| 摘要 |
PROBLEM TO BE SOLVED: To provide a step-up/down type power supply circuit capable of achieving a quick response to load fluctuations by suppressing fluctuations in an output voltage when switching between step-down/step-up and -down/step-up operations.SOLUTION: Each of a first addition signal obtained by adding a reference current signal in proportion to an electric current running through an inductance element, a slope compensation signal and a voltage difference signal in proportion to a difference between an input voltage and an output voltage and a second addition signal obtained by adding a reference current signal and a slope compensation signal is compared to a difference signal between a voltage in proportion to an output voltage and a predetermined reference voltage. On the basis of the comparison result, a pulse duration of a driving pulse signal to a step-down switching circuit and a step-up switching circuit is controlled. |
