TL431ACDR2G

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Introduction

The TL431ACDR2G is a low-dropout, adjustable 3-terminal shunt voltage regulator developed by Texas Instruments (TI). Unlike other voltage regulators, which tend to have a fixed output voltage, the TL431ACDR2G allows the user to set the output voltage using an external divider from 1.24-36V. This makes it an ideal candidate for applications that required a variable or adjustable supply voltage.

Application Field

The TL431ACDR2G has a variety of applications, however it is primarily used as a low-dropout, adjustable voltage reference for precision monitoring, control and voltage regulation. Additionally, it can be used as a buffer, high-current switch, and constant current generator. Some of the most common applications include, but are not limited to, instrumentation and control currents supplies, precision audio amplifier against overloads, disconnecting phone lines, power supply sequencing and timing, high-brightness LED drivers, and many other types of power electronics.

Working Principle

The TL431ACDR2G is a shunt regulator, meaning the voltage across the device is regulated by altering the device current. This means that an external resistor is connected to the output in order to control the output voltage. When the output voltage rises above the TL431ACDR2G\'s reference voltage (Vref), the device will turn on a transistor, connecting the external resistor to ground and decreasing the output voltage. When the output voltage drops below Vref, the transistor will turn off and the output voltage will rise.

The TL431ACDR2G has an adjustable reference voltage (Vref) which allows the user to manually control the output voltage. This is accomplished by connecting an external resistor divider between the current source and Vref pins. This resistor divider sets the output voltage based on the ratio of resistance values chosen.

Conclusion

The TL431ACDR2G is a universal low-dropout, adjustable voltage reference. Its adjustable reference voltage allows for a wide range of applications, from precision monitoring and control to LED drivers. Its shunt regulator design means an external resistor must be used to set the output voltage, but this adds an extra layer of control for the user. Its broad variety of applications and adjustable output make it an ideal choice for precision control and power electronics.

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