Power output stage control method for vehicle fuel injection or ignition

摘要

The method involves controlling an integrated power output stage for switching of a load (L) connected in series with an output switch (T) of this stage and with the poles (+UB, GND) of a voltage source. A protection diode (D) may be connected with the load, and the load is controlled through control signals (st) from a control device (ST). A voltage (UA) at the connecting point (A) between load and output switch is compared with a predetermined threshold value (W) when switching off the load. A value is formed in response to the result of the comparison, and is stored during the operation of the stage. The output switch is controlled with predetermined, flat signal flanks, when the derived value is logical low, and with predetermined, steep signal flanks, when the derived value is logical high.