A power factor correction, PFC, circuit, which is operable in a discontinuous conduction mode, DCM, comprising: an inductor which is connected to a switch and which is configured to provide a discharge current (I L); a capacitor which is connected to the inductor via a diode and which can be charged with said discharge current (I L);and a control unit which is configured to alternately switch the switch on and off; in order to control a duty cycle for achieving a desired output voltage (Vout) of the PFC circuit in DCM, the control unit is configured to set a time duration of a cycle between two subsequent switch-on times of the switch as a product of a multiplier (k) with a time interval (t active), wherein the time interval (t active) ranges from a switch-on time (t on) of the switch to a time at which the discharge current (I L) reaches a zero-crossing; characterized in that the power factor correction circuit further comprises: a lookup table configured to store, for a limited number of predefined output load settings representing output voltages of the PFC circuit, a list of predefined multipliers (k) and associated values of a controller output signal; a digital controlled oscillator which is configured to receive the controller output signal and to perform, if the received value of the controller output signal lies between two values of the controller output signal that are stored in the lookup table, a dithering, according to a clock signal, of the two values of the controller output signal stored in the lookup table that are closest to the controller output signal received by the oscillator; wherein said lookup table is configured to output, for each value of the dithered controller output signal received from said digital controlled oscillator, an associated predefined multiplier (k), thereby outputing a dithered multiplier signal; wherein the control unit is configured to control the operation of the PFC circuit based on the dithered multiplier signal. an inductor which is connected to a switch and which is configured to provide a discharge current (I L); a capacitor which is connected to the inductor via a diode and which can be charged with said discharge current (I L);and a control unit which is configured to alternately switch the switch on and off; in order to control a duty cycle for achieving a desired output voltage (Vout) of the PFC circuit in DCM, the control unit is configured to set a time duration of a cycle between two subsequent switch-on times of the switch as a product of a multiplier (k) with a time interval (t active), wherein the time interval (t active) ranges from a switch-on time (t on) of the switch to a time at which the discharge current (I L) reaches a zero-crossing; characterized in that the power factor correction circuit further comprises: a lookup table configured to store, for a limited number of predefined output load settings representing output voltages of the PFC circuit, a list of predefined multipliers (k) and associated values of a controller output signal; a digital controlled oscillator which is configured to receive the controller output signal and to perform, if the received value of the controller output signal lies between two values of the controller output signal that are stored in the lookup table, a dithering, according to a clock signal, of the two values of the controller output signal stored in the lookup table that are closest to the controller output signal received by the oscillator; wherein said lookup table is configured to output, for each value of the dithered controller output signal received from said digital controlled oscillator, an associated predefined multiplier (k), thereby outputing a dithered multiplier signal; wherein the control unit is configured to control the operation of the PFC circuit based on the dithered multiplier signal. a lookup table configured to store, for a limited number of predefined output load settings representing output voltages of the PFC circuit, a list of predefined multipliers (k) and associated values of a controller output signal; a digital controlled oscillator which is configured to receive the controller output signal and to perform, if the received value of the controller output signal lies between two values of the controller output signal that are stored in the lookup table, a dithering, according to a clock signal, of the two values of the controller output signal stored in the lookup table that are closest to the controller output signal received by the oscillator; wherein said lookup table is configured to output, for each value of the dithered controller output signal received from said digital controlled oscillator, an associated predefined multiplier (k), thereby outputing a dithered multiplier signal; wherein the control unit is configured to control the operation of the PFC circuit based on the dithered multiplier signal.