Patent ID: 6219262
Filing Date: 2001-04-17
Classification: H02M

Abstract:
A circuit for blanking out the leading edge current spike in the feedback path of a pulse-width modulated current mode switching power supply controller, comprising:a current-sense resistor coupled to a transistor within said feedback path, said current-sense resistor providing a voltage waveform in response to current through said transistor;a switch coupled to said current-sense resistor within said feedback path, said switch for alternately breaking and re-establishing continuity of said feedback path;a current sensing device incorporated in the gate charge current path of said transistor for sensing said leading edge current spike and controlling said switch in response thereto, thereby breaking and re-establishing continuity of said feedback path to create a blanking interval optimally positioned such that the leading edge of said voltage waveform corresponding to said leading edge current spike is blanked out and not propagated through said switch.