L7812T

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Voltage regulators are essential components for many types of electronics projects or designs.The L7812T is a three terminal positive voltage regulator from STMicroelectronics with several intuitive features and options. In this article, the application field and working principle of L7812T are discussed.

Overview of L7812T

The L7812T is a voltage regulator capable of providing a 12V output with a suitable input range of 9 to 18V while rated to deliver a maximum current of 1.5A. Other than the standard three terminal setup, it has an additional fourth terminal labeled “ADJ”, which is dedicated to providing an adjustable output without the need for additional components such as resistors or diodes.The device is protected against short-circuit conditions, over-voltage, and thermal overload which makes it suitable for use in a wide variety of applications with reliable output power.

Field of Applications

The L7812T is commonly used for various applications including logic supplies, programmable logic controllers, industrial electronics, and embedded computing. A common logic supply circuit application would require a 12V power supply for powering the elements such as resistors, capacitors and transistors used in the circuit.Due to its low quiescent current, the L7812T can be used in automotive applications where efficient power management is important and noise immunity is needed.It is also possible to use the device to provide a 12V power supply to tuned receivers, current amplifier and other components used in consumer electronics such as TVs, radios and other audio related products.

Working Principle of L7812T

The L7812T operates on a voltage feedback principle. When the output voltage drops, the device will turn on a transistor which will draw additional current from the input terminal and cool down the transistor. This will cause the output voltage to rise and the transistor will turn off.The voltage regulator has a wide input voltage range that allows it to provide a steady 12V output while providing some degree of protection against over-voltage and short-circuit conditions.The device can also be used as an adjustable voltage regulator by connecting the ADJ pin to the output and ground pins of the voltage regulator. The ADJ can be adjusted using an external resistor to provide an adjustable output.

The L7812T is an efficient and reliable voltage regulator and can be easily incorporated into many different circuit designs and applications. With its wide input voltage range and adjustable output option, the device is suitable for a variety of applications in both commercial and industrial settings.It is a cost-effective solution for powering various devices or components with a steady and reliable voltage output.

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