SWITCHING POWER SUPPLY DEVICE

摘要

A switching power supply device includes a slope compensation circuit configured to start slope compensation for suppressing subharmonic oscillation in accordance with a timing signal from an oscillation circuit. The oscillation circuit is provided with a first circuit, which generates a signal of a fundamental oscillation frequency, and a second circuit, which applies logic processing to the signal of the fundamental oscillation frequency to form the timing signal. Thus, it is possible to provide a switching power supply device in which a variation in a start timing of slope compensation can be suppressed.

主权项

1. A current mode control switching power supply device comprising:
a compensation circuit that performs signal compensation by generating a signal to suppress subharmonic oscillation in the switching power supply device; and an oscillation circuit including
a first circuit that generates a signal having a fundamental oscillation frequency, anda second circuit that applies logic processing to the signal having the fundamental oscillation frequency to set
a switching cycle of the switching power supply device corresponding to the fundamental oscillation frequency, anda start time of the signal compensation, the signal compensation being performed by the compensation circuit in response to the start time being set by the oscillation circuit.