Abstract: A switching power supply circuit, which includes: a switch; a coil serving as an energy transmitting element; and a capacitor serving as an output generation circuit that outputs, as an output voltage, the energy transmitted from the coil. The switching power supply circuit also includes an output voltage detection circuit that generates a detection signal according to the output voltage; a PNP transistor serving as a transmission circuit that outputs a transmission signal according to a value of the detection signal; and a controller that controls the switch according to the transmission signal. The switching power supply circuit further includes a diode serving as a rectifying element connected between the transmission circuit (PNP transistor) and the controller.

Abstract: A switching power supply circuit according to an aspect of the present invention includes: a switch; a coil serving as an energy transmitting element; a capacitor serving as an output generation circuit that outputs, as an output voltage, the energy transmitted from the coil; an output voltage detection circuit which generates a detection signal according to the output voltage; a PNP transistor serving as a transmission circuit that outputs a transmission signal according to a value of the detection signal; a controller which controls the switch according to the transmission signal; and a diode serving as a rectifying element connected between the transmission circuit (PNP transistor) and the controller.