Patent ID: 7345513

Claim:
A driver circuit, which in an operating mode drives a component that only supplies output power when a driving input signal exceeds a first threshold value, the driver circuit comprising: a differential amplifier whose output signal controls the driving input signal; a reference signal generator that supplies a reference signal to a reference input of the differential amplifier; an external feedback that applies a signal, which is dependent on the output signal, to a feedback input of the differential amplifier; an adapter circuit; and an internal feedback that is activated in a compensation mode as an alternative to the external feedback, which internal feedback provides a signal to both the feedback input and the adapter circuit even when the driving input signal does not exceed the first threshold, value wherein the adaptor circuit generates from the signal, and stores, a compensation signal that compensates an offset signal acting alone at the reference input when the reference signal generator is switched off, and wherein the adaptor circuit feeds the stored compensation signal, together with the reference signal provided by the reference signal generator, to the reference input or the feedback input when the external feedback is activated.