| 摘要 |
PURPOSE:To provide the constant voltage circuit which is hardly affected by the fluctuation of an input voltage or an output current. CONSTITUTION:A resistor R3 for current limitation is connected between the output of an input voltage stabilizing circuit 1 and the input of a reference power source 2, a capacitor C is connected between the input of the reference power source 2 and the ground, and a voltage Vi at both the terminals of the capacitor C is supplied to the reference power source 2. Thus, even when an input power supply voltage Vin is instantaneously fluctuated, since the fluctuation can be absorbed by the serial circuit of the resistor R3 for current limitation and the capacitor C, an output voltage Vout can be stabilized by reducing an influence to be exerted upon a reference voltage Vc outputted from the reference power source 2. Therefore, even when the input power supply voltage Vin is instantaneously fluctuated, the influence to be exerted upon the reference voltage Vc to be the reference of the output voltage Vout can be reduced, and the output voltage can be stabilized. |
