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A Fast Transient Response, High Stability Low Dropout Linear Regulator

A low-dropout linear and transient response technology, applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as adverse effects on stability and affecting the normal operation of subsequent circuit modules, so as to improve load transient response, Fast transient response capability, anti-oscillation effect

Inactive Publication Date: 2015-11-25
ZUNYI NORMAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the load current changes greatly, the secondary pole will change, and the ESR zero point cannot track the change of the pole very well, which will have a bad influence on the stability.
Moreover, if the output voltage overshoots or undershoots too much at the moment of the load current jump, it will directly affect the normal operation of the subsequent circuit modules.

Method used

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  • A Fast Transient Response, High Stability Low Dropout Linear Regulator
  • A Fast Transient Response, High Stability Low Dropout Linear Regulator
  • A Fast Transient Response, High Stability Low Dropout Linear Regulator

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] The low-dropout linear voltage regulator with fast transient response and high stability described in the present invention, its detailed technical scheme is as follows figure 2 As shown, it includes power adjustment tube MP, error amplifier circuit, ESR resistor, transient response improvement circuit and compensation network circuit. The error amplifier circuit includes a main operational amplifier circuit and a buffer drive circuit, the non-inverting input terminal of the main operational amplifier circuit is connected to the bandgap reference reference voltage Vref, and the inverting input terminal is connected to the output terminal of the low dropout linear regulator, The input end of the buffer drive circuit is connected to the output end of the main op-amp circuit, and the output end of the buffer drive circuit is connected to t...

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Abstract

The invention discloses a low dropout linear regulator with quick transient response and high stability. The low dropout linear regulator comprises a power adjusting pipe, an error amplifier circuit and an ESR resistor. The error amplifier circuit comprises a main operational amplifier circuit and a buffering drive circuit. The low dropout linear regulator further comprises a transient response improving circuit and a compensation network circuit. The low dropout linear regulator has the advantages that a compensation network is provided to guarantee that when load currents change, phase margin doe not change, and stability of the low dropout linear regulator is guaranteed; an induction capacitor is additionally arranged on the compensation network, so that change of poles can be quickly tracked, moment stability can be maintained when load current jump occurs, and oscillation of output voltages is prevented; a transient response improving circuit structure is designed to improve load transient response, it is guaranteed that output of the transient response improving circuit has quick transient response capacity when the load currents of the output end jump, and grain and the phase margin can not change greatly.

Description

technical field [0001] The present invention relates to the technical field of power management, in particular to the design of a low-dropout linear regulator (LDO, low-Dropout Regulator). Background technique [0002] Power management technology is widely used in electronic consumer products, especially in portable electronic products such as notebook computers, smart phones, and PDAs. The application of power management is mainly to achieve the purpose of prolonging battery life and chip working time by improving the energy utilization rate of devices. [0003] A low-dropout linear regulator (LDO) is a linear regulated source whose output voltage is lower than the input voltage. Its basic function is to provide a stable and reliable constant power supply voltage. Its advantages are low voltage drop, low power consumption, small package size, low output ripple, and simple application scheme. The output ripple of the LDO is small, it filters out the noise in the circuit, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 杨洁邹江李阳军杨友昌
Owner ZUNYI NORMAL COLLEGE
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