公开(公告)号：US20020093322A1

公开(公告)日：2002-07-18

申请号：US10017911

申请日：2001-12-14

Applicant: STMicroelectronics S.A.

Inventor： Nicolas Marty ,  Regis Robert

IPC: G05F001/40

CPC classification number: G05F1/575 ,  G05F1/565

Abstract: A voltage regulating device includes a comparison circuit for comparing a voltage proportional to an output voltage to a fixed reference voltage. The fixed reference voltage is received on a first input and the voltage proportional to an output voltage is received on a second input. The voltage regulating device further includes a variable resistance-forming circuit controlled by the output of the comparison circuit and disposed so that the output voltage remains substantially constant. The voltage regulating device may be supplied with a variable input voltage. The voltage regulating device further includes a second comparison circuit so that the output voltage remains substantially constant if the input voltage is greater than a threshold, and substantially equal to the input voltage if the input voltage is less than the threshold.

Abstract translation: 电压调节装置包括比较电路，用于将与输出电压成比例的电压与固定参考电压进行比较。 在第一输入端接收固定参考电压，并在第二输入端接收与输出电压成比例的电压。 电压调节装置还包括由比较电路的输出控制的可变电阻形成电路，并被布置为使得输出电压基本保持恒定。 可以向电压调节装置提供可变的输入电压。 电压调节装置还包括第二比较电路，使得如果输入电压大于阈值，则输出电压保持基本恒定，并且如果输入电压小于阈值则基本上等于输入电压。