Patent ID: 8947058
Filing Date: 2015-02-03
Classification: G03G

Abstract:
1. A switching power supply device comprising: a switching power supply integrated circuit that includes a filter that is connected to the output terminal and includes a coil for cutting off a high frequency and a capacitor for passing the high frequency; a first diode that has a cathode connected to the source of the high-side switch element and an anode connected to the output terminal, the first diode being arranged outside the switching power supply integrated circuit; and a second diode that has an anode connected to the source of the low-side switch element and a cathode connected to the output terminal, the second diode being arranged outside the switching power supply integrated circuit, wherein one of the first diode and the second diode conducts in a period in which both of the high-side switching element and the low-side switching element are turned off, wherein the drive signal generating unit generates the first PWM signal for turning on the high-side switching element when the second diode is turned off, and wherein the drive signal generating unit generates the second PWM signal for turning on the low-side switching element when the first diode is turned off.