AN78L05

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The AN78L05 is a three pin, positive voltage regulator manufactured by STMicroelectronics, and it can be used wherever a 2A voltage source is needed with an output voltage of 5V. It is part of STMicroelectronics\' L78L and S78L series of voltage regulators, which are designed specifically as linear voltage regulators with adjustable output voltage.

The AN78L05 is a three-terminal linear voltage regulator. Specifically, it is a three-pin regulator packaged in a TO220 package, and it is capable of providing a regulated output voltage of 5V at a current of up to 2A. The input voltage range is from 7V up to a maximum of 40V DC. This means that the AN78L05 can be used in devices that require a safe and regulated 5V output, such as in microcontrollers, motor control systems, and portable devices.

The AN78L05 has an internal current limit circuit and an in-built thermal shutdown feature, which makes it particularly useful in applications that require high reliability. When the current exceeds the limit, the voltage regulator will shut down, protecting the circuit from damage. This feature makes it highly reliable and able to cope with difficult situations.

The working principle of the AN78L05 Voltage Regulator is relatively simple. It is a three-terminal linear regulator, meaning that it requires three interdependent terminals: Input (Vin), Output (Vout) and Ground. The voltage regulator works by comparing the Supply Voltage to its reference voltage, which is typically set at 5V. If the input voltage rises above 5V, the voltage regulator will attempt to reduce the output voltage. Conversely, if the input voltage drops below 5V, the output voltage will be increased. This comparison process is carried out by the internal error amplifier of the voltage regulator, and it is also involved in the current limiting and thermal shutdown functions.

The AN78L05 is a popular choice for linear voltage regulator applications because of its excellent reliability, its small size, low cost and its wide output voltage range. Furthermore, it is well suited to many applications due to its wide input voltage range, temperature stability, and its ability to provide stable output in high current and temperature conditions.

In summary, the AN78L05 is a three-terminal linear voltage regulator, designed to provide a regulated 5V output voltage at up to 2A. It is a reliable, low-cost solution for many applications, and its wide input voltage range and temperature stability make it an excellent choice for many types of linear voltage regulator applications.

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