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Load transient response enhancement circuit applied to linear voltage regulator

A linear voltage regulator and load transient technology, applied in the physical field, can solve the problems of insufficient load transient response and easy instability of the system loop, so as to overcome the stability of the linear voltage regulator and overcome the load transient response Slower, guaranteed stability effect

Active Publication Date: 2017-06-27
XIDIAN UNIV
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Problems solved by technology

[0005] The object of the present invention is to propose a method applied to linear voltage regulators for the problem that the load transient response of the linear voltage regulator in the prior art is not fast enough and the system loop is easily unstable after the load transient response circuit is adopted. Load transient response enhancement circuit to improve its applicability in practical circuits

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] refer to figure 1 , the circuit structure of the present invention is described as follows.

[0018] The invention includes a voltage follower unit and a variable voltage unit.

[0019] The voltage follower unit includes a bias current device IBIAS, a first MOS transistor M1, a second MOS transistor M2,

[0020] The third MOS transistor M3 and the fourth MOS transistor M4.

[0021] The bias current I in the voltage follower unit BIAS One end of the power supply voltage V IN , the supply voltage V IN DC voltage is used, the range is 3V-6V, the other end is connected to the source of the first MOS transistor M1; the gate of the first MOS transistor M1 is connected to the reference voltage V ref , the bias voltage V ref DC voltage is used, the range is 1.4V-4V, the drain is connected to the drain of the third MOS transistor M3; the source of the second MOS t...

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Abstract

The invention discloses a load transient response enhancement circuit applied to a linear voltage regulator, and the problem that load transient response of the linear voltage regulator is not fast enough is mainly solved. The load transient response enhancement circuit is composed of a voltage follower unit and a variable reference voltage unit. First output voltages in the variable reference voltage unit and load currents are in negative correlation relationship to adjust a power tube of the linear voltage regulator, and the purpose of enhancing transient response is achieved.

Description

technical field [0001] The invention belongs to the technical field of physics, and further relates to a load transient response enhancing circuit applied to a linear voltage regulator in the technical field of electronic circuits. The invention can be used as an important part of the linear voltage stabilizer to improve the load transient response of the linear voltage stabilizer. Background technique [0002] With the development of integrated circuits and electronic technology, a large number of portable devices have become indispensable products in people's lives, among which linear voltage regulators are widely used due to their low cost, low noise and high precision. The load transient response is an important index of the linear voltage regulator, therefore, it is necessary to study the load transient response enhancement circuit of the linear voltage regulator. [0003] STMicroelectronics R&D Co., Ltd. (Shenzhen) discloses a method of improving the load regulation r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 李先锐赖彭宇吕春伟路建民刘栋赵永刚
Owner XIDIAN UNIV
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