Transient interference refers to transient interference signals such as surge voltage, ringing voltage, spark discharge, etc. appearing on the AC grid. It is characterized by extremely short operating time, but high voltage amplitude and large transient energy. Transient interference can cause fluctuations in the output voltage of a single switching power supply; when the transient voltage is superimposed on the rectified and filtered DC input voltage VI, so that VI exceeds the drain-source breakdown voltage V(BR)DS of the internal power switch It also damages the TOPSwitch chip, so suppression must be used.
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