SWITCHING POWER SUPPLY CIRCUIT

摘要

According to an embodiment, a switching power supply circuit includes a comparison circuit and an operation control circuit. The comparison circuit operates intermittently in response to an operation control signal. The comparison circuit compares a feedback voltage based on the output voltage with a reference voltage to generate a comparison result signal representing a result of comparison. The operation control circuit generates the operation control signal based on the clock signal and the comparison result signal. The operation control circuit generates an operation control signal synchronous with the clock signal, if the comparison result signal is at the first level.

主权项

1. A switching power supply circuit comprising:
a power switch circuit that generates an output voltage different in level from an input voltage, using a clock signal; a comparison circuit that operates intermittently in response to an operation control signal, the comparison circuit comparing a feedback voltage based on the output voltage with a reference voltage to generate a comparison result signal representing a result of comparison; an oscillation circuit that oscillates at a predetermined frequency to generate the clock signal, if the comparison result signal is at a first level; and an operation control circuit that generates the operation control signal based on the clock signal and the comparison result signal, wherein the operation control circuit generates an operation control signal synchronous with the clock signal, if the comparison result signal is at the first level.