Patent ID: 7759919

Claim:
A switching converter for generating an output voltage from an input voltage, comprising: a control arrangement configured to generate a control signal dependent on the output voltage, a first converter stage and at least a second converter stage, each of which including an inductive storage element, a current measurement arrangement which is designed to detect a current across the inductive storage element and to furnish a current measuring signal proportional to this current, a pulse width modulator configured to receive the control signal and the current measuring signal and to generate a pulse width modulated signal, and a driver circuit which receives the pulse width modulated signal and the input voltage and which applies the input voltage to the inductive storage element in dependence on the pulse width modulated signal, wherein the current measurement arrangement of the second converter stage is configured to adjust a proportionality factor between the current across the inductive storage element and the current measurement signal thereof, responsive to an adjustment signal that is dependent on a proportionality factor between a current across the inductive storage element of the first converter stage and the current measuring signal of the first converter stage; and a calibration circuit adapted to provide the adjustment signal for the at least one switching converter during ongoing operations of the switching converter, and adapted to generate the adjustment signal during a calibration step at startup of the switching converter.