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paralleling-slide5

This slide shows the turn-off switching event: externally induced by the opposite switch, dv/dts can induce a current into the gate circuit by way of the miller capacitance. Immunity to false turn-on requires a low gate driver off-state impedance. This is the opposite to the on-state requirement. Gate circuit elements can ring sufficiently to turn on the switch causing a shoot-through condition. The lowest possible gate loop inductances are needed. This makes it easier to damp ringing and maintains high switching speed capabilities.

PTM Published on: 2012-04-26