Patent ID: 6871289

Claim:
A power supply comprising: a buck regulator coupled to a regulator input voltage and generating a regulated output voltage for powering a load referenced to a first ground potential in response to an ON-time voltage pulse, wherein said ON-time voltage pulse has a first logic state when said regulated output voltage supplies energy to said load directly from said regulator input and a second logic state when said regulated output voltage is supplying energy stored from said regulator input voltage; a controller for generating said ON-time voltage pulse in response to said regulator input voltage, said regulated output voltage, and a compensated reference voltage; a reference circuit having a reference output generating a modified reference voltage relative to said first ground potential in response to a reference input voltage generated relative to a second ground potential; and compensated reference circuitry for generating said compensated reference voltage as a time integral of a difference between said modified reference voltage and said regulator output voltage multiplied times a gain factor.