TL431ILPRM

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TL431ILPRM is a shunt voltage regulator. The TL431 family of SOT-23 components is a three-terminal adjustable voltage reference integrated circuit that has an output voltage that can be adjusted over a wide range. This family of products is designed to provide exceptional accuracy and stability and wide bandwidth performance. In operation, this device also features high precision and low DC drift. This article will discuss the application field and working principle of TL431ILPRM.

Overall, the TL431ILPRM family of devices is designed to serve as a precision shunt voltage regulator with the ability to adjust the reference voltage from 2.500V to 36V. As such, it can be used to control the voltage in circuits such as DC/DC converters, linear regulators, and other precision circuits. It is also suitable for a variety of telecom and computing devices, as well as automotive infotainment systems and digital/analog devices.

The device is available in four configurations, with fixed and adjustable output voltages and fixed and adjustable current limits. The fixed output voltage devices offer very accurate voltage regulation (typically 0.2% over temperature) while the adjustable output voltage devices offer fine-tuning options and higher reliability. In addition, the adjustable current limit devices offer flexibility in controlling the load current.

The output voltage of the TL431ILPRM is adjusted via a resistor divider connected to the VADJ pin, while the current limit is adjusted via the ILIM pin. Upon application of the correct logic signal, the device turns on and regulates the output voltage to the setting of the resistor divider or to the setting of the current limit. The device is protected from overvoltage, overcurrent and reverse voltage. It also has a built-in thermal shutdown feature for protection against overload.

Internally, the TL431ILPRM is a biased current source in a feedback loop. The feedback loop is closed by an internal comparator, which compares a reference voltage to the voltage at the ADJ pin. If the voltage at the ADJ pin is above the reference voltage, the comparator outputs a signal that causes the current source to drop, thus reducing the output voltage. Conversely, if the voltage at the ADJ pin is below the reference voltage, the comparator increases the current source, which increases the output voltage.

In summary, the TL431ILPRM is a three-terminal adjustable voltage reference integrated circuit that can be used to control the voltage in DC/DC converters, linear regulators, precision circuits, and other applications. It offers very accurate voltage regulation, adjustable output voltage and adjustable current limit. The device is housed in a SOT-23 package and is protected from overvoltage, overcurrent and reverse voltage. Internally, it is a biased current source in a feedback loop controlled by an internal comparator.

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