Influence of parasitic inductances on transient current sharing in parallel connected synchronous rectifiers and Schottky-barrier diodes

The transient current sharing in parallel connected Schottky-barrier diodes and MOSFET synchronous rectifiers is analysed. It is shown that, because of parasitic inductances the desired reduction of dead-time conducting losses and reverse-recovery peak current is limited, when discrete devices are used. The total amount of conducting losses in the free-wheeling circuit can increase. A reduction of switching losses in half-bridge configurations is possible because of secondary effects.