| 摘要 |
PROBLEM TO BE SOLVED: To provide a power source regulator circuit wherein fluctuation of an output voltage is small even without adding a capacitor to an output terminal. SOLUTION: This power source regulator circuit has: a P-type MOSFET 1 connected to between an input power source terminal 10 and the output terminal 20; resistors R1, R2 connected to between the output terminal 20 and a ground terminal 30; a comparator 3 comparing a feedback voltage Vfb obtained by dividing the output voltage Vout of the output terminal 20 by the resistors R1, R2 and a reference voltage Vref generated by a reference voltage generation circuit 2, and changing a voltage inputted to a gate terminal of the P-type MOSFET 1 such that the feedback voltage Vfb accords with the reference voltage Vref; an N-type MOSFET 4 connected to the P-type MOSFET 1 in parallel, turning off when the output voltage Vout is a prescribed voltage, and turning on when the output voltage Vout falls; and a constant voltage generation circuit 5A generating a gate voltage of the N-type MOSFET 4. COPYRIGHT: (C)2007,JPO&INPIT
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