TL431FDT,215

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PMIC or Power ManagementIC is widely used in a variety of applications that requires precise voltage or current regulation. Among various types of PMIC, Voltage reference devices are widely used for voltage regulation, such as the TL431FDT,215. Learning the application field and working principle of this Voltage reference device is crucial for the application design.

Applications Field

The TL431FDT,215 is an adjustable precision zener shunt regulator, featuring a broad base of features and specifications that make it a good choice for applications such as standalone battery-powered systems and laser power supplies, as well as DC/DC converters and power supplies in telecom, networking and other systems needing robust output voltage control. TL431FDT,215 has high accuracy voltage with enabling features such as overvoltage, overtemperature and over current protection, quicker response time due to its hysteresis control, and much more. Its fast installation time, low droop and improved accuracy make it a good choice for energy hungry devices available in adjustable, fixed, and power series. With wide operating temperature range, the device ensures maximum compatibility and robustness.

Working Principle

A TL431FDT,215 is an adjustable precision Zener shunt regulator. The device works as a voltage regulator, which functions as a precision low-side current sense, when an external PNP resistor is connected to the TL431FDT,215. The device regulates the output voltage with a precision zener reference diode over the entire operating ranges. This feature allows to set the voltage quite precisely and also helps to prevent over voltage.

The TL431FDT,215 consists of an internal precision band-gap reference, an error amplifier, a stable current source, an output driver, and two voltage comparators. It can be used to provide a 5mA reference current for power supply design, with an output voltage range from 2.5V to 10V. It also has two comparator inputs to detect over temperature and over-voltage protection. This protection makes it ideal for applications in high reliability environments.

The TL431FDT,215 device is designed in such a way that a change in the output voltage will cause the current to vary in the same direction. The device works by computing the internal feedback and setting the output voltage in order to keep this current constant. It will adjust the output voltage to maintain a constant current in the load so that the load operates with maximum efficiency. The accuracy of the TL431FDT,215 is usually within +/- 0.1%.

Conclusion

TL431FDT,215 is an adjustable voltage reference with wide applications field, such as standalone battery-powered systems, laser power supplies, DC/DC converters and power supplies in telecom, networking and other systems. It functions as a precision low-side current sense, with accurate output voltage from 2.5V to 10V and fast response time because of its hysteresis control feature. It features overvoltage, overtemperature and over current protection, as well as high reliability for its wide temperature matching range. The accuracy of the TL431FDT,215 is usually within +/- 0.1%.

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