Patent ID: 7489119

Claim:
A controller for a DC to DC converter comprising: an error amplifier configured to receive a first signal representative of an actual output voltage of said DC to DC converter and a reference signal representative of a desired output voltage of said DC to DC converter and to provide an error signal representative of a difference between said first signal and said reference signal; and a pulse width modulation (PWM) modulator with reference voltage compensation circuitry configured to receive said error signal and compensate for a change in said reference signal in order to control overshoot and undershoot of said actual output voltage from a desired voltage due to said change of said reference signal, wherein said PWM modulator with reference voltage compensation circuitry comprises: a differential amplifier configured to receive a second signal representative of said error signal and a third signal representative of said reference signal and to provide a compensated voltage signal in response to a difference between said second signal and said third signal; and a comparator configured to receive said compensated voltage signal and a periodic signal and to provide a PWM signal to said DC to DC converter in response to a comparison of said compensated voltage signal with said periodic signal.