CN117608349A - Low dropout linear regulator load transient response's adjusting circuit - Google Patents

Low dropout linear regulator load transient response's adjusting circuit Download PDF

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Publication number
CN117608349A
CN117608349A CN202311464935.0A CN202311464935A CN117608349A CN 117608349 A CN117608349 A CN 117608349A CN 202311464935 A CN202311464935 A CN 202311464935A CN 117608349 A CN117608349 A CN 117608349A
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China
Prior art keywords
module
voltage
dropout linear
low dropout
compensation
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CN202311464935.0A
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Chinese (zh)
Inventor
郑慧
周安恺
许家榆
皮德义
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Newcosemi Beijing Technology Co ltd
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Newcosemi Beijing Technology Co ltd
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Priority to CN202311464935.0A priority Critical patent/CN117608349A/en
Publication of CN117608349A publication Critical patent/CN117608349A/en
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices

Abstract

The invention provides an adjusting circuit of load transient response of a low dropout linear voltage regulator, which comprises the low dropout linear voltage regulator, a driving module, a comparison module and a compensation module, wherein initial driving voltage output by the driving module enters the comparison module, the comparison module compares the initial driving voltage with preset reference voltage and controls the working state of the compensation module based on the comparison result, and when the load transient response occurs, the compensation module is in the working state and generates a compensation signal, and compensation processing is carried out on the initial power signal based on the compensation signal to form a target power signal; when no load transient response occurs, the compensation module is in a non-working state, namely no compensation signal is generated, and the output initial power supply signal is the target power supply signal; the target power supply signal can enable the target driving voltage output by the driving module to be the same as the normal working voltage of the driving module, so that the low dropout linear voltage regulator or a circuit powered by the driving module can work normally.

Description

Low dropout linear regulator load transient response's adjusting circuit
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a low-dropout linear regulator load transient response adjusting circuit.
Background
The low dropout linear regulator (LDO) has the advantages of low cost, low noise, small current and the like, and is widely applied to electronic equipment and communication systems for providing stable power supply voltage.
In practical application, when the load current of the low dropout linear voltage regulator jumps, the output voltage of the low dropout linear voltage regulator also changes, namely load transient response is generated; for example, when the load absorbs current and jumps, the voltage at the output end of the low dropout linear voltage regulator instantaneously deviates from the set value range, and if the output voltage at the output end deviates from the set value range, that is, the transient response of the load does not meet the requirement, the circuit powered by the low dropout linear voltage regulator may work abnormally.
In the prior art, the following two techniques are mainly adopted to improve the load transient response of the low dropout linear voltage regulator: the first technique is to optimize the circuit structure inside the low dropout linear regulator; the second technology is to feed back the output voltage of the low dropout linear voltage regulator to the low dropout linear voltage regulator through a feedback circuit to regulate and control the final output voltage of the low dropout linear voltage regulator; at present, circuits for improving load transient response of the low-dropout linear voltage regulator in the prior art are complex, and performance requirements are difficult to achieve.
Therefore, a circuit for adjusting the load transient response of a low dropout linear regulator is needed to solve the above problems.
Disclosure of Invention
In view of the above, the present invention provides a low dropout linear regulator load transient response adjusting circuit, which has the following technical scheme:
an adjusting circuit of a low dropout linear regulator load transient response, the adjusting circuit of the low dropout linear regulator load transient response comprising: the device comprises a low dropout linear voltage regulator, a driving module, a comparison module and a compensation module;
the low dropout linear regulator is used for providing an initial power supply signal for the driving module;
the driving module is used for providing an initial driving voltage according to the initial power supply signal;
the comparison module is used for comparing the initial driving voltage with a preset reference voltage and controlling the working state of the compensation module based on a comparison result, and the preset reference voltage is determined based on the normal working voltage of the driving module;
when the compensation module is in a working state, a compensation signal is output, compensation processing is carried out on the initial power supply signal based on the compensation signal to form a target power supply signal, and the driving module provides a target driving voltage according to the target power supply signal.
Optionally, in the adjusting circuit of the low dropout linear regulator load transient response, the initial power supply signal is a current signal;
the output end of the low dropout linear voltage regulator is connected with the input end of the driving module;
the output end of the driving module is the output end of the adjusting circuit of the low-dropout linear voltage regulator load transient response; the output end of the driving module is connected with the input end of the comparison module;
the output end of the comparison module is connected with the input end of the compensation module; and the output end of the compensation module is connected with the output end of the low dropout linear voltage regulator.
Optionally, in the foregoing low dropout linear regulator load transient response adjusting circuit, the compensation module includes:
the first field effect transistor and the second field effect transistor;
the first end of the first field effect tube is connected with a first working voltage, the second end of the first field effect tube is connected with the first end of the second field effect tube, and the control end of the first field effect tube is connected with a control voltage;
the second end of the second field effect tube is connected with the output end of the low dropout linear voltage regulator; and the control end of the second field effect transistor is connected with the output end of the comparison module.
Optionally, in the adjusting circuit of the low dropout linear regulator load transient response, the first field effect transistor is a P-type field effect transistor;
the second field effect transistor is a P-type field effect transistor.
Optionally, in the adjusting circuit of the low dropout linear regulator load transient response, the initial power supply signal is a voltage signal;
the low dropout linear regulator includes an amplifier unit;
the output end of the low dropout linear voltage regulator is connected with the input end of the driving module; the output end of the driving module is connected with the input end of the comparison module; the output end of the comparison module is connected with the input end of the compensation module; the output end of the compensation module is connected with the output end of the amplifier unit.
Optionally, in the foregoing low dropout linear regulator load transient response adjusting circuit, the compensation module includes:
a third field effect transistor; the first end of the third field effect tube is connected with the second working voltage, and the second end of the third field effect tube is connected with the output end of the amplifier unit; and the control end of the third field effect transistor is connected with the output end of the comparison module.
Optionally, in the low dropout linear regulator load transient response adjusting circuit, the amplifier unit is an operational amplifier.
Optionally, in the adjusting circuit for load transient response of a low dropout linear regulator, the third fet is a P-type fet.
Optionally, in the adjusting circuit of the low dropout linear regulator load transient response, the driving module includes a driver;
the comparison module includes a voltage comparator.
Optionally, in the low dropout linear regulator load transient response adjusting circuit, an output terminal of the driver is connected to an external circuit.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an adjusting circuit of the transient response of a load of a low dropout linear voltage regulator, which comprises the low dropout linear voltage regulator, a driving module, a comparison module and a compensation module, wherein the low dropout linear voltage regulator is used for providing an initial power supply signal for the driving module; the driving module is used for providing an initial driving voltage according to an initial power supply signal; the comparison module is used for comparing the initial driving voltage with a preset reference voltage, controlling the working state of the compensation module based on a comparison result, and determining the preset reference voltage based on the normal working voltage of the driving module; when the compensation module is in a working state, a compensation signal is output, compensation processing is carried out on the initial power supply signal based on the compensation signal to form a target power supply signal, and the driving module provides a target driving voltage according to the target power supply signal.
The initial driving voltage output by the driving module is input into the comparison module, and the comparison module compares the initial driving voltage output by the driving module with a preset reference voltage, and because the preset reference voltage is determined based on the normal working voltage of the driving module, whether the compensation module is in a working state or not can be confirmed according to the comparison result of the initial driving voltage and the preset reference voltage. When load transient response occurs, the compensation module is in a working state, the compensation module generates a compensation signal, and compensation processing is carried out on the initial power supply signal based on the compensation signal to form a target power supply signal; when no load transient response occurs, the compensation module is in a non-working state, and the compensation module does not generate a compensation signal, that is, the output initial power supply signal is the target power supply signal; the target power supply signal can enable the target driving voltage output by the driving module to be the same as the normal working voltage of the driving module, so that the low dropout linear voltage regulator or a circuit powered by the driving module can work normally.
Compared with the prior art, the low-dropout linear voltage regulator load transient response adjusting circuit has simpler structure, and in addition, the response speed is faster in adjustment compared with the prior art because the initial driving voltage signal output by the driving module is compared with the normal working voltage of the driving module and then fed back to the low-dropout linear voltage regulator for compensation processing through the compensation module.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an adjusting circuit for load transient response of a low dropout linear regulator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another low dropout linear regulator load transient response adjustment circuit according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a compensation module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a load transient response adjustment circuit of a low dropout linear regulator according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another compensation module according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an adjusting circuit for load transient response of a low dropout linear regulator according to an embodiment of the present invention; the low dropout linear regulator load transient response adjusting circuit comprises: a low dropout linear regulator 01, a driving module 02, a comparing module 03 and a compensating module 04.
The low dropout linear regulator 01 is configured to provide an initial power supply signal a to the driving module 02.
The driving module 02 is used for providing an initial driving voltage V according to the initial power signal A 1 。
The comparison module 03 is configured to generate the initial driving voltage V 1 Comparing the operation state of the compensation module 04 with a preset reference voltage, and controlling the operation state of the compensation module 04 based on a comparison result X, wherein the preset reference voltage is determined based on the normal operation voltage of the driving module 02.
When the compensation module 04 is in a working state, a compensation signal B is output, the initial power supply signal a is compensated based on the compensation signal B to form a target power supply signal C, and the driving module 02 provides a target driving voltage V according to the target power supply signal C 2 。
Specifically, the low dropout linear regulator 01 is used as a power supply to provide an initial power supply signal a for the driving module 02, and the driving module 02 generates an initial driving voltage V based on the initial power supply signal a 1 。
When a load transient response occurs, the current of the driving module 02 jumps, the initial power supply signal A output by the low dropout linear regulator 01 also changes, and based on the initial driving voltage V output by the driving module 02 1 The voltage of the low dropout linear regulator 01 or the circuit powered by the driving module 02 cannot work normally, and in order to ensure the normal work of the low dropout linear regulator 01 or the circuit powered by the driving module 02, the driving voltage output by the driving module 02 needs to be the same as the normal work voltage of the driving module 02. It should be noted that, the normal operating voltage of the driving module 02 is the driving voltage output by the driving module 02 when no load transient response occurs.
The initial driving voltage V output by the driving module 02 in the invention 1 Entering a comparison module 03; the comparison module 03 has a pre-designed parameterThe reference voltage is determined according to the normal operation voltage of the driving module 02, that is, the reference voltage is set according to the normal operation voltage of the driving module 02 when no load transient response occurs, so that the comparison module 03 can compare the initial driving voltage V output by the driving module 02 when the load transient response occurs 1 It should be noted that, when comparing the driving voltage output by the driving module 02 in response to the load transient state, the comparison result X may be output in the form of a voltage signal.
The comparison result X is used to control the operating state of the compensation module 04, i.e. the compensation module 04 can be in an operating state or in an inactive state based on the comparison result X.
When a load transient response occurs, the initial driving voltage V output by the driving module 02 1 Different from the preset reference voltage, that is, the initial driving voltage V output by the driving module 02 1 At this time, the compensation module 04 is in an operating state based on the comparison result X of the comparison module 03, the compensation module 04 generates a compensation signal B for compensating the initial power signal A outputted from the LDO 01 to form a target power signal C, and the driving module 02 generates a target driving signal V according to the target power signal C 2 The target driving signal V 2 The same as the driving voltage generated by the driving module 02 in response to no load transient, that is, the target driving voltage V output by the driving module 02 at this time 2 The normal working voltage of the driving module 02 is obtained, so that the normal working of the low-dropout linear regulator 01 or a circuit powered by the driving module 02 is ensured.
When no load transient response occurs, the initial driving voltage V output by the driving module 02 1 The same as the preset reference voltage, that is, the initial driving voltage V output by the driving module 02 1 At this time, the compensation module 04 is in a non-operating state based on the comparison result X of the comparison module 03, the compensation module 04 does not generate the compensation signal B, the initial driving voltage V 1 Low differential pressure linearity can be ensuredThe circuit powered by the voltage regulator 01 or the driving module 02 works normally.
Compared with the prior art, the low-dropout linear voltage regulator load transient response adjusting circuit has simpler structure, and in addition, the response speed is faster in adjustment compared with the prior art because the initial driving voltage signal output by the driving module is compared with the normal working voltage of the driving module and then fed back to the low-dropout linear voltage regulator for compensation processing through the compensation module.
Optionally, in another embodiment of the present invention, referring to fig. 2, fig. 2 is a schematic structural diagram of another low dropout linear regulator load transient response adjusting circuit according to an embodiment of the present invention; the initial power supply signal is a current signal I 1 。
The output end of the low dropout linear regulator 01 is connected with the input end of the driving module 02.
The output end of the driving module 02 is the output end of the adjusting circuit of the low dropout linear regulator load transient response; the output end of the driving module 02 is connected with the input end of the comparing module 03.
The output end of the comparison module 03 is connected with the input end of the compensation module 04; the output end of the compensation module 04 is connected with the output end of the low dropout linear voltage stabilizer 01.
Specifically, in this embodiment, the initial power signal output by the low dropout linear regulator 01 is a current signal I 1 When a load transient response occurs, the current of the driving module 02 jumps, so that the initial driving voltage V output by the driving module 02 1 The comparison module 03 changes according to the initial driving voltage V 1 Compared with a preset reference voltage, that is, the comparison module 03 is based on the initial driving voltage V 1 Comparing with the normal operating voltage of the driving module 02 to obtain a comparison result X due to the initial driving voltage V 1 The comparison result X obviously controls the compensation module 04 to be in an operating state, that is, the current signal I output by the low dropout linear regulator 01 is needed 1 Compensation is performed by the compensation module 04 based on the comparison junctionIf X is in operation, providing a compensation signal which is a current compensation signal I 2 The current compensation signal I 2 With the current signal I output by the low dropout linear voltage regulator 01 1 Adding to obtain a target power supply signal, which is a target current signal I C Target current signal I C The current required by the current jump of the driving module 02 when the load transient response is compensated by the input of the driving module 02, thereby leading the target driving voltage V output by the driving module 02 2 The same as the driving voltage output by the driving module 02 when no load transient response occurs, further, the normal operation of the low dropout linear regulator 01 or the circuit powered by the driving module 02 is ensured.
It should be noted that, the initial power signal output by the low dropout linear regulator 01 is a current signal I 1 At this time, the compensation module 04 outputs a current compensation signal I 2 The setting may be made according to the current level required for the current jump of the driving module 02 at the load transient response.
Optionally, in another embodiment of the present invention, referring to fig. 3, fig. 3 is a schematic structural diagram of a compensation module according to an embodiment of the present invention; the compensation module 04 includes:
first field effect transistor P 1 And a second field effect transistor P 2 。
The first field effect transistor P 1 And a first end of (2) and a first operating voltage V dd1 Is connected with the first field effect transistor P 1 Is connected with the first end of the second field effect tube P2, the first field effect tube P 1 Control terminal of (2) and control voltage V bp And (5) connection.
The second field effect transistor P 2 The second end of the low dropout linear regulator 01 is connected with the output end of the low dropout linear regulator; the second field effect transistor P 2 Is connected to the output of the comparison module 03.
Optionally, in another embodiment of the present invention, the first fet P 1 Is a P-type field effect transistor.
The second field effect transistor P 2 Is a P-type field effect transistor.
Specifically, a first field effect transistor P 1 A first end of (1) is a source electrode, a first field effect transistor P 1 The second end of (a) is a drain electrode, and the first field effect transistor P 1 The control end of (2) is a grid electrode, and the second field effect transistor P 2 A first end of (a) is a source electrode, a second field effect transistor P 2 A second end of (2) is a drain electrode, a second field effect transistor P 2 The control terminal of (2) is a gate.
First working voltage V dd1 Is a first field effect transistor P 1 And a second field effect transistor P 1 Providing an operating voltage, a control voltage V bp For controlling the first FET P 1 Is provided.
The comparison module 03 outputs an initial driving voltage V to the driving module 02 1 Comparing with a preset reference voltage; when a load transient response occurs, the initial driving voltage V output by the driving module 02 1 The comparison result X with the preset reference voltage satisfies the preset condition, that is, the initial driving voltage V output by the driving module 02 1 Different from the preset reference voltage, the first field effect transistor P 1 Conducting and second field effect transistor P 2 Also on, the compensation module 04 is in operation, and the compensation module 04 provides a current compensation signal I as shown in fig. 2 2 The current required by the driving module 02 during current jump when the transient response of the load is compensated, so that the target driving voltage V output by the driving module 02 2 The driving voltage output by the driving module 02 is the same as the driving voltage output by the driving module 02 when no load transient response occurs, and further, the normal operation of a circuit powered by the low-dropout linear voltage regulator 01 or the driving module 02 is ensured; when no load transient response occurs, the initial driving voltage V output by the driving module 02 1 The comparison result X with the preset reference voltage does not satisfy the preset condition, that is, the initial driving voltage V output by the driving module 02 1 The second FET P is the same as the preset reference voltage 2 Non-conduction, it should be noted that the initial driving voltage V output by the driving module 02 1 When the reference voltage is the same as the preset reference voltage, the first FET P 2 May or may not be in a conductive stateThe state is not particularly limited, and the compensation module 04 is in a non-operating state, that is, no compensation signal is generated, and the initial driving voltage V generated by the driving module 02 1 The driving voltage output by the driving module 02 is the same as the driving voltage output by the driving module 02 when no load transient response occurs, so that the normal operation of the low dropout linear voltage regulator 01 or a circuit powered by the driving module 02 is ensured.
Optionally, in another embodiment of the present invention, referring to fig. 4, fig. 4 is a schematic structural diagram of a load transient response adjusting circuit of a low dropout linear regulator according to an embodiment of the present invention; the initial power supply signal is a voltage signal V a 。
The low dropout linear regulator 01 includes an amplifier unit 05.
The output end of the low dropout linear voltage regulator 01 is connected with the input end of the driving module 02; the output end of the driving module 02 is connected with the input end of the comparison module 03; the output end of the comparison module 03 is connected with the input end of the compensation module 04; the output of the compensation module 04 is connected to the output of the amplifier unit 05.
Specifically, in this embodiment, the initial power signal output by the low dropout linear regulator 01 is a voltage signal V a When load transient response occurs, the voltage signal V output by the low dropout linear regulator 01 a Changes to make the initial driving voltage V output by the driving module 02 1 The comparison module 03 changes according to the initial driving voltage V 1 Compared with a preset reference voltage, that is, the comparison module 03 is based on the initial driving voltage V 1 Comparing with the normal operation voltage of the driving module 02 to obtain a comparison result X due to the initial driving voltage V 1 It is clear that the comparison result X will control the compensation module 04 to be in operation.
In order to make the voltage signal V output by the low dropout linear regulator 01 a To be stable, a voltage signal V is required to be changed in output from an amplifier unit 05 in a low dropout linear regulator 01 a ' Compensation, compensation Module 04 is in operation based on comparison result X and providesA compensation signal, which is a voltage compensation signal V b The voltage compensation signal V b The input low dropout linear regulator 01 is connected with the output end of the compensation module 04 and the output end of the amplifier unit 05 in the low dropout linear regulator 01, so that the voltage compensation signal V b For the voltage signal V which is output by the amplifier unit 05 in the low dropout linear regulator 01 and is changed a ' compensate so that the target power signal input to the driving module 02 by the low dropout linear regulator 01 and the voltage signal V output by the low dropout linear regulator 01 a The same, that is, when the voltage compensation signal V b After compensation, the target power supply signal output by the low dropout linear regulator 01, i.e. the target voltage signal V c And the voltage signal V output by the low dropout linear voltage regulator 01 a The target driving voltage V2 output by the driving module 02 is the same as the driving voltage output by the driving module 02 when no load transient response occurs, and further, the low-dropout linear voltage regulator 01 or a circuit powered by the driving module 02 can work normally.
Alternatively, in another embodiment of the present invention, the amplifier unit 05 is an operational amplifier.
Optionally, in another embodiment of the present invention, referring to fig. 5, fig. 5 is a schematic structural diagram of another compensation module provided in an embodiment of the present invention; the compensation module 04 includes:
third field effect transistor P 3 The method comprises the steps of carrying out a first treatment on the surface of the The first end of the third FET P3 and the second operating voltage V dd2 Is connected with the third field effect transistor P 3 Is connected to the output of the amplifier unit 05; the third field effect transistor P 3 Is connected to the output of the comparison module 03.
Optionally, in another embodiment of the present invention, the third fet P 3 Is a P-type field effect transistor.
Specifically, a third field effect transistor P 3 A first end of the third field effect transistor P is a source electrode 3 The second end of the transistor is a drain electrode, and the third field effect transistor P 3 The control terminal of (2) is a gate.
Second working voltage V dd2 Is a third field effect transistor P 3 Providing an operating voltage, and when a load transient response occurs, outputting an initial driving voltage V by the driving module 02 1 The comparison result X with the preset reference voltage satisfies the preset condition, that is, the initial driving voltage V output by the driving module 02 1 Different from the preset reference voltage, the third FET P 3 On, the compensation module 04 is in an operating state, and the compensation module 04 provides a voltage compensation signal V as shown in fig. 4 b Compensating for load transient response, the voltage signal V of the low dropout linear regulator 01, which is output by the amplifier unit 05 and changes a ' i.e. compensating for the holding voltage signal V of the low dropout linear regulator 01 a The required voltage is unchanged, so that the target driving voltage V output by the driving module 02 2 The driving voltage output by the driving module 02 is the same as the driving voltage output by the driving module 02 when no load transient response occurs, and further, the normal operation of a circuit powered by the low-dropout linear voltage regulator 01 or the driving module 02 is ensured; when no load transient response occurs, the initial driving voltage V output by the driving module 02 1 The comparison result X with the preset reference voltage does not satisfy the preset condition, that is, the initial driving voltage V output by the driving module 02 1 The third FET P is the same as the preset reference voltage 3 Is not conductive, and the compensation module 04 is in a non-working state, that is, no compensation signal is generated, and the initial driving voltage V generated by the driving module 02 1 The driving voltage output by the driving module 02 is the same as the driving voltage output by the driving module 02 when no load transient response occurs, so that the normal operation of the low dropout linear voltage regulator 01 or a circuit powered by the driving module 02 is ensured.
Optionally, in another embodiment of the present invention, the driving module 02 includes a driver.
The comparison module 03 comprises a voltage comparator.
Alternatively, in another embodiment of the present invention, the output terminal of the driver is connected to an external circuit.
Specifically, the output end of the driver is the output end of the driving module 02, and the output end of the driver is connected with an external circuit and used for providing driving voltage for the external circuit, wherein the driving voltage is the final output target driving voltage capable of ensuring the normal operation of the circuit powered by the driving module 02.
The foregoing has described in detail the load transient response adjusting circuit of the low dropout linear regulator provided by the present invention, and specific examples have been applied herein to illustrate the principles and embodiments of the present invention, the above examples being provided only to assist in understanding the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
It should be noted that, in each embodiment, the differences from the other embodiments are emphasized, and the same similar parts between the embodiments are referred to each other.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include, or is intended to include, elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An adjusting circuit for load transient response of a low dropout linear voltage regulator, characterized in that the adjusting circuit for load transient response of the low dropout linear voltage regulator comprises: the device comprises a low dropout linear voltage regulator, a driving module, a comparison module and a compensation module;
the low dropout linear regulator is used for providing an initial power supply signal for the driving module;
the driving module is used for providing an initial driving voltage according to the initial power supply signal;
the comparison module is used for comparing the initial driving voltage with a preset reference voltage and controlling the working state of the compensation module based on a comparison result, and the preset reference voltage is determined based on the normal working voltage of the driving module;
when the compensation module is in a working state, a compensation signal is output, compensation processing is carried out on the initial power supply signal based on the compensation signal to form a target power supply signal, and the driving module provides a target driving voltage according to the target power supply signal.
2. The low dropout linear regulator load transient response adjustment circuit according to claim 1, wherein said initial power supply signal is a current signal;
the output end of the low dropout linear voltage regulator is connected with the input end of the driving module;
the output end of the driving module is the output end of the adjusting circuit of the low-dropout linear voltage regulator load transient response; the output end of the driving module is connected with the input end of the comparison module;
the output end of the comparison module is connected with the input end of the compensation module; and the output end of the compensation module is connected with the output end of the low dropout linear voltage regulator.
3. The low dropout linear regulator load transient response adjustment circuit according to claim 2, wherein said compensation module comprises:
the first field effect transistor and the second field effect transistor;
the first end of the first field effect tube is connected with a first working voltage, the second end of the first field effect tube is connected with the first end of the second field effect tube, and the control end of the first field effect tube is connected with a control voltage;
the second end of the second field effect tube is connected with the output end of the low dropout linear voltage regulator; and the control end of the second field effect transistor is connected with the output end of the comparison module.
4. The low dropout linear regulator load transient response adjustment circuit of claim 3, wherein said first fet is a P-fet;
the second field effect transistor is a P-type field effect transistor.
5. The low dropout linear regulator load transient response adjustment circuit according to claim 1, wherein said initial power supply signal is a voltage signal;
the low dropout linear regulator includes an amplifier unit;
the output end of the low dropout linear voltage regulator is connected with the input end of the driving module; the output end of the driving module is connected with the input end of the comparison module; the output end of the comparison module is connected with the input end of the compensation module; the output end of the compensation module is connected with the output end of the amplifier unit.
6. The low dropout linear regulator load transient response adjustment circuit according to claim 5, wherein said compensation module comprises:
a third field effect transistor; the first end of the third field effect tube is connected with the second working voltage, and the second end of the third field effect tube is connected with the output end of the amplifier unit; and the control end of the third field effect transistor is connected with the output end of the comparison module.
7. The low dropout linear regulator load transient response adjustment circuit according to claim 5, wherein said amplifier unit is an operational amplifier.
8. The low dropout linear regulator load transient response adjustment circuit of claim 6, wherein said third fet is a P-fet.
9. The low dropout linear regulator load transient response adjustment circuit according to claim 1, wherein said drive module includes a driver;
the comparison module includes a voltage comparator.
10. The low dropout linear regulator load transient response adjustment circuit according to claim 9, wherein an output terminal of said driver is connected to an external circuit.
CN202311464935.0A 2023-11-06 2023-11-06 Low dropout linear regulator load transient response's adjusting circuit Pending CN117608349A (en)

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Application Number Priority Date Filing Date Title
CN202311464935.0A CN117608349A (en) 2023-11-06 2023-11-06 Low dropout linear regulator load transient response's adjusting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311464935.0A CN117608349A (en) 2023-11-06 2023-11-06 Low dropout linear regulator load transient response's adjusting circuit

Publications (1)

Publication Number Publication Date
CN117608349A true CN117608349A (en) 2024-02-27

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Application Number Title Priority Date Filing Date
CN202311464935.0A Pending CN117608349A (en) 2023-11-06 2023-11-06 Low dropout linear regulator load transient response's adjusting circuit

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