Patent ID: 7741825

Claim:
A power supply circuit comprising: a load current path configured for connection to a load, the load current path including a switching element; a current sensor configured to provide a current measurement signal dependent on a load current through the load current path; a temperature sensor arrangement including a temperature sensor configured to determine an environmental temperature in the area of the temperature sensor, the temperature sensor arrangement configured to provide a temperature measurement signal dependent on the environmental temperature; and a drive circuit configured to provide a clocked drive signal with a plurality of drive cycles for the switching element, each of the plurality of drive cycles including an on period and an off period, the clocked drive signal being dependent on the current measurement signal and the temperature measurement signal, wherein the drive signal is dependent on the temperature measurement signal and the current measurement signal such that the load current increases with a rising temperature until a threshold value is reached and the load current decreases after this threshold value has been reached.