IRAUDAMP11
120W x 3 Channel Class D Audio Power Amplifier
Using the IRS2053M and IRF6665
By
Jun Honda, Liwei Zheng
CAUTION:
International Rectifier suggests the following guidelines for safe operation and handling of
IRAUDAMP11 Demo board;
Always wear safety glasses whenever operating Demo Board
Avoid personal contact with exposed metal surfaces when operating Demo Board
Turn off Demo Board when placing or removing measurement probes
www.irf.com
IRAUDAMP11 REV
1.0
Page 1 of 35
TABLE OF CONTENTS
PAGE
INTRODUCTION............................................................................................................................................... 3
SPECIFICATIONS ............................................................................................................................................ 3
CONNECTION SETUP ..................................................................................................................................... 5
CONNECTOR DESCRIPTION ......................................................................................................................... 5
TEST PROCEDURES....................................................................................................................................... 6
PERFORMANCE AND TEST GRAPHS .......................................................................................................... 7
CLIPPING CHARACTERISTICS.................................................................................................................... 10
SOFT CLIPPING............................................................................................................................................. 10
EFFICIENCY................................................................................................................................................... 12
THERMAL CONSIDERATIONS ..................................................................................................................... 12
T
HERMAL
I
NTERFACE
M
ATERIAL
’
S
P
RESSURE
C
ONTROL
................................................................................. 13
POWER SUPPLY REJECTION RATIO (PSRR)............................................................................................ 15
SHORT CIRCUIT PROTECTION RESPONSE .............................................................................................. 16
IRAUDAMP11 OVERVIEW ............................................................................................................................ 17
FUNCTIONAL DESCRIPTIONS..................................................................................................................... 19
IRS2053 G
ATE
D
RIVER
IC ............................................................................................................................ 19
S
ELF
-O
SCILLATING
F
REQUENCY
.................................................................................................................... 20
A
DJUSTMENTS OF
S
ELF
-O
SCILLATING
F
REQUENCY
......................................................................................... 20
S
ELECTABLE
D
EAD
-
TIME
................................................................................................................................ 21
PROTECTION SYSTEM OVERVIEW ............................................................................................................ 22
CLICK AND POP NOISE REDUCTION ......................................................................................................... 24
BUS PUMPING............................................................................................................................................... 24
INPUT SIGNAL AND GAIN SETTING ........................................................................................................... 26
GAIN SETTING............................................................................................................................................... 26
IRAUDAMP11 FABRICATION MATERIALS................................................................................................. 28
IRAUDAMP11 HARDWARE .......................................................................................................................... 31
IRAUDAMP11 PCB SPECIFICATIONS......................................................................................................... 32
REVISION CHANGES DESCRIPTIONS........................................................................................................ 35
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IRAUDAMP11 REV
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Introduction
The IRAUDAMP11 Demo board is a reference design which uses only one IC (IRS2053M) to derive
appropriate input signals, amplify the audio input, and achieve a three-channel 120 W/ch (4Ω, THD+N=1%)
half-bridge Class D audio power amplifier. The reference design demonstrates how to use the IRS2053M
Class D audio controller and gate driver IC, implement protection circuits, and design an optimum PCB
layout using IRF6665 DirectFET MOSFETs. The reference design contains all the required housekeeping
power supplies for ease of use. The three-channel design is scalable, for power and number of channels.
Applications
AV receivers
Home theater systems
Mini component stereos
Powered speakers
Sub-woofers
Musical Instrument amplifiers
Automotive after market amplifiers
Features
Output Power:
Residual Noise:
Distortion:
Efficiency:
Multiple Protection Features:
120W x 3 channels (4Ω, THD+N=1%)
or 170W x 3 channels (4Ω, THD+N=10%)
220V, IHF-A weighted, AES-17 filter
0.02% THD+N @ 60W, 4Ω
90% @ 120W, 4Ω, single-channel driven, Class D stage
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 with optional clock synchronization
PWM Modulator:
Specifications
General Test Conditions (unless otherwise noted)
Supply Voltages
±35V
Load Impedance
4Ω
Self-Oscillating Frequency
400kHz
Gain Setting
28dB
Electrical Data
IR Devices Used
Notes / Conditions
No input signal, Adjustable
1Vrms input yields rated power
Typical
Notes / Conditions
IRS2053M Audio Controller and Gate-Driver,
IRF6665 DirectFET MOSFETs
Modulator
Self-oscillating, second order sigma-delta modulation, analog input
Power Supply Range
± 25V to ±35V
Bipolar power supply
Output Power CH1-3: (1% THD+N)
120W
1kHz, ±35V
Output Power CH1-3: (10% THD+N)
170W
1kHz, ±35V
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Rated Load Impedance
Standby Supply Current
Total Idle Power Consumption
Channel Efficiency
.
8-4Ω
+75/-95mA
6W
90%
Resistive load
No input signal
No input signal
Single-channel driven,
120W, Class D stage
Audio Performance
THD+N, 1W
THD+N, 10W
THD+N, 60W
THD+N, 100W
Dynamic Range
Residual Noise, 22Hz - 20kHzAES17
Damping Factor
Channel Separation
Frequency Response : 20Hz-20kHz
: 20Hz-35kHz
Physical Specifications
Dimensions
Weight
Class D
Output
0.015%
0.01%
0.02%
0.03%
101dB
220V
67
75dB
75dB
70dB
±1dB
±3dB
Notes / Conditions
1kHz, Single-channel driven
A-weighted, AES-17 filter,
Single-channel operation
Self-oscillating – 400kHz
1kHz, relative to 4Ω load
100Hz
1kHz
10kHz
1W, 4Ω - 8Ω Load
3.94”(L) x 2.83”(W) x 0.85”(H)
100 mm (L) x 72 mm (W) x 21.5 mm(H)
0.130kgm
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IRAUDAMP11 REV
1.0
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Connection Setup
Audio Signal Generator
CH1 CH2 CH3
Frequency adjustor
VR1
Input
DS1
VCC INDICATOR
IRS2053M
IRF6665
Output
Output
CH2 CH1 +B GND -B CH3
G
250W, 4Ω,
Non-inductive Resistors
35 V, 5 A DC supply
35 V, 5 A DC supply
Fig 1 Typical Test Setup
Connector Description
CH1 IN
CH2 IN
CH3 IN
SUPPLY
CH1 OUT
CH2 OUT
CH3 OUT
CN1
CN1
CN1
P1
P2
P2
P3
Analog input for CH1
Analog input for CH2
Analog input for CH3
Positive and negative supply (+B / -B)
Output for CH1
Output for CH2
Output for CH3
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1.0
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