Control circuit, control method, DC-DC converter and electronic device

摘要

A control circuit (115), a control method, a DC-DC converter and an electronic device are provided. The control circuit (115) is used to control the DC-DC converter to switch its operation modes. In the control circuit (115), whether mode of the DC-DC converter is to be switched is judged according to parameters of a first duration of an active duration and a second duration of an inactive duration. Comparison of analog values is prevented, and as a result, the use of the analog comparator is reduced, thus the influence of the semiconductor processes on designing a controller can be reduced.

主权项

1. A method for controlling a DC-DC converter operable in a continuous mode and in a discontinuous mode, the discontinuous mode comprising active and inactive durations, the method comprising:
operating the DC-DC converter in the discontinuous mode; measuring a first duration of an active duration and a second duration of an inactive duration; judging whether a predefined criterion evaluated using the measured first duration and the measured second duration is satisfied; and switching the DC-DC converter to operate in the continuous mode if the predefined criterion is satisfied, wherein a first switching frequency of charging and discharging the DC-DC converter operating in the continuous mode is different from a second switching frequency of charging and discharging the DC-DC converter during the active duration of the discontinuous mode.