TL431CDR2G

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The TL431CDR2G belongs to the PMIC – Voltage Reference category. The component is a 2.5V shunt 3-Terminal Adjustable Regulator with a wide input voltage range from 2.3 to 40V. It also has a low temperature coefficient, short-circuit current limiting, and thermal overload protection features.

The device can be used in an adjustable precision current-limiting circuit. It acts as a shunt regulator in the feedback loop to establish the output voltage by controlling the load current. Its voltage range allows it to be used in high voltage power supplies, battery chargers, and buck converters. It can also be used in current sensing and temperature sensing circuits.

The TL431/TL432 family offers adjustable output voltage options up to 36V and fixed voltage options from 1.2 to 24V. They have excellent line and load regulation characteristics, wide input voltage range, low output noise, fast transient response, and low temperature coefficient. Additionally, the current-limiting circuit built into the device provides improved thermal stability.

On a functional level, the TL431CDR2G works by comparing the reference voltage (2.5V) of the internal voltage regulator to the voltage at the cathode. If the cathode voltage is higher, the voltage regulator will reduce the current supplied to the cathode. Conversely, if the cathode voltage is lower, the regulator will increase the current supplied to the cathode. This process continues until the reference voltage and the cathode voltage are equal, at which point the output voltage is established.

The TL431CDR2G is also designed to protect against undervoltage and overvoltage conditions. If the output voltage drops below its nominal voltage, the device’s current-limiting feature activates to reduce the current supplied to the cathode. Similarly, if the output voltage exceeds the nominal voltage, the regulator will reduce the current. This protective function is especially useful for applications like battery chargers or high voltage power supplies.

In summary, the TL431CDR2G is a 3-Terminal Adjustable Regulator with a wide input voltage range that can be used in high voltage power supplies, battery chargers, and buck converters. It works as a shunt regulator in the feedback loop to establish the output voltage and carries features like short-circuit current limiting, thermal overload protection, and undervoltage and overvoltage protection. Its wide input voltage range and excellent line and load regulation characteristics make it suitable for even the most demanding applications.

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