Patent ID: 7750615

Claim:
A converter comprising: a main switch; a power supply, configured to generate an output voltage by a switching operation of the main switch and by using an input voltage, and to transmit power to a load; a current sensor, configured to sense a current flowing to the main switch to generate a sense voltage; a burst mode controller, configured to control a burst mode group frequency by using a first voltage corresponding to a current transmitted to the load and a sawtooth waveform signal having a first frequency, wherein the burst mode controller is configured to determine a start and an end of a period for generating the switching operation according to the result of comparing the first voltage and the sawtooth waveform signal; and a PWM controller, configured to control the turn-on timing of the main switch, and to determine the turn-off of the main switch by using the first voltage and the sense voltage, thus controlling the switching operation of the main switch.