Patent ID: 8896284
Filing Date: 2014-11-25
Classification: H02M,Y02B

Abstract:
1. A DC-DC converter receiving an input voltage and generating an output voltage, comprising: an inductor; a switch switching the input voltage to a first side of the inductor; a comparator controlling initiation of closing the switch; and, the first side of the inductor capacitively coupled to a first input of the comparator; a second switch switching the first side of the inductor to ground; circuitry receiving a voltage at the first side of the inductor, receiving a state of the second switch, and controlling at least part of the signal path between the first side of the inductor and the first input of the comparator for providing a signal at a first strength to the first input of the comparator; and, the circuitry configured to provide the signal at a second strength less than the first strength from the first side of the inductor to the first input of the comparator only when the circuitry determines that a discontinuous conduction mode (DCM) exists for the inductor; further comprising: a resistance comprising a series combination of a first resistor having a resistance much greater than a second resistor in the path between the first side of the inductor and the first input of the comparator; a third switch in parallel with the first resistor; and, the circuitry configured to cause the third switch to open when the circuitry determines that a DCM exists for the inductor.