Patent ID: 6275019
Filing Date: 2001-08-14
Classification: H02M

Abstract:
A non-overlap circuit for a controller of a switching power supply, the controller including a clock input coupled to a clocking signal, an enable input, a first drive output, and a second drive output, the non-overlap circuit comprising:a current source that senses the drive outputs, and in response, provides a current source output that switches on and off;a timing capacitor, coupled to the current source, that charges when the current source is on;a switch that discharges the timing capacitor when the current source is off; anda voltage comparator that compares the charge level on the timing capacitor to a reference voltage, and that outputs a trigger signal to the enable input of the controller when the charge level on the timing capacitor exceeds the reference voltage;wherein when one drive output switches logic state in response to the clocking signal, the current source charges the timing capacitor until the trigger signal causes the other drive output to switch logic state.