Semiconductor device and switching power supply apparatus
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United States of America Patent
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Dec 25, 2012
Grant Date -
Dec 16, 2010
app pub date -
Mar 18, 2010
filing date -
Jun 11, 2009
priority date (Note) -
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Abstract
A switching power supply apparatus includes: a turn-on control circuit which generates a turn-on signal; a feedback control circuit which generates a reference voltage VEAO indicating a limitation level for a current ID flowing into a switching element, by referring to a feedback signal IFB indicating an output current voltage VOUT, the limitation level which decreases as the output direct current voltage becomes greater; an overcurrent protection level setting circuit which generates a reference voltage VLR indicating an overcurrent protection level; a current detecting terminal; an offset current generating circuit which provides an offset current IIS from the current detecting terminal, the offset current IIS which is greater as the output current voltage VOUT is greater; and a turn-off control circuit which generates a turn-off signal by comparing a voltage applied to the current detecting terminal with each of the reference voltage VEAO, and the reference voltage VLR.
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