| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC-DC converter which can prevent deterioration in accuracy of an output voltage and be miniaturized. SOLUTION: The DC-DC converter 101 is provided with a switch element 2 for switching as to whether or not a DC input voltage is inputted into a primary coil 3A; conversion circuit 52 for supplying a DC voltage generated based on an induction voltage in a secondary coil 3B to a load 9; capacitor 14; rectifying element 10 coupled between an auxiliary coil 3D and the capacitor 14; rectifying element 11 and resistor 13 coupled in parallel between the capacitor 14 and the rectifying element 10; resistor 12 having a first end coupled to the capacitor 14 via the rectifying element 11 and the resistor 13, and a second end coupled to a predetermined potential; and switching control circuit 51 for switching ON/OFF of the switching element 2 on the basis of both end voltages of the capacitor 14. The rectifying elements 10 and 11 are coupled so that their energization directions can be opposite to each other. COPYRIGHT: (C)2008,JPO&INPIT
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