Patent ID: 11916483
Assignee: ABLIC INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A switching regulator control circuit, comprising:
a comparator configured to compare a divided voltage corresponding to an output voltage from a DC/DC converter and a reference voltage;
an RS-FF circuit having a set terminal connected to an output terminal of the comparator, and an output terminal connected to an input terminal of a drive circuit; and
an ON-timer circuit having an input terminal connected to the output terminal of the RS-FF circuit, and an output terminal connected to a reset terminal of the RS-FF circuit,
the ON-timer circuit including:
a current source circuit configured to provide an electric current based on a power supply voltage;
a ripple generation circuit configured to generate a ripple voltage depending on the electric current and an output signal from the RS-FF circuit;
an averaging circuit configured to average the ripple voltage;
a timer circuit configured to generate an ON-timer signal depending on the electric current, the output signal from the RS-FF circuit, and the averaged ripple voltage; and
an overvoltage protection circuit configured to provide the ON-timer signal irrespective of the ON-timer signal from the timer circuit when detecting that the averaged ripple voltage is a predetermined voltage or more.