| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply control circuit that does not require a control integrated circuit (IC) for power supply control, consumes no current when the power supply control circuit is turned OFF, and actualizes a soft switch function for an power source with an extremely small-scale circuit. <P>SOLUTION: In the power supply control circuit, when a power switch 2 is turned OFF in a state where a switching element FET 1 is turned OFF, the switching element FET 1 is turned ON and is held in the ON state by digital transistors Tr1 and Tr2, and when an ON signal of the power switch 2 is detected in a state where the switching element FET 1 is turned ON, a control circuit 3 outputs a latch cancel signal after the ON signal of the power switch 2 changes to a OFF state, and the switching element FET 1 turns OFF the output of an output voltage to the control part 3. <P>COPYRIGHT: (C)2012,JPO&INPIT |
