TDA7560 Audio Power Amplifier: Symbol, Features and Application
26 September 2023
Ⅱ. Pin connection, symbol and footprint of TDA7560
Ⅵ. Are TDA7560 and TDA7851 interchangeable?
Ⅶ. TDA7560 car power amplifier circuit
Ⅷ. How to test the quality of TDA7560?
Ⅸ. TDA7560 application guidelines
The TDA7560 is an innovative class AB audio power amplifier incorporating pioneering BCD (bipolar CMOS/DMOS) technology. This advanced design is engineered to deliver robust power output tailored for car radio applications. Its output configuration boasts a fully complementary P-channel and N-channel setup, enabling it to achieve a full range of output voltage swings. Additionally, it exhibits remarkable attributes such as high output current capabilities and minimized saturation losses, setting it apart as an exceptional choice within the automotive radio sector. It has set a new benchmark for power performance and stands out with its exceptional distortion performance.
Replacement and equivalent：
• TDA7850
• 4-channel configuration
• Class AB amplifier with FETs in output stage
• High-fidelity class distortion: The TDA7560 is capable of processing audio signals in a high-fidelity manner, maintaining the original quality of the signal.
• Low output noise: It does not produce too much noise when working, thus maintaining the clarity of the audio.
• Multi-power BCD technology: TDA7560 uses advanced bipolar CMOS/DMOS technology, which can achieve high efficiency and stable performance.
• Standby function: When not in use, it can enter a low-power state to save energy.
• Excellent 2Ω drive capability: It maintains good performance when handling loads with a resistance of 2 ohms.
• Mute function: TDA7560 has the ability to turn off or mute the audio output, which is usually used to pause or turn off the audio output.
• MOSFET output power stage: MOS field effect transistor is a semiconductor device that can control current and is used as an output power stage to provide powerful audio output.
• Excellent output power capability: It can also provide higher output power for your car audio system, especially when you want high volume without distortion.
• Onboard 0.35A high-side driver: TDA7560 is internally configured with a high-side driver that can drive a current of 0.35 amps, making circuit design more convenient.
• Automatic mute function: When the power supply voltage drops to the lowest, it can automatically mute the sound, effectively preventing poor sound quality caused by low voltage.
• Automute at minium supply voltage detection: The TDA7560's design minimizes the need for external components, making it easier to integrate into automotive audio systems and reducing overall component costs.
1. Overload and short-circuit protection
It has built-in overload and short-circuit protection to ensure that the circuit is protected from damage under abnormal conditions. The overload protection function prevents the power adapter from being burned out when overloaded, while the short-circuit protection function prevents electronic components on the circuit board from being damaged due to accidental short circuits.
2. Sound effects processing
TDA7560 not only has high-performance audio processing capabilities, but also uses advanced sound effects processing technology. Among them, the equalizer can adjust the frequency response of the audio to make the sound clearer. The audio scene simulation technology can simulate different audio environments and bring a more realistic surround effect to the listener.
3. Electronic volume control
It can not only adjust the volume, but also avoid the safety hazards caused by manual volume adjustment during driving.
4. Multi-channel sound system
The TDA7560 supports multi-channel configurations and can typically be used to create a stereo sound system, including front channels, rear channels and subwoofer outputs. This makes it suitable for different types of vehicles and audio setups.
5. Low power consumption design
This not only reduces vehicle fuel consumption and vehicle operating costs, but also reduces exhaust emissions. In addition, low energy consumption design can also improve the service life of car batteries. Since the life of a car battery is closely related to the number of charge and discharge times, reducing the number of charge and discharge times of the battery through low energy consumption design can extend the service life of the battery.
6. Car audio systems
TDA7560 is commonly used in car audio systems to amplify audio signals from radios, CD players, MP3 players or other audio sources. It provides high-quality audio amplification and processing to improve sound quality and volume.
TDA7560 and TDA7851 have differences in the following aspects and therefore cannot be directly interchanged in some cases.
• Package: Although they are all in Flexiwatt 25 package, there may be some minor size differences or interface compatibility issues.
• Packaging and pin layout: These two chips have different packaging and pin layout, so when replacing, we need to ensure that the pins correspond correctly and comply with the correct PCB layout.
• Power supply configuration: TDA7560 uses a single power supply, while TDA7851 uses dual power supplies.
• Input voltage: The input voltage range of the TDA7851 is different from the TDA7560, which means they may require different input circuits.
• Output power: TDA7851 usually has higher output power, so it can drive more powerful speakers or higher volume sound systems.
First, we should carefully examine its appearance. A good audio power amplifier should have a neat appearance, with electronic components well-soldered and without false soldering or false soldering. At the same time, we also need to ensure that there is no physical damage or abnormality such as bent pins or cracked casing.
Next, we use a multimeter to measure the power and signal ports of the TDA7560. The power ports should have normal DC resistance values, while the signal ports should present the appropriate impedance to ensure proper operation of the amplifier.
Then, connect the audio source and speakers for a listening test. We input the audio signal to the signal input port of TDA7560, and then use the speaker to play the audio. Then we listen carefully to the playback effect and check whether the audio signal is amplified normally and there is no distortion or abnormal sound. If everything is working properly, the amplifier's performance is relatively reliable.
The final step is to perform a high temperature test. We placed the TDA7560 in a high temperature environment to observe its working status and performance. High-temperature testing can expose potential stability and reliability issues in an amplifier and help us judge its quality level.
1. Input Stage
The TDA7560's input stage is compatible with ground and can tolerate high input signals without compromising performance. If you use the standard 0.1uF input capacitors, the low-frequency cut-off will be approximately 16 Hz.
2. Supply Voltage Rejection(SVR)
In addition to its role in minimizing ripple, the SVR capacitor also controls the timing of the amplifier's turn-on and turn-off sequences. This is crucial for optimizing the suppression of popping sounds during these transitions. To address both aspects effectively, it is strongly recommended to use a minimum capacitor value of 10 uF.
3. DC Offset Detection
The TDA7560 incorporates a DC offset detector to prevent abnormal DC offsets at the amplifier's input from being amplified and causing potentially damaging output offsets that could harm speakers due to overheating. This feature is activated via the MUTE pin and operates even when the amplifier is unmuted and there is no signal at the inputs.
The DC offset detection is indicated through the HSD pin. To ensure the proper functioning of the Offset Detector, it is essential to connect a 10kΩ resistor between HSD and ground.
4. Standby and muting
Standby and Muting facilities are both CMOS-compatible. In absence of true CMOS ports ormicroprocessors, a direct connection to Vs of these two pins is admissible but a 470 kOhm equivalent resistance should be present between the power supply and the muting and ST-BY pins.
R-C cells have always to be used in order to smooth down the transitions for preventing anyaudible transient noises.
About the standby, the time constant to be assigned in order to obtain a virtually pop-freetransition has to be slower than 2.5 V/ms.
Frequently Asked Questions
1. What is the TDA7560?
The TDA7560 is a quad bridge car radio amplifier IC, designed for use in car audio systems to amplify audio signals for speakers.
2. What is the supply voltage range for the TDA7560?
The TDA7560 typically operates from a supply voltage of +8V to +18V DC.
3. How many channels does the TDA7560 have?
The TDA7560 is a quad-channel amplifier, meaning it can drive four separate audio channels or speakers.
4. What are some key features of the TDA7560?
Some key features of the TDA7560 include short-circuit and thermal protection, high output power, low distortion, and mute/standby functions.
5. Can the TDA7560 operate in bridge mode?
Yes, the TDA7560 can operate in bridge mode, which allows it to deliver higher power output to a single speaker by using two amplifier channels together.
