Class D Audio Amplifier
Board - TDA7492
User’s Guide
© 2004-2011 Sure Electronics Inc. AA-AB32189 & AA-AB32174 & AA-AB34165_Ver1.0
CLASS D AUDIO AMPLIFIER
BOARD - TDA7492
USER’S GUIDE
Table of Contents
Chapter 1. Overview ..........................................................................................................1
1.1 Overview.............................................................................................................. 1
1.2 Features............................................................................................................... 2
1.3 Applications......................................................................................................... 2
1.4 Benefits................................................................................................................ 2
1.5 Quick Start........................................................................................................... 3
Chapter 2. Hardware Detail...............................................................................................5
2.1 Power Connection............................................................................................... 5
2.2 Input Connections............................................................................................... 5
2.3 Output Connections............................................................................................ 6
2.4 LED Indicators..................................................................................................... 7
2.5 Volume Control.................................................................................................... 7
2.6 Notes.................................................................................................................... 8
Chapter 3. Electrical Characteristics ...............................................................................9
Chapter 4. Mechanical Drawing......................................................................................11
Chapter 5. Contact Us .....................................................................................................12
© 2004-2011 Sure Electronics Inc.
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NOTES:
Product Version ： Ver 1.0
Document Version ： Ver 1.0
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© 2004-2011 Sure Electronics Inc
1.1 Overview
CLASS D AUDIO AMPLIFIER
BOARD - TDA7492
USER’S GUIDE
Chapter 1. Overview
Welcome to use this 2*100W，2*50W，2*25W Class-D audio amplifier board series by Sure
Electronics.
TABLE 1-1 PRODUCT LIST
Product No. Rating Output Power Per Channel
AA-AB32189 100W @6 Ohm
AA-AB32174 50W @6 Ohm
AA-AB34165 25W @6 Ohm
They integrate ST’s high performance TDA7492 supporting dual channel audio
amplification. Both of channels are capable of outputting nominal power simultaneously
and continuously.
They integrate an external extensible interface to connect the matching product of a
volume control board and a rotary encoder board for volume control. It’s suitable for
amplifier enthusiasts or hobbyists to finish a complete amplifier system.
Resistance and capacity components of high quality, including X7R ceramic capacitors
and lower ESR electrolytic capacitors, are used to gain the perfect timber, finally realize
high S/N ratio, low THD+N, wide frequency response range etc.
Briefly, the power supply range and heat sink performance of each product distinguishes.
You may make the proper choice to meet your application needs.
FIGURE 1-1 FRONT VIEW
© 2004-2011 Sure Electronics Inc.
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FIGURE 1-2 ACCESSORIES PACKAGE (OPTIONAL)
Note: The diagrams above are used for reference only.
1.2 Features
y A perfect "Class D" architecture
y Frequency response: 20Hz to 20KHz(±3dB)
y Four selectable, fixed gain settings of nominally 25.6 dB, 31.6 dB, 35.1 dB and 37.6
y Single end audio signal input
y Over/under voltage protection
y Over current protection
y Over temperature protection
1.3 Applications
It is the ideal solution for any sound reinforcement installation or application needing an
affordable compact PA system.
y Background Music Systems
y Vending machines
y Lifts
y Interactive kiosks
y Home DIY
y Car audio
1.4 Benefits
y Mounting holes facilitate installation and fixing
y Several wiring methods facilitate connection：RCA Socket (Default),Terminal
y Excellent design of the power ports which allows you to connect multiple amplifier
y Excellent heat dissipation eliminates the requirement of an extra heat sink.
dB.
Block(Optional)
boards in series (Terminal Block Optional).
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© 2004-2011 Sure Electronics Inc
1.5 Quick Start
Suggested connection is shown in figure 1-3.
FIGURE 1-3 CONNECTION SCHEMATIC
Overview
Note: Please observe the following steps to complete verification so as to ensure the
products are intact during transit.
1. Open the amplifier package and make sure the product is intact (No missing
or damaged components and no deformation.
2. Please observe the connection schematics when connecting the amplifier
board. Use a nearby sound source, such as MP3 or CD player to have a trial.
This amplifier board can be deemed as qualified if you can hear the sound
corresponding to that sound source
© 2004-2011 Sure Electronics Inc.
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FIGURE 1-4 CASCADING SCHEMATIC (OPTIONAL)
Note: GND should be grounded or connected to the housing of the device.
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© 2004-2011 Sure Electronics Inc
2.1 Power Connection
To power the amplifier board, use either jack J9 or terminal blocks J8 (optional). Pay
attention to the polarity when connecting power supply.
FIGURE 2-1 POWER CONNECTION
CLASS D AUDIO AMPLIFIER
BOARD - TDA7492
USER’S GUIDE
Chapter 2. Hardware Detail
TABLE 2-1 POWER CONNECTION
Connector Mark Description
Jack J9 DC power supply socket
Terminal
Blocks
Note:
1. You are allowed to use only one way to power the amplifier board at a time.
2. The maximum supply voltage shall be referred to Chapter 3.
2.2 Input Connections
You may use RCA connectors to input audio signal.
VCC The positive of power supply socket
J8
GND The negative of power supply socket
© 2004-2011 Sure Electronics Inc.
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FIGURE 2-2 INPUT CONNECTION
TABLE 2-2 INPUT CONNECTION
Connector Mark Channel Description
RCA connector
Terminal Blocks（Optional）
Note: You are allowed to feed only one group (dual channel) of au dio signal to the
amplifier board at a time.
2.3 Output Connections
You can use either terminal blocks or banana connectors (optional) to output audio
signal.
FIGURE 2-3 OUTPUT CONNECTION
J3 Channel 1 Input
J4 Channel 2 Input
J1
J2
Channel 1 Input
GND
GND
Channel 2 Input
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© 2004-2011 Sure Electronics Inc
TABLE 2-3 OUTPUT CONNECTION
Connector Mark Description
Banana Connectors
Terminal blocks*
Note:
2.4 LED Indicators
This amplifier has 1 power LED indicator which is marked as “PWR (D3)”. “Power (D3)”
will be illuminated in green when power-up.
FIGURE 2-4 LED INDICATOR
Hardware Detail
J15 Negative Output of Channel 1
J13 Positive Output of Channel 1
J18 Negative Output of Channel 2
J16 Positive Output of Channel 2
J14 Output of Channel 1
J17 Output of Channel 2
1. Never connect more than one group of speaker to the audio output
2. Never connect CH1_OUT- 、CH2_OUT - together since they belong to dif ferent
NETs.
3. Refer to on-board descriptions for connection details.
2.5 Volume Control
The on-board external extensible interface allows for the connection of a rotary encoder
board and a volume control board for volume control. The two boards are not provided
here but as another product (product No.: AA-AA11117) sold on Sure’s webstore. If you
use the two boards, please set K1 and K2 of the on-board DIP switch SW1 OFF. Not
using these two boards, you may also adjust the volume by setting the DIP switch SW1.
The gain is factory pre-set to low. This can prevent chip from permanent damage caused
by overheat when input signal amplitude is over range. On the other conditions of gain
setting, it is recommended that the output signal amplitude is no larger than the power
© 2004-2011 Sure Electronics Inc.
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Class D Audio Amplifier Board - TDA7492
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supply voltage once the input signal reaches the peak.
Take
AA-AB32189 for example, the maximum amplitude of the input signal is no more
than 320mV RMS when power supply voltage is 36V, load impedance is 6 ohm and the
gain is set at 37.6 dB. The other circumstances can be referred to the input sensitivity
from TABLE 3-1 ELECTRICAL CHARACTERISTICS
FIGURE 2-5 VOLUME CONTROL
2.6 Notes
TABLE 2-8 DIP SWITCH SETTING
Switch K1 K2 Gain Status(dB)
ON ON Weak
SW2
In order to protect amplifier board and extend its service lifetime, please read the
following warnings carefully since warranties will be voided if you do not observe the
following warnings:
Warning 1:
Quality-related issues caused by potentiometers installed by buyers.
Warning 2:
In order to achieve a better sound quality, please use stable power supply since a bad o r
unstable power supply may worsen the sound quality or even cripple the amplifier board.
Warning 3:
Never equip a pre-amplifier to the audio input since the amplifier itself has powerful
amplification ability and a high signal input will burn out the amplifier chip.
Warning 4:
In order to protect amplifier and speaker, please turn the volume output to the minimum
when hooking up the amplifier and you may readjust the volume when you are sure that
the amplifier is functioning properly.
ON OFF Low
OFF ON Medium
OFF OFF High
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© 2004-2011 Sure Electronics Inc
CLASS D AUDIO AMPLIFIER
A
BOARD - TDA7492
USER’S GUIDE
Chapter 3. Electrical Characteristics
Following table lists all typical data of the Amp board. For full specification, please refer to
the data sheet of ST’s TDA7492 chip.
TABLE 3-1 ELECTRICAL CHARACTERISTICS
Parameter Condition Min. Typ. Max.
AA-AB32189 36V 40V
Supply Voltage
Quiescent Current
（Powered by 19V）
Input Sensitivity
（AA-AB32189）
Input Sensitivity
（AA-AB32174）
Input Sensitivity
（AA-AB32165）
Gain(SW1 Setting)
AA-AB32174 24V 27V
AA-AB32165
FAN ON,STBY
Disable
FAN ON,STBY
Enable
FAN OFF,STBY
Disable
FAN OFF,STBY
Enable
25.6dB 1280mV
31.6dB 640mV
35.1dB 430mV
37.6dB
25.6dB 910mV
31.6dB 450mV
35.1dB 300mV
37.6dB
25.6dB 640mV
31.6dB 320mV
35.1dB 210mV
37.6dB
K1 ON, K2 ON 24.6 25.6 26.6
K1 ON, K2 OFF 30.6 31.6 32.6
K1 OFF, K2 ON 34.1 35.1 36.1
K1 OFF, K2 OFF 36.6 37.6 38.6
14V
16V 19V
- 90mA -
- 50mA -
- 40 mA
10 mA
323mV
220mV
160mV
-
-
-
Frequency Range -
Both channels
Efficiency
Input Impedance - 48K ohm 60K ohm Load - - 6 ohm Operating Temperature - 0℃ 20℃ 50℃
© 2004-2011 Sure Electronics Inc.
output rating
power.
A-AB32189 & AA-AB32174 & AA-AB34165_Ver1.0_Page 9
20Hz to 20KHz（±3dB）
-
>90% -
Class D Audio Amplifier Board - TDA7492
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Storage Temperature - -20℃ 20℃ 105℃
Thermal Shutdown - - 150℃ -
Note:
1. Stresses beyond the listed maximum power supply voltage may cause the
permanent damage to components on board.
2. The input sensitivity values are calculated on the basis of 6 Ohm load.
A-AB32189 & AA-AB32174 & AA-AB34165_Ver1.0_Page 10
© 2004-2011 Sure Electronics Inc
CLASS D AUDIO AMPLIFIER
A
BOARD - TDA7492
USER’S GUIDE
Chapter 4. Mechanical Drawing
FIGURE 4-1 MECHANICAL DRAWING
© 2004-2011 Sure Electronics Inc.
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CLASS D AUDIO AMPLIFIER
BOARD - TDA7492
USER’S GUIDE
Chapter 5. Contact Us
Sure Electronics Co., Ltd.
East zone, 3F, Building 6
Jingang Technology Innovation Center
No.108 Ganjiabian Rd (ZIP: 210000)
Qixia District
Nanjing
P.R.China
Tel: +86-25-68154800-860
Fax: +86-25-68154891-832
Website: www.sure-electronics.com
Email: customerservice@sure-electronics.com
AA-AB32189 & AA-AB32174 & AA-AB34165_Ver1.0_Page 12
© 2004-2011 Sure Electronics Inc.
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