| 摘要 |
There is provided a switching regulator control circuit for a PFM control for ensuring a continually constant output transistor ON period to output a stable duty. A signal for turning ON an output transistor is fed back, and then a logic signal between the fed back signal and an output signal of an output voltage control comparator is inputted as an oscillation start signal to an oscillating circuit. Thus, even in the case of a frequent variation in comparator output signal, which is liable to occur at a time when an output voltage extremely approaches a set voltage, an ON period for the output transistor is ensured.
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