TDA7294 Introduction
The TDA7294 is a monolithic integrated circuit in the Multiwatt15 package, intended for use as an audio class AB amplifier in Hi-Fi field applications (Home Stereo, self-powered loudspeakers, Topclass TV). Thanks to the wide voltage range and to the high out current capability it is able to supply the highest power into both 4Ω and 8Ω loads even in presence of poor supply regulation. With high Supply Voltage Rejection. The built-in muting function with turn-on delay simplifies the remote operation avoiding switching on-off noises.
This is a build and evaluation of the TDA7294 100 watt audio amplifier I.C.
Catalog
TDA7294 Features
- Very high operating voltage range (±40V)
- DMOS power stage
- High output power(up to 100w music power)
- Muting/stand-by functions
- No switch on/off noise
- No Boucheron cells
- Very low distortion
- Very low noise
- Short circuit protection
- Thermal shutdown
TDA7294 Pin Configuration and Functions
Pin functions:
Pin No.
|
Pin Name
|
Pin Description
|
1
|
Stand-By GND
|
Stand-By GND, output gets connected to ground
|
2
|
Inverting input
|
The Inverting input
|
3
|
Non-Inverting input
|
The Non-Inverting input
|
4
|
SVR
|
Supply Voltage Rejection used for power supply ripple or noise rejection
|
5
|
N.C.
|
Not connected
|
6
|
Bootstrap
|
Used to step-up charge
|
7
|
+Vs Supply
|
Positive supply
|
8
|
-Vs Supply
|
Negative supply
|
9
|
Stand-by
|
Standby control pin used for low power mode, output runs in low current mode
|
10
|
Mute
|
Audio is disabled of the output
|
11
|
N.C.
|
Not connected
|
12
|
N.C.
|
Not connected
|
13
|
+Vs Power
|
Positive power supply
|
14
|
Out
|
Output pin
|
15
|
-Vs Power
|
Negative power supply
|
TDA7294 Block Diagram
TDA7294 Package Outline
- Multiwatt15 V package information
Mechanical Data:
- Multiwatt15 H package information
Mechanical Data:
TDA7294 Alternatives
TDA7293, TDA7295, LM3886
Where and How to Use TDA7294
TDA7294 can be used in circuits requiring high power and high-efficiency amplification applications.
R1 is the input resistance and its recommended value is 22k Ω. R2=680 Ω and R3= 22k Ω decides the loop gain of the amplifier. The R4=22k Ω and C4=10µF determine the stand by ON/OFF time duration. The R5=10k Ω and C3=10µF are used for deciding the mute time constant. Decoupling used is C1=0.47µF. C2=22mF is the feedback DC. C5=22mF Bootstrapping. C6, C8=1000mF and C7, C9 0.1mF are used for supply voltage bypass.
TDA7294 Electrical Specifications
- Maximum VS Supply Voltage (No Signal) ±50 V
- Maximum IO Output Peak Current 10 A
- Maximum Top Operating Ambient Temperature Range 0 to 70 °C
- Maximum Tstg, Tj Storage and Junction Temperature 150 °C
- VS Supply Range is minimum ±10 V and maximum value ±40 V
- Open-Loop Voltage Gain 80 dB
- Closed-Loop Voltage Gain minimum 24 dB, typically 30 dB and maximum 40 dB
- Ib Input Bias Current 500 nA
TDA7294 Applications
- HI-FI
- CAR-RADIO
- Bridge Application Circuit
- An audio class AB amplifier
- Stereos system
- Subwoofer
Differences Between TDA7294 and TDA7293
Features of TDA7293
- Multipower BCD technology
- Very high operating voltage range (±50 V)
- DMOS power stage
- High output power (100 W into 8 Ω @ THD =10%, with VS = ±40 V)
- Muting and stand-by functions
- No switch on/off noise
- Very low distortion
- Very low noise
- Short-circuit protected (with no input signal applied)
- Thermal shutdown
- Clip detector
- Modularity (several devices can easily be connected in parallel to drive very low impedances)
Both these audio chips use DMOS or double-diffused metal–oxide–semiconductor output stages. Supply rails are +/- 60V DC max for the TDA7293 and +/-50V DC for the TDA7294, transformer supply rails AC 32V- 0-32V to 35V-0-35V, recommendation is 32V-0-32V for 8 ohm operation.
The conversion rate value of TDA7293 is also 10V/us, but it has a wider voltage supply range, and the highest available dual 50V DC power supply, which means that it has a larger dynamic range and higher output power than TDA7294, In dual 40V DC power supply, an average output power of 100W can be achieved at 8-ohm load. Of course, if the voltage is increased to double 50V, or a smaller load such as 4 ohms, there will be greater output power, according to the characteristics of TDA7293. When selecting a transformer, a dual 28V AC voltage can be selected, so the voltage after rectification and filtering is about 40V, of course, the voltage can also be increased. Considering that there is a fluctuation in the grid voltage, it is best to be less than the maximum voltage of 50V, so that the circuit can work in a more stable condition.
Product Manufacturer
STMicroelectronics (ST) group was established in June 1988 as a result of the merger of SGS Microelectronics of Italy and Thomson Of France. In May 1998 SGS-Thomson Microelectronics changed its name to STMicroelectronics Limited.
It is the world's largest manufacturer of dedicated analog chips and power conversion chips, the world's largest supplier of industrial semiconductors and set-top box chips, and a world leader in discrete components, mobile phone camera modules, and automotive integrated circuits.
Component Datasheet
FAQ
What is the TDA7294?
A monolithic integrated circuit in Multiwatt15 package.
Where to Use TDA7294?
TDA7294 can be used in circuits requiring high power and high-efficiency amplification applications.
What is the conversion rate value of TDA7293?
10V/us