Patent ID: 7558037

Claim:
An integrated circuit, comprising: a voltage controlled oscillator for providing pulses at a frequency corresponding to a voltage received at an feedback input pin; a first switching output for driving a high-side driver transistor at a frequency proportional to the pulses; a second switching output for driving a low-side driver transistor at a frequency proportional to the pulses, the second switching output being a non-overlapping inverted signal from the first switching output; a current sense input pin for receiving a voltage corresponding to current flowing in an external load circuit; a latch off function that outputs a latch off signal when the voltage received at the current sense input pin is greater than a first threshold voltage; a VCO influence function outputting a VCO influence signal that increases the frequency of the VCO when the voltage input to the current sense input pin is greater than a second threshold voltage, and that decreases the frequency of the VCO when the voltage input to the current sense input pin is less than a third threshold voltage, the second threshold voltage being less than the first threshold voltage and greater than the third threshold voltage; and a switch off function that outputs a switch off signal when the voltage at the feedback input pin exceeds a maximum operating voltage for a time period greater than a blanking time period.