TDA2009A: Pin Configuration, Internal Structure, and Alternative Models

By STMicroelectronics 81

TDA2009A: Pin Configuration, Internal Structure, and Alternative Models

TDA2009A is a dual-channel audio power amplifier with the characteristics of large output power (dual 10W), large output current (3.5A), overheating protection circuit, few external components, and simple installation. In addition, its maximum operating voltage is 28V, the typical operating voltage is 24V, and the normal operating voltage range is 8~28V.

TDA2009A contains all the necessary functions of a two-channel power amplifier, such as input stage, amplification stage and output stage, and can directly drive speakers. TDA2009A is widely used in small audio systems, car audio and other audio equipment requiring low power amplification.

Ⅰ.Specifications of TDA2009A

•Number of circuits:1
•Number of channels:2
•Number of pins:11
•Gain:36 dB
•Subcategory:Audio ICs
•Width:5 mm
•Height:10.7 mm
•Length:19.6 mm
•Output current:4.5 A
•Pd-Power dissipation:20 W
•Operating power supply current:3.5 A
•Product Category:Audio Amplifier
•Product:Audio Amplifiers
•Output power:12.5 W
•Installation style:Through Hole
•Type:2-Channel Stereo
•Audio-Load Impedance:8 Ohms
•Supply voltage-Maximum:28 V
•Supply voltage-Minimum:8 V
•Minimum operating temperature:-40℃
•Maximum operating temperature:+150℃
•Output signal type:Single
•Number of channels:2 Channel
•PSRR-Power Supply Rejection Ratio:55 dB
•Output current(Max):4500 mA
•Output type: 2 channels (stereo)
•Product Type:Audio Amplifiers
•Operating power supply voltage:9 V, 12 V, 15 V, 18 V, 24 V
•Maximum output power x number of channels at different loads:12.5W x 2 @ 4 ohms


Ⅱ.Functional features of TDA2009A

1.Wide-band response: TDA2009A has a wide frequency response range, from 20Hz to 20kHz, which can cover the entire audio range audible to the human ear. This enables it to restore the details and dynamic range of audio signals and provide good sound quality performance.

2.Easy to use: TDA2009A has a wide operating voltage range, from 8V to 28V, and it is recommended to use a 12V power supply. In addition, it also provides a variety of packaging forms, such as direct plug-in, SIP, etc., allowing users to choose the appropriate packaging form according to different applications. At the same time, the pin configuration of TDA2009A is simple, making installation and debugging relatively easy.

3.High power output: TDA2009A can output 10 watts of power per channel under a 4-ohm load, and the total output power of the two channels is 20 watts. This enables it to drive larger-power speakers and generate sufficient sound pressure levels to meet the needs of home audio, car audio and other applications.

4.Multiple protection functions: TDA2009A has multiple protection functions such as overheating protection and short-circuit protection, which can protect the chip from damage and extend the service life of the device. These protection features ensure that the device can still work stably under abnormal conditions and avoid damage to the audio system.

5.Low distortion: TDA2009A uses advanced circuit design and high-quality components to reduce the distortion rate of audio signals. The distortion rate is less than 0.5%, which means that the original shape of the audio signal is well preserved, making the sound sound more natural and clear.

6.Dual-channel power amplifier: TDA2009A is a dual-channel audio power amplifier that can process audio signals of the left and right channels simultaneously.

7.Simple circuit design: Due to the integration of many necessary circuit functions, using TDA2009A can simplify the design of the overall audio amplifier circuit.

Ⅲ.Pin configuration of TDA2009A

•Pin1(NIN1):Left channel audio signal input
•Pin2(IN1):Left channel inverting input
•Pin3(SVRR):Ripple suppression
•Pin4(IN2):Right channel inverting input
•Pin5(NIN2):Right channel audio signal input
•Pin7(NC):Empty pin
•Pin8(OUT2):Right channel audio power output
•Pin9(VS):VCC power input
•Pin10(OUT):Left channel audio power output
•Pin11(NC):Empty pin


Ⅳ.Application fields of TDA2009A

1.Audio interface: In some audio interface circuits, such as computer audio output interface, mobile phone audio output interface, etc., TDA2009A can be used as an amplifier to enhance the output power of the audio signal to provide a better audio experience.

•Computer audio interface: In personal computers, especially desktop computers, the audio output interface is usually implemented through an integrated sound card on the motherboard or a separate sound card. TDA2009A can be used as a post-power amplifier for these sound cards, providing stronger audio output to drive higher-level speaker systems, thereby bringing users a clearer, wider dynamic range sound quality experience.

•Mobile phone audio interface: In mobile phones or other mobile devices, although the built-in audio output power is usually enough to drive small speakers or headphones, in some high-end or professional audio applications, such as external speakers, car speakers, etc., enhanced The output power of the audio signal may be useful. The TDA2009A's compact package and low power consumption make it ideal as an external audio amplifier for cell phones and other mobile devices.

2.Car audio: TDA2009A is often used in car audio systems to drive speakers inside the car and provide amplification and playback of audio content such as music and radio. In car audio systems, the TDA2009A is usually used as a power amplifier, responsible for converting audio signals into enough power to drive the speakers inside the car. Whether it's broadcasts received via your car radio or music played via other means such as Bluetooth, USB or CD, the TDA2009A delivers clear, powerful audio output.

3.Electronic products: Including portable radios, small wireless speakers, game consoles, electronic keyboards and other electronic products, TDA2009A can be used to provide the required audio amplification function.

•Portable radio: For portable radios, TDA2009A can provide enough power for its built-in speakers, allowing users to hear broadcast content clearly even in noisy environments. At the same time, due to the low power consumption characteristics of TDA2009A, it is also suitable for use in battery-powered portable devices.

•Small wireless speaker: For a small wireless speaker, the TDA2009A’s high-fidelity audio output capability enables it to provide users with a high-quality audio experience. Whether at home or outdoors, this speaker can provide users with excellent sound quality.

•Game consoles: In game consoles, TDA2009A can be used to enhance the output power of game sound effects, allowing players to be more immersed in the game world. Whether it is in-game background music or game sound effects, they can all be excellently presented through TDA2009A.

•Electronic keyboard: For instruments such as electronic keyboards, TDA2009A can be used to amplify its audio output, allowing players to hear their own performance in a larger space, or to bring more shocking sound effects to the audience during performances.

4.Small audio systems: Including personal audio, mini audio, desktop audio and other small audio systems, TDA2009A can provide enough power to drive small speakers, making the audio system have better sound quality and volume performance.

•Personal audio: In personal audio equipment, such as headphone amplifiers or portable speakers, the TDA2009A can provide enough power to drive small speakers or headphones, ensuring users a good listening experience. At the same time, its low-power design is also suitable for long-term use scenarios, such as outdoor travel or long-term study work.

•Mini speakers and desktop speakers: For mini speakers and desktop speakers, TDA2009A can not only provide the required power, but also ensure sound quality. These speakers are typically placed on a tabletop or in a smaller space, requiring a compact and efficient audio amplifier. The high-fidelity audio output and low-distortion characteristics of TDA2009A make it very suitable for such applications and can provide users with an excellent sound quality experience.

Ⅴ.Electrical Characteristics of TDA2009A
(refer to the stereo application circuit,Tamb = 25℃, Vs=24V, GV =36dB, unless otherwise specified)


Ⅵ.Example of Muting Circuit of TDA2009A


Ⅶ.Internal structure of TDA2009A

1.Amplification stage: Responsible for amplifying the input signal, usually using a two-channel amplifier structure, which can amplify the audio signals of the left and right channels respectively.

2.Bias circuit: used to provide a suitable operating point to ensure linear amplification and minimal distortion of the output waveform.

3.Input stage: Responsible for receiving external audio signals and preprocessing them. It usually includes components such as input capacitors and input resistors for DC isolation, AC isolation and providing appropriate input impedance.

4.Feedback network: used to stabilize the gain and frequency characteristics of the amplifier, usually including negative feedback circuits and filters.

5.Output stage: Responsible for driving the amplified audio signal to the speaker, usually including components such as output transistors and output capacitors for output impedance matching and DC isolation.

6.Protection circuit: including overheating protection, short circuit protection, overvoltage protection and other functions, used to protect integrated circuits and external circuits from damage.

7.Power management: Responsible for managing the power supply, usually including power filtering, voltage stabilization, overvoltage protection and other functions to ensure that the amplifier works under stable power conditions.

Ⅷ.Replacement model of TDA2009A


Frequently Asked Questions

1.What is the maximum output power provided by the TDA2009A?
The TDA2009A can provide a maximum output power of typically around 10 watts per channel into a 4-ohm load with a 14.4V power supply.

2.What protection features are integrated into the TDA2009A?
The TDA2009A typically includes protection features such as thermal shutdown, short-circuit protection, and overvoltage protection.

3.What are the key parameters to consider when designing a circuit with the TDA2009A?
Key parameters to consider include supply voltage, output power requirements, load impedance, and thermal considerations.

4.How does the TDA2009A compare to similar amplifier ICs in terms of performance and features?
The TDA2009A offers a balance of performance, features, and cost compared to similar amplifier ICs, making it suitable for various audio amplification applications.