LX8117B-25CST

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Voltage regulators are a type of power supply component that regulates an output voltage with respect to an input voltage. This makes voltage regulators a component of nearly all electrical and electronic systems, providing an efficient and reliable power source - the LX8117B-25CST is a popular example of this component, and is used in a variety of applications and environments. This article will provide a brief overview of the LX8117B-25CST and explain its working principle and application fields.

Introduction to the LX8117B-25CST
The LX8117B-25CST is a 3-Terminal, Adjustable Linear Voltage Regulator from Linear Technology. It offers over-voltage and under-voltage protection, easy external control, good thermal performance and excellent accuracy. The output voltage can be adjusted from 1.3V to 18V with resistance values from 1KΩ to 200KΩ. It also features an auto-stabilization circuit which compensates for line, load and temperature variations without external components. The device can operate at currents of up to 1.5A and its operating temperature range is between -40°C to +85°C.

Working Principle
The LX8117B-25CST follows a common linear voltage regulator working principle that can be summarised as follows:
The device uses a voltage reference, typically a Zener diode, connected in series with a diode and resistor. This is known as the reference circuit. The reference circuit provides a reference voltage and connects to the output terminal of the LX8117B-25CST. The output terminal is then connected to the input terminal through a control grid. The control grid adjusts the output voltage with respect to the input voltage.

The LX8117B-25CST also features an internal power FET, which helps to improve performance. This FET is responsible for controlling the current flow between the input and output terminals. The FET is also responsible for providing protection against over-voltage and under-voltage conditions.

Application Fields
The LX8117B-25CST is most commonly used to regulate voltage in applications such as PCs, laptops, tablets, mobile phones, industrial control systems, automotive electronics, household appliances, power supplies, and other portable electronics.

The LX8117B-25CST is suitable for a wide range of applications due to its high accuracy, good thermal performance, adjustable regulated output voltages, and wide range of operating temperatures. In particular, its auto-stabilization feature makes it suitable for use with noisy or varying input voltages.

The LX8117B-25CST is also a popular choice for ‘trickle-charging’ applications, in which a small amount of current is continuously supplied to a battery, preventing the battery from overcharging and maintaining optimal battery health. It is also used in motor applications, where its low output noise makes it suitable for controlling the speed and other parameters of the motor without interfering with its operation.

Furthermore, the device offers a good balance between cost and performance. It can also be used in configurations where the output voltage of the LX8117B-25CST is required to vary with changes in the input voltage. This makes the device an excellent option for use in portable power sources and battery charging scenarios.

Conclusion
The LX8117B-25CST is an adjustable linear voltage regulator from Linear Technology, offering excellent accuracy and thermal performance. It is suitable for a wide range of applications, from PCs and laptops to motor applications and trickle-charging scenarios. Thanks to its auto-stabilization feature, the device is suitable for use with noisy or varying input voltages, making it an excellent choice for portable devices and battery charging applications.

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