protection features, including over-current protection, over-voltage protection, under-voltage protection, DC-protection, and over-temperature protection
www.irf.com Page 1 of 22
IRAUDAMP22 REV 1.0
IRAUDAMP22
50W/2Ω x 2 Channel Class D Audio Power Amplifier
Using the IR4322
By
Jun Honda, Alvin Rojas
CAUTION:
International Rectifier suggests the following guidelines for safe operation and
handling of IRAUDAMP22 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 Page 2 of 22
IRAUDAMP22 REV 1.0
TABLE OF CONTENTS ........................................................ PAGE
INTRODUCTION.................................................................................................................3
SPECIFICATIONS ..............................................................................................................3
CONNECTION SETUP .......................................................................................................4
CONNECTOR DESCRIPTION............................................................................................5
TEST PROCEDURES.........................................................................................................6
PERFORMANCE AND TEST GRAPHS .............................................................................7
THERMAL INFORMATION ..............................................................................................10
SCHEMATIC.....................................................................................................................13
BILL OF MATERIALS ......................................................................................................15
PCB SPECIFICATIONS....................................................................................................18
REVISION CHANGES DESCRIPTIONS ..........................................................................22
www.irf.com Page 3 of 22
IRAUDAMP22 REV 1.0
Introduction
The IRAUDAMP22 reference design is a two-channel, 50W/ch (2Ω/±13.5V; no heatsink)/ 100W/ch
(2Ω/±19V; *with heatsink) half-bridge Class D audio power amplifier. This reference design
demonstrates how to use the IR4322 IC, 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
AV receivers
Home theater systems
Mini component stereos
Powered speakers
Sub-woofers
Musical Instrument amplifiers
Car audio amplifiers
Features
Output Power: 50W x 2 channels (10%THD+N 2Ω load; no heatsink),
100W x 2 channels (10%THD+N 2Ω load; *with 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
DC-protection (DCP),
Over-temperature protection (OTP)
PWM Modulator: Self-oscillating half-bridge topology with optional clock
synchronization
Specifications
General Test Conditions (unless otherwise noted) Notes / Conditions
±12V~±13.5V Bipolar power supply; without heatsink
Supply Voltages ±12V~±19V Bipolar power supply; *with heatsink
Load Impedance 4-2Ω Resistive load
Self-Oscillating Frequency 400kHz No input signal, Adjustable
Gain Setting 23.5dB 1Vrms input yields rated power
Electrical Data Typical Notes / Conditions
IR Devices Used IR4322 PowIRaudio integrated Class D IC
Modulator Self-oscillating, second order sigma-delta modulation, analog input
59W 1kHz, 4Ω load, without heatsink
70W 1kHz, 4Ω load, *with heatsink
50W 1kHz, 3Ω load, without heatsink
92W 1kHz, 3Ω load, *with heatsink
37W 1kHz, 2Ω load, without heatsink
Output Power CH1-2: (1% THD+N)
75W 1kHz, 2Ω load, *with heatsink
www.irf.com Page 4 of 22
IRAUDAMP22 REV 1.0
80W 1kHz, 4Ω load, without heatsink
95W 1kHz, 4Ω load, *with heatsink
69W 1kHz, 3Ω load, without heatsink
120W 1kHz, 3Ω load, *with heatsink
50W 1kHz, 2Ω load, without heatsink
Output Power CH1-2: (10% THD+N)
100W 1kHz, 2Ω load, *with heatsink
Rated Load Impedance 4-2Ω Resistive load
Idling Supply Current ±65mA No input signal
Total Idle Power Consumption 1.5W No input signal
Distortion 0.016% THD+N @ 20W, 2Ω
Residual Noise 240V IHF-A weighted, AES-17 filter
Channel Efficiency 88% Single-channel driven, 50W (With No
heatsink), Class D stage
*With Heatsink with thermal pad BER161-ND
Connection Setup
Figure 1 Typical Test Setup
Volume
J6 J5
J3 J4
J7
R113
S3 S2
CH1
Output CH2
Output
CH1
Input CH2
Input
G
Protection
Normal
S1
12V~13.5V*, 5A DC supply
2 Ohm 2 Ohm
12V~13.5V*, 5A DC supply
250W, Non-inductive Resistors
J8
J9
Audio Signal Generator
IR4322
* With heatsink Power supply
can go up to +/-19V
SW1:PWM Shutdown/MUTE
www.irf.com Page 5 of 22
IRAUDAMP22 REV 1.0
Connector Description
CH1 IN J6 Analog input for CH1
CH2 IN J5 Analog input for CH2
POWER J7 Positive and negative supply (+B / -B)
CH1 OUT J3 Output for CH1
CH2 OUT J4 Output for CH2
EXT CLK J8 External clock sync
DCP OUT J9 DC protection relay output
Audio Precision-Setup:
IRAUDAMP22 and Audio Precision shall be connected according to the Figure below:
Figure 2
+ - + G - -
A B
-
CH1
CH1
AB
Gen
Power Supply
+/- 35V
CH2
+
+
Amp5
+
-
CH2
DB_209_Rev 2.0
4 Ohms4 Ohms
Audio Precision
Bal inputs
IR4322
_
DB
+/-13.V*
AMP22
* With heatsink Power supply
can go up to +/-19V
2 2
www.irf.com Page 6 of 22
IRAUDAMP22 REV 1.0
Test Procedures
Test Setup:
1. Connect 2-250 W dummy loads to output connectors (J3 and J4 as shown on
Figure 1) and parallel it with input of Audio Precision analyzer (AP).
2. Connect Audio Signal Generator to J6 and J5 for CH1 and CH2 respectively (Ap).
3. Set up the dual power supply with voltages of ±12V~±13.5V (up to ±19V with
heatsink); set current limit to 5A.
4. Set switch S1 to middle position (self oscillating).
5. Set volume level knob R130 fully counter-clockwise (minimum volume).
6. Connect the dual power supply to J7. as shown on Figure 1
Power up:
7. Turn ON the dual power supply. The ±B supplies must be applied and removed at
the same time.
8. Red LED (Protection) should turn on almost immediately and turn off after about 3s.
9. Green LED (Normal) then turns on after red LED is extinguished and should stay on.
10. Quiescent current for the positive supply should be 55mA 10mA at +13.5V.
11. Quiescent current for the negative supply should be 65mA 10mA at –13.5V.
12. Push S3 switch (Trip and Reset push-button) to restart the sequence of LEDs
indicators, which should be the same as noted above in steps 9-10.
Functionality Audio Tests:
13. Apply 1V RMS at 1 kHz sinusoidal signal from the Audio Signal Generator.
14. Turn control volume up (R130 clock-wise) to obtain an output reading of 37Watts.
15. For all subsequent tests as shown on the Audio Precision graphs below (Figure 3-
Figure12), the measurements are taken across J3 and J4 with an AES-17 Filter.
Observe that a 1 VRMS input generates an output around THD+N=1% power level.
16. Sweep the audio signal voltage from 15 mVRMS to 1 VRMS.
17. Monitor the output signals at J3/J4 with an oscilloscope. The waveform must be a
non distorted sinusoidal signal with input signal below 1Vrms.
www.irf.com Page 7 of 22
IRAUDAMP22 REV 1.0
Performance and Test Graphs
Power vs THD+N (without heatsink)
Test Conditions:
VBus = ± 13.5V
Input Signal = 1 KHz
Load Impedance = 2 ohms
Set Gain = 1% clipping 37W
Amp21_22 PWR vs THD.at27
ColorSweep Trace Line Style Thick Data Axi s Comment
1 1 Red Solid 3Anlr.THD+N Ratio Left CH1
1 3 Blue Solid 3Anlr.THD+N Ratio Left CH2
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
%
100m 100200m 500m 1 2 5 10 20 50
W
Figure 3
Power vs THD+N (with heatsink)
Test Conditions:
VBus = ± 19V
Input Signal =1 KHz
Load Impedance = 2 ohms
Set Gain = 1% clipping 75W
Amp21_22 PWR vs THD.at27
ColorSweep Trace Line Style Thick Data Axis Comment
1 1 Red Solid 3Anlr.THD+N Ratio Left CH1
1 3 Blue Solid 3Anlr.THD+N Ratio Left CH2
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
%
100m 100200m 500m 1 2 5 10 20 50
W
Figure 4
www.irf.com Page 8 of 22
IRAUDAMP22 REV 1.0
Frequency Response
Test Conditions:
VBus = 13.5V
Set Output = 1V
Load Impedance = 2 ohms
Amp21_22FR.at27
ColorSweep Trace Line Style Thick Data Axi s Comment
1 1 Red Solid 3Anlr.Level A Left CH1
1 2 Blue Solid 3Anlr.Level B Left CH2
-10
+4
-9
-8
-7
-6
-5
-4
-3
-2
-1
-0
+1
+2
+3
d
B
r
A
20 200k50 100 200 500 1k 2k 5k 10k 20k 50k 100k
Hz
Noise Floor
Test Conditions:
VBus = ± 13.5V
Load Impedance = 2 ohms
Set Gain = 1% clipping
No Input Signal
Amp21_22FTT,Flloor noise.at27
ColorSweep Trace Line Style Thick Data Axis Comment
1 1 Red Solid 3Fft.Ch.1 Am p l Left CH1
1 2 Blue Solid 3Fft.Ch.2 Am pl Left CH2
-150
+20
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
+0
+10
d
B
V
10 20k20 50 100 200 500 1k 2k 5k 10k
Hz
Figure 5
Figure 6
www.irf.com Page 9 of 22
IRAUDAMP22 REV 1.0
Noise Floor with 1Vrms Output
Test Conditions:
VBus = ± 13.5V
Output = 1Vrms @ 1 KHz
Load Impedance = 2 ohms
Set Gain = 1% clipping
Amp21_22_FFT_1V.at27
ColorSweep Trace Line Style Thick Data Axis Comment
1 1 Red Solid 3Fft.Ch.1 Ampl Left CH1
1 2 Blue Solid 3Fft.Ch.2 Ampl Left CH2
-110
+0
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
V
10 20k20 50 100 200 500 1k 2k 5k 10k
Hz
Efficiency
Tested with no heat sink
Figure7
Figure8
www.irf.com Page 10 of 22
IRAUDAMP22 REV 1.0
Thermal Information
1) 1/8 Po Thermal information for IRAUDAMP22
Conditions:
Tamb=25°C natural convection cooling
Both Channel Driven 1/8Po continuous 30mins
Temperature measured by infrared camera
IR4322’s temperature saturated ≤85°C within 30minutes
load impedance 1/8 Power(W) THD=1% power(W) THD=10% power(W)
7.44 59 80
4Ω load
*9.28 *70 *95
6.57 50 69
3Ω load
*11.96 *92 *120
4.65 37 50
2Ω load
*9.4 *75 *100
*With heatsink
Figure9
www.irf.com Page 11 of 22
IRAUDAMP22 REV 1.0
2) Peak Power duration (no heatsink)
Test conditions:
1kHz sine wave signal input ; Both channels driven
Fsw=400kHz
LoadZ10%THD
PoWDuration
2Ω 50 Till Thermal Shutdown
3Ω 69 Till Thermal Shutdown
4Ω 80 Till Thermal Shutdown
3) Peak Power duration (With heatsink)
Test conditions:
1kHz sine wave signal input ; Both channels driven
Fsw=400kHz
LoadZ10%THD
PoWDuration
2Ω 100 No Thermal Shutdown
3Ω 120 No Thermal Shutdown
4Ω 95 No Thermal Shutdown
www.irf.com Page 12 of 22
IRAUDAMP22 REV 1.0
4) Heatsink installation
Digikey part#
Thermal pad BER161-ND
Custom fit Heat Sink
BER161-ND
Figure10
21mm
56mm
38mm
www.irf.com Page 13 of 22
IRAUDAMP22 REV 1.0
Schematic
R1 10R
+B
-B
VAA
CH1
R12
4.7R
C14
0.1uF
R16
1R
C8 1nF
CH1 Output to LPF1
+13.5V
-13.5
+5V
-13.5V
VAA
VSS
IN-1
CH1 O
+B
CH1
C16
0.1uF,100V
Class D, Daughter Board IR4322 Module Schematic
9
10
11
12
13
14
15
16
J2A
A26570-ND
1
2
3
4
5
6
J1A
A26568-ND
R4
2.7k 1%
AMP22 SCH_DB_4322 Rev1.3
D5
R5
100R
-B
+B
SD
VCC
R2
10R
VSS
CH2
R11
4.7R
C13
0.1uF
R15
1R
C7 1nF
+13.5V
-5V
SD
C10
10uF,16V
C15
0.1uF,100V
R3
2.7k 1%
IN-2
GND2 SDVSS
VCC
7
8
9
10
11
12
J1B
A26568-ND
CH2 Output to LPF2
-B
CH2
1
2
3
4
5
6
7
8
J2B
A26570-ND
C2
2.2nF,50V
C6
2.2nF,50V
C1
2.2nF,50V
C5
2.2nF,50V
CH2 O
D2
1N4148
R10
4.7R
R6 620R
R7 620R
R14
10K
D4
1N4148
IN-2
C4
10uF,10V C3
10uF,10V
IN-1
R9
10K
VAA
DS2
DS1 R8
10K
VAA
GND1
-B
D1
1N4148
D3
1N4148
R13
10K
-B
-B
C11
0.1uF
C12
0.1uF
C9
10uF,16V
R17
10K
DS3
IN-2
3
COMP2
2
CLIP
1
NC 30
VP2 24
VS2 25
GND
5
VS1 20
CSH2 27
CSH1
16
VB1
17
IN+1
8
VN2 22
NC 29
VP1
19
VS2 23
COM
15
VS1
18
VSS
6
IN-1
9
COMP1
10
IN+2
4
CSD
11
FAULT
12
NC
13
VCC
14
VN1 21
VB2 26
COM 28
VAA
7-B 31
OO
IC1
IR4302
-B
C17 NC
Figure11
J5
R5
4.7R
R13
3.3K 1
2
J3
L1 10uH
R31
47k 1%
R58
100K
J6
R4
100R R14
3.3K
R32
47k 1%
C32
1000uF,25V
C31
1000uF,25V
R57
100K
C27
OPEN
C26
0.1uF, 400V
C28
OPEN
L2 10uH
R48
10, 1W
R34
1K
R33
1K
C18
150pF, 500V
C17
150pF, 500V
CH1 OUT
CH2 OUT
CH2 IN
CH1 IN
1
2
J4
C33
OPEN
C34
OPEN
R39
470
R40
470
R49
2.2k
R3
100R
R1
100K
C2
10uF, 50V
C3
10uF, 50V
R2
100K
R6
4.7R
R7 47R
R8 47R
R9 10R
R10
47R
R11
47R
C1
10uF, 50V
R50
2.2k
R17
22k
R18
22k
C16
33pF
MUTE
C25
0.1uF, 400V
R47
10, 1W
C15
33pF
U374AHC1G04
U474AHC1G04
C19
2.2uF,16V
C20
2.2uF,16V
R27
47R
R28
47R
C23
1uF, 250V
C24
1uF, 250V
-5V
+5V
+5V
+5V
C5
10uF, 50V
C6
10uF, 50V
+5V
CLK
CLK
D5
D7
D8
D6
-B
+B
-B
+B
-B
+B
CH1 O
+B
CH2 O
-B
SD
IN-1
VCC
VCC
OC
IN-2
+5V -5V
-5V
VSS
8
VR0
7
VR1
6
CLK
5
VDD 1
CS 2
SDATA 3
SIMUL 4
U_2
3310S06S
R108
C107
4.7uF, 16V
C108
10nF, 50V
SCLK
SDATAI
C109
4.7uF, 16V
CS
+5V
Control Volume
R55
0.0
R56
0.0
IR432X_ MODULE
CH1 Feedback
CH2 Feedback
+5V
Audio in
Audio in
Z102
Short
R104
0R, 1W
C103
10uF, 50V
IN
GND
OUT
U_5 MC79M05
C102
10uF, 50V
R102
0R, 1W
C101
10uF, 50V
Vin
GND
Vout
U_4 MC78M05
Z101
Short D102
MA2YD2300
D101
MA2YD2300 C104
10uF, 50V
R101
0R, 1W
R103
0R, 1W
-B
-5V+5V
+B
C105
10uF, 50V
R105
10R
C106
10uF, 50V
Vin
GND
Vout
U_6
MC78M12
Z103
Short
Q102
MMBT5401
R107
4.7K
R106
47K
Z104
15V
Q101
FX941
VCC
+B
-B
HS1
VCC P ower Supply +5V Power Supply -5V Power Supply
R71
OPEN
R72
OPEN
Class D, Mother Board Control Volume and Power Supplies Schematic
1
2
3
4
5
6
J1A
7
8
9
10
11
12
J1B
9
10
11
12
13
14
15
16
J2A
1
2
3
4
5
6
7
8
J2B
ZCEN
1
CS
2
SDATAI
3
VD+
4
DGRD
5
SCLK
6
SDATAO
7
MUTE
8
AINL 16
AGNDR 10
AOUTL 14
VA- 13
VA+ 12
AOUTR 11
AGNDL 15
AINR 9
U_?
CS3310
Trace under J7
Chassis Gnd
Heat Sink
VCC UVP
1
2
3
J7
+13.5V
-13.5V
Gnd
+
-
CH1
CH2
+
-
Figure12
www.irf.com Page 14 of 22
IRAUDAMP22 REV 1.0
PROTECTION
R124
10k
R121
47k
R122
47k
CH1 O
CH2 O
Q106
MMBT5401
Q104
MMBT5401
C116
100uF, 16V
R141
47k
NORMAL
R123
1K
Q108
MMBT5551
S1
SW-PB
MUTE
1
2
3
6
5
4
P1
PVT412
1
2
J9
DC_PS
MUTE
Q105 MMBT5551
R125
10K
R126
100K
+B
Q109
MMBT5551
R139
47k
-B
SD
D105
1N4148
R138
4.7k
Z106
18V Z107
10V
R145
47K
R146
47K
Q110
MMBT5551
R144
10k
D107
1N4148
D106
1N4148
C117
100uF, 16V
+5V
R142
68k
+5V
R119
1k
R136
68k
R135
82k
1A
1Y
2A
2Y
3A
3Y
GND
VCC
6A
6Y
5A
5Y
4A
4Y
U_3
74HC14
R120
100R
C114
10nF, 50V
+5V
I
E
S
SW
S3A
SW-3WAY_A-B
R109
1K
R110
100k
C110
1nF, 50V
C112
1200pF, 50V
D103
1N4148
CLK
R116
47R
CLK
I
E
S
SWS3B
SW-3WAY_A-B
EXT. CLK
A24497
J8
BNC
R115
47R
R114
100R
R113
5K POT
R112
820R
C111
100pF, 50V
Q103
MMBT5551
2
1S2
SW_H-L
R111
10K
C113
100pF, 50V
R134
10k
R117
47R
R143
10K
SP MUTE
R118
1k
Trip and restart
R129
6.8k
C115
10uF, 50V
-B
R140
10k
Z105
27V
DC protection
OVP
R132
47k
Q107
MMBT5551
D104
1N4148
R133
47k
DCP
DCP
R127
6.8k
R128
6.8k
R130
47K
R131
47K
R148
10k
R147
47k
Q111
MMBT5401
+B
R149
47K
C119
0.1uF, 50V
UVP
Z108
8.2V
R137
47k
-5V
OT
OT
CStart
Q112
MMBT5551
-5V +5V
Z109
8.2V
R150
47k
R151
47k
+B
Class D, Mother Board Clock and House Keeping Schematic
. Figure13
www.irf.com Page 15 of 22
IRAUDAMP22 REV 1.0
IRAUDAMP22 Bill of Materials
IRAUDAMP22 Daughter Board BOM
No Part Number Designator Description Quantity Vendor
1 490-1500-1-ND C1, C2, C5, C6 CAP CER 2200PF 50V 10% X7R 0603 4 Digikey
2 587-2668-1-ND C3, C4 CAP CER 10UF 10V X7R 10% 0805 2 Digikey
3 399-1082-1-ND C7, C8 CAP 1000PF 50V CERAMICX7R 0603 2 Digikey
4 490-5519-1-ND C9, C10 CAP CER 10UF 16V X6S 0805 2 Digikey
5 445-1418-1-ND C13, C14, C11, C12 CAP CER .10UF 100V X7R 10% 0805 4 Digikey
6 445-1377-1-ND C15, C16 CAP CER .1UF 100V X7R 10% 1206 2 Digikey
7 1N4148W-FDICT-ND D1, D2, D3, D4, D5
DIODE SWITCH 100V 400MW
SOD123 5 Digikey
8 160-1183-1-ND DS1(CLIP) LED GREEN CLEAR 0603 SMD 1 Digikey
9 160-1181-1-ND DS2(FAULT) LED RED CLEAR 0603 SMD 1 Digikey
10 160-1646-1-ND DS3(ON) LED 468NM BLUE CLEAR 0603 SMD 1 Digikey
11 IR4322 IC1 2 CH PowIRaudio integrated Class D IC 1 IR
12 A26568-ND J1A, J1B
CONN HEADER VERT 6POS .100
30AU 2 Digikey
13 A26570-ND J2A, J2B
CONN HEADER VERT .100 8POS
30AU 2 Digikey
14
RMCF0603JT10R0CT-
ND R1, R2 RES 10 OHM 1/10W 5% 0603 SMD 2 Digikey
15
RMCF0603FT2K70CT-
ND R3, R4 RES 2.7K OHM 1/10W 1% 0603 SMD 2 Digikey
16
RMCF0603JT100RCT-
ND R5 RES 100 OHM 1/10W 5% 0603 SMD 1 Digikey
17 RHM620GCT-ND R6, R7 RES 620 OHM 1/10W 5% 0603 SMD 2 Digikey
18 RHM10KGCT-ND R8, R9, R17 RES 10K OHM 1/10W 5% 0603 SMD 3 Digikey
19
RMCF0603JT4R70CT-
ND R10, R11, R12 RES TF 1/10W 4.7 OHM 5% 0603 3 Digikey
20 P10KGCT-ND R13, R14 RES 10K OHM 1/10W 5% 0603 SMD 2 Digikey
21 311-1.0ARCT-ND R15, R16 RES 1.0 OHM 1/8W 5% 0805 SMD 2 Digikey
*Heatsink is an option for IRAUDAMP22 to deliver high power up to 100W/2Ω
IRAUDAMP22 Mother Board BOM
NO Part No Designator Description # Vender
1 565-1106-ND
C1, C5, C6, C101,
C102, C103, C104,
C105, C106, C115 CAP ALUM 10UF 50V 20% RADIAL 10 Digikey
2 565-1103-ND C2, C3 CAP ALUM 2.2UF 50V 20% RADIAL 2 Digikey
3 478-1281-1-ND C15, C16 CAP CER 33PF 100V 5% NP0 0805 2 Digikey
4 338-2598-ND C17, C18 CAP MICA 150PF 500V 5% RADIAL 2 Digikey
5 PCC1931CT-ND C19, C20 CAP CER 2.2UF 16V 10% X7R 1206 2 Digikey
6 PCC104BCT-ND C119 CAP CER 0.1UF 50V 10% X7R 1206 1 Digikey
7 399-5960-ND C23, C24 CAP FILM 1UF 250VDC RADIAL 2 Digikey
8 495-1311-ND C25, C26 CAP FILM 0.1UF 400VDC RADIAL 2 Digikey
9 565-1086-ND C31, C32 CAP ALUM 1000UF 35V 20% RADIAL 2 Digikey
10 PCC2323CT-ND C107, C109 CAP CER 4.7UF 16V 10% X5R 0805 2 Digikey
11 PCC103BNCT-ND C108, C114 CAP CER 10000PF 50V 10% X7R 0805 2 Digikey
12 PCC102CGCT-ND C110 CAP CER 1000PF 50V 5% NP0 0805 1 Digikey
13 PCC101CGCT-ND C111, C113 CAP CER 100PF 50V 5% NP0 0805 2 Digikey
www.irf.com Page 16 of 22
IRAUDAMP22 REV 1.0
14 478-1372-1-ND C112 CAP CER 1200PF 50V 10% X7R 0805 1 Digikey
15 565-1037-ND C116, C117 CAP ALUM 100UF 16V 20% RADIAL 2 Digikey
16 1N4148W-FDICT-ND
D103, D104, D105,
D106, D107 DIODE SWITCH 100V 400MW SOD123 5 Digikey
17 MURA120T3GOSCT-ND D5, D6, D7, D8 DIODE ULTRA FAST 1A 200V SMA 4 Digikey
18 MA2YD2300LCT-ND D101, D102 DIODE SCHOTTKY 25V 1.0A MINI-2P 2 Digikey
19 294-1086-ND HS1 HEATSINK HORZ SIX BLACK TO-220 1 Digikey
20 A32934-ND J1A, J1B CONN RECEPT 6POS .100 VERT DUAL 2 Digikey
21 A32935-ND J2A, J2B CONN RECEPT 8POS .100 VERT DUAL 2 Digikey
22 277-1271-ND or 651-1714971 J3, J4
CONN TERM BLOCK 2POS 9.52MM
PCB 2
Digikey or
Mouser
23 CP-1422-ND J5, J6 CONN RCA JACK R/A BLUE PCB 2 Digikey
24 277-1272-ND or 651-1714984 J7
CONN TERM BLOCK 3POS 9.52MM
PCB 1
Digikey or
Mouser
25 A32248-ND J8 CONN JACK BNC R/A 50 OHM PCB TIN 1 Digikey
26 ED1567 J9
TERMINAL BLOCK 7.50MM VERT
2POS 1 Digikey
27 7G17A-100M-R L1, L2 Class D inductor, 10uH 2
Inductors,
Inc
7G17A-100M-B
Inductors,
Inc
911-1D17A-100M Mouser
28 160-1143-ND NORMAL LED 3MM GREEN TRANSPARENT 1 Digikey
29 PVT412PBF-ND P1
IC RELAY PHOTOVO 400V 140MA
6DIP 1 Digikey
30 160-1140-ND PROTECTION LED 3MM HI-EFF RED TRANSPARENT 1 Digikey
31 FCX491CT-ND Q101 TRANSISTOR NPN 60V 1A SOT-89 1 Digikey
32 MMBT5401-FDICT-ND
Q102, Q104, Q106,
Q111
TRANS PNP 150V 350MW SMD SOT23-
3 4 Digikey
33 MMBT5551-FDICT-ND
Q103, Q105, Q107,
Q108, Q109, Q110,
Q112
TRANS NPN 160V 350MW SMD
SOT23-3 7 Digikey
34 P100KACT-ND
R1, R2, R57, R58,
R110, R126 RES 100K OHM 1/8W 5% 0805 SMD 6 Digikey
35 P100ACT-ND R3, R4, R114 RES 100 OHM 1/8W 5% 0805 SMD 3 Digikey
36 P4.7ECT-ND R5, R6 RESISTOR 4.7 OHM 1/4W 5% 1206 2 Digikey
37 P47ACT-ND
R7, R8, R10, R11, R27,
R28, R115, R116, R117 RES 47 OHM 1/8W 5% 0805 SMD 9 Digikey
38 P10ACT-ND R9, R105 RES 10 OHM 1/8W 5% 0805 SMD 2 Digikey
39 P3.3KACT-ND R13, R14 RES 3.3K OHM 1/8W 5% 0805 SMD 2 Digikey
40 P22KACT-ND R17, R18 RES 22K OHM 1/8W 5% 0805 SMD 2 Digikey
41 P47KACT-ND
R106, R121, R122,
R130, R131, R132,
R133, R137, R139,
R141, R145, R146,
R147, R149, R150,
R151 RES 47K OHM 1/8W 5% 0805 SMD 16 Digikey
42 P0.0ACT-ND R55, R56 RES 0.0 OHM 1/8W 0805 SMD 2 Digikey
43 P470ACT-ND R39, R40 RES 470 OHM 1/8W 5% 0805 SMD 2 Digikey
44 P100ECT-ND R120 RES 100 OHM 1/4W 5% 1206 SMD 1 Digikey
45 PT47KAFCT-ND R31, R32 RES 47.0K OHM 1W 1% 2512 SMD 2 Digikey
46 P1.0KECT-ND R33, R34 RES 1.0K OHM 1/4W 5% 1206 SMD 2 Digikey
47 P1.0KACT-ND
R109, R118, R119,
R123 RES 1.0K OHM 1/8W 5% 0805 SMD 4 Digikey
48 PT10XCT R47, R48 RES 10 OHM 1W 5% 2512 SMD 2 Digikey
49 P2.2KECT-ND R49, R50 RES 2.2K OHM 1/4W 5% 1206 SMD 2 Digikey
50 541-0.0XCT-ND R101, R102, R103. RES 0.0 OHM 1W Jump 2512 SMD 4 Digikey
www.irf.com Page 17 of 22
IRAUDAMP22 REV 1.0
R104
51 P4.7KACT-ND R107, R138 RES 4.7K OHM 1/8W 5% 0805 SMD 2 Digikey
52 CT2265-ND R108 POT 10K OHM 1/8W CARB VERTICAL 1 Digikey
53 P10KACT-ND
R111, R124, R125,
R134, R140, R143,
R144, R148 RES 10K OHM 1/8W 5% 0805 SMD 8 Digikey
54 P820ACT-ND R112 RES 820 OHM 1/8W 5% 0805 SMD 1 Digikey
55 3362H-502LF-ND R113 TRIMMER 5K OHM 0.5W TH 1 Digikey
56 P6.8KECT-ND R127, R128, R129 RES 6.8K OHM 1/4W 5% 1206 SMD 3 Digikey
57 P82KACT-ND R135 RES 82K OHM 1/8W 5% 0805 SMD 1 Digikey
58 P68KACT-ND R136, R142 RES 68K OHM 1/8W 5% 0805 SMD 2 Digikey
59 P8010S-ND S1 SWITCH TACTILE SPST-NO 0.02A 15V 1 Digikey
60 EG1908-ND S2 SWITCH SLIDE DPDT 12V .1A L=4 1 Digikey
61 EG1944-ND S3 SWITCH SLIDE DP3T .2A L=6MM 1 Digikey
62 296-1089-1-ND U3, U4 IC SNGL INVERTER GATE SOT23-5 2 Digikey
63 73C8016 or 72J5420 U_1
IC, DIGITAL VOLUME CONTROL,
SOIC-16 1 Newark
64 3310-IR01 U_2 CS3310 Stand-alone Controller 1 *Tachyonix
65 296-1194-1-ND U_3 IC HEX SCHMITT-TRIG INV 14-SOIC 1 Digikey
66 MC78M05CTGOS-ND U_4 IC REG VOLT POS 500MA 5V TO220AB 1 Digikey
67 LM79M05CT-ND U_5 IC VOLT REG NEG 5V 500MA TO220-3 1 Digikey
68 LM78M12CT-ND U_6 IC VOLT REG 12V 500MA TO220-3 1 Digikey
69 P0.0ECT-ND Z101, Z102 RES 0.0 OHM 1/4W JUMP 1206 SMD 2 Digikey
70 P0.0ACT-ND Z103 RES 0.0 OHM 1/8W JUMP 0805 SMD 1 Digikey
71 BZT52C15-FDICT-ND Z104 DIODE ZENER 15V 500MW SOD-123 1 Digikey
72 568-6362-1-ND Z105 DIODE ZENER 27V 500MW SOD-123 1 Digikey
73 BZT52C18-FDICT-ND Z106 DIODE ZENER 18V 500MW SOD-123 1 Digikey
74 BZT52C10-FDICT-ND Z107 DIODE ZENER 10V 500MW SOD123 1 Digikey
75 BZT52C8V2-FDICT-ND Z108, Z109 DIODE ZENER 8.2V 500MW SOD-123 2 Digikey
76 10M7578 Volume Knob ROUND KNURLED KNOB, 6MM 1 Newark
77 82K6096
Thermally TO-220
mounting kit with screw THERMALLOY - 4880G - Mounting Kit 3 Newark
78 8401K-ND 1/2" Standoffs 4-40 STDOFF HEX M/F 4-40 .500"L ALUM 5 Digikey
79 H724-ND 4-40 Nut NUT HEX 4-40 STAINLESS STEEL 5 Digikey
80 H729-ND No. 4 Lock Washer WASHER LOCK INTERNAL #4 SS 5 Digikey
*Tachyonix Corporation, http://www.tachyonix.co.jp
www.irf.com Page 18 of 22
IRAUDAMP22 REV 1.0
PCB Specifications
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.
www.irf.com Page 19 of 22
IRAUDAMP22 REV 1.0
Daughter Board
Figure14
Figure15
Note: Refer to AN1170 for footprint and board mounting details.
www.irf.com Page 20 of 22
IRAUDAMP22 REV 1.0
Mother Board
Figure16
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Infineon IRAUDAMP22 is a highly efficient, two-channel, 50W/2Ω Class D audio power amplifier. It is designed for use in a wide range of audio applications, including AV receivers, home theater systems, mini component stereos, powered speakers, subwoofers, musical instrument amplifiers, and car audio amplifiers.
The IRAUDAMP22 features a number of advanced features, including:
- Self-oscillating half-bridge topology with optional clock synchronization
- Multiple protection features, including over-current protection, over-voltage protection, under-voltage protection, DC-protection, and over-temperature protection
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