公开(公告)号：US20030122531A1

公开(公告)日：2003-07-03

申请号：US10237164

申请日：2002-09-06

Applicant: STMicroelectronics S.A.

Inventor： Jerome Nebon ,  Alexandre Balmefrezol

IPC: G05F001/40

CPC classification number: H02M3/156

Abstract: A switched mode power supply device comprising a power transistor periodically set to conduction and supplying a regulated voltage that comprises a ramp generation circuit controlled by a clock signal and periodically generating a ramp voltage. The device includes an amplifier error circuit between a reference voltage and said regulated output voltage and generates an error signal, and a comparator comparing the ramp voltage with said error voltage and providing an output signal for controlling said power circuit. The circuit is characterized in that it comprises a delay element delaying the setting to conduction of the power transistor so as to desynchronize the starting of the ramp and said setting to conduction.

Abstract translation: 一种开关模式电源装置，包括周期性地设置为导通的功率晶体管并且提供包括由时钟信号控制的斜坡发生电路并周期性地产生斜坡电压的稳压电压。 该装置包括参考电压和所述调节输出电压之间的放大器误差电路，并产生误差信号，以及将斜坡电压与所述误差电压进行比较并提供用于控制所述电源电路的输出信号的比较器。 该电路的特征在于它包括延迟元件延迟功率晶体管导通的设置，以使斜坡的起始和所述设置的导通失速。