Patent ID: 7327129
Filing Date: 2008-02-05
Classification: H02M,Y10S

Abstract:
1. A current sense circuit for a DC-to-DC converter having a controller for switching a high side switch and a low side switch connected to each other by a phase node to generate an output current, the current sense circuit comprising: a first transconductive amplifier responsive to the output current for generating a first current for the controller to switch the high side and low side switches; a second transconductive amplifier for generating a second current from a first voltage; variable resistor for adjustably generating a second voltage from the second current; and a bias apparatus for generating a bias signal from a difference between the second voltage and a third voltage to adjust a first transconductance of the first transconductive amplifier and a second transconductance of the second transconductive amplifier, whereby the first and second transconductances are adaptively adjusted in value responsive to variation of the variable resistor.