TDA7293 Audio Power Amplifier: Symbol, Features, Applications and TDA7293 vs TDA8954
29 November 2023
Ⅱ. Symbol, footprint and pin configuration of TDA7293
Ⅳ. Technical parameters of TDA7293
Ⅴ. What are the applications of TDA7293?
Ⅵ. What is the difference between TDA7293 and TDA8954?
Ⅶ. Typical application and test circuit of TDA7293
Ⅷ. How to judge the fault of TDA7293?
The TDA7293 amplifier is a single-chip integrated circuit in a Multiwatt15 package, designed for audio class amplifiers in Hi-Fi field applications. In this article, we will describe its replacements and equivalents, pinout, features, specifications, and applications to give you a better understanding of this audio power amplifier.
The TDA7293, manufactured by ST (SGS-THOMSON), is a high-fidelity power amplifier integrated circuit with high power and voltage capabilities. It boasts a rated output power of 100W and can operate at a maximum voltage of 120V. The internal structure of TDA7293 is divided into three levels. Among them, the differential input stage is composed of bipolar transistors, and the push stage and power output stage are composed of field effect transistors. This design cleverly combines the characteristics of bipolar signal processing circuits and MOS power tubes, and has the advantages of low noise, low distortion, and high withstand voltage.
When the power supply voltage is ± 40V and the load is 8 Ω, its output power can reach 100W, but the harmonic distortion is only 0.005%. In addition, the chip has comprehensive protection mechanisms such as overvoltage protection, undervoltage protection, overload protection, power short circuit protection, thermal breakdown, and instantaneous high-temperature shock inside, which makes its performance superior to amplifiers assembled with general discrete and mixed components. Moreover, its external circuit is simple and easy to assemble. The conversion rate of TDA7293 reaches 15V/μs, which provides good conditions for sound quality performance.
Replacements and equivalents:
• LM1875
• LM3886
• NTE7165
• TDA2050
• TDA7294
The following figure shows the symbol, footprint and pin configuration of TDA7293 respectively.
TDA7293 has a total of 15 pins. Among them, pin 1 is connected to the negative power supply (V-), pin 5 is connected to the input signal ground, and pin 7, pin 8, and pin 9 are the non-inverting input terminal (IN+) and the inverting input terminal ( IN-) and control pin (STBY). The output ports include numbers 11, 13 (positive pole), 10, and 12 (negative pole), and are used in parallel with a 10uF capacitor to prevent high-frequency oscillation.
TDA7293 has a total of 15 pins. Among them, pin 1 is connected to the negative power supply (V -), pin 5 is connected to the input signal ground, and pin 7, pin 8, and pin 9 are the non inverting input terminal (IN+), inverting input terminal (IN-), and control pin (STBY), respectively. The output ports include pin 11, pin 13 (positive), pin 10, pin 12 (negative), and are used in parallel with a 10uF capacitor to prevent high-frequency oscillation.
• It has adjustable input sensitivity that can adapt to different input signal levels.
• TDA7293 supports single-ended and bridge operating modes.
• It has strong load carrying capacity and can withstand loads up to 4 ohms.
• With a minimal distortion rate, it can guarantee the preservation of the audio signal's original quality.
• Under appropriate supply voltage and load conditions, the maximum output power of TDA7293 can reach 100W.
• TDA7293 has low total harmonic distortion and high slew rate, which helps improve sound quality. In addition, its 100KΩ input impedance and 20Hz to 20KHz frequency response range make it excellent in audio performance.
• In addition, its input impedance of 100K Ω and frequency response range of 20Hz to 20KHz make it excellent in terms of audio performance.
• TDA7293 integrates multiple protection functions such as over-temperature protection, over-current protection and short-circuit protection, which can effectively protect the chip from external faults.
The technical parameters of TDA7293 are similar to TDA7293V.
• Professional audio equipment: Since TDA7293 has high output power and audio performance, it can also be used in professional audio equipment, such as stage audio systems, studio monitoring audio and other fields.
• Power amplifier module: It can be used as an independent power amplifier module and embedded in various audio equipment such as power amplifier boards and audio receivers.
• TV and multimedia systems: In TVs, multimedia players and other entertainment equipment, the TDA7293 can be used as an audio power amplifier to provide high-quality audio output.
• Audio system: It is often used to build home audio systems, including preamplifiers, stereo amplifiers, power amplifiers, etc. With proper design, we can build a high-quality sound system.
• Car audio system: TDA7293 can also be used in car audio systems. It can provide enough power to drive the speakers in the car, thereby providing clear and powerful sound for the car audio system.
• Audio amplifier: TDA7293 is a dual-channel (stereo) audio power amplifier with high output power and low harmonic distortion, suitable for driving speakers. It is widely used in audio systems, home theater systems and other applications.
In audio power amplifier circuits, TDA7293 and TDA7294 are two commonly used chips. They differ in the following aspects.
1. Voltage power
The TDA7293 has a rated power output of 100W and a maximum operating voltage of 120V. The TDA8954 operates over a voltage range of ±12.5V to ±42.5V. At ±41V voltage, when RL is 4W, its output power can reach 2x210W. If it is connected as a BTL amplifier, the output power can reach 420W.
2. Technology
The TDA7293 chip is packaged in Multiwatt-15. The differential input stage is composed of bipolar transistors, and the drive stage and power output stage use DMOS field effect transistor semiconductor technology. The TDA8954 power amplifier IC is packaged in HSOP24 and uses a mos field effect transistor as the output stage internally.
3. Manufacturing company
TDA7293 is a class AB monolithic audio power amplifier integrated circuit manufactured by STMicroelectronics in the 1990s. The TDA8954 is a high-power class D power amplifier IC manufactured by the Dutch Philips company.
When judging the fault, we can first use a multimeter to measure whether the power supply voltage of the TDA7293 power amplifier stage (pins 13 and 15) and the front stage (pins 7 and 8) is normal. If the power supply voltage of the above pins is abnormal, we can disconnect the above pins and individually measure whether the output voltages of these positive and negative power supplies are normal. If the output voltage is abnormal, we should check the power supply circuit for faults. If the output voltage of the power supply circuit is normal after disconnecting the above pins of the TDA7293, then we need to focus on checking the TDA7293 and its related circuits. At this time, we can use the resistance setting of the multimeter to measure whether the forward and reverse resistances between pins 13, 15 and the ground terminal (pin 4) and between pins 7 and 8 and the ground terminal are normal. If a certain pin shows a small resistance, then we can determine that the internal circuitry of the TDA7293 is damaged. In addition, we also need to check whether the voltage of the standby terminal (pin 9) and silent terminal (pin 10) of the TDA7293 is normal. If the voltage of these two pins is abnormal, it may also cause the output to be silent.
Frequently Asked Questions
1. What is TDA7293?
The TDA7293 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications, such as home stereo, self powered loudspeakers and Topclass TV.
2. What is the substitute for TDA7293?
You can replace TDA7293 with TDA7294.
3. What is the price of TDA7293 IC in India?
STMicroelectronics TDA7293V Audio Amplifier IC, Through Hole, Price from Rs. 523/unit onwards, specification and features.
4. What is the typical application of the TDA7293?
The TDA7293 is commonly used as a power amplifier in audio applications such as home theaters, stereo amplifiers, and other audio amplification systems.
5. What is the difference between TDA7294 and TDA7293?
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.
