| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply circuit which supplies a plurality of stable output voltages inexpensively and efficiently. SOLUTION: A DC-DC converter 1 generates a plurality of output voltages from power supplied from a single source and supplies the voltages to a load circuit. In the converter, an output voltage terminal which supplies a voltage from among the plurality of output voltages to the load circuit wherein a sink current is produced is provided with a Zener diode D2 having a Zener voltage higher than the output voltage. Thereby, a voltage rise due to the sink current from the load circuit is prevented. Thus, an output voltage outputted to the load circuit is prevented from rising as an abnormal voltage, and a plurality of stable output voltages are supplied inexpensively and efficiently. COPYRIGHT: (C)2004,JPO
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