Switching regulator
View Patent ↗To provide a switching regulator equipped with an on-time control circuit small in power consumption. An on-time control circuit is configured to be equipped with switches each turned on/off by a signal controlling on and off of a switching element and be turned off during an off-time of the switching element.
1. A switching regulator outputting a desired output voltage to an output terminal by a switching element from a power supply voltage, comprising:
an error comparator which monitors the output voltage to output a set signal;
an on-time control circuit which outputs a reset signal controlling an on-time of the switching element;
an R-S flip-flop which outputs an on signal determining a period of turning on the switching element, based on the set signal and the reset signal; and
an output control circuit which outputs a control signal to the switching element, based on the on signal of the R-S flip-flop,
wherein the on-time control circuit comprises a first input terminal inputted with the on signal outputted from the R-S flip-flop, and a second input terminal inputted with the control signal outputted from the output control circuit and performs an intermittent operation, based on the control signal inputted to the second input terminal.
2. The switching regulator according to claim 1 , wherein the on-time control circuit comprises switches whose on/off are controlled based on the control signal inputted to the second input terminal, and current sources connected to the switches respectively, and
wherein the switches are turned off during a period of turning off the switching element to shut off the supply of currents from the current sources to circuits.