| 摘要 |
PROBLEM TO BE SOLVED: To lessen an overcurrent area by providing a steep overcurrent drooping characteristic, to prevent oscillations at startup and to limit an inrush current within a predetermined range, in a stabilized power supply with a current limiting function. SOLUTION: By controlling an output transistor Q21 according to a difference between an output feedback voltage Vfb responsive to an output voltage Vo and a reference voltage Vref, a constant output voltage Vo is outputted. There are provided a first current limiting circuit 40 of high gain and low response type which detects an output current Io of an output circuit 20 and generates a current limiting signal respectively when the output current Io exceeds a predetermined value, and a second current limiting circuit 50 of low gain and high response type. COPYRIGHT: (C)2004,JPO
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