Difference Between TDA7293 vs. TDA7294 Audio Amplifier [Video&FAQ]

The TDA7293 Pinout is shown as follows.

TDA7293 Pinout

The TDA7293 is a monolithic integrated circuit in a Multiwatt15  package designed for use as an audio class AB amplifier in  Hi-Fi  applications such as home stereo, self-powered loudspeakers, and Topclass  TV. It can supply the most power into both 4-Ω and 8-Ω loads because of its wide voltage range and strong output current capability.

The remote operation is simplified by the built-in muting function with turn-on delay, which eliminates on-off switching noises.

By connecting numerous devices and using pin11, the parallel mode can be achieved. High output power can be given to loads with very low impedance, reducing the system's heat dissipation.

The TDA7294 Pinout is given below.

TDA7294 Pinout

The TDA7294 is a monolithic integrated circuit that comes in a Multiwatt15 package and is designed to be used as an audio class AB amplifier in Hi-Fi field applications  (Home Stereo, self-powered loudspeakers, Top class TV). It can supply the most power into both 4W and 8W loads due to its wide voltage range and high out current capability, even in the presence of poor supply regulation and high Supply Voltage Rejection. The remote operation is simplified by the built-in muting function with turn-on delay, which eliminates switching on-off noises.

The TDA7294 is a monolithic MOS power amplifier that can operate at 80V supply voltage (100V without a signal) and deliver up to ±10 A of output current. Internally, the TDA7294's metal tab is attached to the -Vs pin.

 TDA7293 Features

• 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)

TDA7294 Features

• Very High Operating Voltage Range of ±40V

• DMOS Power Stage 

• High Output Power (Up To 100W Music Power)

• Muting/Stand-By Functions

• No Switch On/Off Noise 

• No Boucherot Cells

• Very Low Distortion

• Very Low Noise

• Short Circuit Protection 

• Thermal Shutdown

• HI-FI

• CAR-RADIO

• Bridge Application Circuit

• An Audio Class AB Amplifier

• Stereos System

• Subwoofer

TDA7293 and TDA7294 can be utilized in amplification circuits that require a lot of power and efficiency.

The following shows TDA7293 vs TDA7294 Schematic Diagram Monolithic Power Amplifier.

TDA7293 vs TDA7294 Schematic Diagram Monolithic Power Amplifier

TDA7293 As a Circuit

TDA7293 Circuit

Because all additional internal functions are unused, the circuit is conventional and very simple. The All connections can be hardwired or established with plugs and sockets. I predict hard wiring to be the most prevalent method in most circumstances, as connections are difficult to wire and add unneeded cost as well as reduce reliability.

The TDA7293's specifications suggest that it can work with supply voltages of up to ±50V. It might work with no input signal (and hence no output), but if 4 ohm loads are expected, I wouldn't recommend anything higher than ±35V, while ±42V will suffice if you can supply adequate heatsinking.  Naturally, the  42V  supplies (obtained from a 30+30V transformer) are preferable if you can afford to lose a few ICs to experimentation.

The Project 87 balanced transmitter board can also be used to bridge this amp. A ±35V supply should deliver around 150W into 8 ohms. Because the effective impedance of each amplifier is too low, it cannot be bridged into 4 ohms.

The speaker return should be made directly to the centre-tap of the power supply filter capacitors, despite the fact that the  PCB  has a ground pad for the speaker. The pad on the PCB is a 'convenience' that allows PCB connectors to be used (as shown in the photo above). These should only be used if the connection to the power supply is very short (less than 100mm).

TDA7294 As a Circuit

TDA7294 Circuit

R1 is the input resistance, and a value of 22kΩ is ideal. The loop gain of the amplifier is determined by R2=680Ω and R3=22kΩ. The standby ON/OFF time duration is determined by R4=22kΩ and C4=10µF. The silence time constant is determined by the R5=10kΩ and C3=10µF values. C1=0.47µF is the input DC Decoupling utilized. The feedback DC is C2=22mF. Bootstrapping with C5=22mF. For supply voltage bypass,  C6 , C8=1000mF and  C7 , C9 0.1mF are employed.

TDA7293 P.C.B. and Components Layout

TDA7294 P.C.B. and Components Layout

TDA7293 Application Circuit

TDA7294 Application Circuit

TDA7293 High-efficiency Application Circuit

TDA7294 High-efficiency Application Circuit

Equivalent

NTE7165

TDA7294 Alternatives

TDA7293, TDA7295, LM3886

TDA7293 Package

TDA7294 Package

DMOS, or double-diffused metal–oxide–semiconductor, output stages are used in both of these audio chips. The TDA7293 and TDA7294 have maximum supply rails of +/-60V  DC  and +/-50V DC, respectively.  Transformer  supply rails are AC 32V-0-32V to 35V-0-35V, with 32V-0-32V being recommended for 8-ohm operation.

TDA7293 has the same conversion rate as TDA7294, but it has a wider voltage supply range and the highest available dual 50V DC power supply, giving it a larger dynamic range and higher output power. At an 8-ohm load, a twin 40V DC power supply may produce an average output power of 100W. Of course, if the voltage is doubled to 50V, or if the load is reduced to 4 ohms, the output power will increase, according to TDA7293's characteristics. A dual 28V  AC voltage can be selected when choosing a transformer, resulting in a voltage of around 40V after rectification and filtering. Of course, the voltage can be raised. Given the variability in grid voltage, it is preferable to be less than the maximum voltage of 50V, allowing the circuit to operate in a more stable state.

TDA7293 Datasheet

TDA7294 Datasheet