Fairchild Korea Semiconductor Ltd.

Gyoung-Soo Park

Jin-Tae Kim

Gwan-Bon Koo

Hyun-Chul Eom

Kyung-Oun Jang

Shanmei Li

Hyeong-Seok Baek

Se-Hwan Kim

The present invention relates to a switching mode power supply and a driving method thereof. In the present invention, a supply voltage is generated by using a start voltage that corresponds to input power, and a switching operation frequency of a power switch is changed according to an increase/decrease of the supply voltage.

Switching mode power supply with variable switching operation frequency and the driving method thereof

The present invention relates to a switch controller and a converter including the same. The switch controller generates an oscillating voltage determining a switching frequency alternately switching a high-side switch and a low-side switch, senses a power source voltage supplied to the switch controller, and maintains the high-side switch and the low-side switch in the turn-off state in a case that the change of the power source voltage is not generated after one of the high-side switch and the low-side switch is turned off according to the oscillating voltage.

Switch controller and converter including the same

A converter is provided including: a first switch; an energy transmitting element for converting input energy into output energy according to the switching of the first switch; and a switching controller for detecting a time when a voltage between a first terminal and a second terminal of the first switch reaches a valley of a resonance waveform, and actuating the first switch corresponding to one of the detected valleys of the resonance waveform. The switching controller includes: a valley detector for changing the state of the output signal whenever a voltage between a first terminal and a second terminal of the first switch reaches a valley of the resonance waveform; and a PWM controller for actuating the first switch corresponding to an output signal of the valley detector.

Converter that actuates a switch corresponding to a detected valley of a resonance waveform

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Seoul, South Korea

Gyoung-Soo Park