| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for securing stability of a voltage value of an output voltage.SOLUTION: A power supply circuit includes: a switching regulator which steps down a battery voltage to a first specific voltage; a series regulator which has a switching element and a capacitor connected to a post stage of the switching element, and steps down the first specific voltage to output a second specific voltage; and a control circuit which adjusts the amount of electric charge accumulated in the capacitor in accordance with a voltage value of the first specific voltage. Thus, oscillation of a main voltage of a power supply circuit is prevented and stability of the voltage value is secured. |
