| 摘要 |
A semiconductor device ( 51 ) for controlling a switching power supply, includes a switching element ( 1 ) and a switching control circuit. During an intermittent switching operation of the switching element ( 1 ), when a return signal is outputted from a light load detection circuit ( 32 ) before the counting of a counter circuit ( 14 ), the switching operation of the switching element ( 1 ) is restarted at the timing of a transformer reset signal from a transformer reset detection circuit ( 13 ) after the return signal is outputted. When the return signal is outputted from the light load detection circuit ( 32 ) after the counting of the counter circuit ( 14 ), the switching operation of the switching element ( 1 ) is restarted, regardless of the transformer reset signal, only when the return signal is outputted.
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