DC-DC CONVERTER USING INTERNAL RIPPLE WITH THE DCM FUNCTION

摘要

A DC-DC converter, having an input voltage and an output voltage, includes an inductor and a switch switching the input voltage to an input side of the inductor, where a feedback path controlling initiation of closing the switch includes capacitive coupling of the voltage at the input side of the inductor.

主权项

1. A DC-DC converter receiving an input voltage and generating an output voltage, comprising:
a feedback path comparing a fraction of the output voltage to a first reference voltage; an amplifier receiving a fraction of the output voltage and a second reference voltage, and having an amplifier output that is the difference between the fraction of the output voltage and the second reference voltage; a threshold circuit determining whether the magnitude of the output of the amplifier is greater than a threshold; an integrator integrating the output of the amplifier only when the threshold circuit determines that the magnitude of the output of the amplifier is greater than the threshold; and, an adder, adding an output of the integrator to the first reference voltage to adjust the first reference voltage.