| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem that stable power supply can not be executed since when an input/output voltage difference is small during the power-on, a current is not made to flow in a coil despite the on-state of a switch connected between the input and the coil, a switch connected between the coil and the VSS is turned on at the next timing, and a current is made to flow between the input and the VSS via the coil. <P>SOLUTION: An MIN duty during the power-on is limited. A current is surely made to flow in the coil connected between the input and the output. Energy is held in the coil at the next timing. Therefore, the power-on is executed without extracting electric charges of the output. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
