L7809ABV

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L7809ABV Application Field and Working Principle

The L7809ABV is a Voltage Regulator IC from the popular Linear family. As with most of the devices in the Voltage Regulator category, the L7809ABV was designed to provide both a fixed and variable output regulatory function. It\'s commonly used to maintain the steady power of all kind of electronic devices like Arduino or Raspberry Pi.

Pin out, Equivalent and Package

The L7809ABV has a 9-pin package and its pin-outs are numbered 1 to 9 in order. Pin 1 to 8 are the input/output pins and pin 9 is the ground. Figure 1 shows the pinout assignment. The L7809ABV equivalent is a LM7809, and these are usually interchangeably used.

Features

The L7809ABV Voltage Regulator has a variety of applications, but is primarily designed for providing a fixed 9V DC output voltage. It also has the ability to provide an adjustable voltage between 5V to 18V. It has a maximum output current of 1.5A and 3A peak. The operating temperature range is from -40°C to +85°C, and it is equipped with a thermal protection shut off function.

Applications

The L7809ABV is used in a range of applications, such as powering micro controllers, lighting controls, small motors and power supplies. It is also used to provide regulated outputs for a variety of audio and video consoles, and is commonly seen in automotive electrical systems.

Working Principle

The L7809ABV is a three pin voltage regulator which is powered from an input voltage higher than the output voltage. This input voltage is then converted by the voltage regulator IC into a fixed or adjustable output voltage. The regulation is done by a voltage comparator and a voltage reference, with the voltage reference both controlling and monitoring the output voltage, ensuring it is always within the required range.

The L7809ABV Voltage regulator can work in two modes, Linear and switching. In Linear mode, the output voltage is regulated by varying the output current. Switching regulators offer higher efficiency, but their output voltage is not regulated and may depend on various parameters like load conditions and input voltage.

The L7809ABV also employs an internal thermal protection circuit that protects the device from overheating and thermal runaway. When the temperature of the device rises above the specified temperature limit, the thermal protection circuit senses the temperature and disconnects the output. This helps to protect the device from damage and provides extra safety against temperature related failure.

Conclusion

The L7809ABV is a three pin Voltage Regulator from the popular Linear family which is used to regulate the output voltage from a higher input voltage. It has a variety of applications, such as powering micro controllers, lighting controls, small motors and power supplies. It\'s equipped with a thermal protection shut off to help protect the device from damage and provides extra safety against temperature related failure.

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