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SiC Schottky Diode Design

Building a diode with a pure Schottky junction has the advantage of the lowest possible forward voltage, but has some problems at high currents like the surge currents that are common in a PFC application. For example, during voltage surges in the line at startup, short overcurrents that could damage the SiC pure Schottky diode are quite common. PFC is a direct converter and any overstress in the input can arrive at the output through the diode, creating dangerous overstress. Vishay solves this problem by implementing a special MPS structure that keeps the forward voltage under control during high current events, providing a high surge current capability for a 10 ms sinusoidal pulse and increasing diode reliability when current through the diode has a high crest factor.

PTM Published on: 2021-04-09