Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2008-01-01
2008-01-01
Berhane, Adolf (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S281000
Reexamination Certificate
active
07315154
ABSTRACT:
A voltage regulator has an output MOS transistor connected between a voltage source and an output terminal. A voltage dividing circuit is disposed between the output terminal and GND. An error amplifier receives a reference voltage from a reference voltage circuit and a division voltage from the voltage dividing circuit. A current limiting circuit is disposed between the voltage source and the output terminal. The current limiting circuit has a first MOS transistor connected to the voltage source. A current source circuit is disposed between the first MOS transistor and the output terminal. A resistor is connected to the voltage source. A second MOS transistor is controlled based on a current caused to flow through the first MOS transistor. A third MOS transistor is connected between the voltage source and an output terminal of the error amplifier and is controlled based on a current caused to flow through the resistor. When a current caused to flow through the first MOS transistor reaches a predetermined current, the current limiting circuit controls the output MOS transistor to limit a current outputted through the output terminal.
REFERENCES:
patent: 4008418 (1977-02-01), Murphy
patent: 6100749 (2000-08-01), Itoh
patent: 6522111 (2003-02-01), Zadeh et al.
patent: 6977491 (2005-12-01), Caldwell et al.
patent: 7015680 (2006-03-01), Moraveji et al.
patent: 7015745 (2006-03-01), Burinskiy et al.
Adams & Wilks
Berhane Adolf
Seiko Instruments Inc.
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