| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-output power supply circuit capable of preferably controlling a voltage mode control type switching power supply circuit, and to provide a current mode control type switching power supply circuit. SOLUTION: In a multi-output power supply circuit, a first converter 2 is configured to include a first detection circuit 31 for delivering a first control signal, a first oscillation circuit 32 for delivering a first triangular wave signal and a clock signal, and a first pulse width modulation circuit 33 for driving a first switch by comparing between the first control signal and the first triangular wave signal. A second converter 4 is configured to include a second detection circuit 34 for delivering a second control signal, a second oscillation circuit 35 for delivering a second triangular wave signal synchronized with the clock signal, a current detection circuit 36 for delivering an current signal of a second inductor, and a second pulse width modulating circuit 37 for energizing a second switch, in synchronism with the clock signal, and for interrupting the second switch, by computing or comparing among the second control signal and the second triangular wave signal and the current signal. COPYRIGHT: (C)2006,JPO&NCIPI
|
