Technical summary
The TL431 is a 3-pin shunt regulator whose temperature stability makes it suitable for embedded and military applications. The output voltage can be adjusted between Vref (2.50V) and 36V with only 2 external resistors. The typical output impedance is 0.2 Ohm. The TL431 is an advantageous replacement for the Zener diode in regulated and switching power supplies.
