Designing a 24W Power Amplifier Circuit using IC TDA1516

The TDA1516 is a cool Class B power amplifier that comes in a 13 pin Single In Line (SIL) package.

It is designed for many audio amplification jobs and has some great safety features like short circuit protection, thermal shutdown and protection against reverse polarity.

When set up in a Bridge Tied Load (BTL) configuration, it can deliver up to 24 watts of power to a 4 ohm speaker, making it a fantastic option for different uses especially in car audio systems.

Circuit Working:

Parts List:

The TDA1516 amplifier circuit is designed to deliver 24W of power and operates in a special setup called Bridge Tied Load (BTL) mode.

This setup is smartly designed to boost the output power by nearly doubling the voltage sent to the speaker terminals.

To power this circuit a 12V DC power supply is used.

This power supply is important because it provides energy to the TDA1516 integrated circuit.

Capacitors are also used in the circuit to help with decoupling and filtering which keeps everything running smoothly.

The audio signal enters the TDA1516 through pin 13 via a coupling capacitor C1.

The purpose of this capacitor is to block any direct current DC from the input signal allowing only the alternating current AC audio signal to pass into the amplifier.

Once the audio signal is inside the TDA1516 IC it gets amplified.

The IC contains two identical amplifiers that work together in BTL mode.

In this mode one amplifier drives the positive side of the speaker while the other drives the negative side with an inverted signal.

This clever design effectively doubles the voltage swing across the speaker leading to much higher output power.

The improved signal is sent to the speaker through pin 5 which is the positive connection and pin 9 which is the negative connection.

In this setup the C2 capacitor is placed across the supply rails.

This setup blocks any direct current DC while allowing the amplified alternating current AC signal to pass through easily.

Also, the C3 capacitor is located near the power supply pins of the integrated circuit.

Its main job is to keep the voltage steady for the power source and reduce any high frequency noise that could disrupt performance.

These capacitors are really important for making sure the amplifier works well without any distortion caused by changes in the power supply.

A 4Ω speaker is used as the load, which turns the amplified electrical signal into sound that we can hear.

The speaker works in a bridge tied load BTL mode which helps to get the most out of the amplified signal.

Plus, there is an On/Off switch S1 in the circuit to control the power to the amplifier.

When you turn on the switch it lets the circuit amplify the incoming audio signal properly.

The TDA1516 integrated circuit has built in safety features like thermal shutdown and short circuit protection to keep the circuit safe while it is working.

Formulas:

Following are the formulas to help you understand and design a 24W Power Amplifier Circuit using IC TDA1516

Output Power:

The output power P delivered to the load can be calculated using the formula:

P = Vrms2​​ / RL​

where,

• Vrms​ is the root mean square voltage across the load.
• RL is the load resistance in 4 ohms speaker

Gain Calculation:

The voltage gain A_v of the TDA1516 in BTL mode is internally set and can be determined from the datasheet.

Assuming a typical gain of 20 dB:

Av​ = 10_^20/20​ = 10

This means that the output voltage is 10 times the input voltage.

How to Build:

For Designing a 24W Power Amplifier Circuit using IC TDA1516 follow the below mentioned steps for connections:

• Assemble all the components mentioned in the above circuit diagram
• Connect pin 1 of IC1 TDA1516 to pin 4 of IC1.
• Connect pin 2 of IC1 TDA1516 to pin 13 of IC1.
• Connect pin 3 and 7 of IC1 TDA1516 to GND.
• Connect pin 5 of IC1 TDA1516 to one end of 4Ω speaker and other end of 4Ω speaker to pin 9 of IC1
• Connect pin 6, 8 and 10 of IC1 TDA1516 to +12V positive supply.
• Connect pin 10 of IC1 TDA1516 to one end of S1 switch and other of of S1 switch to pin 11 of IC1.
• Connect pin 13 of IC1 TDA1516 to Audio in through capacitor C1 and GND.
• Connect capacitor C3 from positive supply to GND.
• Connect capacitor C2 from positive supply to GND.

Conclusion:

The Designing a 24W Power Amplifier Circuit using IC TDA1516 is a strong choice for boosting sound especially in cars.

It works well with a 12V power source and has safety features that help it run smoothly.

If you learn how the circuit works and do the right calculations, you can use this amplifier in many different projects.

References:

TDA2615 Datasheet