Patent ID: 7129682
Filing Date: 2006-10-31
Classification: H02M

Abstract:
1. A control circuit having an error amplifier for voltage control, controlling a synchronous rectifying direct-current to direct-current conversion based on a pulse width modulation control using an output of said error amplifier, the error amplifier comprising: a first input terminal inputting a voltage signal corresponding to an output voltage of a result of said direct-current to direct-current conversion, and an amplifier amplifying a difference between a voltage from said first input terminal and a reference voltage gradually rising when the direct-current to direct-current conversion starts and becoming a constant value after a constant time, wherein said pulse width modulation control is carried out based on an output of the amplifier and further a soft start signal is supplied to a second input terminal of said error amplifier through a reference voltage circuit, the reference voltage circuit being comprised of a power supply unit and an FET.