L9758TR

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PMIC - Voltage Regulators - Special Purpose

Voltage regulators are used to control the output voltage of a power supply. The L9758TR is a special purpose voltage regulator capable of controlling the output voltage of a system with moderate accuracy. It is commonly used in a number of applications ranging from automotive to communication equipment. In this article, we will discuss the application field and working principle of the L9758TR.

Application Field

The L9758TR is usually found in automotive, communications, industrial, and military applications. Its main function is to provide a constant output voltage despite the fluctuations of the input supply. It provides the user with the ability to adjust the output voltage of the power supply as well as provide protection against overloads and short circuits. The output voltage of the regulator can be adjusted by simply connecting a pair of external resistors to it. This makes it ideal for applications that require precision control over their power supplies.

The L9758TR has a wide range of operating temperatures, from -40 to 125 degrees Celsius, and can withstand high input voltages of up to 80V. This makes it suitable for a variety of applications, including industrial, communications, and medical equipment. It is also used in motor control applications, such as pumps and regulators.

Working Principle

The L9758TR uses a three-terminal adjustable voltage regulator. This regulator consists of two transistors, an adjustment terminal, and a voltage divider. The adjustment terminal is used to control the output voltage of the regulator by adjusting the amount of current flowing through the voltage divider. The voltage divider is composed of two resistors which are connected in series. The output voltage of the regulator is determined by the resistances of the two resistors. By adjusting the ratio of the resistances, the output voltage can be adjusted.

The operation of the regulator is such that when the input voltage rises, the transistor connected to the adjustment terminal is switched on, pulling the output voltage down and reducing the output current of the regulator. When the input voltage decreases, the same transistor is switched off, allowing the output voltage to rise and the output current to increase. This mechanism allows for precise control of the output voltage of the regulator.

In addition to controlling the output voltage, the L9758TR also offers protection from overloads and short circuits. This protection is provided by the current-limiting circuit which is built into the regulator. When the output current exceeds a certain limit, the current-limiting circuit reduces the output voltage and limits the maximum current that can flow through the regulator. This ensures that the regulator does not suffer damage due to excessive current.

The L9758TR is an ideal voltage regulator for applications that require precision control of the output voltage. It is robust, reliable, and offers a wide range of operating temperatures and input voltages. It is also capable of providing protection against overloads and short circuits, making it suitable for a wide range of applications.

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