2 the voltage on control terminal g of transistor tr 1 is at the end limited by operational amplifier op 1 serving as current limiter operating in adjustment in order to have the predetermined coil current i coil u2014 1 in fig8 b the limitation current is always reached as the amplitude of the trigger voltage v trigger varies as the amplitude of the signal v trigger varies the corresponding voltage v gate of the control terminal g of the transistor tr 1 reaches a value which is sufficient to let the collector current reach the limitation value this type of solution allows the device to reach the nominal current even in the worst case in order to always charge the coil in an optimal way and to have in the turn off step the convenient amount of energy available according to an embodiment of the present invention a control circuit is provided for power devices driven by input signals having at a high logic state a non optimal voltage value while there have been described above the principles of the present invention in conjunction with a preferred embodiment thereof it is to be clearly understood that the foregoing description is made only by way of example and not as a limitation to the scope of the invention particularly it is recognized that the teachings of the foregoing disclosure will suggest other modifications to those persons skilled in the relevant art such modifications may involve other features which are already known per se and which may be used instead of or in addition to features already described herein although claims have been formulated in this application to particular combinations of features it should be understood that the scope of the disclosure herein also includes.