| 摘要 |
A power supply circuit has a switching transistor and a inductance coil that are connected between an input terminal and an output terminal. A voltage across a capacitor that is connected between the output terminal and a ground potential node is extracted as an output voltage. Between the output terminal and the ground potential node, a Zener diode and a resistor are connected in series. When a voltage across the resistor exceeds a predetermined value, the switching transistor is put into a cut-off state by a drive circuit.
|
