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Español320W Audio Amplifier 14.4V / 2Ω using TDA7560 IC + PCB
🔊 Compact Power: Meet the 320W TDA7560 Amplifier
Hello, electronics enthusiasts!
Today we’re going to explore an amplifier circuit that challenges the size-power ratio. Get ready to build a 320W audio amplifier using the TDA7560 IC, capable of delivering an impressive sound experience with just 14.4V of power supply!
Imagine having a powerful audio system in your car or in a portable project, without needing complex or bulky power supplies. This project offers exactly that: 4 channels of 80W each (totaling 320W) with a 2Ω load, powered by the simple voltage of 14.4V – the same provided by a vehicle’s alternator!
This circuit is perfect for both automotive applications and portable projects, eliminating the need for complicated symmetrical power supplies. Let’s dive into the technical details and discover how this little giant works?
💡 Why is the TDA7560 special?
The TDA7560 is a class AB audio integrated circuit specifically designed for automotive applications. Its ability to operate with low voltages and deliver high power makes it ideal for systems where space and energy efficiency are crucial.
⚡ Electrical Performance: Power in Detail
The TDA7560 was designed to offer exceptional performance in different configurations. Let’s analyze the power specifications so you can choose the ideal configuration for your project:
Power Configurations at the Outputs
For 4Ω load
- VS = 13.2V – THD 10% – 4 x 25 Watts
- VS = 13.2V – THD 1% – 4 x 19 Watts
- VS = 14.4V – THD 10% – 4 x 30 Watts
- VS = 14.4V – THD 1% – 4 x 23 Watts
For 2Ω load
- VS = 13.2V – THD 10% – 4 x 45 Watts
- VS = 13.2V – THD 1% – 4 x 34 Watts
- VS = 14.4V – THD 10% – 4 x 55 Watts
- VS = 14.4V – THD 1% – 4 x 43 Watts
Maximum Power (THD >10%)
- VS = 14.4V – 4Ω – 4 x 50 Watts
- VS = 14.4V – 2Ω – 4 x 80 Watts
📌 Important note: THD (Total Harmonic Distortion) measures the total harmonic distortion. The lower the THD value, the higher the sound fidelity. For critical listening, values below 1% are ideal.
✨ Features and Characteristics of the TDA7560
- 🔌 Excellent driving capability at 2Ω
- 🎵 Hi-Fi Distortion Class
- 🔇 Low output noise
- ⏸️ Stand-by function
- 🔇 Mute Function
- ⚡ Auto Mute at min. Supply voltage detection
- 🔋 Supply voltage range from 8 to 18 Volts
- 🧩 Low external component count:
- 📊 Internally fixed gain (26dB)
- 🔧 No external compensation
- 🔌 No Bootstrap Capacitors
- ⚡ Onboard 0.35A Driver
🔧 Standby and Mute Controls
The TDA7560 offers advanced control features that allow you to optimize power consumption and protect the system:
The Standby and Mute functions are compatible with CMOS logic, allowing direct control by microcontrollers or digital circuits. If you prefer a more traditional approach, you can use low-power transistors to activate these pins.
To avoid audible noise during transitions, it’s recommended to use an R-C set to smooth state changes. Especially for Stand-By mode, the time constant should be slower than 2.5V/ms to ensure a practically “pop-up” free transition.
📋 Circuit Schematic Diagram
In Figure 2 below, we present the complete schematic diagram of our audio amplifier with 320W of power powered with 14.4V using the TDA7560 IC.
Notice the simplicity of the circuit – despite its high power, the design is surprisingly clean and direct, making it accessible even for enthusiasts with intermediate experience in electronics. This simplicity not only facilitates assembly but also increases the reliability of the system.
🔌 Power Supply
To ensure maximum performance of this amplifier, the power supply must provide current of at least 7 Amperes. It’s crucial to respect the maximum voltage limit of 18 Volts specified by the manufacturer – exceeding this value can permanently damage the integrated circuit.
💡 Expert tip:
For automotive applications, consider adding a circuit for protection against voltage spikes and polarity reversal. This will significantly increase the lifespan of your amplifier, especially in older vehicle electrical systems.
🛠️ Bill of Materials
- IC 1 …………………………. Integrated Circuit TDA7560
- R1 …………………………… Resistor 10KΩ (brown, black, orange, gold)
- R2 …………………………… Resistor 47 KΩ (yellow, violet, orange, gold)
- C1, C2 …………………….. Ceramic / polyester 1μF
- C3, C4, C5, C6, C9 ….. Ceramic / polyester 0.1μF
- C7 …………………………… Ceramic / polyester 470nF
- C8 …………………………… Electrolytic Capacitor 47μF – 63V
- C10 …………………………. Electrolytic Capacitor 2.200μF – 25V
- CN 1, 2, 4, 5, 6, 7, 8 ….. 2-Pin Board-Cable Connector
- CN 3 ………………………. 5-Pin Board-Cable Connector
- Miscellaneous ………………….. Printed Circuit Board, solder, wires, etc.
🖨️ The Printed Circuit Board (PCB)
📁 Direct Link to Download
To download the necessary files for assembling the electronic circuit, just click on the direct link provided below:📥 Download Link: PNG, PDF, GERBER Files
For an even more complete experience, we have prepared a detailed video showing the step-by-step assembly and power tests of our amplifier. Follow all the details and discover how to get high-quality sound in your audio projects:
🤔 Frequently Asked Questions (FAQ)
To ensure your project is a success, we have compiled some of the most common questions about this amplifier with TDA7560 IC. Check it out!
Can I power this amplifier directly from the car battery? 🔽
Yes! This amplifier was specifically designed to work with the voltage of an automotive electrical system (12V with the car off and approximately 14.4V with the engine on). However, we recommend adding a line filter and a protective fuse to ensure the safety of the system.
What’s the difference between using 4Ω and 2Ω speakers? 🔽
Speakers with 2Ω impedance allow the amplifier to deliver more power (up to 80W per channel with THD >10%), but require more current from the power supply. 4Ω speakers consume less current and offer slightly better audio quality with lower distortion, but with reduced maximum power (up to 50W per channel with THD >10%).
Do I need a heat sink for the TDA7560 IC? 🔽
Yes, absolutely! The TDA7560 generates significant heat during operation, especially at higher volumes or with low-impedance speakers. We recommend an adequate heat sink, preferably with forced ventilation for continuous operation at high powers.
Can I use this amplifier for a residential audio system? 🔽
Yes, it’s possible, but you’ll need an adequate power supply that provides at least 7A at 14.4V. There are bench power supplies with these specifications, or you can build a specific supply for this purpose. Remember that the voltage should not exceed 18V to avoid damaging the IC.
How does the Standby function work and how to implement it? 🔽
The Standby function puts the amplifier in low power consumption mode when not in use. To implement it, you can use a simple switch or a control circuit (like a microcontroller) to apply an appropriate voltage to the IC’s Standby pin. It’s recommended to use an RC circuit to smooth the transition and avoid audible noise.
🔗 Explore More Amazing Projects
Did you like this project? Then you’ll love exploring other charger circuits we’ve prepared. Each with its own peculiarities and ideal applications!
Original article published in FVML (Portuguese) – May 14, 2020
✨ Our Gratitude and Next Steps
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