Reference Design - IRAUDAMP7S

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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IRAUDAMP7S REV 1.3
Page 1 of 42
Item
Table of Contents
Page
1
Introduction of scalable design …………………………………………………..
3
2
Power table values for each power model………………………………………
4
3
Specifications………………………………………………………………………
4-5
4
Connection setup………………………………………………………………….
6
5
Test procedure…………………………………………………………………..…
7
6
Performance and test graphs………………………………………………….…
8-13
7
Clipping characteristics……………………………………………………………
14
8
Efficiency……………………………………………………………………………
14-16
9
Thermal considerations……………………………………………...……………
16
10
PSRR, half bridge, full bridge…………………………………………………….
16-17
11
Short circuit response……………………………………………………………..
17-18
12
IRAUDAMP7S Overview……………………………………………………….…
18-19
13
Functions Descriptions……………………………………………………………
20-22
14
Selectable dead Time…………………………………..…………………………
22
15
Protection Features……………………………………………..…………………
23-25
16
Click and pop noise control………………………………………….……………
25
17
Bus pumping…………………………………………………….…………………
26-27
18
Bridged configuration……………………………………….……..………………
27
19
Input signal and Gain……………………………………….…………………….
29
20
Gain settings……………………………………………………………………….
29
21
Schematics…………………………………………………………………………
30-32
22
Bill of Materials………………………………………………………………..……
33-36
23
IRAUDAMP7S models differential table………………………………………...
37
24
Hardware……………………………………………………………………………
38-39
25
PCB specifications…………………………………………………………………
40
26
Assembly Drawings………………………………………………………….……
41
27
Revision changes descriptions…………………………………………………..
42
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IRAUDAMP7S REV 1.3
Page 2 of 42
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:
PWM topology:
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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
IRAUDAMP7S REV 1.3
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Table 1 IRAUDAMP7S Specification Table Series
Item
IR Power
FET1A,
MOSFET
FET1B
8Ω
Half Bridge
4Ω
Full Bridge
8Ω
Nominal
+B, -B
Supply
Voltage
Min/Max
+B, -B
Supply
Voltage
Voltage
Gv
Gain
AMP7S-55
Model Name
AMP7S-100
AMP7S-150
AMP7S-200
IRFI4024H-117P
IRFI4212H-117P
IRFI4019H-117P
IRFI4020H-117P
25W x 2
50W x 2
100W x 1
60W x 2
120W x 2
240W x 1
125W x 2
250W x 2
500W x 1
250W x 2
Not Supported
Not Supported
±25V
±35V
±50V
±70V
±20V ~ ±28V
±28V ~ ±45V
±45V ~ ±60V
±60V ~ ±80V
20
30
36
40
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.
Specifications
General Test Conditions for IRAUDAMP7S-150 (unless otherwise noted)
Power Supply Voltages
± 50V
Load Impedance
4Ω
Self-Oscillating Frequency
400kHz
Voltage Gain
36
Notes / Conditions
Electrical Data
Typical
Notes / Conditions
IRS2092, Protected digital audio driver
IRFI4024H-117P, IRFI4019H-117P, IRFI4212H-117P, IRFI4020H117P 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
8-4Ω
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
IR Devices Used
.
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IRAUDAMP7S REV 1.3
Page 4 of 42
Audio Performance
THD+N, 1W
THD+N, 10W
THD+N, 60W
THD+N, 100W
Before
Demodulator
0.01 %
0.005 %
0.005 %
0.007 %
Class D
Output
0.02 %
0.007 %
0.007 %
0.008 %
Dynamic Range
101 dB
101 dB
Residual Noise
200 μV
200 μV
Damping Factor
2000
95 dB
85 dB
75 dB
120
90 dB
80 dB
65 dB
±3 dB
Channel Separation
Frequency Response : 20 Hz20kHz
20 Hz-35kHz
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 (TA=25 °C)
Condition
Idling
2 ch x 31W (1/8 rated power)
2 ch x 250W (Rated power)
Typical
TC =30 °C
TPCB=37 °C
TC =54 °C
TPCB=67 °C
TC =80 °C
TPCB=106 °C
Notes / Conditions
No signal input
OTP shutdown after 150 s
Physical Specifications
Dimensions
Weight
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5.7”(L) x 4”(W) x 1.25”(H)
145 mm (L) x 100 mm (W) x 35 mm(H)
0.330kgm
IRAUDAMP7S REV 1.3
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Test Setup
+B, 5A DC supply
-B, 5A DC supply
4 Ohm
4 Ohm
G
SPK1A
CNN1
SPK1B
LED1
A
LED1
B
S1
LED2
A
LED2
BS300
RCA1A
RCA1B
Audio Signal
Fig 1 Typical Test Setup
Connector Description
CH1 IN
CH2 IN
SUPPLY
CH1 OUT
CH2 OUT
RCA1A
RCA1B
CNN1
SPK1A
SPK1B
Analog input for CH1
Analog input for CH2
Positive and negative supply (+B / -B)
Output for CH1
Output for CH2
Switches Descriptions
S1
S300
Shutdown PWM
Half bridge / Full bridge select
Indicator Description
LED1A, B
LED2A,B
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PWM (presence of low side gate signal)
Protection
IRAUDAMP7S REV 1.3
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Test Procedures
Test Setup:
1. On the unit under test (UUT), set switch S1 to OFF and S300 to Stereo positions.
2. Connect 4 Ω-200 W dummy loads to output connectors, SPKR1A and SPKR1B, as shown
on Fig 1.
3. Set up a dual power supply ±50V with 5A current limit
4. Turn OFF the dual power supply before connecting to UUT.
5. Connect the dual power supply to CNN1, as shown in 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 red LEDs (Protections) turn ON immediately and stay on as long as S1 is in OFF
position. Blue LEDs stay OFF.
8. Quiescent current for the positive and negative supplies must be less than 50mA, while S1
is in OFF position. Under this condition, IRS2092 is in shutdown mode.
9. Slide S1 to ON position; after one second delay, the two blue LEDs turn ON and the red
LEDs turns off. The two blue LEDs indicate that PWM oscillation is present. This transition
delay time is controlled by CSD pin of IRS2092, capacitor CP3
10. Under the normal operating condition with no input signal applied, quiescent current for the
positive supply must be less than 50 mA; the negative supply current must be less than
100 mA.
Switching Frequency Test:
11. With an oscilloscope, monitor switching waveform at test points VS1 & VS2 Adjust P1A &
P1B to change self oscillating frequency to 400kHz ± 25kHz.
Note: To change self-oscillating switching frequency, Adjust the potentiometer
resistances of P11A and P11B for CH1 and CH2 respectively.
Audio Functionality Tests:
12. Set the signal generator to 1kHz, 20 mVRMS output.
13. Connect audio signal generators to RCA1A and RCA1B.
14. Sweep the audio signal voltage from 15 mVRMS to 1 VRMS.
15. Monitor the output signals at SPK1A/B with an oscilloscope. Waveform must be a non
distorted sinusoidal signal.
16. Observe 1 VRMS input generates output voltage of 36 VRMS. The ratio, R8/(R7+R2),
determines the voltage gain of IRAUDAMP7S.
17. Set switch S300 to Bridged position.
18. Observe that voltage gain doubles.
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IRAUDAMP7S REV 1.3
Page 7 of 42
Test Setup using Audio Precision (Ap):
19. Use unbalance-floating signal generator outputs.
20. Use balanced inputs taken across output terminals, SPKR1A and SPKR1B.
21. Connect Ap frame ground to GND in terminal CNN1.
22. Place AES-17 filter for all the testing except frequency response.
23. Use signal voltage sweep range from 15 mVRMS to 1 VRMS.
24. Run Ap test programs for all subsequent tests as shown in Fig 2- Fig 13 below.
Test Results
10
5
2
1
0.5
0.2
%
0.1
0.05
0.02
0.01
0.005
0.002
0.001
100m
200m
500m
1
2
5
10
20
50
100
W
Red = CH1, Blue = CH2
±B Supply = ±25V, 4 Ω Resistive Load
Fig 2 IRAUDAMP7S-55, THD+N versus Power, Stereo, 4 Ω
.
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IRAUDAMP7S REV 1.3
Page 8 of 42
10
5
2
1
0.5
0.2
%
0.1
0.05
0.02
0.01
0.005
0.002
0.001
100m
200m
500m
1
2
5
10
20
50
100
200
W
Red = CH1, Blue = CH2
±B Supply = ±35V, 4 Ω Resistive Load
Fig 3 IRAUDAMP7S-100, THD+N versus Power, Stereo, 4 Ω
.
10
5
2
1
0.5
0.2
%
0.1
0.05
0.02
0.01
0.005
0.002
0.001
100m
200m
500m
1
2
5
10
20
50
100
200
500
W
±B Supply = ±35V, 8 Ω Resistive Load, Bridged
Fig 4 IRAUDAMP7S-100, THD+N versus Power, Bridged, 8 Ω
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IRAUDAMP7S REV 1.3
Page 9 of 42
.
10
5
2
1
0.5
0.2
%
0.1
0.05
0.02
0.01
0.005
0.002
0.001
100m
200m
500m
1
2
5
10
20
50
100
200
500
W
Red = CH1, Blue = CH2
±B Supply = ±50V, 4 Ω Resistive Load
Fig 5 IRAUDAMP7S-150, THD+N versus Power, Stereo, 4 Ω
.
10
5
2
1
0.5
0.2
%
0.1
0.05
0.02
0.01
0.005
0.002
0.001
100m
200m
500m
1
2
5
10
20
50
100
200
700
W
±B Supply = ±50V, 8 Ω Resistive Load
Fig 6 IRAUDAMP7S-150, THD+N versus Power, Bridged 8 Ω
.
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IRAUDAMP7S REV 1.3
Page 10 of 42
.
+4
+2
+0
d
B
r
A
-2
-4
-6
-8
-10
20
50
100
200
500
1k
2k
5k
10k
20k
50k
100k 200k
Hz
Red
Blue
CH1 - 4 Ω, 2 V Output referenced
CH1 - 8 Ω, 2 V Output referenced
Fig 8 Frequency Response (All Models)
.
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IRAUDAMP7S REV 1.3
Page 11 of 42
10
T
5
2
1
0.5
0.2
%
0.1
0.05
0.02
0.01
0.005
0.002
0.001
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Red
Blue
CH1, 10W Output
CH1, 50W Output
Fig 9 IRAUDAMP7S-150, THD+N versus Frequency, 4Ω
.
+0
-10
-20
-30
-40
d
B
V
-50
-60
-70
-80
-90
-100
-110
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Red = CH1, Blue = CH2
1V Output
Fig 10 IRAUDAMP7S-150, 1 kHz – 1 V Output Spectrum, Stereo
.
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IRAUDAMP7S REV 1.3
Page 12 of 42
+0
-10
-20
-30
-40
d
B
V
-50
-60
-70
-80
-90
-100
-110
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
1V Output
Fig 11 IRAUDAMP7S-150, 1 kHz - 1V Output Spectrum, Bridged
.
+20
+0
-20
-40
d
B
V
-60
-80
-100
-120
-140
10
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Red
Blue
CH1 - ACD, No signal, Self Oscillator @ 400kHz
CH2 - ACD, No signal, Self Oscillator @ 400kHz
Fig 12 IRAUDAMP7S-150 Noise Floor
.
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IRAUDAMP7S REV 1.3
Page 13 of 42
Clipping characteristics
Red Trace: Total Distortion + Noise Voltage
Gold Trace: Output Voltage
210 W / 4 Ω, 1 kHz, THD+N = 0.02 %
310 W / 4 Ω, 1 kHz, THD+N = 10 %
Measured Output and Distortion Waveforms
Fig 13 Clipping Characteristics
.
Efficiency
Figs 14-19 show efficiency characteristics of the IRAUDAMP7S. The high efficiency is achieved by
following major factors:
1) Low conduction loss due to the dual FETs offering low RDS(ON)
2) Low switching loss due to the dual FETs offering low input capacitance for fast rise and fall
times
3) Secure dead-time provided by the IRS2092, avoiding cross-conduction
100%
90%
Efficiency (%)
80%
70%
60%
25V-4ohms
50%
40%
30%
20%
10%
0%
0
10
20
30
40
Output power (W)
50
60
±B Supply = ±25 V
Fig 14 Efficiency versus Output Power, IRAUDAMP7S-55, 4 Ω, Stereo
.
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IRAUDAMP7S REV 1.3
Page 14 of 42
100%
90%
Efficiency (%)
80%
70%
60%
35V-4ohms
50%
40%
30%
20%
10%
0%
0
20
40
60
80
100
120
140
160
Output power (W)
±B Supply = ±35 V
Fig 15 Efficiency versus Output Power, IRAUDAMP7S-100, 4 Ω, Stereo
.
100%
90%
Efficiency (%)
80%
70%
60%
50%
35V-8ohms-Full bridge
40%
30%
20%
10%
0%
0
50
100
150
200
Output power (W)
250
300
±B Supply = ±35V
Fig 16 Efficiency versus Output Power, IRAUDAMP7S-100, 8 Ω, Bridged
.
90%
Efficiency (%)
80%
70%
60%
50V-4ohms
50%
40%
30%
20%
10%
0%
0
50
100
150
200
250
300
Output power (W)
±B Supply = ±50V
Fig 17 Efficiency versus Output Power, IRAUDAMP7S-150, 4 Ω, Stereo
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IRAUDAMP7S REV 1.3
Page 15 of 42
.
100%
90%
Efficiency (%)
80%
70%
60%
50%
50V-8ohms-Full bridge
40%
30%
20%
10%
0%
0
50
100
150
200
250 300
350
Output power (W)
400
450 500
550
±B Supply = ±50V
Fig 18 Efficiency versus Output Power, IRAUDAMP7S-150, 8 Ω, Bridged
.
100%
90%
Efficiency (%)
80%
70%
60%
70V-8ohms
50%
40%
30%
20%
10%
0%
0
50
100
150
200
Output power (W)
250
300
±B supply = ±70V
Fig 19 Efficiency versus Output Power, IRAUDAMP7S-200, 8 Ω, Stereo
Thermal Considerations
With this high efficiency, the IRAUDAMP7S design can handle one-eighth of the continuous rated
power, which is generally considered to be a normal operating condition for safety standards,
without additional heatsink or forced air-cooling.
Power Supply Rejection Ratio (PSRR)
The IRAUDAMP7S obtains good power supply rejection ratio of -65 dB at 1kHz shown in Fig 20.
With this high PSRR, IRAUDAMP7S accepts any power supply topology as far as the supply
voltages fit in the min and max range.
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IRAUDAMP7S REV 1.3
Page 16 of 42
Red: VAA & VSS are fed by +/-B bus
Green: VAA & VSS are fed by external +/-5 V regulated power supplies.
Fig 20 IRAUDAMP7S Power Supply Rejection Ratio
Short Circuit Protection Response
Figs 21-23 show over current protection reaction time of the IRAUDAMP7S in a short circuit event.
As soon as the IRS2092 detects over current condition, it shuts down PWM. After one second, the
IRS2092 tries to resume the PWM. If the short circuit persists, the IRS2092 repeats try and fail
sequences until the short circuit is removed.
Short Circuit in Positive and Negative Load Current
CSD pin
VS pin
CSD pin
Positive OCP
VS pin
Load current
Load current
Negative OCP
Fig 21 Positive and Negative OCP Waveforms
.
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IRAUDAMP7S REV 1.3
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OCP Waveforms Showing CSD Trip and Hiccup
CSD pin
CSD pin
VS pin
VS pin
Load current
Load current
.
Fig 22 OCP Response with Continuous Short Circuit
.
Actual Reaction Time
OCP Waveforms Showing actual reaction time
.
Fig. 23 High and Low Side OCP current waveform reaction time
IRAUDAMP7S Overview
The IRAUDAMP7S features a self-oscillating type PWM modulator for the lowest component
count, highest performance and robust design. This topology represents an analog version of a
second-order sigma-delta modulation having a Class D switching stage inside the loop. The
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IRAUDAMP7S REV 1.3
Page 18 of 42
benefit of the sigma-delta modulation, in comparison to the carrier-signal based modulation, is that
all the error in the audible frequency range is shifted to the inaudible upper-frequency range by
nature of its operation. Also, sigma-delta modulation allows a designer to apply a sufficient
amount of error correction.
The IRAUDAMP7S self-oscillating topology consists of following essential functional blocks.
• Front-end integrator
• PWM comparator
• Level shifters
• Gate drivers and MOSFETs
• Output LPF
Integrator
Referring to Fig 24 below, the input operational amplifier of the IRS2092 forms a front-end secondorder integrator with R7, C4, C6, P1, and R11. The integrator that receives a rectangular feedback
signal from the PWM output via R8 and audio input signal via R7 generates quadratic carrier
signal in COMP pin. The analog input signal shifts the average value of the quadratic waveform
such that the duty cycle varies according to the instantaneous voltage of the analog input signal.
PWM Comparator
The carrier signal in COMP pin is converted to PWM signal by an internal comparator that has
threshold at middle point between VAA and VSS. The comparator has no hysteresis in its input
threshold.
Level Shifters
The internal input level-shifter transfers the PWM signal down to the low-side gate driver section.
The gate driver section has another level-shifter that level shifts up the high-side gate signal to the
high-side gate driver section.
Gate Drivers and MOSFETs
The received PWM signal is sent to the dead-time generation block where a programmable
amount of dead time is added into the PWM signal between the two gate output signals of LO and
HO to prevent potential cross conduction across the output power MOSFETs. The high-side levelshifter shifts up the high-side gate drive signal out of the dead-time block.
The IRS2092 drives two MOSFETs, high- and low-sides, in the power stage providing the
amplified PWM waveform.
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Output LPF
The amplified PWM output is reconstructed back to analog signal by the output LC LPF.
Demodulation LC low-pass filter (LPF) formed by L1 and C12, filters out the Class D switching
carrier signal leaving the audio output at the speaker load. A single stage output filter can be used
with switching frequencies of 400 kHz and greater; a design with a lower switching frequency may
require an additional stage of LPF.
.
R8
R117
+B
CP4
0V
IN-
.
GND
Modulator
and
Shift level
+
Integrator
HO
VS
VCC
LP Filter
LO
COM
-VSS
-B
R24
CP6
IRS2092
D3
R7
INPUT
0V
VB
COMP
R25
FET1
IRFI4024H-117P
IRFI4212H-117P
IRFI4019H-117P
IRFI4020H-117P
0V
L1
C12
.
+VCC
CP5
R11
0V
C6
C7
C4
+B
+VAA
CP2
-B
R118
.
Fig 24 Simplified Block Diagram of IRAUDAMP7S Class D Amplifier
Functional Descriptions
IRS2092 Gate Driver IC
The IRAUDAMP7S uses IRS2092, a high-voltage (up to 200 V), high-speed power MOSFET
driver with internal dead-time and protection functions specifically designed for Class D audio
amplifier applications. These functions include OCP and UVP. The IRS2092 integrates bidirectional over current protection for both high-side and low-side MOSFETs. The dead-time can
be selected for optimized performance according to the size of the MOSFET, minimizing deadtime while preventing shoot-through. As a result, there is no gate-timing adjustment required
externally. Selectable dead-time through the DT pin voltage is an easy and reliable function which
requires only two external resistors, R26 and R27 as shown on Fig 25 below.
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IRAUDAMP7S REV 1.3
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The IRS2092 offers the following functions.
• PWM modulator
• Dead-time insertion
• Over current protection
• Under voltage protection
• Level shifters
Refer to IRS2092 datasheet and AN-1138 for more details.
VS1
Feedback
VB
IN-
HO
C7
1nF
3
13
+B
D3
12
CP2
22uF
VSS
LO
R20
4.7R
11
R25
2
20R
R13
7
VREF
COM
10
10k
R21
8
OCSET
IRS2092S
DT
9
R26
10R
10k
R27
10k
CP5
22uF
VCC
R23
LED1
10k
Blue
2 R114
3
*MUR120RLG
R30
10, 1W
SPKR1
1
2
R31
2.2k
D6
+
CH1
-
-B
*MUR120RLG
C13
0.1uF, 400V
-B
*1k 1W
TIP31C
Q105
Z102
R115
1
R12
*7.5k
C12
0.47uF, 400V
CP7
VCC
CH1 OUT
CH_OUT
D5
0.1uF,100V
CSD
10uF
6
R118
*3.3k 1W
VS
CP8
*470uF,100V
L1
22uH
10R
5
CP3
Z104
5.6V
COMP
R28
2
4
0.1uF,100V
C6
C4
SD
100R
HS1
4
20R
BS250F
R3
R24
14
C10
10R
1nF
1nF
C9
15
C11
150pF,250V
GND
1
1
FET1
*IRFI4019H-117P
22uF
3
3 FET2
D4
R29
2
100R
CSD1
+B
*9.1k
R19
16
10k
CP6
R11
R14
4.7k
D1
CSH
C14
22uF
5.6V
2K POT
P1
VAA
0.1uF,400V
1
5
CP4
Z103
RED
PROT
*47k
R18
10k
U1
+VAA
*470uF,100V
R22
*3.01K 1%
C2
1nF
100k
C8
330
22uF
R1
*3.3k 1w
R17
R7
150pF,250V
R2
+B
R117
R8
*120k 1%
RCA1 RCA1 CP1
*15k
15V
-B
CP101
22uF
Fig 25 System-level View of IRAUDAMP7S
Self-Oscillating Frequency
Self-oscillating frequency is determined by the total delay time along the control loop of the
system; the propagation delay of the IRS2092, the MOSFETs switching speed, the time-constant
of front-end integrator (P1, R7, R11 R8, C4, C6, C7). Variations in +B and –B supply voltages
also affect the self-oscillating frequency.
The self-oscillating frequency changes with the duty ratio. The frequency is highest at idling. It
drops as duty cycle varies away from 50%.
www.irf.com
IRAUDAMP7S REV 1.3
Page 21 of 42
Adjustments of Self-Oscillating Frequency
Use P1 & R11 to set different self-oscillating frequencies. The PWM switching frequency in this
type of self-oscillating switching scheme greatly impacts the audio performance, both in absolute
frequency and frequency relative to the other channels. In the absolute terms, at higher
frequencies distortion due to switching-time becomes significant, while at lower frequencies, the
bandwidth of the amplifier suffers. In relative terms, interference between channels is most
significant if the relative frequency difference is within the audible range.
Normally, when adjusting the self-oscillating frequency of the different channels, it is suggested to
either match the frequencies accurately, or have them separated by at least 25kHz. Under the
normal operating condition with no audio input signal, the switching-frequency is set around
400kHz in the IRAUDAMP7S.
Selectable Dead-time
The dead-time of the IRS2092 is set based on the voltage applied to the DT pin. Fig 26 lists the
suggested component value for each programmable dead-time between 25 and 105 ns.
All the IRAUDAMP7S models use DT2 (45ns) dead-time.
Dead-time Mode
DT1
DT2
DT3
DT4
R1
<10k
5.6kΩ
8.2kΩ
Open
R2
Open
4.7kΩ
3.3kΩ
<10k
DT/SD Voltage
Vcc
0.46 x Vcc
0.29 x Vcc
COM
Recommended Resistor Values for Dead Time Selection
Dead- time
IRS2092(S)
25nS
>0.5mA
Vcc
45nS
R1
75nS
DT
105nS
R2
0.23xVcc
0.36xVcc
0.57xVcc
Vcc
VDT
COM
Fig 26 Dead-time Settings vs. VDT Voltage
Protection System Overview
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IRAUDAMP7S REV 1.3
Page 22 of 42
The IRS2092 integrates over current protection (OCP) inside the IC. The rest of the protections,
such as over-voltage protection (OVP), under-voltage protection (UVP), speaker DC offset
protection (DCP) and over temperature protection (OTP), are realized externally to the IRS2092
(Fig 27).
In the event that any of these external fault conditions are detected, the external shutdown circuit
will disable the output by pulling down CSD pins, turning on red LEDs, and turning off blue LEDs
(Fig 28). If the fault condition persists, the protection circuit stays in shutdown until the fault is
removed. Once the fault is cleared, the blue LEDs turn on and red LEDs turn off.
TH100 is thermally connected with Heat sink
DCP
R108
CH1_OUT
100k
R109
Q102
2N3906
CH2_OUT
100k
R110
R103
715R
2N3906
R104
4.7k Q101
R101
4.7k
100k
CP100
Q103
2N3906
330uF, 10V
-VSS1
S1
2
+B
-VSS1
OVP
1
3
4
+B
Z100
*68V
R111
10k
Z101
*39V
JW3
R112
47K
UVP
OTP
TH100
2.2k
5
SD
6
SW DPDT
R105
10k
R106
10k
R107
10k
Q104
2N3904
Q100
2N3904
R102
10k
C100
0.1uF
R113
10k
-VSS1
-VSS1
Fig 27 DCP, OTP, UVP and OVP Protection Circuits
.
.
R17
D4
CSH
+B
+
VB
1.2V
BAV19
R19
R18
HO
FET1
+VAA
CSD
VCC
OCSET
-VSS
.
CSD
CP3
.
RED
PROT
FET2
LP Filter
VS
OCREF
5.1V
OCREF
R13
LO
BLUE
R12
LED1
-B
OCSET
COM
Fig 28 Simplified Functional Diagram of OCP and Associated LED Indicators
www.irf.com
IRAUDAMP7S REV 1.3
Page 23 of 42
Over-Current Protection (OCP)
Low-Side Current Sensing
The low-side current sensing feature protects the low side MOSFET from an overload condition in negative
load current by measuring drain-to-source voltage across RDS(ON) during its on state. OCP shuts down the
switching operation if the drain-to-source voltage exceeds a preset trip level.
The voltage setting on the OCSET pin programs the threshold for low-side over-current sensing. When the
VS voltage during low-side conduction gets higher than the OCSET voltage, the IRS2092 turns off outputs
and pulls CSD down to -VSS.
High-Side Current Sensing
The high-side current sensing protects the high side MOSFET from an overload condition in
positive load current by measuring drain-to-source voltage across RDS(ON) during its on state. OCP
shuts down the switching operation if the drain-to-source voltage exceeds a preset trip level.
High-side over-current sensing monitors drain-to-source voltage of the high-side MOSFET while it
is in the on state through the CSH and VS pins. The CSH pin detects the drain voltage with
reference to the VS pin, which is the source of the high-side MOSFET. In contrast to the low-side
current sensing, the threshold of CSH pin to trigger OC protection is internally fixed at 1.2V. An
external resistive divider R19, R18 and R17 are used to program a threshold as shown in Fig 26.
An external reverse blocking diode D4 is required to block high voltage feeding into the CSH pin
during low-side conduction. By subtracting a forward voltage drop of 0.6V at D4, the minimum
threshold which can be set for the high-side is 0.6V across the drain-to-source.
Table 2 Actual OCP table setting thresholds
Function
OCSET
Device
R12A
R12B
Tested OCP current 25oC
CSH
R18A
R18B
Tested OCP current 25oC
Peak load current
at rated power
Amp7-55
Amp7-100
Amp7-150
Amp7-200
1.3K
3.9K
7.5K
5.1K
23A
30A
23A
4.7K
9.1K
8.2K
23A
29A
23A
8.7A
12.2A
8.9A
0.0
6.0A
Over-Voltage Protection (OVP)
OVP is provided externally to the IRS2092. OVP shuts down the amplifier if the bus voltage
between GND and +B exceeds 75V. The threshold is determined by a Zener diode Z100. OVP
www.irf.com
IRAUDAMP7S REV 1.3
Page 24 of 42
protects the board from harmful excessive supply voltages, such as due to bus pumping at very
low frequency continuous output in stereo mode.
Under-Voltage Protection (UVP)
UVP is provided externally to the IRS2092. UVP prevents unwanted audible noise output from
unstable PWM operation during power up and down. UVP shuts down the amplifier if the bus
voltage between GND and +B falls below a voltage set by Zener diode Z101.
Speaker DC-Voltage Protection (DCP)
DCP protects speakers against DC output current feeding to its voice coil. DC offset detection
detects abnormal DC offset and shuts down PWM. If this abnormal condition is caused by a
MOSFET failure because one of the high-side or low-side MOSFETs short circuited and remained
in the on state, the power supply needs to be cut off in order to protect the speakers. Output DC
offset greater than ±4V triggers DCP.
Offset Null (DC Offset) Adjustment
The IRAUDAMP7S requires no output-offset adjustment. DC offsets are tested to be less than ±20
mV.
Over-Temperature Protection (OTP)
A NTC resistor, TH100 in Fig 25, is placed in close proximity to two dual MOSFETs on a heatsink
to monitor heatsink temperature. If the heatsink temperature rises above 100 °C, the OTP shuts
down both channels by pulling down CSD pins of the IRS2092. OTP recovers once the
temperature has cooled down.
ON-OFF Switch
OFF position of S1 forces the IRAUDAMP7S to stay in shutdown mode by pulling down the CSD
pin. During the shutdown mode the output MOSFETs are kept off.
Click and POP Noise Reduction
Thanks to the click and pop elimination function built into the IRS2092, IRAUDAMP7S does not
use any additional components for this function.
www.irf.com
IRAUDAMP7S REV 1.3
Page 25 of 42
Power Supply Requirements
For convenience, the IRAUDAMP7S has all the necessary housekeeping power supplies onboard
and only requires a pair of symmetric power supplies. Power supply voltage depends on the model
and is shown in the power selection in Table 1.
House Keeping Power Supply
The internally-generated housekeeping power supplies include ±5.6V for analog signal processing,
and +12V supply (VCC) referred to negative supply rail -B for MOSFET gate drive. The VAA and
VSS supplying floating input section are fed from +B and -B power stage bus supplies via R117
and R118, respectively. Gate driver section of IRS2092 uses VCC to drive gates of MOSFETs.
The VCC is referenced to –B (negative power supply). D3 and CP6 form a bootstrap floating supply
for the HO gate driver.
Bus Pumping
When the IRAUDAMP7S is running in the stereo mode, bus pumping effect takes place with low
frequency high output. Since the energy flowing in the Class D switching stage is bi-directional,
there is a period where the Class D amplifier feeds energy back to the power supply. The majority
of the energy flowing back to the supply is from the energy stored in the inductor in the output LPF.
Usually, the power supply has no way to absorb the energy coming back from the load.
Consequently the bus voltage is pumped up, creating bus voltage fluctuations.
Following conditions make bus pumping worse:
1. Lower output frequencies (bus-pumping duration is longer per half cycle)
2. Higher power output voltage and/or lower load impedance (more energy transfers between
supplies)
3. Smaller bus capacitance (the same energy will cause a larger voltage increase)
The OVP protects IRAUDAMP7S from failure in case of excessive bus pumping. One of the
easiest counter measures of bus pumping is to drive both of the channels in a stereo configuration
out-of-phase so that one channel consumes the energy flow from the other and does not return it
to the power supply. Bus voltage detection monitors only +B supply, assuming the bus pumping
on the supplies is symmetric in +B and -B supplies.
There is no bus pumping effect in full bridge mode.
www.irf.com
IRAUDAMP7S REV 1.3
Page 26 of 42
Cyan: Positive Rail voltage (+B), Green: Speaker Output, Pink: Negative Rail voltage (-B)
Fig 29 Bus Pumping in Half Bridge Mode
Bridged Configuration
By selecting S300 to Bridged position, the IRAUDAMP7S realizes full bridge mode, also known as
bridge-tied-load, or BTL configuration. Full bridge operation is achieved by feeding out-of-phase
audio input signals to the two input channels as shown in the Fig 30 below.
In bridged mode, IRAUDAMP7S receives audio input signal from channel A only. The on-board
inverter feed out-of-phase signal to Channel B. The speaker output must be connected between
(+) of Channel A and (+) of Channel B in bridged mode.
In bridged mode, nominal load impedance is 8 Ω. (See power table in Table 1)
.
C300
From Ch A
RCA1
JW8
R300
22k
Bridged
R302
+VAA
0.1uF
1
100
7
R301
22k
8
CP1B+ S300
1
U300
TL072CP
2
From Ch B
RCA2
3
2
4
6
5
3
6
SW DPDT
4
5
C301
Steereo
R303
-VSS
0.1uF
100
Fig 30 Bridged Configuration (BTL)
www.irf.com
IRAUDAMP7S REV 1.3
Page 27 of 42
Load Impedance
Each channel is optimized for a 4 Ω speaker load in half bridge and 8 Ω load in full bridge.
Output Filter Selection
Since the output filter is not included in the control loop of the IRAUDAMP7S, the control loop has
no ability to compensate performance deterioration caused by the output filter. Therefore, it is
necessary to understand what characteristics are preferable when designing the output filter.
1) The DC resistance of the inductor should be minimized to 20 mΩ or less.
2) The linearity of the output inductor and capacitor should be high with output current and
voltage.
Fig 31 demonstrates THD performance difference with various inductors.
100
T
T
10
1
%
0.1
0.01
0.001
0.0001
100m
200m
500m
1
2
5
10
20
50
100
200
W
Fig 31 THD+N vs. Output Power with Different kind of Output Inductors
www.irf.com
IRAUDAMP7S REV 1.3
Page 28 of 42
Input Signal and Gain Setting
A proper input signal is an analog signal ranging from 20Hz to 20kHz with up to 3 VRMS amplitude
with a source impedance of no more than 600 Ω. Input signal with frequencies from 30kHz to
60kHz may cause LC resonance in the output LPF, causing a large reactive current flowing
through the switching stage, especially with greater than 8 Ω load impedances, and the LC
resonance can activate OCP.
The IRAUDAMP7S has an RC network called Zobel network (R30 and C13) to damp the
resonance and prevent peaking frequency response with light loading impedance. (Fig 32) The
Zobel network is not thermally rated to handle continuous supersonic frequencies above 20kHz.
These supersonic input frequencies can be filtered out by adding R2 and C2 as shown on main
schematic Fig 33 and Fig 34. This RC filter works also as an input RF filter to prevent potential
radio frequency interferences.
.
0V
LP Filter
0V
L1
C12
.
R30
.
C13
.
Fig 32 Output Low Pass Filter and Zobel Network
Gain Setting
The ratio of resistors R8/R2 in Fig 33 sets voltage gain. The IRAUDAMP7S has no on board volume control.
To change the voltage gain, change the input resistor term R2. Changing R8 affects PWM control loop
design and may result poor audio performance.
www.irf.com
IRAUDAMP7S REV 1.3
Page 29 of 42
VS1
Feedback
22uF
3
1nF
1nF
20R
C7
BS250F
4
5
-VSS
CP3
R118
*3.3k 1W
VS
3
CSD
VCC
VSS
LO
12
D3
R20
10uF
6
Z104
5.6V
COMP
13
+B
CP2
22uF
4.7R
11
R25
2
20R
R13
7
VREF
COM
10
10k
8
DT
9
IRS2092S
R26
R21
R23
LED1
10R
10k
Blue
2 R114
10k
R27
10k
VCC
CP5
22uF
3
C12
0.47uF, 400V
-B
*1k 1W
TIP31C
Q105
Z102
R115
1
R12
*7.5k
OCSET
Note: Components values marked on red or * are according to power table
IRAUDAMP7-55, +B,-B are +/-25V with FET1 as IRFI4024H-117P
IRAUDAMP7-100, +B,-B are +/-35Vwith FET1 as IRFI4212H-117P
IRAUDAMP7-150, +B,-B are +/-50Vwith FET1 as IRFI4019H-117P
IRAUDAMP7-200, +B,-B are +/-70Vwith FET1 as IRFI4020H-117P
*15k
15V
-B
CP101
22uF
Fig 33 Amplifier Schematic, Channel 1 & Channel 2
.
www.irf.com
IRAUDAMP7S REV 1.3
Page 30 of 42
CH1 OUT
CH_OUT
*MUR120RLG
D5
CP7
2
R3
1nF
CP8
*470uF,100V
L1
22uH
C6
C4
SD
100R
HO
HS1
4
0.1uF,100V
1
IN-
R24
14
0.1uF,100V
C14
3 FET2
C9
15
C10
*470uF,100V
2
100R
CSD1
D1
VB
10k
CP6
R11
R14
4.7k
RED
PROT
GND
FET1
*IRFI4019H-117P
C11
0.1uF,400V
2K POT
P1
CSH
D4
10R
22uF
VAA
16
150pF,250V
1
Z103
5.6V
*9.1k
R19
+VAA
CP4
+B
10R
100k
CH1
R29
U1
*47k
R18
10k
R28
R1
R22
*3.01K 1%
C2
1nF
5
330
22uF
*3.3k 1w
R17
R7
C8
R2
1
RCA1 RCA1 CP1
+B
R117
R8
*120k 1%
150pF,250V
Note:
R2 & C2 are RF filters, optional
IRAUDAMP7S Rev 1.0
R30
10, 1W
D6
-B
*MUR120RLG
C13
0.1uF, 400V
SPKR1
1
2
R31
2.2k
+
CH1
-
JW2
SD
JW3
TH1 is thermally connected with FET1
DCP
SD
-B
VCC
+B
-B
JW8
JW9
JW10
JW11
VCC
-B
VCC
R104
4.7k
+B
TH100
TH2.2k
MMBT5401
VCC
R103
715R
Q102
MMBT5401
OTP
JW5
JW7
R108
CH2_OUT
JW4
100k
R109
JW12
100k
R110
R101
100k
CP100
4.7k
Q103
MMBT5401
330uF,10V
Q101
-VSS
-B
S1
2
+B
+B
1
3
-VSS
Z100
*68V
4
Z101
*39V
R111
10k
R105
10k
R106
10k
R107
10k
UVP
Q100
MMBT5551
SD
6
SW DPDT
R112
47k
Q104
MMBT5551
R102
10k
OVP
5
C100
0.1uF
R113
10k
-VSS
-VSS
Note: Components values marked on red or * are according to power table
Fig 34 Protection Schematic
.
www.irf.com
IRAUDAMP7S REV 1.3
Page 31 of 42
CH1_OUT
Bridged
S300
CP1B+
2
1
FromCh B
RCA2
3
4
5
JW1
C300
FromCh A
R300
RCA1
22k
0.1uF
1
6
SW DPDT
JW6
100
7
R301
22k
R302
8
U300
TLC081IDR
2
6
3
4
5
C301
R303
-VSS
0.1uF
100
Fig 35 Bridge Preamp Schematic
www.irf.com
IRAUDAMP7S REV 1.3
Page 32 of 42
Steereo
+VAA
IRAUDAMP7S-150 Fabrication Materials
Table 3 IRAUDAMP7S-150 Electrical Bill of Materials
Quantity
Value
8
1nF,250V
4
150pF,250V
4
0.1uF,400V
4
0.1uF,100V
2
0.47uF, 400V
3
0.1uF, 10V
1
ED365/3
12
22uF
2
10uF, 16V
4
470uF,100V
1
330uF, 10V
2
Red LED
Description
Designator
CAP CER 1000PF 250V C0G
5%
CAP CER 150PF 250V U2J
C2A, C2B, C4A, C4B,
C6A, C6B, C7A, C7B
C8A, C8B, C9A, C9B
CAP .10UF 400V METAL
POLYPRO
CAP .10UF 100V CERAMIC
X7R
CAP .47UF 400V METAL
POLYPRO
CAP CER 0.1UF 10V SL 5%
C10A, C10B,
C13B
C11A, C11B,
C14B
C12A, C12B
TERMINAL BLOCK 7.50MM
3POS PCB
CAP 22UF 25V ELECT VR
RADIAL
Digikey P/N
Vendor
445-2325-1-ND
TDK Corporation
490-5025-1-ND
Murata Electronics
C13A,
495-1311-ND
EPCOS Inc
C14A,
PCC2239CT-ND
Panasonic - ECG
495-1315-ND
EPCOS Inc
C100, C300, C301
445-2686-1-ND
TDK Corporation
CONN1
ED2355-ND
CP1A, CP1B, CP2A,
CP2B, CP4A, CP4B,
CP5A, CP5B, CP6A,
CP6B,
CP101A,
CP101B
CP3A, CP3B
493-1058-ND
On
Shore
Technology Inc
Nichicon
P966-ND
Panasonic - ECG
493-1985-ND
Nichicon
P5125-ND
Panasonic - ECG
CSD1A, CSD1B
160-1140-ND
Lite-On Inc
2
1N4148WS
CAP ELECT 10UF 16V KS
RADIAL
CAP 470UF 100V ELECT PW
RADIAL
CAP 330UF 10V ALUM LYTIC
RADIAL
LED 3MM HI-EFF RED
TRANSPARENT
DIODE SWITCH 75V 200MW
D1A, D1B
1N4148WS-FDICT-ND
Diodes Inc
2
MURA120T3G
DIODE ULTRA FAST 1A 200V
D3A, D3B
ON Semiconductor
2
BAV19WS
DIODE SWITCH 100V 200MW
D4A, D4B
MURA120T3GOSCTND
BAV19WS-FDICT-ND
4
MURA120T3G
DIODE ULTRA FAST 1A 200V
D5A, D5B, D6A, D6B
ON Semiconductor
2
IRFI4019H117P
FET1A, FET1B
2
BS250P
IRFI4019H-117P,
Dual
MOSFET
TO-220-5
MOSFET P-CH 45V 90MA
MURA120T3GOSCTND
IR's Part No.
FET2A, FET2B
BS250FTC-ND
1
Heat Sink
Aluminum heat spreader
1
JW-300
3
JW-300
1
JW-1500
1
JW-1500
2
JW-1800
2
JW-2000
2
22uH, 13A
Wire Jumper
insulated
Wire Jumper
insulated
Wire Jumper
insulated
Wire Jumper
insulated
Wire Jumper
insulated
Wire Jumper
insulated
Class D Inductor,
2
Blue LED
2
2K POT
LED 3MM DUAL
BLUE CLEAR
POTENTIOMETER
2
MMBT5551
TRANSISTOR NPN 160V
www.irf.com
CP7A,
CP8B
CP100
CP7B,
CP8A,
Diodes Inc
International
Rectifier
Zetex Inc
HS1A
Drawing IRHS_Amp1
Custom made
#20
AWG
JW1
Custom
Custom
#20
AWG
JW2, JW4, JW10
Custom
Custom
#20
AWG
JW3
Custom
Custom
#20
AWG
JW5
Custom
Custom
#20
AWG
JW6, JW7
Custom
Custom
#20
AWG
JW8, JW9
Custom
Custom
L1A, L1B
LED1A, LED1B
Sagami 7G17A-220MR
or
IN09063
160-1600-ND
Inductors, Inc.
or
ICE Components,
Inc.
LITE-ON INC
P1A, P1B
3362H-202LF-ND
Bourns Inc.
Q100, Q104
MMBT5551FSCT-ND
Fairchild
Semiconductor
22UH
FLANGE
IRAUDAMP7S REV 1.3
Page 33 of 42
3
MMBT5401
Q101, Q102, Q103
MMBT5401-FDICT-ND
Diodes Inc
TIP31C
TRANS PNP 150V 350MW
SMD
TRANSISTOR NPN 100V 3A
2
Q105A, Q105B
497-2615-5-ND
STMicroelectronics
3
100k
RES 100K OHM 1/8W 5%
R1A, R1B, R110
RHM100KARCT-ND
Rohm
1
330
RES 330 OHM 1/8W 1%
R2A
RHM330CRCT-ND
Rohm
1
330
RES 330 OHM CARBON FILM
R2B
P330BACT-ND
Panasonic - ECG
2
100R
RES 100 OHM 1/8W 5%
R3A, R3B
P100ACT-ND
Panasonic - ECG
2
3.01K
RES 3.01K OHM 1/8W 1%
R7A, R7B
RHM3.01KCCT-ND
Rohm
2
120k 1%
R8A, R8B
P120KCACT-ND
Panasonic - ECG
2
100R
RES METAL FILM 120K OHM
1/4W
RES 100 OHM 1/8W 5%
R11A, R11B
RHM100ARCT-ND
Rohm
2
7.5k
RES 7.5K OHM 1/8W 5%
R12A, R12B
RHM7.5KARCT-ND
Rohm
18
10k
RES 10K OHM 1/8W 5%
RHM10KARCT-ND
Rohm
4
4.7k
RES 4.7K OHM 1/8W 5%
RHM4.7KARCT-ND
Rohm
2
47k
RES 47K OHM 1/8W 5%
R13A, R13B, R19A,
R19B, R22A, R22B,
R23A, R23B, R26A,
R26B, R27A, R27B,
R102,
R105,
R106,
R107, R111, R113
R14A, R14B, R101,
R104
R17A, R17B
RHM47KARCT-ND
Rohm
2
9.1k
RES 9.1K OHM 1/8W 5%
R18A, R18B
RHM9.1KARCT-ND
Rohm
2
4.7R
RES 4.7 OHM 1/4W 1%
R20A, R20B
P4.7RCT-ND
Panasonic - ECG
2
10R
RES 10.0 OHM 1/4W 1%
R21A, R21B
RHM10.0FRCT-ND
Rohm
4
20R
RES 20.0 OHM 1/8W 1%
R25A,
RHM20.0CRCT-ND
Rohm
4
10R
RES 10.0 OHM 1/8W 1%
R29A,
RHM10.0CRCT-ND
Rohm
2
10, 1W
RES 10 OHM 1W 5%
R24A, R24B,
R25B
R28A, R28B,
R29B
R30A, R30B
2
2.2k
RES 2.2K OHM 1/4W 5%
R31A, R31B
1
715R
RES 715 OHM 1/8W 1%
R103
RHM715CCT-ND
Rohm
1
100k
RES 100K OHM 1/8W 5%
R108
RHM100KARCT-ND
Rohm
1
100k
R109
P100KBATB-ND
Panasonic - ECG
1
47k
RES 100K OHM CARBON
FILM 1/4W 5%
RES 47K OHM 1/8W 5%
R112
RHM47KARCT-ND
Rohm
2
1k 1W
R114A, R114B
1.0KW-1-ND
Yageo
2
15k
4
3.3k 1w
2
2
PT10XCT-ND
Panasonic - ECG
RHM2.2KERCT-ND
Rohm
R115A, R115B
P15KBACT-ND
Panasonic - ECG
R117A, R117B, R118A,
R118B
R300, R301
3.3KW-1-ND
Yageo
22k
RES 1.0K OHM 1W 5%
METAL OXIDE
RES 15K OHM CARBON FILM
1/4W 5%
RES 3.3K OHM 1W 5%
METAL OXIDE
RES 22K OHM 1/8W 5%
RHM22KARCT-ND
Rohm
100
RES 100 OHM 1/8W 5%
R302, R303
RHM100ARCT-ND
Rohm
2
RCJ-012
RCA1A
CP-1401-ND (Red)
CUI Inc
2
RCJ-013
RCA1B
CP-1402-ND (White)
CUI Inc
2
EG2209A
S1, S300
EG1908-ND
E-Switch
2
ED365/2
SPKR1A, SPKR1B
ED2354-ND
1
2.2k at 25C
TH100
BC2304-ND
On
Shore
Technology
Vishay/BC
Components
2
IRS2092SPBF
U1A, U1B
IR's P/N
1
TLC071CD
U300
2
15V
CONN RCA JACK METAL R/A
RED PCB
CONN RCA JACK METAL R/A
WHT PCB
SWITCH SLIDE DPDT 12V
.1A L=4
TERMINAL BLOCK 7.50MM
2POS PCB
THERMISTOR
NTC
2.2K
OHM
LEADED
Class
D
Controller,
IRS2092SPbF 16-Lead SOIC
IC SINGLE SUPPLY OPAMP
8-SOIC
DIODE ZENER 500MW 15V
296-2414-5-ND
IRS2092SPBF
MMSZ4702T1GOSCTND
www.irf.com
Z102A, Z102B
IRAUDAMP7S REV 1.3
Page 34 of 42
International
Rectifier
Texas Instruments
ON Semiconductor
1
68V
DIODE ZENER 375MW 68V
Z100
1
39V
DIODE ZENER 500MW 39V
Z101
4
5.6V
www.irf.com
568-3782-1-ND
BZT52C39-TPMSCTND
DIODE ZENER 500MW 5.6V
Z103A, Z103B, Z104A, BZT52C5V6Z104B
TPMSCT-ND
Note all ½ W and 1W resistors are flame proof part numbers
IRAUDAMP7S REV 1.3
Page 35 of 42
NXP
Semiconductors
Micro Commercial
Co
Micro Commercial
Co
Table 4 IRAUDAMP7S Mechanical Bill of Materials
Quantit
y
Value
Description
Designator
Digikey
P/N
Vendor
H729ND
Building
Fastener
s
5
Washer #4 SS
WASHER LOCK
INTERNAL #4 SS
Lock washer 1, Lock washer 2,
Lock washer 3, Lock washer 4,
Lock washer 5
1
PCB
Print Circuit Board
IRAUDAMP7S_Rev
2.2 .PCB
PCB 1
12
Screw 440X5/16
SCREW MACHINE
PHILLIPS 4-40X5/16
Screw 1, Screw 2, Screw 3,
Screw 4, Screw 5, Screw 6,
Screw 7, Screw 8, Screw 9,
Screw 10, Screw 11, Screw 12
H343ND
4
Stand off 0.5"
STANDOFF HEX 440THR .500"L ALUM
Stand Off 1, Stand Off 2, Stand
Off 3, Stand Off 4
1893KND
1
Stand off 0.5"
STANDOFF HEX M/F 440 .500" ALUM, Chassis
GND
Stand Off 5
8401KND
1
AAVID 4880G
Thermalloy TO-220
mounting kit with screw
TO-220 mounting kit 1
Newuark
82K609
6
www.irf.com
IRAUDAMP7S REV 1.3
Custom
Building
Fastener
s
Keystone
Electronics
Keystone
Electronics
Thermalloy
Page 36 of 42
Table 5 IRAUDAMP7S Models Differential Table
Model Name
Item
IR
Power
MOSFE
TS
Half
Bridge
Output
Full
Bridge
Output
Power
Supply
Audio
Gain
Feedbac
k
+VAA
-VSS
VCC
OCSET
CSH
VB
AMP7S-55
AMP7S-100
AMP7S-150
AMP7S-200
FET1
IRFI4024H-117P
IRFI4212H-117P
IRFI4019H-117P
IRFI4020H-117P
8Ω
25 W x 2
60 W x 2
125 W x 2
250 W x 2
Stereo
4Ω
50 W x 2
120 W x 2
250 W x 2
N/A
Stereo
8Ω
100 W x 1
240 W x 1
500 W x 1
N/A
Bridged
+B, -B
±B
Voltage
Range
±25 V
±35 V
±50 V
±70 V
±3 V
±5 V
±8 V
±10 V
Gain
20
30
36
40
68k
100k
120k
130 k
1 k, 1 W
2.2 k, 1 W
3.3 k, 1 W
5.1 k, 1 W
1 k, 1 W
2.2 k, 1 W
3.3 k, 1 W
5.1 k, 1 W
100,1 W
220, 1 W
1 k, 1 W
2.2 k 1 W
R8A,R8
B
R117A*
R117B*
R118A*
R118B*
R114A*
R114B*
R115A
R115B
R12A
R12B
R18A
R18B
R17A
R17B
OVP
Z100
UVP
Z101
Clampin
g Diode
D5A
D5B
D6A
D6B
4.7 k
10 k
15 k
20 k
1.3 k
(20 A)
0.0
(20A)
3.9 k
(23 A)
4.7 k
(23A)
7.5 k
(30 A)
9.1 k
(29A)
5.1 k
(23 A)
8.2 k
(23 A)
47 k
20 k
33 k
24 V
BZT52C24TPMSCT-ND
12 V
MMSZ5242BT1GO
SCT-ND
47 V
MMSZ5261BT1GO
SCT-ND
30 V
MMSZ5256BT1GO
SCT-ND
MURA120T3OSCTND
MURA120T3OSCTND
68 V
568-3782-1-ND
39 V
BZT52C39TPMSCT-ND
IMURA120T3OS
CT-ND
Notes
(Trip
level)
(Trip
level)
75 k
91 V
MMSZ5270BT1G
OSCT-ND
51 V
MMSZ5262BT1G
OSCT-ND
Zener
Digikey
P/N
Zener
Digikey
P/N
N/A
* Marked components are axial, ±5 %, ¼ w, and flame proof type.
www.irf.com
IRAUDAMP7S REV 1.3
Page 37 of 42
IRAUDAMP7S Hardware
Put silicone grease between
the heat spreader and TO-220-5
Heat sink
Heatsink threaded
Screw
Lock washer
Flat Washer #4
Dual FET
TO-220-5
Heatsink threaded
PCB
Lock washer
Screws
H343-ND
Screw
Lock washers
H729-ND
Fig 36 Dual MOSFET Mounting
TO-220 Pad insulator
Heat Sink
Shoulder Washer
Heatsink threaded
Screw
Lock washer
Flat Washer #4
TO-220
Heatsink threaded
PCB
Lock washer
Lock washers
H729-ND
Screw
Screws
H343-ND
Fig 37 +VCC Regulator TO-220 Mounting
www.irf.com
IRAUDAMP7S REV 1.3
Page 38 of 42
Fig 38 Heat Spreader
.
Screw
H343-ND
Screw
H343-ND
Lock washer
Screw
H343-ND
Lock washer
Lock washer
incert thermistor
into this hole and
put silicone grease
Screw
H343-ND
Stand Off 3
1893K-ND
Lock washer
Stand Off 2
1893K-ND
Lock washer
Lock washer
Screw
Stand Off 4
1893K-ND
Lock washers
H729-ND
GND Standoff
Screw
Stand Off 5
8401K-ND
Stand Off 1
1893K-ND
Screws
H343-ND
Fig 39 Hardware Assemblies
www.irf.com
IRAUDAMP7S REV 1.3
Page 39 of 42
IRAUDAMP7S PCB Specifications
PCB:
1.
2.
3.
4.
5.
6.
Single Layers SMT PCB with through holes
1/16 thickness
2/0 OZ Cu
FR4 material
10 mil lines and spaces
Solder Mask to be Green enamel EMP110 DBG (CARAPACE) or Enthone
Endplate DSR-3241or equivalent.
7. Top Silk Screen to be white epoxy non conductive per IPC–RB 276 Standard.
8. All exposed copper must finished with TIN-LEAD Sn 60 or 63 for 100u inches
thick.
9. Tolerance of PCB size shall be 0.010 –0.000 inches
10. Tolerance of all Holes is -.000 + 0.003”
11. PCB acceptance criteria as defined for class II PCB’S standards.
Gerber Files Apertures Description:
All Gerber files stored in the attached CD-ROM were generated from Protel Altium
Designer Altium Designer 6. Each file name extension means the following:
1. .gbl
2. .gto
3. .gbo
4. .gbs
5. .gko
6. .gm1
7. .gd1
8. .gg1
9. .txt
10. .apr
Bottom copper, bottom side
Top silk screen
Bottom silk screen
Bottom Solder Mask
Keep Out,
Mechanical
Drill Drawing
Drill locations
CNC data
Apertures data
Additional files for assembly that may not be related with Gerber files:
11. .pcb
12. .bom
13. .cpl
14. .sch
15. .csv
16. .net
17. .bak
18. .lib
www.irf.com
PCB file
Bill of materials
Components locations
Schematic
Pick and Place Components
Net List
Back up files
PCB libraries
IRAUDAMP7S REV 1.3
Page 40 of 42
Fig 40 IRAUDAMP7S PCB Top Overlay (Top View)
Fig 41 IRAUDAMP7S PCB Bottom Layer (Top View)
www.irf.com
IRAUDAMP7S REV 1.3
Page 41 of 42
Revision changes descriptions
Revision
Rev 1.1
Rev 1.2
Rev 1.3
Changes description
Released
ROHS Compliant(BOM updated)
BOM updated :Ice Components as a
second vender of the inductor
Date
Sep, 03 2008
May, 29 2009
October 28, 2009
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105
Data and specifications subject to change without notice. 08/29/2008
www.irf.com
IRAUDAMP7S REV 1.3
Page 42 of 42