Patent ID: 7023190

Claim:
A switched mode power supply comprising: at least one power switch adapted to convey power between input and output terminals of said power supply; and a digital controller adapted to control operation of said at least one power switch responsive to an output measurement of said power supply, said digital controller comprising: an analog-to-digital converter providing a digital error signal representing a voltage difference between said output measurement and a reference value, said analog-to-digital converter further comprises a windowed flash analog-to-digital converter having a transfer function defining a relationship between said voltage difference and corresponding digital values, said transfer function having a substantially linear region at a center of a corresponding error window, said transfer function further comprises a first step size in said center of said error window and at least one additional step size in a peripheral region of said error window, each said at least one additional step size being larger than said first step size; a digital filter providing a digital control output based on a sum of current and previous error signals and previous control outputs; and a digital pulse width modulator providing a control signal to said at least one power switch, said control signal having a pulse width corresponding to said digital control output.