| 摘要 |
PURPOSE: A power detecting device for a vehicle is provided to prevent the malfunction of a power source detection IC under operation voltage of the power source detection IC. CONSTITUTION: A power detecting device(100) for a vehicle comprises an operating voltage setup unit(110), a power detecting unit(120), a charging capacitor(C1), and a feedback circuit. The power detecting unit receives operation voltage converted in battery power source through input node and detects the abnormality of operation voltage. The power detecting unit outputs the detection result of the abnormality as logic voltage through an output node. The charging capacitor connects one electrode to the output node through a pull-up resistor and charges battery power. The feedback circuit connects to the power detecting unit in parallel. The charging capacitor connects to one electrode. When the voltage level of the input node descends below the voltage level of the operation voltage, the feedback circuit feedbacks charging potential charged in the charging capacitor to the input node.
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