Switching control circuit, control circuit, and power supply circuit

Abstract

A switching control circuit for a power supply circuit including first and second inductors, and first and second transistors controlling first and second inductor currents flowing through the first and second inductors, respectively. The switching control circuit includes: a detection circuit detecting a switching period of the first transistor and a time difference between first and second timings, at which the first and second inductor currents respectively reach first and second predetermined values; an error output circuit outputting an error between a predetermined ratio and a ratio of the time difference to the switching period; and a driving signal output circuit configured to output a driving signal to turn on the second transistor, after the second inductor current reaches the second predetermined value, and to turn off the second transistor, in response to a second time period according to the first time period and the error having elapsed.