| 摘要 |
PROBLEM TO BE SOLVED: To provide a control circuit for a DC-DC converter which interrupts a short circuit current and generates an output voltage even after interruption, and to provide the control method for a DC-DC converter and an electronics. SOLUTION: In the control circuit for a DC-DC converter, a transistor Tr1 and a transistor Tr2 are turned on/off at the control circuit section 3, and the input voltage VIN is boosted and output as the output voltage VO from the output terminal Ta to a load 5. A transistor Tr3 for current cut-off is provided between a first node N1 which is between the transistor Tr2 and the output terminal Ta and a second node N2. The second node N2 is connected with a voltage division circuit 11 through the first switching transistor Tr4. The first node N1 is connected with the voltage division circuit 11 through the second and third switching transistors Tr5 and Tr6. When the load 5 is short-circuited, the transistors Tr3 and Tr4 are turned off while the transistors Tr5 and Tr6 are turned on, and the voltage at the first node N1 is output as the feedback voltage to the voltage division circuit 11. COPYRIGHT: (C)2010,JPO&INPIT
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