| 摘要 |
PROBLEM TO BE SOLVED: To accurately regulate overshoot level of output voltage without using trimming. SOLUTION: In order to prevent the overshoot of the output voltage when the input voltage increases rapidly, a second differential amplifier 2A and a control transistor 22A are arranged. In the second differential amplifier 2A, a reference voltage V<SB>REF</SB>is input into a plus input terminal, a second partial voltage V<SB>FB2</SB>is input into a minus input terminal, and an output terminal is connected to a gate of the control transistor 22A. In the control transistor 22A, a source is connected to the source of an output transistor 21A, and a drain is connected to the gate of the output transistor 21A. When the second differential amplifier 2A reaches the output voltage slightly larger than the output voltage V<SB>OUT</SB>, the output is set to a low level and the control transistor 22A is turned on. By making the control transistor 22A turned on, the output transistor 21A is made to be turned off and the overshoot of the output voltage is suppressed. COPYRIGHT: (C)2007,JPO&INPIT
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