TDA7490

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Audio amplifiers are widely used in a variety of settings, from professional sound to the home music system. The TDA7490 is a power amplifier integrated circuit (IC) particularly suited to drive low impedance speakers.

The TDA7490 chip offers an easy-to-use power amplification system for audio devices, providing a super low cost solution for small power audio applications. It is particularly suited for low impedance speakers, such as 4 to 8 ohms or 2.1 to 2.6 ohms.

The TDA7490 is designed to be powered by 3.3 - 15V DC. At operating temperature, currents up to 4A can be supported. The output power is typically 18W with 4 ohm speakers, with a maximum peak power of 45W. The resulting sound is generally clean and clear, as the chip incorporates a built-in 15V voltage regulator with an adjustable gain control.

The chip also features protection features such as a thermal shutdown, current limiting, and adjustable saturations limiters. Moreover, the chip is specifically designed for low-noise operation and comes with zero-drift characteristics for long-term stability.

The working principle of the TDA7490 is based on the classical amplifier system, but with certain specific special features. It is composed of two main blocks: the input amplifier stage and the output stage. The input amplifier stage is responsible for amplifying and shaping the input signal as needed to feed the output stage. It is also responsible for providing the proper bias for the output stage and for setting the gain level.

The other main part is the output stage. The output stage is responsible for receiving the amplified input signal and further amplifying it before sending it to the speaker. This stage is usually composed of an internal series of transistors, and the specific design depends on the type of amplifier. In the case of the TDA7490, the output stage uses a pair of complementary pair transistors N-Type MOSFETs.

The TDA7490 is normally used in low-power applications, such as home theaters or car audio systems, but it can also be used in larger power applications, such as PA systems or studio monitors. In either case, the chip provides high quality amplification without the need for an expensive amplifier. Furthermore, it is extremely easy to use, which makes it a popular choice among both professionals and hobbyists.

In conclusion, the TDA7490 is a powerful and easy-to-use audio amplifier IC that is particularly suited for low impedance applications. It is designed to provide one of the most accurate and clean audio outputs, while also incorporating a variety of protection features to guard against overloads. As such, it is a perfect solution for both professional use and recreational activities.

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