Programmable Shunt Regulator
Courtesy/Thanks to: Fairchild Semiconductor
Description: The TL431/TL431A are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any Value between VREF (approximately 2,5 volts) and 36 volts with two external resistors. These devices have a typical dynamic output impedance of 0.2W. Active output circuitry provides a very sharp turn-on characteristic, making these devices excel lent replacemnt for zener diodes in many applications.
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