Current-mode controller for switching DC/DC converter having a reduced output ripple current

摘要

A switch arranged between a DC power supply source and a load is driven depending on the state of a flip-flop circuit. An error amplifier outputs an instruction value signal determined based on an output voltage. A comparator outputs a first reset signal when an inductor current reaches the instruction value signal. An oscillator generates a set pulse. A first AND gate feeds as a second reset signal an AND-operation result between the Q-output of the flip-flop circuit and the first reset signal to the reset terminal of the flip-flop circuit and the negative logic input terminal of a second AND gate. The second AND gate feeds the set pulse to the set terminal of the flip-flop circuit according to the second reset signal.