Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2006-12-05
2006-12-05
Riley, Shawn (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S224000, C323S283000
Reexamination Certificate
active
07145316
ABSTRACT:
A control circuit is incorporated in a switching regulator for monitoring and maintaining a bootstrap voltage to allow the switching regulator to operate at or near 100% duty cycle. The control circuit includes a circuit receiving the bootstrap voltage and generating a monitor voltage, a comparator circuit receiving the monitor voltage and a first voltage indicative of a switching output voltage and generating an output signal having a first state when the monitor voltage is equal to or less than the first voltage, a logic circuit receiving the output signal and generating drive control signals to driver circuits driving the high-side and low-side power switches. The logic circuit generates the drive control signals in response to the output signal of the comparator circuit having the first state to cause the high-side power switch to turn off and the low-side power switch to turn on, thereby recharging the bootstrap voltage.
REFERENCES:
patent: 5943227 (1999-08-01), Bryson et al.
patent: 7026801 (2006-04-01), Fowler et al.
Cook Carmen C.
Micrel Inc.
Patent Law Group LLP
Riley Shawn
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