TL431BVDG

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The TL431BVDG device is a three-terminal adjustable precision shunt regulator that is widely used in a variety of applications in power management, linear and switching regulators. The device consists of a bandgap reference, a current source, an error comparator and series pass element in which all blocks are integrated with one another on a same chip. The device operates from a wide voltage range of 2.5V up to 36V and has excellent temperature stabilization characteristics. It can be used to provide both the reference voltage and the current limit functions in the design of linear and switching regulator circuits.

As part of the PMIC - Voltage Reference family, the TL431BVDG delivers an adjustable output voltage using an external resistor divider. The output voltage is precisely regulated over a wide temperature range and is relatively independent of load and power supply voltage variations. It is ideal for applications that require accurate voltage reference sources and in voltage sensing circuits. The device also provides excellent noise rejection due to its CMOS technology-based construction.

The TL431BVDG device works by continuously comparing the voltage at its reference pin to an internal 2.495V reference. Whenever the voltage at the reference pin exceeds 2.495V, an internal error comparator drives the gate of the series pass element to reduce the voltage at the reference pin. It also drives an N-channel MOSFET that functions as a current supply to the reference pin, thus limiting its voltage rise. When the voltage at the reference pin drops below the internal reference, the error comparator opens the MOSFET, thereby reducing the current supplied to the reference pin. In this way, the output voltage is regulated to the target set by the resistor divider.

The most interesting feature of the TL431BVDG device is its temperature stability. The device is designed to keep the temperature variation of the output voltage within a very tight tolerance range. By using a special temperature compensation circuit, the device can maintain a very accurate reference voltage regardless of ambient temperature. Additionally, the device provides an adjustable current limit function, which can be adjusted by varying the feedback resistor and can be used to limit fault currents.

The applications of the TL431BVDG device range from simple voltage reference circuits, to large-scale linear and switchmode regulation systems. Its most useful application lies in power management, where the device is used to sense the voltage levels and prevent over-voltage and over-current conditions. Additionally, the device can be used in a variety of signal conditioning systems and as a general-purpose voltage monitoring unit.

In conclusion, the TL431BVDG device is an essential element in PMIC - Voltage Reference applications. It provides an adjustable reference voltage and excellent temperature stability, along with adjustable current limit, useful in power management and signal conditioning applications. It is an ideal solution for accurate voltage reference sources and voltage sensing circuits.

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