System for dynamically compensating phase margin of low dropout linear regulator

Abstract

A system for dynamically compensating phase margin of a low dropout linear regulator comprises a low dropout linear regulator, a detection circuit, a decision circuit, a load controllable circuit, a reference voltage input end and a voltage output end, wherein the low dropout linear regulator amplifies input reference voltage to a certain scale, and outputs the amplified voltage to the voltage output end; the detection circuit detects the voltage at the voltage output end as per a set standard, and outputs a detection result to the decision circuit; the decision circuit decides the detection result as per a certain regulation, and outputs a decision result to the load controllable circuit; the load controllable circuit performs corresponding load change to the decision result, so as to change the phase margin of the low dropout linear regulator. The system can dynamically detect the phase margin of the low dropout linear regulator, and performs real-time compensation, so as to avoid the stability problem in the low dropout linear regulator during dynamic response.

Description

technical field [0001] The invention relates to the technical field of dynamically compensating low-dropout linear regulators, and more particularly relates to a system capable of dynamically compensating its phase margin. Background technique [0002] When the load range of the existing low-dropout linear regulator is too large, its phase margin is difficult to meet the design requirements. Specifically, when the phase margin meets the requirements at large loads, it cannot meet the requirements at small loads. When the load meets the requirements, it cannot meet the requirements when the load is large, that is, the design of the phase margin is difficult to take into account the large load and the small load at the same time, and there is a compromise relationship. When the phase margin does not meet the requirements, its low-dropout linear regulator There will be instability in the regulator, which will seriously affect the performance of the low dropout linear regulator....

AI Technical Summary

Problems solved by technology

However, in practical applications, the load conditions of the low-dropout linear regulator are more and more complex and diverse, and its load will switch between large loads and small loads, resulting in a large output voltage of the low-dropout linear regulator. Fluctuations, even shocks, which will undoubtedly affect the normal operation of the load circuit

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