| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent generation of a malfunction in an insulated switching power supply. <P>SOLUTION: An insulated switching power supply 1, when a mode switching signal operated in a normal mode is input, turns on a photo-transistor PT1 to decrease a voltage of a terminal P1 of a control circuit 2 and control a switch element Q1 according to the voltage of the terminal P1. When an output voltage V<SB POS="POST">OUT</SB>is equal to or below an output drop detection voltage VSEN in a normal mode, the control circuit 2 decreases the voltage of the terminal P1 with a discharge section 15. <P>COPYRIGHT: (C)2012,JPO&INPIT |
