MC7808CT

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MC7808CT application field and working principle

The MC7808CT is a three-terminal linear regulator with a fixed output voltage of 8V. It is one of the many models in the voltage regulator family of MC78XX linear regulators, manufactured by Texas Instruments (TI). Each member in the family has a fixed output voltage that can be adjusted by the end user.

The output voltage of the MC7808CT is ideal for powering a variety of small circuits and other applications that require a constant 8V. The output current can range from 1mA to 1A, making it well suited for low-power operations that require steady supplies of 8V. The MC7808CT offers low dropout performance, meaning that it is capable of providing 8V even when the voltage supplied is just 8.5V. Such performance helps ensure reliable power delivery in any condition.

As for its working principle, the MC7808CT operates on the principle of a series pass regulator. In essence, it is a simple circuit comprising of an adjustable series pass element (pass transistor) and a voltage reference. The voltage reference is set to a particular value – in this case, 8V. Whenever the input voltage exceeds that of the reference, the transistor is turned on and a current passes through the series element, thereby regulating the voltage output.

The MC7808CT also features a built-in thermal shutdown circuit. This feature helps protect the regulator against thermal overloads. The thermal shutdown feature is triggered when the junction temperature of the regulator reaches 140°C. At this point, the regulator automatically shuts down and current ceases to flow. The device will remain off until the temperature falls below 130°C. Once this happens, the regulator will switch on automatically and resume its normal operation.

The MC7808CT is available in an 8-pin surface mount package (TO-220) for easily integrated with other circuit elements. The device is optimized for high-efficiency and minimal noise, making it suitable for a variety of applications. Typical applications of the MC7808CT include powering microcontrollers and other low-power electronics, powering wireless communication systems and mobile systems, providing accurate output voltage for various analog circuits, and automotive applications.

In summary, the MC7808CT is a highly reliable three-terminal linear voltage regulator with a fixed output voltage of 8V. It operates on a series pass principle and offers a wide input voltage range. It also features an integrated thermal shutdown circuit to guard against thermal overloads. And, it is available in an 8-pin surface mount package and is optimized for high efficiency and minimal noise. All these features make it an ideal choice for powering a vast range of low-power applications.

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