apogeeweb title
Home  Technical Articles   TDA2030: Typical Application Circuit

Sep 8 2020

TDA2030: Typical Application Circuit

I. Description

TDA2030A is one of the high-fidelity integrated power amplifiers, and many power amplifier circuits use this integration method. TDA2030 is also a HI-FI power amplifier integrated block used by many computer active speakers. It has simple connection method and affordable price. The rated power is 14W. The power supply voltage is ±6~±18V. The output current is large, the harmonic distortion and the crossover distortion are small (±14V/4 ohm, THD=0.5%). It has excellent short circuit and overheat protection circuit. The following describes its connection and application circuit.

tda2030

Catalog

I. Description

II. Connection

2.1 Single Power Connection

2.2 Dual Power Connection

III. Application Circuit

3.1 OTL Form Power Amplifier

3.2 OCL Form Power Amplifier

3.3 BTL Form Power Amplifier

3.4 40W Power Amplifier Circuit

3.5 High-fidelity Active Speaker Circuit

3.6 25W Bridge Low Frequency Power Amplifier Circuit


II. Connection

Its connection method is divided into single power supply and dual power supply:

2.1 Single Power Connection

TDA2030 single power connection diagram

Figure 1 TDA2030 single power connection diagram

2.2 Dual Power Connection 

TDA2030 dual power connection diagram

Figure 2 TDA2030 dual power connection diagram


III. Application Circuit

 

3.1 OTL Form Power Amplifier

OTL form power amplifier: single power supply, output coupling capacitor. The R5 (150 kΩ) and R4 (4.7 kΩ) resistors in the circuit shown in Figure 3 determine the closed-loop gain of the amplifier. The smaller the R4 resistor, the greater the gain, but too large gain can easily cause signal distortion.

Two diodes are connected between the power supply and the output terminal to prevent the inductive load of the speaker from kicking back and affecting the sound quality. The capacitor of C3 (0.22 uF) and the resistance of R6 (1 Ω) are used to compensate the inductive load (speaker) to eliminate self-excitation. The circuit uses a 36V single power supply and the output power is about 20W.

OTL type power amplifier made with TDA2030A

Figure 3 OTL type power amplifier made with TDA2030A

3.2  OCL Form Power Amplifier

The form of the OCL power amplifier adopts dual power supplies and has no output coupling capacitor. As shown in Figure 4, since the low frequency response of the output coupling capacitor is improved, it is a high-fidelity circuit. The dual power supply uses a transformer with the middle point of the primary coil grounded and the upper and lower voltages are symmetrical and equal. After rectification and filtering, a ±18 V dual power supply is formed, and the output power is 20W.

OCL type power amplifier made with TDA2030

Figure 4 OCL type power amplifier made with TDA2030

3.3. BTL Form Power Amplifier

 

The main feature of BTL is: it is composed of two identical power amplifiers, and the input signals are inverse to each other. The in-phase input and the inverted input of the amplifier are actually used to ensure that the input signals are inverse to each other. At the same time, the amplitudes of the two input signals should be the same, so that the basic requirements of the BTL circuit form can be met.

The circuit diagram is shown in Figure 5, where R7 (1 kΩ) and R8 (33 Ω) resistors divide the signal and the attenuation factor is exactly the same as the amplification factor of U1. The attenuated signal is added to the inverting input terminal of U2 through R5 .

In fact, two op amps complete a signal amplification, and the actual measured output level is 1.5 times higher than that of an integrated circuit. That is, the original output power of the op amp is 20 W, and the output power is now about 50 W.

However, due to the characteristics of the BTL circuit, when choosing an integrated circuit, use two operational amplifier circuits with the same parameters as much as possible to adjust the input signal amplitude. You can use an oscilloscope to observe the amplitude of the two input signals by inputting a sine wave. At this time, adjust R7 to make the two input signals The amplitude is the same to ensure that the nonlinear symmetry distortion is minimized while increasing the power.

BTL type power amplifier made with TDA2030A

Figure 5 BTL type power amplifier made with TDA2030A

3.4 40W Power Amplifier Circuit

 

Figure 6 is a 40W power amplifier circuit made by TDA2030 power amplifier integrated block and BD907/908:

40W power amplifier circuit made by TDA2030

Figure 6 40W power amplifier circuit made by TDA2030

3.5 High-fidelity Active Speaker Circuit

 

A high-fidelity active speaker circuit designed with TDA2030, the circuit diagram is shown in Figure 7. Using dual power supply, added high and low bass and volume adjustment. When designing the PCB, the ground wire should not pass through the component pins as much as possible to reduce DC noise.

High fidelity active speaker circuit diagram

Figure 7 High fidelity active speaker circuit diagram

3.6 25W Bridge Low Frequency Power Amplifier Circuit

25W bridge low frequency power amplifier circuit

Figure 8 25W bridge low frequency power amplifier circuit

The circuit in Figure 8 uses two TDA2030s connected to form a bridge circuit, with the same circuit structure and parameters on both sides. The integrated circuit on the right is controlled by the integrated circuit on the left through a 22kΩ negative feedback resistor, and vice versa. The diode 1N4001 is used to prevent the speaker inductive load from generating overvoltage and damaging the device. The amplification factor of the circuit can be adjusted by changing the negative feedback voltage ratio between the output terminal (pin 4) and the inverting input terminal (pin 2).

 

Related Articles

  • TDA2030: 14W Hifi Audio Amplifier [Video]
    TDA2030 DescriptionThe TDA2030 is a monolithic integrated circuit in Pentawatt® package, intended for use as a low-frequency class AB amplifier. Typically it provides 14W output power (d = 0.5%) a...

0 comment

Leave a Reply

Your email address will not be published.

 
 
   
 
Rating: