Transient substrate currents in junction-isolated lateral IGBT

In this brief, experimental results of transient substrate currents that occur during clamped inductive switching of a junction-isolated lateral insulated gate bipolar transistor are analyzed. The transient substrate current peak at turn off is broader and higher than the value at turn on. The peak substrate current increases with increasing anode voltage, and anode injection efficiency significantly influences the characteristics of the transient currents. Two-dimensional numerical simulations are used to evaluate the internal dynamics of the device. It is shown that the Kirk effect is responsible for the transient currents during the switching of a lateral insulated gate bipolar transistor.

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