Patent ID: 7898825

Claim:
A current-mode controller comprising: an inductance element; at least one semiconductor switch coupled to the inductance element; and a ramp compensator coupled to sense an indication of current through the inductance element and coupled to control the at least one semiconductor switch that measures an on-ramp slope of a sensed current indication, infers an off-ramp slope, and adaptively adjusts a slope compensation signal slope to track changes in the off-ramp slope, wherein: the ramp compensator is configured to measure the indication of current as a sense voltage V SENSE and determine a switch on-time sense voltage V SENSE delta ΔV 1 when the at least one semiconductor switch enables current through the inductance element, measure a ramp voltage V RAMP and determine a switch off-time ramp voltage V RAMP delta ΔV X when the at least one semiconductor switch disables current through the inductance element, compare ΔV X to ΔV 1 , and adaptively increase or decrease the ramp voltage V RAMP delta ΔV X based on the comparison.