Patent ID: 7936540

Claim:
A power converter having a plurality of channels, the power converter comprising: a set resistor having a resistance R set ; and for each of the plurality of channels: an error amplifier configured to compare a reference voltage to a regulated output voltage; a pulse width modulator coupled to the error amplifier and configured to modify the regulated output voltage based on the comparison in the error amplifier; and a current sensing element coupled to the pulse width modulator and configured to sense a first current; a sense resistor having a resistance R sense , the sense resistor coupled to the current sensing element such that the first sensed current flows through the sense resistor; a reference resistor having a resistance R reference which is a fixed multiple of R sense ; and circuitry coupled to the set resistor, the reference resistor and the sense resistor, the circuitry configured to produce an output current having a value that is proportional to R set and a fixed ratio between R sense and R reference , wherein the circuitry is coupled to the error amplifier to provide the output current to the error amplifier.