Patent ID: 7215104
Filing Date: 2007-05-08
Classification: H02M

Abstract:
1. A DC/DC converter, comprising: a switching device which, by closing and opening, supplies power from a power-supply side to a load side, and maintains the load side at an output setting voltage; an error amplifier which amplifies the error between the voltage from the load side and an error comparison reference voltage, and outputs an output voltage; an oscillator which outputs a oscillation clock having a pulse width of a low duty factor from a leading edge to a trailing edge; a slope circuit which outputs, in synchronization with the oscillation clock, a sawtooth waveform voltage having a slope beginning before the trailing edge of the oscillation clock; a comparator which compares the sawtooth waveform voltage of the slope circuit with the output voltage of the error amplifier; and, a logic circuit which is set by the trailing edge of the oscillation clock and reset by the comparator output signal with a delay time, wherein said switching device closes and opens according to the output pulse signal from said logic circuit.