Patent ID: 7439719

Claim:
A switching control circuit, comprising: a switching element having a high potential terminal, a low potential terminal, and a control terminal, the high potential terminal being connected to an inductive load, the low potential terminal being connected to a circuit reference potential, the switching element being turned on/off in response to a switching control signal applied to the control terminal, an element current detection circuit for detecting element current passing through the switching element according to a detection criterion, thereby generating an element current detection signal for turning off the switching element, a blanking signal generator circuit for generating a blanking signal for making the element current detection signal ineffective for a fixed period after the switching element is switched from off state to on state, an off period adjusting circuit for generating, based on the element current detection signal and the blanking signal, an adjusting signal for adjusting an off period of the switching element according to an on period of the switching element, and an on/off circuit for generating, based on the element current detection signal, the blanking signal, and the adjusting signal, the switching control signal for controlling a periodic on/off operation of the switching element.