The typical application circuit of TL431 mainly includes constant voltage circuit, constant current circuit, controllable shunt circuit and its application in switching power supply design
TL431 is a controllable precision voltage regulator. Its output voltage can be arbitrarily set to any value from Vref (2.5V) to 36V with two resistors. The typical dynamic impedance of this device is 0.2Ω, and it is used in many applications instead of voltage regulator diodes, such as digital voltmeters, op-amp circuits, adjustable voltage power supplies, switching power supplies, etc.
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