Patent ID: 9698680
Date: 2017-07-04
CPC Classifications: H02M

Claim:
1. A switching power device comprising: a main circuit that includes a switching element and a coil, and adjusts a current flowing through the coil and outputs a voltage in response to a change in a driving signal; an output voltage detection circuit that outputs a first voltage corresponding to the voltage outputted from the main circuit; an error amplification circuit that outputs an error signal in response to a difference between the first voltage of the output voltage detection circuit and a second voltage corresponding to a control target voltage of the main circuit; an oscillation circuit that outputs an oscillation signal; a driving circuit that outputs the driving signal to the switching element in response to a comparison result obtained by comparing the oscillation signal of the oscillation circuit and the error signal of the error amplification circuit; and a soft-start control unit that sets the second voltage, which is provided to the error amplification circuit, to be at a restart voltage between a control standard voltage, which corresponds to a target output voltage of the main circuit, and a control start voltage of the main circuit in response to the first voltage of the output voltage detection circuit when the first voltage of the output voltage detection circuit drops at or below a soft-start threshold voltage between a standard detection voltage and a start detection voltage.