IRAUDAMP8
120W x 4 Channel Class D Audio Power Amplifier
Using the IRS2093M and IRF6665
By
Jun Honda, Yasushi Nishimura and Liwei Zheng
CAUTION:
International Rectifier suggests the following guidelines for safe operation and handling of
IRAUDAMP8 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
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IRAUDAMP8 REV
1.0
Page 1 of 34
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
EFFICIENCY................................................................................................................................................... 11
THERMAL CONSIDERATIONS ..................................................................................................................... 11
T
HERMAL
I
NTERFACE
M
ATERIAL
’
S
P
RESSURE
C
ONTROL
................................................................................. 12
POWER SUPPLY REJECTION RATIO (PSRR)............................................................................................ 14
SHORT CIRCUIT PROTECTION RESPONSE .............................................................................................. 15
IRAUDAMP8 OVERVIEW .............................................................................................................................. 16
FUNCTIONAL DESCRIPTIONS..................................................................................................................... 18
IRS2093 G
ATE
D
RIVER
IC ............................................................................................................................ 18
S
ELF
-O
SCILLATING
F
REQUENCY
.................................................................................................................... 19
A
DJUSTMENTS OF
S
ELF
-O
SCILLATING
F
REQUENCY
......................................................................................... 19
S
ELECTABLE
D
EAD
-
TIME
................................................................................................................................ 20
PROTECTION SYSTEM OVERVIEW ............................................................................................................ 21
CLICK AND POP NOISE REDUCTION ......................................................................................................... 23
BUS PUMPING............................................................................................................................................... 23
INPUT SIGNAL AND GAIN SETTING ........................................................................................................... 25
GAIN SETTING............................................................................................................................................... 25
SCHEMATIC…………………………………………………………………………………………………………. .26
IRAUDAMP8 FABRICATION MATERIALS................................................................................................... 27
IRAUDAMP8 HARDWARE ............................................................................................................................ 30
IRAUDAMP8 PCB SPECIFICATIONS........................................................................................................... 31
REVISION CHANGES DESCRIPTIONS........................................................................................................ 34
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IRAUDAMP8 REV
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Introduction
The IRAUDAMP8 Demo board is a reference design which uses only one IC (IRS2093M) to derive
appropriate input signals, amplify the audio input, and achieve a four-channel 120 W/ch (4Ω) half-bridge
Class D audio power amplifier. The reference design demonstrates how to use the IRS2093M 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 four-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 4 channels,
200V, IHF-A weighted, AES-17 filter
0.012% 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
26.5dB
Electrical Data
IR Devices Used
Notes / Conditions
No input signal, Adjustable
1Vrms input yields rated power
Typical
Notes / Conditions
IRS2093M 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 CH1-4: (1% THD+N)
120W
1kHz
Output Power CH1-4: (10% THD+N)
170W
1kHz
Rated Load Impedance
8-4Ω
Resistive load
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Standby Supply Current
Total Idle Power Consumption
Channel Efficiency
.
±100mA
7W
90%
No input signal
No input signal
Single-channel driven,
120W, Class D stage
Audio Performance
*
Before
Demodula
tor
0.015%
0.006%
0.005%
0.015%
101dB
200V
2000
85dB
85dB
75dB
N/A
Class D
Output
0.015%
0.008%
0.012%
0.02%
101dB
200V
48
78dB
77dB
70dB
±1dB
±3dB
Notes / Conditions
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
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
Thermal Performance
Idling
4ch x 15W (1/8 rated power)
4ch x 120W (Rated power)
Physical Specifications
Dimensions
Weight
Typical
T
C
=30C
T
PCB
=42C
T
C
=54C
T
PCB
=71C
T
C
=80C
T
PCB
=106C
Notes / Conditions
No signal input, T
A
=25C
Continuous, T
A
=25C
At OTP shutdown @ 150 sec,
T
A
=25C
3.94”(L) x 2.83”(W) x 0.85”(H)
100 mm (L) x 72 mm (W) x 21.5 mm(H)
0.140kgm
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Page 4 of 34
Connection Setup
Audio Signal Generator
CH1 CH2 CH3 CH4
Frequency adjustor
VR1
Input
DS1
,VCC INDICATOR
IRS2093
IRF6665
Output
Output
CH2 CH1 +B GND -B CH4 CH3
G
250W,4ΩNon-inductive
35 V, 10 A DC supply
35 V, 10 A DC supply
Fig 1 Typical Test Setup
Connector Description
CH1 IN
CH2 IN
CH3 IN
CH4 IN
SUPPLY
CH1 OUT
CH2 OUT
CH3 OUT
CH4 OUT
CN1
CN1
CN1
CN1
P1
P2
P2
P3
P3
Analog input for CH1
Analog input for CH2
Analog input for CH3
Analog input for CH4
Positive and negative supply (+B / -B)
Output for CH1
Output for CH2
Output for CH3
Output for CH4
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1.0
Page 5 of 34
PCB设计
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