Patent ID: 8624572
Filing Date: 2014-01-07
Classification: H02M

Abstract:
1. A switching control circuit including a semiconductor integrated circuit arranged to define a power conversion circuit in a switching power-supply apparatus to control a switching element, the semiconductor integrated circuit including external terminals including a power-supply terminal to which a power-supply voltage is applied from outside of the semiconductor integrated circuit to inside of the semiconductor integrated circuit, an input terminal arranged to input a voltage signal from the outside to the inside, and an output terminal arranged to output a voltage signal from the inside to the outside, at least one of the external terminals defining a multifunctional external terminal, the switching control circuit comprising: a first operation-state setter arranged to set a first operation parameter or first operation mode information of the power conversion circuit or first control of the switching element, based on a signal of the multifunctional external terminal; and a second operation-state setter arranged to detect, as a determination signal, a voltage induced in an external circuit that is connected outside of the multifunctional external terminal and that includes at least a resistance element or a semiconductor element and to set a second operation parameter or second operation mode information of the power conversion circuit in accordance with the determination signal; wherein the second operation-state setter is arranged to set the second operation parameter or the second operation mode information, in accordance with a voltage value of a voltage to be compared, the voltage value being obtained in a period other than a period of a power conversion operation of the power conversion circuit.