Patent ID: 7679295
Filing Date: 2010-03-16
Classification: G09G,H02M

Abstract:
1. A circuit for driving a load, comprising: a first ground plane; a second ground plane that is separate from the first ground plane, wherein the load is coupled to the second ground plane, and wherein the load includes at least one of a white LED string and a display; a sense resistor circuit that is coupled between an output voltage node and a feedback voltage node such that the sense resistor circuit is coupled in series with the load, wherein the sense resistor is arranged to receive an output voltage at the output voltage node, and to provide the feedback voltage based on a load current through the load such that the feedback voltage is referenced to the output voltage; a boost converter that is arranged to regulate the output voltage based on the feedback voltage, wherein the first ground plane is local to the boost converter; and a level-shift circuit that is arranged to provide a comparison signal from the feedback voltage such that the comparison signal is referenced to ground.