| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching regulator which generates stable DC voltage, while maintaining a high efficiency. SOLUTION: If a switching element Q1 is in an on-state, coil current increases, and output voltage rises. If the switching element Q1 is at an off-state, the coil current decreases and the output voltage lowers. The switching element Q1 is operated in accordance with the state of a flip-flop 101. The flip-flip 101 is set by the output of an oscillator 102 and is reset on the basis of the coil current. In a period while the coil current is smaller than a current value which corresponds to a minimum value signal VMIN, the switching element Q1 continues its on-state. The level of the minimum value signal VMIN decreases with the passage of time, while the switching element Q1 is controlled to be in the on-state.
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