| 摘要 |
PROBLEM TO BE SOLVED: To stabilize the operation by reducing a circuit scale of a power source monitoring circuit. SOLUTION: Resistance elements 12a, 12b are connected in series between a power source and the earth, and a potential VS. used as a monitoring potential is taken out from there between. A diode 13 and a resistance element 14 are connected in series between the power source and the earth, and a potential VR used as a reference potential is taken out from the connection point. The potential VS and the potential VR are inputted into a voltage comparator 11 composed of a differential amplifier of an N-channel input type, and an output potential VC, raisable when the potential VS exceeds the potential VR, is obtained.
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