A POWER REGULATOR SYSTEM WITH CURRENT LIMIT INDEPENDENT OF DUTY CYCLE AND ITS REGULATION METHOD

摘要

A power regulator system with current limit independent of duty cycle and its regulation method. The power regulator system comprises an error voltage generator (16) that provides an error voltage based on a comparison of a reference voltage and a feedback voltage associated with an output voltage of the system, a PWM comparator (18) configured to generate a switching signal that controls activation and deactivation of at least a power switch, and a current limit circuit (28) configured to clamp the error voltage upon the error voltage exceeding a voltage limit having a magnitude that varies as a function of the duty cycle to provide a predetermined current limit that is substantially fixed independent of the duty cycle.