Power supply circuit capable of reducing the number of external components
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United States of America Patent
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Dec 1, 2009
Grant Date -
Oct 11, 2007
app pub date -
Apr 9, 2007
filing date -
Apr 11, 2006
priority date (Note) -
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Abstract
An inverting negative voltage DC-DC power supply circuit comprises a first resistor having one end connected to an output terminal for converting a change in output voltage into a current. A zero-volt clamp circuit is connected to the other end of the first resistor and comprises a first and second transistor. A current mirror circuit comprises a third and fourth transistor and is connected to the zero-volt clamp circuit for causing a current of the same value as that of a current flowing in the zero-volt clamp circuit to flow. A second resistor is connected to the current mirror circuit for converting a change in current flowing from the zero-volt clamp circuit into a voltage.
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