Device and method for increasing low voltage drop voltage-stabilizer compensation

A low-dropout voltage regulator and compensation circuit technology, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as structural instability of low-dropout voltage regulators, stability effects of low-dropout voltage regulators, etc.

Inactive Publication Date: 2006-11-08
O2MICRO CHINA
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  • Abstract
  • Description
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Problems solved by technology

However, due to the insertion of this compensation circuit, the stability of the LDO regulator is affected
Experiments have shown that under certain circumstances, especially when the capacitive load range is large and the output current is large, such an LDO structure is often unstable

Method used

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  • Device and method for increasing low voltage drop voltage-stabilizer compensation
  • Device and method for increasing low voltage drop voltage-stabilizer compensation
  • Device and method for increasing low voltage drop voltage-stabilizer compensation

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Embodiment Construction

[0017] In order to illustrate the principle of the present invention more clearly, it is necessary for us to study the reasons for the instability of the low dropout voltage regulator. LDO is a negative feedback system, so frequency compensation is required to ensure system stability. For a feedback system, three conditions must be met before we consider the system to be stable. First, according to the root locus theory of feedback systems, as long as a system has poles in the right half plane, the system is unstable. Then, a stable low-dropout voltage regulator must first have its poles and zeros in the left half-plane. Second, if the system's open-loop transfer function does not have sufficient phase margin, the output can also oscillate. To ensure the stability of the system, sufficient phase margin must be maintained, and generally we consider a system with a phase margin of less than 45 degrees to be unstable. Finally, to ensure the stability of the system, sufficient ...

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Abstract

This invention provides a low voltage-drop regulator including an error amplifier, a dynamic offset circuit, a drive circuit, a feed back circuit and a compensation circuit, in which, said low voltage-drop regulator also includes a zero generator, which can regulate the compensation condenser relatively to provide high efficient compesation when the load is rather big since the new structure of zero generator is added to provide an internal zero to the system so as to avoid the appearance of conjugate poles on the right half plane.

Description

technical field [0001] The invention relates to a compensation device and method for compensation of a low-drop voltage regulator, in particular to a compensation device and method for enhancing compensation of a low-drop voltage regulator. Background technique [0002] Nowadays, low-dropout voltage regulators (LDO) are more and more widely used in various electronic devices, and with the wide application of low-dropout voltage regulators, whether it is in design or in industrial production, our low-dropout The requirements for voltage regulators are also getting higher and higher. Among them, the stability of the low-dropout voltage regulator is very important, and its response speed and load range are also very important indicators. figure 1 A typical low-dropout regulator structure is shown. figure 2 Shown is a typical low dropout regulator circuit diagram. Usually, the most basic LDO voltage regulator is composed of an error amplifier 110 , a driving circuit 120 and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/10
Inventor 王伟汤小虎侯晓华
Owner O2MICRO CHINA
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