| 摘要 |
To provide a switching power supply device, and an operation condition setting method thereof, wherein it is possible to set an operation condition during an initialization period by adjusting the resistance value of a resistor that grounds an OUT terminal or IS terminal. A switching power supply device includes an oscillator circuit (3) that regulates the switching frequency of a switching element (Q1), a drive circuit (4) that turns (Q1) on and off based on an oscillation signal from the oscillator circuit (3), a condition setting circuit (6), disposed inside a power supply control IC (100) configured to include the oscillator circuit (3) and drive circuit (4), that outputs a condition indicating signal for indicating an operation condition of the switching power supply device, and a control circuit (1) that instructs the condition setting circuit (6) to determine a condition indicating signal within an initialization period immediately after the start of a supply of power to the power supply control IC (100), wherein a first resistor (R1) having an adjusted resistance value is connected to an external terminal of the power supply control IC (100) from which is output a drive signal to (Q1).
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