| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply circuit capable of suppressing a peak level of noise from increasing, resulting from an increase in an input voltage or a load current.SOLUTION: When a voltage detection section 7 generates a modulation control voltage in accordance with a change in an input voltage VIN involved in power consumption by a load 5, a frequency modulation section 8 frequency-modulates a carrier frequency with a triangular wave output by a triangular wave oscillator 9 according to the modulation control voltage. |
