06246220 is referenced by 78 patents and cites 2 patents.

A DC to DC buck pulse width modulator converter circuit includes an input, a high side output and a low side output. A high side switch is electrically connected between a common output node and a voltage supply, and controls a flow of current therethrough dependent upon the high side output. A low side switch is electrically connected between the common output node and ground, and controls a flow of current therethrough dependent upon the low side output. A virtual ground amplifier includes a second input electrically connected to ground. A current feedback resistor is electrically connected intermediate the common output node and a first input of the virtual ground amplifier. A variable impedance component is electrically connected to an output of the virtual ground amplifier and to the first input of the virtual ground amplifier. The impedance of the variable impedance component is varied dependent upon the output of the virtual ground amplifier. A sample and hold circuit is electrically connected intermediate the input of the pulse width modulator converter circuit and the variable impedance component. The sample and hold circuit sources a virtual ground current through the variable impedance component, and samples the virtual ground current.

Title
Synchronous-rectified DC to DC converter with improved current sensing
Application Number
9/633316
Publication Number
6246220 (B1)
Application Date
August 7, 2000
Publication Date
June 12, 2001
Inventor
Michael M Walters
Apex
NC, US
Charles E Hawkes
Cary
NC, US
Robert H Isham
Flemington
NJ, US
Agent
Jaeckle Fleischmann & Mugel
US
Assignee
Intersil Corporation
FL, US
IPC
G05F 1/613
View Original Source