Patent ID: 7362083

Claim:
A DC-DC converter, comprising: an inductor connected in series with a power transistor between first and second terminals of a DC supply source; and a modulator circuit with a control output connected to a control gate of the power transistor; the modulator circuit providing a periodic pulse signal, the duty cycle of which determines an output voltage at an output terminal of the converter; wherein the modulator circuit comprises: an oscillator that determines the frequency of the periodic pulse signal; a feedforward structure that determines an approximated duty cycle for the pulse signal based on the value of the input voltage, the sensed output voltage and the amount of current flow in the inductor; and an error amplifier with a first input connected to a reference voltage source, a second input connected to the output terminal of the converter and an output that supplies a corrective signal used by the modulator to adjust the duty cycle of the pulse signal.