Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2008-01-22
2010-12-28
Patel, Rajnikant B (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S280000, C307S056000
Reexamination Certificate
active
07859240
ABSTRACT:
A circuit and method are provided for interrupting current flow into a voltage regulator from an output thereof when a voltage source (Vpwr) drops below an output voltage (Vout). In one embodiment, the circuit comprises: (i) a comparator supplied by Voutincluding an output and inputs coupled to Vpwrand Vout; and (ii) transistors coupled to and controlled by the comparator, including a first transistor configured to interrupt a first current path extending between Voutand Vpwrthrough an output-leg of the regulator when Vpwrdrops below Vout. Preferably, the regulator includes a reference-leg and a feedback-circuit coupling Voutthereto, and the first transistor also interrupts a second current path between Voutand Vpwrthrough the feedback-circuit and reference leg. More preferably, the reference-leg comprises resistors through which it is coupled to ground, and the transistors include a second transistor to interrupt a third current path between Voutand ground.
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Geynet Lionel
O'Sullivan Eugene
Cypress Semiconductor Corporation
Patel Rajnikant B
LandOfFree
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