Circuit for cutting-off output signal
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United States of America Patent
Stats
-
Nov 13, 2007
Grant Date -
Jul 27, 2006
app pub date -
Dec 8, 2005
filing date -
Jan 27, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An output signal cutting-off circuit includes a first switching element, a driving circuit and a voltage-drop-signal generating circuit. When a voltage to be monitored becomes lower than a threshold voltage, a voltage-drop-signal is generated and supplied to the driving circuit. The driving circuit turns on the first switching element based on the voltage-drop-signal to thereby cut off an output signal voltage by bringing it to a ground potential. When the voltage-drop-signal disappears, the first switching element is turned off to bring the output signal to a normal state. Preferably, a second switching element for charging a capacitor and a third switching element for discharging the capacitor are used in the driving circuit. In this case, the first switching element is turned on or off based on a voltage of the capacitor.
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