DC-DC converter

A DC-DC converter comprising:

• a switch for receiving an input voltage and applying the input voltage or part of the input voltage to an inductor by an ON/OFF operation;
• a rectifier for rectifying a voltage generated in the inductor;
• a smoothing circuit for smoothing the rectified voltage to generate an output voltage;
• and
• a control circuit for generating a control signal for controlling the ON/OFF operation and outputting the control signal to the switch,
• wherein the control circuit includes
• an output detection circuit for outputting an error signal corresponding to a difference between the output voltage and a reference voltage,
• a current detection circuit for detecting a current flowing in the inductor in a period in which at least the switch is OFF and outputting a result of the detection as a current direction signal,
• a first circuit for generating a first signal for setting a timing of turning ON of the switch according to a result of comparison between the error signal and the current detection signal and outputting the first signal, and
• a second circuit for generating a second signal for setting an ON time of the switch, according to reduction in output power from the smoothing circuit, so that the ON time of the switch is reduced, and
• wherein the control circuit generates the control signal, based on the first signal and the second signal.