07372241 is referenced by 21 patents and cites 12 patents.

A regulator is provided. The regulator includes a main switch, a synchronous switch, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the synchronous switch is sensed by the current sense amplifier. Also, a current sense voltage provided by the current sense amplifier is sampled when the synchronous switch is on, and held when the synchronous switch is off. The ramp generator is arranged to generate a voltage ramp that emulates the slope of the inductor current while the synchronous switch is open. Additionally, the sampled synchronous switch current is combined with the voltage ramp. The PWM comparator is arranged to provide a PWM signal by comparing the voltage ramp to a comparison signal provided by the error amplifier.

Title
Apparatus and method for switching voltage regulation
Application Number
11/467529
Publication Number
7372241 (B1)
Application Date
August 25, 2006
Publication Date
May 13, 2008
Inventor
Kenji Tomiyoshi
Chiba
JP
Agent
Matthew M Gaffney
Darby and Darby PC
Assignee
National Semiconductor Corporation
CA, US
IPC
G05F 1/56
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