Switching control circuit
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United States of America Patent
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May 19, 2009
Grant Date -
Jul 3, 2008
app pub date -
Dec 18, 2007
filing date -
Dec 27, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A switching control circuit, controlling a transistor, of a voltage generating circuit generating an output voltage of a target level from an input voltage applied to the transistor, comprising: an error amplifier circuit outputting an error voltage obtained by amplifying an error between a voltage according to the output voltage and a first reference voltage; a first comparison circuit comparing the error voltage with a second reference voltage to output a first control voltage; a second comparison circuit comparing the error voltage with a third reference voltage to output first and second voltages a charging and discharging circuit for charging and discharging a capacitor based on the first and second voltages; a third comparison circuit comparing a charged voltage of the capacitor with a fourth reference voltage; and a control circuit outputting a second control voltage for turning off the transistor according to a result of the third comparison circuit.
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