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N-Channel Input-Pair Voltage Regulator with Soft-Start and Current Limit Circuitry

A technology of voltage regulators and regulators, which is applied in the direction of control/regulation systems, regulation of electrical variables, instruments, etc., and can solve problems such as difficulty in tracking the soft start of regulators

Active Publication Date: 2018-05-08
STMICROELECTRONICS CHINA INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But when the error amplifier of the tracking regulator uses an N-channel transistor, it is difficult to realize the soft start of the tracking regulator

Method used

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  • N-Channel Input-Pair Voltage Regulator with Soft-Start and Current Limit Circuitry
  • N-Channel Input-Pair Voltage Regulator with Soft-Start and Current Limit Circuitry
  • N-Channel Input-Pair Voltage Regulator with Soft-Start and Current Limit Circuitry

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Embodiment Construction

[0014] This document describes the subject matter of the invention with specificity required by law. However, the description itself is not intended to limit the scope of this patent. Indeed, the claimed subject matter may also be embodied in other ways or comprise different steps or combinations of steps similar to those described herein, combined with other present or future technologies.

[0015] As used herein, the terms "coupled", "connected" and "substantially" are defined as follows. The term "connect" is used to describe a direct connection between two circuit elements, for example by means of metal lines formed according to common integrated circuit fabrication techniques. In contrast, the term "coupled" is used to describe a direct or indirect connection between two circuit elements. For example, two coupled elements may be connected directly by means of metal lines, or indirectly by means of intervening circuit elements such as capacitors, resistors, inductors, or...

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Abstract

An N-channel input-pair voltage regulator with soft-start and current-limit circuitry, said voltage regulator, comprising two input pairs with opposite type transistors (P-type and N-type) to provide a soft-start function for Gradually increase the output voltage of the voltage regulator to the operating voltage from zero or a voltage below the threshold of the N-type transistor. The voltage regulator operates in a soft-start mode, where the variable voltage signal ramps up gradually to allow the output voltage to reach the operating voltage, and a normal operating mode, where the operating voltage is maintained.

Description

Background technique [0001] A voltage regulator provides a stable, nearly constant (regulated) supply voltage to a load, attempting to maintain the regulated supply voltage at a nearly constant value regardless of the load's current demand. Voltage regulators are used in complex electronic systems to regulate the supply voltage before it is provided to other circuit components. One of the many issues a circuit designer must evaluate is how the circuit design behaves when power is first applied. Unexpected events may occur at startup. Capacitors must be charged and all integrated circuits (ICs) changed from inactive to active states. Frequently, several voltage regulators provide power to the same circuit, and each voltage regulator must be in sequence when activated. Controlling the speed at which the voltage regulator's output voltage slews at start-up reduces stress on circuit components and allows a circuit designer to adjust the start-up voltage rate to a desired level ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/575G05F1/45G05F3/26
Inventor 崔正昊王飞蒋明
Owner STMICROELECTRONICS CHINA INVESTMENT
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