| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a switching power-supply device that allows considerably improving line regulation characteristics.SOLUTION: A switching power-supply device includes: an on-timer controlling the on-time of a main switching element; a voltage detection circuit detecting an output voltage of a filter circuit connected to the switching element; a triangular-wave generator generating a triangular-wave signal; a feedforward circuit generating a feedforward output having a value that decreases as a value of a DC voltage of a DC power supply becomes larger; and a comparator comparing an output voltage from the voltage detection circuit with a second reference voltage generated by adding a first reference voltage, the triangular-wave signal from the triangular-wave generator, and the feedforward output from the feedforward circuit, and outputting an on-trigger signal for turning on the main switching element to the on-timer on the basis of the comparison result.</p> |
