Use a TL431 shunt regulator to limit high ac input voltage

Arsenov, Todor
October 2007
EDN;10/25/2007, Vol. 52 Issue 22, p69
Trade Publication
The article explores the use of TL431 shunt regulator to limit high alternating current (AC) input voltage. Using input-limiting circuits enables the user to increase the input voltage to 440V root-mean-square (rms) without affecting the power supply components. A diagram is presented that shows a circuit that limits or clamps, input-AC voltages higher than 260V rms to levels safe for the operation of the power metal-oxide semiconductor field-effect transistor (MOSFET) in a switched mode power supply (SMPS).


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