RC1117ST

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Linear Voltage Regulators

Linear voltage regulators are electrical circuits used to maintain a stable output voltage by adjusting an output signal. This type of circuit allows a steady current or voltage to flow, despite changes in input voltage or current. Linear voltage regulators are powered by a power source such as a battery or a power supply, and they range from a wide variety of sizes and types. One example is the RC1117ST which is a linear voltage regulator.

RC1117ST Application Field

The RC1117ST is a three-terminal adjustable, linear regulator able to provide a power output of up to 1.5A. It has a wide input voltage range of 2.7 to 17V, making it suitable for a variety of applications, from battery supplies to other DC power supplies. It also has an output voltage range from 1.25V to 12V, which is helpful when the supply voltage must be changed in order to maintain the output voltage. Furthermore, its wide temperature range of -40 to 125°C allows for operation even in extreme temperatures.

RC1117ST Working Principle

The RC1117ST works by comparing the output voltage to an internal reference voltage and then adjusts the output voltage accordingly. The output voltage is adjusted by controlling the current drawn from the power source. This is done via a voltage divider system which is made up of two resistors. The resistors set the output voltage, while the regulator monitors the output current and adjusts the resistors to maintain the desired output voltage.

The RC1117ST also contains an error amplifier that compares the output voltage to the internal reference voltage. When the output voltage is lower than the reference voltage, the error amplifier increases the output current in order to raise the output voltage. Similarly, when the output voltage is higher than the reference voltage, the error amplifier decreases the output current to lower the output voltage. This is how the RC1117ST is able to maintain a constant output voltage despite any fluctuations in the supply voltage.

Conclusion

The RC1117ST is a popular three-terminal adjustable, linear regulator used for a wide variety of applications. This versatile device has an input voltage range of 2.7 to 17V and an output voltage range of 1.25 to 12V, making it suitable for a multitude of applications requiring an adjustable output voltage. Furthermore, its wide operating temperature range makes it ideal for operation in extreme temperatures. Finally, the error amplifier ensures that the output voltage is maintained, despite any fluctuations in the supply voltage.

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