IRAUDAMP12
130W/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 IRAUDAMP12 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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TABLE OF CONTENTS ........................................................ PAGE
INTRODUCTION.................................................................................................................3
SPECIFICATIONS ..............................................................................................................3
CONNECTOR DESCRIPTION............................................................................................5
TEST PROCEDURES.........................................................................................................6
PERFORMANCE AND TEST GRAPHS .............................................................................7
THERMAL INFORMATION ..............................................................................................13
SCHEMATIC.....................................................................................................................18
BILL OF MATERIALS ......................................................................................................20
PCB SPECIFICATIONS....................................................................................................22
REVISION CHANGES DESCRIPTIONS ..........................................................................26
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Introduction
The IRAUDAMP12 reference design is a two-channel, 130W/ch (4Ω/±31V; no heatsink)/ 160W/ch
(4Ω/±34V; *with heatsink) half-bridge Class D audio power amplifier. This reference design
demonstrates how to use the IR4301 IC, implement protection circuits, and design an optimum PCB
layout using PowIRaudio integrated Class D IC. This reference design does not require 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:
Multiple Protection Features:
130W x 2 channels (10%THD+N 4Ω load; no heatsink),
160W x 2 channels (10%THD+N 4Ω load; *with heatsink),
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)
Self-oscillating half-bridge topology with optional clock
synchronization
PWM Modulator:
Specifications
General Test Conditions (unless otherwise noted)
±15V~±31V
Supply Voltages
±15V~±34V
Load Impedance
4-2Ω
Self-Oscillating Frequency
400kHz
Gain Setting
26dB
Notes / Conditions
Bipolar power supply; without heatsink
Bipolar power supply; *with heatsink
Resistive load
No input signal, Adjustable
1Vrms input yields rated power
Typical
Notes / Conditions
IR4301 PowIRaudio integrated Class D IC
Self-oscillating, second order sigma-delta modulation, analog input
100W
1kHz, 4Ω load, without heatsink
130W
1kHz, 4Ω load, *with heatsink
80W
1kHz, 3Ω load, without heatsink
Output Power CH1-2: (1% THD+N)
95W
1kHz, 3Ω load, *with heatsink
55W
1kHz, 2Ω load, without heatsink
70W
1kHz, 2Ω load, *with heatsink
Electrical Data
IR Devices Used
Modulator
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Output Power CH1-2: (10% THD+N)
Rated Load Impedance
Idling Supply Current
Total Idle Power Consumption
Distortion
Residual Noise
Channel Efficiency
130W
160W
100W
120W
70W
90W
4-2Ω
±80mA
4W
0.02%
250V
96%
1kHz, 4Ω load, without heatsink
1kHz, 4Ω load, *with heatsink
1kHz, 3Ω load, without heatsink
1kHz, 3Ω load, *with heatsink
1kHz, 2Ω load, without heatsink
1kHz, 2Ω load, *with heatsink
Resistive load
No input signal
No input signal
THD+N @ 50W, 4Ω
IHF-A weighted, AES-17 filter
Single-channel driven, 130W/*160W(*
with heatsink),
Class D stage
*Tested with heatsink from Digikey, part#:294-1085-ND with thermal pad BER161-ND
Connection Setup
15V~31V*, 5A DC supply
15V~31V*, 5A DC supply
* With heatsink Power supply
can go up to +/-34V
250W, Non-inductive Resistors
4 Ohm
4 Ohm
SW1:PWM Shutdown/MUTE
J3
G
J4
CH1
Output
J7
CH2
Output
S1
J9
IR4301
Protection
J6
J5
J8
S3
Volume
Normal
CH1
Input
CH2
Input
S2
R113
Audio Signal Generator
Figure 1 Typical Test Setup
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Connector Description
CH1 IN
CH2 IN
POWER
CH1 OUT
CH2 OUT
EXT CLK
DCP OUT
J6
J5
J7
J3
J4
J8
J9
Analog input for CH1
Analog input for CH2
Positive and negative supply (+B / -B)
Output for CH1
Output for CH2
External clock sync
DC protection relay output
Audio Precision-Setup
IRAUDAMP12 and Audio Precision shall be connected according to the Figureure below:
A
Gen
B
Audio Precision
+
-
A
B
Bal inputs
+
-
4 Ohms
Power Supply
4 Ohms
+/-31V*
+/- 35V
* With heatsink Power supply
can go up to +/-34V
+
CH1
-
+
G
-
+
CH2
-
DB_209_Rev 2.0
IR4301_DB
CH1
CH2
Amp5
AMP12
Figure 2
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