TDA7377 Audio Power Amplifier Alternatives, Application and Other Details
18 March 2024
Ⅱ. Performance evaluation of TDA7377
Ⅲ. Internal circuit diagram of TDA7377
Ⅴ. PCB-layout grounding of TDA7377
Ⅵ. TDA7377 power amplifier chip parameters
Ⅶ. How to ensure the stability of the circuit when connecting TDA7377?
The TDA7377 is a class AB car radio amplifier produced by STMicroelectronics that has the flexibility to operate in a dual-bridge or quad single-ended configuration. The amplifier's unique output stage fully complementary architecture with internal fixed gain ensures maximum power performance with only a few external components. Due to its excellent performance, TDA7377 is widely used in professional audio equipment, home audio systems, car audio systems and other fields. This article will introduce the TDA7377 in detail so that you can have a deeper understanding and application of this chip.
TDA7377 is a dual-channel power amplifier with a wide input voltage range of 14V to 25V and a power output of more than 30W. In addition, the chip also has many outstanding features, such as low distortion, high signal-to-noise ratio and excellent anti-interference performance. These features make TDA7377 outstanding in the field of audio effects. In terms of sound effects, its low distortion and high signal-to-noise ratio ensure the clarity and accuracy of audio output, while its powerful anti-interference performance helps eliminate interference from external factors on the sound effects. These advantages, coupled with its high power output, make the TDA7377's audio performance outstanding. In addition, the chip is also equipped with a variety of protection functions, such as over-temperature protection and short-circuit protection. These protection functions further improve the reliability and stability of the chip, making it safer and more reliable in use.
Alternatives and equivalents:
• TDA7375
• TDA7379
• TDA7560
We can evaluate the performance of TDA7377 from the following aspects.
1. Frequency response: Frequency response refers to how the amplifier responds to input signals of different frequencies. You can evaluate the frequency response of the TDA7377 by inputting signals of different frequencies and measuring the amplitude of the output signal.
2. Cross-harmonic distortion: Cross-harmonic distortion refers to the harmonic components contained in the output signal whose frequencies are the sum or difference of the input signal frequencies. You can determine the presence of cross-harmonic distortion by inputting signals of two or more frequencies and analyzing the output signal.
3. Power consumption and efficiency: TDA7377 is a highly efficient audio power amplifier. The evaluation of its power consumption and efficiency mainly focuses on parameters such as its operating voltage, actual current consumption, and conversion efficiency. The higher the conversion efficiency, the better the device is at converting input signals into actual output power. Otherwise, there may be problems with sound quality loss or energy waste.
4. Audio output power: This is an important indicator of the TDA7377's output power. Usually, you can measure the output power by connecting a suitable load (e.g., an 8-ohm speaker) and under specific conditions (e.g., a specific input level and frequency).
5. Signal-to-noise ratio (SNR): SNR represents the ratio between the output signal and the input signal. You can connect the TDA7377 to a static input and measure the signal level at the output, then calculate the SNR by turning off the input signal and measuring the noise level at the output.
The TDA7377 is often used in the following areas:
• Car audio system: TDA7377 is very suitable for car audio system, which can be used to drive the speakers in the car and provide high quality audio output. It has a high power output and low voltage operation characteristics, which is very suitable for the car environment.
• Television and home theater systems: The TDA7377 can upgrade the sound output of an ordinary TV to a high quality level by means of precise audio algorithms and advanced audio processing technology, bringing viewers a clearer, more three-dimensional and layered sound experience.
• Professional audio equipment: The TDA7377 shows wide applicability in the field of professional audio equipment. It not only plays a key role in the home audio system, such as stereo amplifiers, Hi-Fi front-end, multi-channel surround sound system and other occasions can be seen in its figure, providing high-quality audio signal processing.
• Multimedia speaker: TDA7377 provides enough driving force for speakers with its excellent power output capability. Whether you are enjoying music, watching movies or playing games, the TDA7377 ensures that the audio signal is fully amplified to present clear sound effects. At the same time, the TDA7377's low distortion and high signal-to-noise ratio characteristics make the speaker output sound clearer. Both high and low frequencies can be accurately reproduced, allowing users to immerse themselves in high-quality music and sound environment.
• Home audio system: TDA7377 can be used to build power amplifier modules to drive a variety of home speakers, including bookshelf speakers, stereo systems or surround sound systems, etc. The low distortion characteristics of the TDA7377 ensures the purity of sound effects. In home audio systems, users often have very high requirements for sound quality. The TDA7377 is able to accurately restore audio signals, avoiding sound distortion and distortion, so that users can feel the natural sound effects.
The device has 2 distinct ground leads, P-GND (POWER GROUND) and S-GND (SIGNAL GROUND) which are practically disconnected from each other at chip level. Proper operation requires that P-GND and S-GND leads be connected together on the PCB-layout by means of reasonably low-resistance tracks.
As for the PCB-ground configuration, a star-like arrangement whose center is represented by the supply-filtering electrolytic capacitor ground is highly advisable. In such context, at least 2 separate paths have to be provided, one for P-GND and one for S-GND. The correct ground assignments are as follows:
• Standby capacitor, pin 7 (or any other standby driving networks): on S-GND
• Svr capacitor (pin 6): on S-GND and to be placed as close as possible to the device.
• Input signal ground (from active/passive signal processor stages): on S-GND.
• Supply filtering capacitors (pin 3, 13): on P-GND. The (-) terminal of the electrolytic capacitor has to be directly tied to the battery (-) line and this should represent the starting point for all the ground paths.
TDA7377 is a dual four-channel power output audio power amplifier chip with the characteristics of high efficiency and low distortion. It is suitable for audio systems, car audio and other fields. When selecting and applying TDA7377, we need to understand its main parameters in order to determine the appropriate specifications and models. The following are the main parameters of TDA7377:
• Working voltage range: 8V~18V;
• Output power: 2x30W (4Ω load, THD=10%);
• THD (distortion): 0.02%;
• Noise signal to noise ratio: 98dB.
Among them, the operating voltage range refers to the voltage range in which TDA7377 can work normally; the output power refers to the maximum power that TDA7377 can output; THD refers to the degree of distortion, that is, the degree of error between the output signal and the input signal; the noise signal-to-noise ratio is refers to the ratio between useful signals and useless signals in the output signal.
In addition to the parameters mentioned above, there are some other parameters that are also worth considering, such as quiescent current, temperature coefficient, and packaging form. Therefore, when selecting the TDA7377 power amplifier chip, we need to comprehensively consider various parameters and make a selection based on actual needs.
When connecting TDA7377, we need to consider the following factors:
• Reasonable wiring and routing: When wiring and routing on the board, we should avoid long and too thin wires to reduce signal attenuation and resistance. At the same time, we should make sure the audio signal alignment is as short as possible to minimize signal loss and interference.
• Proper grounding design: Good grounding is the key to ensure the stable operation of the circuit. We need to make sure that the ground pin of the TDA7377 is connected to a low-impedance ground plane and avoid forming loops with other signal lines to minimize noise and interference.
• Proper power supply design: The TDA7377 needs a stable power supply to operate. We need to make sure that the power supply voltage supplied to it is within the specified range (14V to 25V), and the power supply should have sufficient filtering and decoupling capabilities to minimize the impact of power supply fluctuations on the circuit.
• Appropriate thermal design: TDA7377 will inevitably generate a certain amount of heat due to the flow of internal current and voltage during operation. This heat accumulation, if not effectively distributed, may lead to excessive chip temperature, which in turn affects its performance or even damages the circuit. Therefore, in order to ensure that the TDA7377 can work stably and efficiently, we need to pay special attention to its heat dissipation design.
• Avoid external interference: When connecting the TDA7377, we should take a series of effective measures to avoid external electromagnetic interference, to ensure the stability and accuracy of the circuit work. First of all, in order to eliminate or inhibit possible electromagnetic interference, we can use cables with good shielding performance, which are usually wrapped in a metal shell, and can effectively shield or absorb external electromagnetic signals. In addition, in order to further minimize the impact of possible electromagnetic interference on the circuit, we can install filters to filter out specific frequency signals, thus preventing these signals from adversely affecting other circuits or systems.
Frequently Asked Questions
1. What is the difference between TDA7377 and TDA7379?
The TDA7377 operates with an operating supply voltage of 18V, while the TDA7379 operates with an operating supply voltage of 20V. These two amplifiers are equivalent to each other in many aspects.
2. What is TDA7377?
E-TDA7377 is a 2x30w dual/quad power amplifier for car radio. The exclusive fully complementary structure of the output stage and the internally fixed gain guarantees the highest possible power performances with extremely reduced component count. The on-board clip detector simplifies gain compression operation.
3. How many watts is TDA7377?
The TDA7377 is a 2 x 30-Watt Dual/Quad Power Amplifier. It can deliver 35 watts of audio power into a 2 channels @ a 4 Ohm load with 10% THD. It comes in the 15-pin Mulitwatt package. See the Datasheet for more details.
4. What is the equivalent of TDA7377?
The TDA7377 operates with an operating supply voltage of 18V, while the TDA7379 operates with an operating supply voltage of 20V. These two amplifiers are equivalent to each other in many aspects. In addition, TDA7375 and TDA7560 are equivalents for TDA7377.
