Dual constant time switching regulator and switching control circuit and method thereof

A switching control circuit, configured to operably control a dual constant time switching regulator, wherein the dual constant time switching regulator comprises a power circuit and the switching control circuit, the power circuit including an inductor and at least a power switch and is configured to operably convert an input voltage to an output voltage;

• the switching control circuit being configured to operably generate a switch control signal according to a signal related to the output voltage (an output voltage related signal) to control the power switch, and the switching control circuit including:
• a comparison circuit, configured to operably compare a first input signal and a second input signal to generate a comparison result, wherein the first input signal and the second input signal are one of the following combinations:
• (1) the first input signal is a triangle wave signal, and the second input signal is an error amplified signal;
• or (2) the first input signal is the output voltage related signal, and the second input signal is a reference voltage;
• and
• a time determining circuit, configured to operably generate the switch control signal according to the comparison result, wherein the power switch keeps ON for at least a minimum ON time after the power switch is turned ON, and after the minimum ON time finishes, the power switch keeps ON until the level of the first input signal is higher than the level of the second input signal, and at this time point the power switch is turned OFF, wherein the power switch keeps OFF for at least a minimum OFF time after the power switch is turned OFF, and after the minimum OFF time finishes, the power switch keeps OFF until the level of the first input signal is lower than the level of the second input signal, and at this time point the power switch is turned ON.

A method for controlling a dual constant time switching regulator, wherein the dual constant time switching regulator comprises a power circuit which includes an inductor and at least a power switch and is configured to operably convert an input voltage to an output voltage;

• the method including:
• comparing a first input signal and a second input signal to generate a comparison result, wherein the first input signal and the second input signal are one of the following combinations:
• (1) the first input signal is a triangle wave signal, and the second input signal is an error amplified signal;
• or (2) the first input signal is the output voltage related signal, and the second input signal is a reference voltage;
• and
• generating a switch control signal according to the comparison result to control the power switch, wherein the power switch keeps ON for at least a minimum ON time after the power switch is turned ON, and after the minimum ON time finishes, the power switch keeps ON until the level of the first input signal is higher than the level of the second input signal, and at this time point the power switch is turned OFF, wherein the power switch keeps OFF for at least a minimum OFF time after the power switch is turned OFF, and after the minimum OFF time finishes, the power switch keeps OFF until the level of the first input signal is lower than the level of the second input signal, and at this time point the power switch is turned ON.