Adaptive driver for a transistor

It is a driver unit (220) described for controlling a semiconductor switch (100). The switch (100) has a first port and a second port, which can be through the switch (100) periodically in response to a control signal (115) at a control port of the switch (100) or separately. The driver unit (220) is established, a flow measurement signal (111) with respect to. A current between the first and to determine the second port of the switch (100). The driver unit (220) is further arranged a temperature measurement signal (113) with respect to. A temperature to determine the switch (100) and in dependence on the temperature measurement signal, a maximum blocking voltage (311) of the switch (100) to investigate. In addition, the driver unit (220) is adapted, based on the maximum reverse voltage (311) based on the current measurement signal (111) and based on a switching speed (213) of the switch (100) to determine a control error (312). Furthermore, the driver unit (220), the switching speed is established (213) of the switch (100) by a controller (304) to adapt in response to the control error (312).