Patent ID: 7391195

Claim:
A self-oscillating direct current to direct current (DC-DC) converter comprising: an inductor coupled to receive a voltage input at an input terminal; a switch coupled between the inductor and a reference, wherein the switch receives a control signal for adjusting a duty cycle to control output voltage at an output terminal; and a controller coupled to receive a feedback signal derived as a predefined function of a voltage feedback signal indicative of the output voltage and a current feedback signal indicative of a current flowing through the inductor, wherein the controller provides the control signal in response only to the feedback signal, the controller imposing constraints on the control signal consisting essentially of or more of applying the control signal for a minimum off time when a load coupled between the output terminal and the reference draws a load current above a first threshold, applying the control signal for a minimum on time when a load coupled between the output terminal and the reference draws a load current below a second threshold, applying the control signal for a maximum on time when a load coupled between the output terminal and the reference draws a load current above a current threshold and when the voltage input is below a voltage threshold.