Power transistor circuit device with control circuit for power transistor provided with current source device providing current dependent on variation in potential supplied to power transistor

摘要

The circuit device has a power transistor (T) connected via an inductive line (L) with a supply potential terminal (V1) at one side and to a load (Z) at the opposite side, a control circuit (10) connected to the transistor control terminal (G) having a first current source device (Iq1), connected between the control circuit output and the supply potential terminal and a second current source device (S2off,Iq2), connected to the control circuit output for providing a current (I2) dependent on the time variation of the potential on the first side of the power transistor.