Patent ID: 8796953

Claim:
A DC converter comprising: a frequency adjusting device comprising: a frequency selection circuit, comprising a first input that is supplied with a first threshold signal in dependence on a switching frequency signal of the DC converter, a second input that is supplied with a second threshold signal in dependence on the first threshold signal, a third input that is supplied with a ready signal of the DC converter, and an output, at which a control signal is provided that is designed for selecting a frequency of the switching frequency signal of the DC converter; a frequency change-over switch that is coupled to the output of the frequency selection circuit and that is supplied with a main clock signal of the DC converter, a first clock signal with a first clock frequency and at least one second clock signal with a second clock frequency, wherein said frequency change-over switch is designed for providing the switching frequency signal of the DC converter in dependence on the control signal, the first and/or the at least one second clock signal; a frequency generator that is supplied with the main clock signal and is designed for providing the first and at least the at least one second clock signal; a threshold signal generator that is supplied with the switching frequency signal of the DC converter and is adapted for respectively providing the first and the second threshold signal in dependence on the switching frequency signal; a state machine that is supplied with the ready signal and the switching frequency signal and is designed for providing a driving signal for the DC converter; and a unit for providing the ready signal in dependence on a first and a second voltage provided by the DC converter, wherein the control signal is provided in dependence on the first threshold signal, the second threshold signal and the ready signal, wherein the driving signal is provided in dependence on the switching frequency signal and the ready signal, and wherein the DC converter is designed for supplying a display device with organic light-emitting diodes or an active matrix display device with organic light-emitting diodes.