IRAUDAMP7S
25W-500W Scalable Output Power
Class D Audio Power Amplifier Reference Design
Using the IRS2092S Protected Digital Audio Driver
By
Jun Honda, Manuel Rodríguez, Liwei Zheng
CAUTION:
International Rectifier suggests the following guidelines for safe operation and handling of
IRAUDAMP7S 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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Table of Contents
Introduction of scalable design …………………………………………………..
Power table values for each power model………………………………………
Specifications………………………………………………………………………
Connection setup………………………………………………………………….
Test procedure…………………………………………………………………..…
Performance and test graphs………………………………………………….…
Clipping characteristics……………………………………………………………
Efficiency……………………………………………………………………………
Thermal considerations……………………………………………...……………
PSRR, half bridge, full bridge…………………………………………………….
Short circuit response……………………………………………………………..
IRAUDAMP7S Overview……………………………………………………….…
Functions Descriptions……………………………………………………………
Selectable dead Time…………………………………..…………………………
Protection Features……………………………………………..…………………
Click and pop noise control………………………………………….……………
Bus pumping…………………………………………………….…………………
Bridged configuration……………………………………….……..………………
Input signal and Gain……………………………………….…………………….
Gain settings……………………………………………………………………….
Schematics…………………………………………………………………………
Bill of Materials………………………………………………………………..……
IRAUDAMP7S models differential table………………………………………...
Hardware……………………………………………………………………………
PCB specifications…………………………………………………………………
Assembly Drawings………………………………………………………….……
Revision changes descriptions…………………………………………………..
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Introduction
The IRAUDAMP7S reference design is a two-channel Class D audio power amplifier that features output
power scalability. The IRAUDAMP7S offers selectable half-bridge (stereo) and full-bridge (bridged) modes.
This reference design demonstrates how to use the IRS2092 Class D audio driver IC, along with IR’s digital
audio dual MOSFETs, such as IRFI4024H-117P, IRFI4019H-117P, IRFI4212H-117P and IRFI4020H-117P,
on a single layer PCB. The design shows how to implement peripheral circuits on an optimum PCB layout
using a single sided board.
The resulting design requires a small heatsink for normal operation (one-eighth of continuous rated power).
The reference design provides all the required housekeeping power supplies and protections.
Unless otherwise noted, this user’s manual is based on 150V model, IRAUDAMP7S-150.
Other output power versions can be configured by replacing components given in the component selection
of Table 5 on page 36
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:
Scalable output power from 25W- 500W (see Table 1)
200
μV,
IHF-A weighted, AES-17 filter
0.007 % THD+N @ 60W, 4
Ω
90 % @ 500W, 8
Ω,
Class D stage
Over-current protection (OCP), high side and low side MOSFET
Over-voltage protection (OVP),
Under-voltage protection (UVP), high side and low side MOSFET
DC-protection (DCP),
Over-temperature protection (OTP)
Self-oscillating PWM, half-bridge or full-bridge topologies selectable
PWM topology:
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Table 1
IRAUDAMP7S Specification Table Series
Item
IR Power
FET1A,
MOSFET
FET1B
8
Ω
Half Bridge
4
Ω
Full Bridge
8
Ω
Nominal
+B, -B
Supply
Voltage
Min/Max
+B, -B
Supply
Voltage
Voltage
Gv
Gain
Notes:
•
•
All the power ratings are at clipping power (THD+N = 1 %). To estimate power ratings at
THD+N=10%, multiply them by 1.33
See Table 5 on page 36 for the complete listing of components table.
AMP7S-55
IRFI4024H-117P
25W x 2
50W x 2
100W x 1
±25V
±20V ~ ±28V
20
Model Name
AMP7S-100
AMP7S-150
IRFI4212H-117P
60W x 2
120W x 2
240W x 1
±35V
±28V ~ ±45V
30
IRFI4019H-117P
125W x 2
250W x 2
500W x 1
±50V
±45V ~ ±60V
36
AMP7S-200
IRFI4020H-117P
250W x 2
Not Supported
Not Supported
±70V
±60V ~ ±80V
40
Specifications
General Test Conditions for IRAUDAMP7S-150 (unless otherwise noted)
Power Supply Voltages
± 50V
Load Impedance
4
Ω
Self-Oscillating Frequency
400kHz
Voltage Gain
36
Notes / Conditions
Typical
Notes / Conditions
IR Devices Used
IRS2092, Protected digital audio driver
IRFI4024H-117P, IRFI4019H-117P, IRFI4212H-117P, IRFI4020H-
117P Digital audio MOSFETs
PWM Modulator
Self-oscillating, second order sigma-delta modulation, analog input
Power Supply Range
± 45V to ± 60V
Or see table 1 above
Output Power CH1-2: (1 % THD+N)
300W
1kHz
Output Power CH1-2: (10 % THD+N)
400W
1kHz
Rated Load Impedance
8-4
Ω
Resistive load
Standby Supply Current
+50 mA/-80 mA
No input signal
Total Idle Power Consumption
7W
No input signal
Channel Efficiency
90 %
Single-channel driven, 250W
.
Electrical Data
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Audio Performance
THD+N, 1W
THD+N, 10W
THD+N, 60W
THD+N, 100W
Dynamic Range
Residual Noise
Damping Factor
Channel Separation
Frequency Response : 20 Hz-
20kHz
Before
Demodulator
0.01 %
0.005 %
0.005 %
0.007 %
101 dB
200
μV
2000
95 dB
85 dB
75 dB
20 Hz-35kHz
Class D
Output
0.02 %
0.007 %
0.007 %
0.008 %
101 dB
200
μV
120
90 dB
80 dB
65 dB
±3 dB
Notes / Conditions
1kHz, Single-channel driven
A-weighted, AES-17 filter,
Single-channel operation
22 Hz – 20kHz, AES17 filter
Self-oscillating frequency
400kHz
1kHz, relative to 4
Ω
load
100Hz
1kHz
10kHz
1W, 4
Ω
– 8
Ω
Load
Thermal Performance
(T
A
=25
°C)
Condition
Idling
2 ch x 31W (1/8 rated power)
2 ch x 250W (Rated power)
Typical
T
C
=30
°C
T
PCB
=37
°C
T
C
=54
°C
T
PCB
=67
°C
T
C
=80
°C
T
PCB
=106
°C
Notes / Conditions
No signal input
OTP shutdown after 150 s
Physical Specifications
Dimensions
Weight
5.7”(L) x 4”(W) x 1.25”(H)
145 mm (L) x 100 mm (W) x 35 mm(H)
0.330kgm
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