Silergy Semiconductor Technology (hangzhou) Ltd

Di Luo

Liangwei Sun

A control circuit for a switching converter, where: in a first operation state, the control circuit controls a switching period of the switching converter to remain unchanged, controls a turn-on time of a power transistor in the switching converter to be not less than a minimum turn-on time in each switching period, and controls a turn-off time of the power transistor to be not less than a minimum turn-off time; in a second operation state, the control circuit controls the turn-on time of the power transistor to be the minimum turn-on time in each switching period, and adjusts the switching period to further reduce a duty cycle; and in a third operation state, the control circuit controls the turn-off time of the power transistor to be the minimum turn-off time in each switching period, and adjusts the switching period to further increase the duty cycle.

Control circuit for switching converter with minimum on-time and off-time control and wide duty range

A mode switching circuit for a switching power supply having a power switch and a synchronous switch is configured to: control the switching power supply to switch between a first mode and a second mode in response to a transitioning of a load of the switching power supply, in order to suppress overshoot of an output voltage of the switching power supply; where an inductor current of the switching power supply is not less than zero in the first mode; and where the inductor current is allowed to be less than zero in the second mode.

Mode switching circuit and mode switching method for switching power supply

Controlling a switching power supply can include: generating a ramp signal having an amplitude that follows an output feedback signal of the switching power supply; and controlling a switching state of a main power transistor in the switching power supply to be switched when the ramp signal reaches a peak value such that an output signal of the switching power supply is maintained as substantially constant.

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Hangzhou, China

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