| 摘要 |
A switching regulator switch between an input terminal and an output terminal; a second switch between the output terminal and ground; a switching-time control circuit to generate a first signal when a first period corresponding to a ratio of ON-period of the first switch to a sum of those of the switches has elapsed from a reset-release timing and a reset signal when a second period longer than the first period has elapsed from the rest-release timing; a comparator to generate a second signal when a feedback voltage is smaller than a reference voltage; and a switch control circuit to control the switches so that the first switch is turned off and the second switch is turned on in response to the first signal, and the second switch is turned off and the first switch is fumed on in response to the second signal.
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