Abstract: A switching regulator includes a switch device that is connected between an input terminal to which an input DC voltage is applied and an output terminal from which an output DC voltage is output, and that is turned on and off according to a drive signal; a hysteresis generation circuit to which the input DC voltage and the output DC voltage are applied; a reference voltage generation circuit that generates a reference voltage having a gradient proportional to an output current or an output voltage; and a drive signal generation circuit that generates the drive signal by comparing the output DC voltage with the reference voltage, and that, where the hysteresis generation circuit generates the output current or the output voltage that is inversely proportional to a differential voltage between the input DC voltage and the output DC voltage.

Abstract: A switching regulator includes a switch device that is connected between an input terminal to which an input DC voltage is applied and an output terminal from which an output DC voltage is output, and that is turned on and off according to a drive signal; a hysteresis generation circuit to which the input DC voltage and the output DC voltage are applied; a reference voltage generation circuit that generates a reference voltage having a gradient proportional to an output current or an output voltage; and a drive signal generation circuit that generates the drive signal by comparing the output DC voltage with the reference voltage, and that, where the hysteresis generation circuit generates the output current or the output voltage that is inversely proportional to a differential voltage between the input DC voltage and the output DC voltage.

Abstract: A power supply apparatus having a soft start function that enables a startup without any overshoot within an appropriate startup time regardless of whether the load is heavy or light. Even when output direct current voltage Vo has not yet risen upon startup, switch circuit (4) is turned ON within a count time of timer (7), and clamping circuit (5) clamps error signal (Ve) of error amplifier (2), so that an excessive signal is prevented from entering PWM circuit (6), and electric power supplied to load (13) is controlled. Consequently, supply power as the power supply apparatus is limited, and any inrush current can be prevented from being generated. By controlling the count time of timer (7) when this error signal is clamped, it is possible to realize a startup within an appropriate startup time without any overshoot.

Abstract: A power supply apparatus having a soft start function that enables a startup without any overshoot within an appropriate startup time regardless of whether the load is heavy or light. Even when output direct current voltage Vo has not yet risen upon startup, switch circuit 4 is turned ON within a count time of timer 7, and clamping circuit 5 clamps error signal Ve of error amplifier 2, so that an excessive signal is prevented from entering PWM circuit 6, and electric power supplied to load 13 is controlled. Consequently, supply power as the power supply apparatus is limited, and any inrush current can be prevented from being generated. By controlling the count time of timer 7 when this error signal is clamped, it is possible to realize a startup within an appropriate startup time without any overshoot.