Richtek Technology Corporation

Kuo-Chun Wu

Hung-Yu Cheng

When a ramp signal intersects a feedback related signal, a constant time switching regulator enters a first state and maintains in the first state for a constant time, and after the constant time ends, when the ramp signal exceeds the feedback related signal, the switching regulator enters a second state, while when the ramp signal does not exceed the feedback related signal, the switching regulator enters a third state. In the first state, the first end of an inductor is connected to input voltage and the second end of the inductor is connected to output voltage; in the second state, the first end is connected to ground and the second end is connected to output voltage; and in the third state, the first end is connected to input voltage and the second end is connected to ground.

Constant-time buck-boost switching regulator and control circuit and control method thereof

A dual constant time switching regulator includes: a power circuit including an inductor and at least a power switch for converting an input power to an output power, and a switching control circuit for generating a switch control signal to control the power switch, wherein the switching control circuit includes a comparison circuit for comparing an error amplified signal and a triangle wave signal to generate a comparison result, and a time determining circuit for generating the switch control signal according to the comparison result, wherein after the power switch turns ON, it keeps ON for at least a minimum ON time until the triangle wave signal is higher than the error amplified signal, and wherein after the power switch turns OFF, it keeps OFF for at least a minimum OFF time and until the triangle wave signal is lower than the error amplified signal.

Growing community of inventors

Kaohsiung, Taiwan

Kuo-Chun Wu