| 摘要 |
PURPOSE:To realize a voltage rise circuit obtainable a stable output voltage with a low cost by constituting an output voltage detecting circuit by a zener diode and a transistor and a resistance for dividing a potential. CONSTITUTION:By a voltage rise circuit comprising a frequency dividing flip flop (FF) circuit 11 having a clock signal input terminal 12 and an input terminal 13 of a power source voltage Vcc and a synchronizing FF circuit 14 and the like, an output of a diode pump circuit 15 rises and an output voltage VD of a predetermined value is obtained in an output terminal 21. When a potential dividing voltage of this output voltage VD is larger than a sum of a zener voltage of a zener diode 27 and a voltage between a base and an emitter of a transistor 28, the transistor 28 is turned on and outputs a reset input to a reset terminal of the frequency dividing FF circuit 11. Thereby, the output voltage VD becomes a constant voltage value. By enlarging the zener voltage, uneveness in the output voltage VD can be made small.
|
