Patent ID: 6683441
Filing Date: 2004-01-27
Classification: H02M

Abstract:
A total current circuit for an N-phase switching regulator which provides an output voltage Vout at an output terminal and which includes N output inductors carrying respective phase currents which are summed together to provide a total instantaneous inductor output current Iout to a load connected to said output terminal, said total current circuit comprising:N current sensing elements which carry respective ones of said phase currents, each of said elements having a switch node side and an output side, said elements' output sides connected to said regulator's output terminal, a summing circuit which sums the voltages present at the switch node sides of said sensing elements and provides said summed voltages at a summing node, and an amplifier circuit which is connected to said summing node at a first input and to said output terminal at a second input and is arranged to produce an output voltage Vcs which is proportional to Iout.