Semiconductor device for controlling switching power supply
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United States of America Patent
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Apr 24, 2007
Grant Date -
Oct 6, 2005
app pub date -
Mar 25, 2005
filing date -
Mar 31, 2004
priority date (Note) -
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Abstract
In a semiconductor device for controlling switching power supply of this invention, having a switching element and switching operation control circuit, after receiving a current detection signal when switching is turned off, a fixed delay time is applied to the current detection signal by a delay circuit so that switching turn-on control by a transformer reset pulse signal obtained based on a signal from the tertiary windings of the transformer is not accepted within a blanking time corresponding to the delay time. Thus, the switching by the switching element is halted.
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