| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply circuit for controlling noise when switching an output from a series regulator to a switching regulator. Ž<P>SOLUTION: When the output of an entire output terminal 18 of the power supply circuit 10 is switched from the series regulator 14 to the switching regulator 12, a feedback loop of the switching regulator 12 is once opened by turning the fifth switch 55 off, the output of the series regulator 14 is output to the entire output terminal 18 while keeping the sixth switch 56 on, a pseudo feedback loop is formed between an output terminal and other terminal of an error amplifier 24, a voltage corresponding to the output of the series regulator 14 is output to the output terminal of the error amplifier 24, and a phase compensation capacitor 26 of the switching regulator 12 is charged thereby. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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