Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2006-11-28
2006-11-28
Patel, Rajnikant B. (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S224000, C363S065000, C307S066000
Reexamination Certificate
active
07141955
ABSTRACT:
A switching buck regulator circuit includes an n-type high-side switch. The driver of the high-side switch employs a boot voltage (Vcboot) as a power supply. Also, the output current is mirrored to a sense branch. A current sense voltage is generated employing a transistor in the sense branch. The current sense voltage is compared to a reference voltage that is generated employing another transistor having a gate that is coupled to the gate of the sense branch transistor. A diode (Dp) is coupled between the gate of the sense branch transistor and the input voltage (Vin). Another diode (Dc) is coupled between the gate of the sense branch transistor and Vcboot. When the high-side switch is off, the current sense voltage is clamped to substantially Vin−VDp−VTN2. When the high-side switch is on, the gate voltage of the high-side switch is substantially given by Vcboot−VDc.
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Darby & Darby PC
Gaffney Matthew M.
National Semiconductor Corporation
Patel Rajnikant B.
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