Patent ID: 8115466

Claim:
A converter that operates in burst mode according to a load, the converter comprising: a square wave generator with at least one switch, configured to convert an input signal to a square wave signal; a voltage supply unit configured to receive the square wave signal and to generate an output voltage to be provided to the load; and a switch controller configured to generate a first signal having a first period that varies according to the output voltage, to control a switching operation of the switch by using the first signal, to detect the output voltage, a first current flowing through the switch, and a level of the first signal, and to control a burst mode according to the detected voltage, wherein the switch controller comprises: a pulse width modulation (PWM) oscillator configured to generate a variable current corresponding to the output voltage, to generate the first signal by using the variable current, and to generate first and second oscillator signals having a period that is the same as that of the first signal; a burst mode controller configured to receive the first signal, the second oscillator signal, a detection signal corresponding to the first current, and a second current corresponding to the variable current, and to control start and finish of the burst mode; and a PWM controller configured to control the switching operation of the switch according to the first oscillator signal, and to stop the switching operation of the switch during the burst mode.