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35 Watt Stereo Amplifier Using the TDA7377 with a 12V DC Supply

TDA7377 35watt amplifier circuit diagram

Building a car audio amplifier circuit is not a complex process. Many ICs are available on the market, and they typically require only a few number of external components to work. One of the popular choices is the TDA7377. This car audio amplifier IC operates on a DC supply of 12 to 18 volts. The quality of the sound is nice. The TDA series of ICs are commonly used in audio amplification. Let’s take a closer look at the circuit diagram, pinout, and additional information about the TDA7377 IC.

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TDA7377 IC Pinout Configuration

TDA7377 IC Pinout diagram
Fig:2 TDA7377 Pinout
Pin NumberPin NameDescription
1OUT 1Output 1
2OUT 2Output 2
3VCCSupply Voltage
4IN 1Input 1
5IN 2Input 2
6SVRSupply Voltage Rejection
7ST BYStandby
8PW GNDPower Ground
9S GNDSignal Ground
10DIAGDiagnostics
11IN 4Input 4
12IN 3Input 3
13VCCPositive Supply Voltage
14OUT 4Output 4
15OUT 3Output 3
TDA7377 IC Pin Configuration

Features of TDA7377 IC

  • High output power capability of 2×35 watts at 4 ohms speaker.
  • This IC can use in different configurations such as stereo bridge mode or 4 channel audio system.
  • Stand by function.
  • Few number of external components needed.
  • No Pop up sound during stand by operations.
  • Class AB high quality audio output.
  • Operating supply voltage 12 to 18V DC.
  • Built in short circuit protection.

35 Watt Stereo Amplifier Using the TDA7377

TDA7377 circuit diagram
Fig:2 TDA7377 35 watt Stereo Bridge amplifier circuit

Components Required

ComponentsQuantity
TDA7377 IC1
0.47uf, 47uf, 10uf, 100nf, 1000uf Capacitor2, 1, 1, 1 ,1
10k Resistor1
Components list

The pin number 4 and pin number 5 are connected together and are connected to the 0.47uf electrolytic capacitor. This capacitor at the other end is connected to the input audio source. The same is happening on the pin number 12 and 11. The 6 th pin of the IC is grounded using a 47uf capacitor. The pin number 6 is a Supply voltage rejection pin of the IC.

10uf and a 10 k resistor is connected to the Stand by pin of the IC. The input voltage supply is well filtered by the help of a 1000uf electrolytic capacitor and 100nf disc or box type capacitor.

TDA7377 amplifier board

The amplifier output will be in bridge mode so connect the speaker connections directly to the IC output pins. The speaker connections are pin 1 and 2 the second speaker connection is Pin 15 and 14. You must connect a 35 watt 40hms speaker or woofer for this circuit.

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FAQ

How many watts is a TDA7377?

The TDA7377 car audio amplifier IC typically provides an output power of around 35 watts per channel when operating in a bridged configuration. In a quad configuration. The exact output can vary based on the supply voltage and load impedance of the speaker.

What is the difference between TDA7377 and TDA7297?

TDA7377 is a quad amplifier for car audio amplifier IC with low distortion. TDA7297 is a dual amplifier for both car and home applications with high distortion comparing with TDA7377 IC.

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