Infineon Technologies IRAUDAMP8 Manual de usuario
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IRAUDAMP8 REV 1.0
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
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
THERMAL INTERFACE MATERIAL’S PRESSURE CONTROL ................................................................................. 12
POWER SUPPLY REJECTION RATIO (PSRR)............................................................................................ 14
SHORT CIRCUIT PROTECTION RESPONSE .............................................................................................. 15
IRAUDAMP8 OVERVIEW .............................................................................................................................. 16
FUNCTIONAL DESCRIPTIONS..................................................................................................................... 18
IRS2093 GATE DRIVER IC ............................................................................................................................ 18
SELF-OSCILLATING FREQUENCY .................................................................................................................... 19
ADJUSTMENTS OF SELF-OSCILLATING FREQUENCY ......................................................................................... 19
SELECTABLE DEAD-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 1.0
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: 120W x 4 channels,
Residual Noise: 200V, IHF-A weighted, AES-17 filter
Distortion: 0.012% THD+N @ 60W, 4Ω
Efficiency: 90% @ 120W, 4Ω, single-channel driven, Class D stage
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 with optional clock synchronization
Specifications
General Test Conditions (unless otherwise noted) Notes / Conditions
Supply Voltages ±35V
Load Impedance 4Ω
Self-Oscillating Frequency 400kHz No input signal, Adjustable
Gain Setting 26.5dB 1Vrms input yields rated power
Electrical Data Typical Notes / Conditions
IR Devices Used 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 8-4ΩResistive load
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IRAUDAMP8 REV 1.0
Standby Supply Current ±100mA No input signal
Total Idle Power Consumption 7W No input signal
Channel Efficiency 90% Single-channel driven,
120W, Class D stage
.
Audio Performance *Before
Demodula
tor
Class D
Output
Notes / Conditions
THD+N, 1W
THD+N, 10W
THD+N, 60W
THD+N, 100W
0.015%
0.006%
0.005%
0.015%
0.015%
0.008%
0.012%
0.02%
1kHz, Single-channel driven
Dynamic Range 101dB 101dB A-weighted, AES-17 filter,
Single-channel operation
Residual Noise, 22Hz - 20kHzAES17 200V
200V
Self-oscillating – 400kHz
Damping Factor 2000 48 1kHz, relative to 4Ωload
Channel Separation 85dB
85dB
75dB
78dB
77dB
70dB
100Hz
1kHz
10kHz
Frequency Response : 20Hz-20kHz
: 20Hz-35kHz
N/A ±1dB
±3dB 1W, 4Ω- 8ΩLoad
Thermal Performance Typical Notes / Conditions
Idling TC =30C
TPCB=42C
No signal input, TA=25C
4ch x 15W (1/8 rated power) TC =54C
TPCB=71C
Continuous, TA=25C
4ch x 120W (Rated power) TC =80C
TPCB=106C
At OTP shutdown @ 150 sec,
TA=25C
Physical Specifications
Dimensions 3.94”(L) x 2.83”(W) x 0.85”(H)
100 mm (L) x 72 mm (W) x 21.5 mm(H)
Weight 0.140kgm
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IRAUDAMP8 REV 1.0
Connection Setup
Fig 1 Typical Test Setup
Connector Description
CH1 IN CN1 Analog input for CH1
CH2 IN CN1 Analog input for CH2
CH3 IN CN1 Analog input for CH3
CH4 IN CN1 Analog input for CH4
SUPPLY P1 Positive and negative supply (+B / -B)
CH1 OUT P2 Output for CH1
CH2 OUT P2 Output for CH2
CH3 OUT P3 Output for CH3
CH4 OUT P3 Output for CH4
250W,4ΩNon-inductive
CH1 CH2 CH3 CH4
IRS2093
CH2 CH1 +B GND -B CH4 CH3
Output
Input
G
DS1
35 V, 10 A DC supply
35 V, 10 A DC supply
A
udio Si
g
nal Generato
r
Output
VR1
Frequency adjustor ,VCC INDICATOR
IRF6665
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IRAUDAMP8 REV 1.0
Test Procedures
Test Setup:
1. Connect 4-200 W dummy loads to 4 output connectors (P2 and P3 as shown on Fig 1)
and an Audio Precision analyzer (AP).
2. Connect the Audio Signal Generator to CN2 for CH1~CH4 respectively (AP).
3. Set up the dual power supply with voltages of ±35V; current limit to 10A.
4. TURN OFF the dual power supply before connecting to On of the unit under test (UUT).
5. Connect the dual power supply to P1. as shown on Fig 1
Power up:
6. Turn ON the dual power supply. The ±B supplies must be applied and removed at the
same time.
7. The Blue LED should turn ON immediately and stay ON
8. Quiescent current for the positive supply should be 100mA 10mA at +35V.
9. Quiescent current for the negative supply should be 115mA 10mA at –35V.
Switching Frequency test
10. With an Oscilloscope, monitor the switching waveform at test points VS1~VS4. Adjust VR1
to set the self oscillating frequency to 400 kHz 25 kHz.
Functionality Audio Tests:
11. Set the signal generator to 1kHz, 20 mVRMS output.
12. Connect the audio signal generator to CN2(Input of CH1,CH2,CH3,CH4)
13. Sweep the audio signal voltage from 15 mVRMS to 1 VRMS.
14. Monitor the output signals at P2/P3 with an oscilloscope. The waveform must be a non
distorted sinusoidal signal.
15. Observe that a 1 VRMS input generates an output voltage of 21.2 VRMS. The ratio,
R4A/(R3A), determines the voltage gain of IRAUDAMP8.
Test Setup using Audio Precision (Ap):
16. Use an unbalanced-floating signal from the generator outputs.
17. Use balanced inputs taken across output terminals, P2 and P3.
18. Connect Ap frame ground to GND at terminal P1.
19. Select the AES-17 filter(pull-down menu) for all the testing except frequency response.
20. Use a signal voltage sweep range from 15 mVRMS to 1 VRMS.
21. Run Ap test programs for all subsequent tests as shown in Fig 2- Fig 7below.
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IRAUDAMP8 REV 1.0
Performance and test graphs
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
%
100m 200200m 500m 1 2 5 10 20 50 100
W
CH1-Blue; CH2-Yellow; CH3-Red; CH4-Cyan
±B Supply = ±35V, 4 ΩResistive Load
Fig 2 IRAUDAMP8, THD+N versus Power, Stereo, 4 Ω
.
-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
T
CH1-Blue; CH2-Yellow; CH3-Red; CH4-Cyan
±B Supply = ±35V, 4 ΩResistive Load
Fig 3 IRAUDAMP8, Frequency response
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IRAUDAMP8 REV 1.0
0.0001
100
0.0002
0.0005
0.001
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
20
50
%
20 20k50 100 200 500 1k 2k 5k 10k
Hz
Red CH1, 10W Output
Blue CH1, 50W Output
Fig 4 THD+N Ratio vs. Frequency
CH1-Blue; CH2-Yellow; CH3-Red; CH4-Cyan
Fig 5, 1V output Frequency Spectrum
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IRAUDAMP8 REV 1.0
CH1-Blue; CH2-Yellow; CH3-Red; CH4-Cyan
No signal, Self Oscillator @ 400kHz
Fig 6, IRAUDAMP8 Noise Floor
.
-120
+0
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
20 20k50 100 200 500 1k 2k 5k 10k
Hz
Red CH1 – CH2, 60W
Blue CH2 – CH1, 60W
Fig 7, Channel separation vs. frequency
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IRAUDAMP8 REV 1.0
Clipping characteristics
60W / 4, 1kHz, THD+N=0.012% 174W / 4, 1kHz, THD+N=10%
Measured Output and Distortion Waveforms
Fig 8 Clipping Characteristics
.
Red Trace: Total Distortion + Noise Voltage
Green Trace: Output Voltage
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