Sanken Electric Co., Ltd.

Sanken Electric Korea Co., Ltd.

Jungyul Kim

Masaaki Shimada

Shinji Aso

Mitsutomo Yoshinaga

Eunsuk Lee

Hanju Kang

A detector compares a drain voltage with a first threshold voltage and outputs a first detection signal. An ON counter detects a period of time during which a current flows in a switching, counts the period of time based on a predetermined clock cycle. An OFF counter detects a period of time during which a current flow through the body diode in a state where no current flows in the switching circuit, counts the period of time. An off-time setting circuit sets the time to turn off the switching circuit. A first comparison circuit compares the cycle count value with turn off time. A second comparison circuit compares a cycle count value output by the ON counter with a comparison result output by the first comparison circuit and outputs a signal to stop transmitting a PWM signal.

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Seoul, South Korea

Jungyul Kim