A low-dropout linear regulator load transient response adjustment circuit

Abstract

The application provides a low-dropout linear regulator load transient response adjustment circuit, which comprises a low-dropout linear regulator, a driving module, a comparison module and a compensation module. The initial driving voltage output by the driving module enters the comparison module. The comparison module compares the initial driving voltage with a preset reference voltage and controls the working state of the compensation module based on the comparison result. When a load transient response occurs, the compensation module is in the working state and generates a compensation signal. The initial power supply signal is compensated based on the compensation signal to form a target power supply signal. When no load transient response occurs, the compensation module is in the non-working state, that is, no compensation signal is generated, and the initial power supply signal is the target power supply signal. The target power supply signal can make the target driving voltage output by the driving module the same as the normal working voltage of the driving module, thereby ensuring the normal working of the low-dropout linear regulator or the circuit powered by the driving module.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and more specifically, to an adjustment circuit for the load transient response of a low-dropout linear regulator. Background Technology

[0002] Low dropout linear regulators (LDOs) have advantages such as low cost, low noise, and low current, and are widely used in electronic equipment and communication systems to provide stable power supply voltage.

[0003] In practical applications, when the load current of a low-dropout linear regulator changes, the output voltage of the low-dropout linear regulator will also change, i.e., a load transient response will occur. For example, when the load current changes, the voltage at the output terminal of the low-dropout linear regulator will momentarily deviate from the set value range. If the output voltage at the output terminal deviates from the set value range, i.e., the load transient response does not meet the requirements, it may cause the circuit powering the low-dropout linear regulator to malfunction.

[0004] In existing technologies, the following two techniques are mainly used to improve the load transient response of low dropout linear regulators: the first technique is to optimize the internal circuit structure of the low dropout linear regulator; the second technique is to feed back the output voltage of the low dropout linear regulator to the low dropout linear regulator through a feedback circuit to regulate and control the final output voltage of the low dropout linear regulator. At present, the circuits of these existing technologies for improving the load transient response of low dropout linear regulators are relatively complex and it is difficult to meet the performance requirements.

[0005] Therefore, there is an urgent need for a low-dropout linear regulator load transient response adjustment circuit to solve the above problems. Summary of the Invention

[0006] In view of this, to solve the above problems, the present invention provides an adjustment circuit for the load transient response of a low dropout linear regulator, the technical solution of which is as follows:

[0007] A circuit for adjusting the load transient response of a low-dropout linear regulator, comprising: a low-dropout linear regulator, a drive module, a comparison module, and a compensation module.

[0008] The low-dropout linear regulator is used to provide an initial power signal to the drive module;

[0009] The driving module is used to provide an initial driving voltage based on the initial power signal;

[0010] The comparison module is used to compare the initial driving voltage with a preset reference voltage, and control the working state of the compensation module based on the comparison result. The preset reference voltage is determined based on the normal working voltage of the driving module.

[0011] When the compensation module is in operation, it outputs a compensation signal. Based on the compensation signal, the initial power signal is compensated to form a target power signal. The driving module provides a target driving voltage according to the target power signal.

[0012] Optionally, in the above-mentioned adjustment circuit for the transient response of the low-dropout linear regulator load, the initial power supply signal is a current signal;

[0013] The output terminal of the low-dropout linear regulator is connected to the input terminal of the drive module;

[0014] The output terminal of the drive module is the output terminal of the load transient response adjustment circuit of the low dropout linear regulator; the output terminal of the drive module is connected to the input terminal of the comparator module.

[0015] The output of the comparison module is connected to the input of the compensation module; the output of the compensation module is connected to the output of the low-dropout linear regulator.

[0016] Optionally, in the above-mentioned adjustment circuit for the transient response of the low-dropout linear regulator load, the compensation module includes:

[0017] First field-effect transistor and second field-effect transistor;

[0018] The first terminal of the first field-effect transistor is connected to the first operating voltage, the second terminal of the first field-effect transistor is connected to the first terminal of the second field-effect transistor, and the control terminal of the first field-effect transistor is connected to the control voltage;

[0019] The second terminal of the second field-effect transistor is connected to the output terminal of the low-dropout linear regulator; the control terminal of the second field-effect transistor is connected to the output terminal of the comparator module.

[0020] Optionally, in the above-mentioned adjustment circuit for the transient response of the low-dropout linear regulator load, the first field-effect transistor is a P-type field-effect transistor;

[0021] The second field-effect transistor is a P-type field-effect transistor.

[0022] Optionally, in the above-mentioned adjustment circuit for the transient response of the low-dropout linear regulator load, the initial power supply signal is a voltage signal;

[0023] The low-dropout linear regulator includes an amplifier unit;

[0024] The output terminal of the low dropout linear regulator is connected to the input terminal of the drive module; the output terminal of the drive module is connected to the input terminal of the comparator module; the output terminal of the comparator module is connected to the input terminal of the compensation module; and the output terminal of the compensation module is connected to the output terminal of the amplifier unit.

[0025] Optionally, in the above-mentioned adjustment circuit for the transient response of the low-dropout linear regulator load, the compensation module includes:

[0026] The third field-effect transistor; the first terminal of the third field-effect transistor is connected to the second operating voltage, the second terminal of the third field-effect transistor is connected to the output terminal of the amplifier unit; the control terminal of the third field-effect transistor is connected to the output terminal of the comparator module.

[0027] Optionally, in the above-mentioned adjustment circuit for the transient response of the low-dropout linear regulator load, the amplifier unit is an operational amplifier.

[0028] Optionally, in the above-mentioned adjustment circuit for the transient response of the low-dropout linear regulator load, the third field-effect transistor is a P-type field-effect transistor.

[0029] Optionally, in the above-described adjustment circuit for the transient response of the low-dropout linear regulator load, the drive module includes a driver;

[0030] The comparison module includes a voltage comparator.

[0031] Optionally, in the above-mentioned adjustment circuit for the transient response of the low-dropout linear regulator load, the output terminal of the driver is connected to an external circuit.

[0032] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0033] This invention provides an adjustment circuit for the transient response of a low-dropout linear regulator (LDL-LED) load. The circuit includes a LDL-LED, a drive module, a comparator module, and a compensation module. The LDL-LED provides an initial power signal to the drive module. The drive module provides an initial drive voltage based on the initial power signal. The comparator module compares the initial drive voltage with a preset reference voltage and controls the operation of the compensation module based on the comparison result. The preset reference voltage is determined based on the normal operating voltage of the drive module. When the compensation module is in operation, it outputs a compensation signal. The initial power signal is then compensated based on the compensation signal to form a target power signal. The drive module provides a target drive voltage based on the target power signal.

[0034] The initial drive voltage output by the drive module is input to the comparison module, which compares the initial drive voltage with a preset reference voltage. Since the preset reference voltage is determined based on the normal operating voltage of the drive module, the comparison result can be used to determine whether the compensation module needs to be activated. When a load transient response occurs, the compensation module is activated and generates a compensation signal. This compensation signal is used to compensate the initial power signal to form the target power signal. When no load transient response occurs, the compensation module is deactivated and does not generate a compensation signal. In other words, the output initial power signal is the target power signal. This target power signal ensures that the target drive voltage output by the drive module is the same as the normal operating voltage of the drive module, thereby guaranteeing the normal operation of the low-dropout linear regulator or the circuit powered by the drive module.

[0035] The adjustment circuit for the load transient response of this low dropout linear regulator is simpler than that of existing technologies. In addition, since the initial drive voltage signal output by the drive module is compared with the normal operating voltage of the drive module and then fed back to the low dropout linear regulator through the compensation module for compensation processing, the response speed during adjustment is faster than that of existing technologies. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of an adjustment circuit for the load transient response of a low-dropout linear regulator provided in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the structure of another low-dropout linear regulator load transient response adjustment circuit provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of a compensation module provided in an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the structure of an adjustment circuit for the load transient response of a low-dropout linear regulator provided in an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of another compensation module provided in an embodiment of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a load transient response adjustment circuit for a low dropout linear regulator provided in an embodiment of the present invention; the load transient response adjustment circuit for the low dropout linear regulator includes: a low dropout linear regulator 01, a drive module 02, a comparison module 03, and a compensation module 04.

[0045] The low-dropout linear regulator 01 is used to provide the initial power signal A to the drive module 02.

[0046] The drive module 02 is used to provide an initial drive voltage V1 based on the initial power signal A.

[0047] The comparison module 03 is used to compare the initial driving voltage V1 with a preset reference voltage, and control the working state of the compensation module 04 based on the comparison result X. The preset reference voltage is determined based on the normal working voltage of the driving module 02.

[0048] When the compensation module 04 is in working state, it outputs a compensation signal B. Based on the compensation signal B, the initial power signal A is compensated to form a target power signal C. The drive module 02 provides a target drive voltage V2 according to the target power signal C.

[0049] Specifically, the low-dropout linear regulator 01 serves as the power supply, providing an initial power signal A to the drive module 02. The drive module 02 generates an initial drive voltage V1 based on the initial power signal A.

[0050] When a load transient response occurs, the current of drive module 02 changes abruptly, and the initial power signal A output by low-dropout linear regulator 01 also changes. Consequently, the initial drive voltage V1 output by drive module 02 also changes, causing the circuit powered by either low-dropout linear regulator 01 or drive module 02 to malfunction. To ensure the normal operation of the circuit powered by either low-dropout linear regulator 01 or drive module 02, the drive voltage output by drive module 02 must be the same as its normal operating voltage. It should be noted that the normal operating voltage of drive module 02 is the drive voltage output by drive module 02 when no load transient response occurs.

[0051] In this invention, the initial drive voltage V1 output by the drive module 02 enters the comparison module 03. It should be noted that the comparison module 03 has a pre-designed reference voltage, which is determined based on the normal operating voltage of the drive module 02. That is, the reference voltage is set based on the normal operating voltage of the drive module 02 when no load transient response occurs. In this way, the comparison module 03 can compare the initial drive voltage V1 output by the drive module 02 when a load transient response occurs with the drive voltage output by the drive module 02 when no load transient response occurs. It should be noted that the comparison result X can be output in the form of a voltage signal.

[0052] The comparison result X is used to control the working state of the compensation module 04. In other words, the compensation module 04 can be in a working state or a non-working state based on the comparison result X.

[0053] When a load transient response occurs, the initial drive voltage V1 output by the drive module 02 is different from the preset reference voltage. In other words, the initial drive voltage V1 output by the drive module 02 is different from the normal operating voltage of the drive module 02. At this time, the compensation module 04 is in working state based on the comparison result X of the comparison module 03. The compensation module 04 generates a compensation signal B, which compensates the initial power signal A output by the low dropout linear regulator 01 to form a target power signal C. At this time, the drive module 02 generates a target drive signal V2 according to the target power signal C. The target drive signal V2 is the same as the drive voltage generated by the drive module 02 when no load transient response occurs. In other words, the target drive voltage V2 output by the drive module 02 at this time is the normal operating voltage of the drive module 02, thereby ensuring the normal operation of the circuit powered by the low dropout linear regulator 01 or the drive module 02.

[0054] When no load transient response occurs, the initial drive voltage V1 output by the drive module 02 is the same as the preset reference voltage. That is, the initial drive voltage V1 output by the drive module 02 is the same as the normal operating voltage of the drive module 02. At this time, the compensation module 04 is in a non-operating state based on the comparison result X of the comparison module 03, and the compensation module 04 will not generate the compensation signal B. The initial drive voltage V1 can ensure that the circuit powered by the low dropout linear regulator 01 or the drive module 02 works normally.

[0055] The adjustment circuit for the load transient response of this low dropout linear regulator is simpler than that of existing technologies. In addition, since the initial drive voltage signal output by the drive module is compared with the normal operating voltage of the drive module and then fed back to the low dropout linear regulator through the compensation module for compensation processing, the response speed during adjustment is faster than that of existing technologies.

[0056] Optionally, in another embodiment of the invention, reference is made to... Figure 2 , Figure 2 This is a schematic diagram of another low-dropout linear regulator load transient response adjustment circuit provided in an embodiment of the present invention; the initial power supply signal is a current signal I1.

[0057] The output terminal of the low-dropout linear regulator 01 is connected to the input terminal of the drive module 02.

[0058] The output terminal of the drive module 02 is the output terminal of the load transient response adjustment circuit of the low dropout linear regulator; the output terminal of the drive module 02 is connected to the input terminal of the comparison module 03.

[0059] The output of the comparison module 03 is connected to the input of the compensation module 04; the output of the compensation module 04 is connected to the output of the low-dropout linear regulator 01.

[0060] Specifically, in this embodiment, the initial power signal output by the low-dropout linear regulator 01 is a current signal I1. When a load transient response occurs, the current of the drive module 02 jumps, causing the initial drive voltage V1 output by the drive module 02 to change. At this time, the comparison module 03 compares the initial drive voltage V1 with a preset reference voltage, that is, the comparison module 03 compares the initial drive voltage V1 with the normal operating voltage of the drive module 02 to obtain a comparison result X. Since the initial drive voltage V1 changes, the comparison result X obviously controls the compensation module 04 to be in working state. That is, it is necessary to compensate the current signal I1 output by the low-dropout linear regulator 01. The compensation module 04 is in working state based on the comparison result X and provides a compensation signal, which is a current compensation signal I2. The current compensation signal I2 is added to the current signal I1 output by the low-dropout linear regulator 01 to obtain the target power signal, which is the target current signal I. C Target current signal I C The input from the input terminal of the drive module 02 compensates for the current required when the current of the drive module 02 jumps during the load transient response, so that the target drive voltage V2 output by the drive module 02 is the same as the drive voltage output by the drive module 02 when no load transient response occurs. Furthermore, it ensures that the circuit powered by the low dropout linear regulator 01 or the drive module 02 works normally.

[0061] It should be noted that when the initial power supply signal output by the low dropout linear regulator 01 is a current signal I1, the current compensation signal I2 output by the compensation module 04 can be set according to the current magnitude required for the current jump of the drive module 02 during the load transient response.

[0062] Optionally, in another embodiment of the invention, reference is made to... Figure 3 , Figure 3 This is a schematic diagram of the structure of a compensation module provided in an embodiment of the present invention; the compensation module 04 includes:

[0063] The first field-effect transistor P1 and the second field-effect transistor P2.

[0064] The first terminal of the first field-effect transistor P1 is connected to the first operating voltage V. dd1 The second terminal of the first field-effect transistor P1 is connected to the first terminal of the second field-effect transistor P2, and the control terminal of the first field-effect transistor P1 is connected to the control voltage V. bp connect.

[0065] The second terminal of the second field-effect transistor P2 is connected to the output terminal of the low-dropout linear regulator 01; the control terminal of the second field-effect transistor P2 is connected to the output terminal of the comparator module 03.

[0066] Optionally, in another embodiment of the present invention, the first field-effect transistor P1 is a P-type field-effect transistor.

[0067] The second field-effect transistor P2 is a P-type field-effect transistor.

[0068] Specifically, the first terminal of the first field-effect transistor P1 is the source, the second terminal of the first field-effect transistor P1 is the drain, and the control terminal of the first field-effect transistor P1 is the gate. The first terminal of the second field-effect transistor P2 is the source, the second terminal of the second field-effect transistor P2 is the drain, and the control terminal of the second field-effect transistor P2 is the gate.

[0069] First operating voltage V dd1 Provide operating voltage for the first field-effect transistor P1 and the second field-effect transistor P1, and control voltage V bp Used to control the switch of the first field-effect transistor P1.

[0070] Comparison module 03 compares the initial drive voltage V1 output by drive module 02 with a preset reference voltage. When a load transient response occurs, if the comparison result X between the initial drive voltage V1 output by drive module 02 and the preset reference voltage meets a preset condition, that is, the initial drive voltage V1 output by drive module 02 is different from the preset reference voltage, the first field-effect transistor P1 is turned on, and the second field-effect transistor P2 is also turned on. Compensation module 04 is in working state, and compensation module 04 provides... Figure 2 The current compensation signal I2 shown compensates for the current required by the current jump of the drive module 02 during load transient response, thereby ensuring that the target drive voltage V2 output by the drive module 02 is the same as the drive voltage output by the drive module 02 when no load transient response occurs. Furthermore, this ensures the normal operation of the circuit powering the low-dropout linear regulator 01 or the drive module 02. When no load transient response occurs, the comparison result X between the initial drive voltage V1 output by the drive module 02 and the preset reference voltage does not meet the preset condition; that is, the initial drive voltage V1 output by the drive module 02 does not meet the preset condition. When the reference voltage is the same, the second field-effect transistor P2 is not conducting. It should be noted that when the initial driving voltage V1 output by the driving module 02 is the same as the preset reference voltage, the first field-effect transistor P2 may or may not be conducting, without any specific limitation. At this time, the compensation module 04 is in a non-working state, that is, it does not generate a compensation signal. At this time, the initial driving voltage V1 generated by the driving module 02 is the same as the driving voltage output by the driving module 02 when no load transient response occurs, thereby ensuring that the circuit powered by the low dropout linear regulator 01 or the driving module 02 works normally.

[0071] Optionally, in another embodiment of the invention, reference is made to... Figure 4 , Figure 4This is a schematic diagram of the structure of another low-dropout linear regulator load transient response adjustment circuit provided in an embodiment of the present invention; the initial power supply signal is a voltage signal V. a .

[0072] The low-dropout linear regulator 01 includes an amplifier unit 05.

[0073] The output terminal of the low dropout linear regulator 01 is connected to the input terminal of the drive module 02; the output terminal of the drive module 02 is connected to the input terminal of the comparator module 03; the output terminal of the comparator module 03 is connected to the input terminal of the compensation module 04; and the output terminal of the compensation module 04 is connected to the output terminal of the amplifier unit 05.

[0074] Specifically, in this embodiment, the initial power supply signal output by the low-dropout linear regulator 01 is a voltage signal V. a When a load transient response occurs, the voltage signal V output by the low-dropout linear regulator 01... a The change causes the initial drive voltage V1 output by the drive module 02 to change. At this time, the comparison module 03 compares the initial drive voltage V1 with the preset reference voltage. In other words, the comparison module 03 compares the initial drive voltage V1 with the normal operating voltage of the drive module 02 to obtain the comparison result X. Since the initial drive voltage V1 changes, the comparison result X will obviously control the compensation module 04 to be in working state.

[0075] In order to make the voltage signal V output by the low dropout linear regulator 01 a To maintain stability, the voltage signal V output from amplifier unit 05 in the low-dropout linear regulator 01 needs to be adjusted. a Compensation is performed. The compensation module 04 is in working state based on the comparison result X and provides a compensation signal, which is a voltage compensation signal V. b The voltage compensation signal V b The input is to the low-dropout linear regulator 01. Since the output of the compensation module 04 is connected to the output of the amplifier unit 05 in the low-dropout linear regulator 01, the voltage compensation signal V... b The changing voltage signal V output from amplifier unit 05 in low dropout linear regulator 01 a Compensation was performed so that the target power signal input to the drive module 02 from the low-dropout linear regulator 01 and the voltage signal V output from the low-dropout linear regulator 01 were equal. 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, is... c The voltage signal V output by the low dropout linear regulator 01a This ensures that the target drive voltage V2 output by the drive module 02 is the same as the drive voltage output by the drive module 02 when no load transient response occurs, further guaranteeing the normal operation of the circuit powered by the low dropout linear regulator 01 or the drive module 02.

[0076] Optionally, in another embodiment of the present invention, the amplifier unit 05 is an operational amplifier.

[0077] Optionally, in another embodiment of the invention, reference is made to... Figure 5 , Figure 5 This is a schematic diagram of another compensation module provided in an embodiment of the present invention; the compensation module 04 includes:

[0078] The third field-effect transistor P3; the first terminal of the third field-effect transistor P3 is connected to the second operating voltage V. dd2 The second terminal of the third field-effect transistor P3 is connected to the output terminal of the amplifier unit 05; the control terminal of the third field-effect transistor P3 is connected to the output terminal of the comparator module 03.

[0079] Optionally, in another embodiment of the present invention, the third field-effect transistor P3 is a P-type field-effect transistor.

[0080] Specifically, the first terminal of the third field-effect transistor P3 is the source, the second terminal of the third field-effect transistor P3 is the drain, and the control terminal of the third field-effect transistor P3 is the gate.

[0081] Second working voltage V dd2 The third field-effect transistor P3 is provided with an operating voltage. When a load transient response occurs, the comparison result X between the initial drive voltage V1 output by the drive module 02 and the preset reference voltage meets the preset condition. That is, the initial drive voltage V1 output by the drive module 02 is different from the preset reference voltage. The third field-effect transistor P3 is turned on, the compensation module 04 is in working state, and the compensation module 04 provides the following: Figure 4 The voltage compensation signal V shown b This compensates for the changing voltage signal V output by amplifier unit 05 in the low-dropout linear regulator 01 during load transient response. a ', that is, it compensates for the low dropout linear regulator 01 holding voltage signal V aThe required voltage remains constant, ensuring that the target drive voltage V2 output by the drive module 02 is the same as the drive voltage output by the drive module 02 when no load transient response occurs. This further guarantees the normal operation of the circuit powered by the low-dropout linear regulator 01 or the drive module 02. When no load transient response occurs, the comparison result X between the initial drive voltage V1 output by the drive module 02 and the preset reference voltage does not meet the preset condition. In other words, the initial drive voltage V1 output by the drive module 02 is the same as the preset reference voltage, and the third field-effect transistor P3 is not turned on. At this time, the compensation module 04 is in a non-operating state, meaning no compensation signal is generated. The initial drive voltage V1 generated by the drive module 02 is the same as the drive voltage output by the drive module 02 when no load transient response occurs, thus ensuring the normal operation of the circuit powered by the low-dropout linear regulator 01 or the drive module 02.

[0082] Optionally, in another embodiment of the present invention, the driving module 02 includes a driver.

[0083] The comparison module 03 includes a voltage comparator.

[0084] Optionally, in another embodiment of the invention, the output of the driver is connected to an external circuit.

[0085] Specifically, the output terminal of the driver is the output terminal of the driver module 02. The output terminal of the driver is connected to the external circuit to provide the driving voltage to the external circuit. This driving voltage is the target driving voltage that is finally output to ensure that the circuit powering the driver module 02 can work normally.

[0086] The above provides a detailed description of the adjustment circuit for the load transient response of a low-dropout linear regulator provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

[0087] It should be noted that each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0088] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that elements inherent to a process, method, article, or apparatus that comprises a list of elements, or elements inherent to such processes, methods, articles, or apparatus, are also included. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0089] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not 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

1. A circuit for adjusting the transient response of a low-dropout linear regulator under load, characterized in that, The adjustment circuit for the load transient response of the low-dropout linear regulator includes: a low-dropout linear regulator, a drive module, a comparator module, and a compensation module. The output terminal of the low-dropout linear regulator is connected to the input terminal of the drive module. The output terminal of the drive module is the output terminal of the adjustment circuit for the load transient response of the low-dropout linear regulator. The output terminal of the drive module is connected to the input terminal of the comparator module. The output terminal of the comparator module is connected to the input terminal of the compensation module. The output terminal of the compensation module is connected to the output terminal of the low-dropout linear regulator. The low-dropout linear regulator is used to provide an initial power signal to the drive module; The driving module is used to provide an initial driving voltage based on the initial power signal; The comparison module is used to compare the initial driving voltage with a preset reference voltage, and control the working state of the compensation module based on the comparison result. The preset reference voltage is determined based on the normal working voltage of the driving module. When the compensation module is in operation, it outputs a compensation signal. Based on the compensation signal, the initial power signal is compensated to form a target power signal. The driving module provides a target driving voltage according to the target power signal.

2. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 1, characterized in that, The initial power signal is a current signal.

3. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 2, characterized in that, The compensation module includes: First field-effect transistor and second field-effect transistor; The first terminal of the first field-effect transistor is connected to the first operating voltage, the second terminal of the first field-effect transistor is connected to the first terminal of the second field-effect transistor, and the control terminal of the first field-effect transistor is connected to the control voltage; The second terminal of the second field-effect transistor is connected to the output terminal of the low-dropout linear regulator; the control terminal of the second field-effect transistor is connected to the output terminal of the comparator module.

4. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 3, characterized in that, The first field-effect transistor is a P-type field-effect transistor; The second field-effect transistor is a P-type field-effect transistor.

5. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 1, characterized in that, The initial power supply signal is a voltage signal; The low dropout linear regulator includes an amplifier unit, and the output terminal of the compensation module is connected to the output terminal of the amplifier unit.

6. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 5, characterized in that, The compensation module includes: The third field-effect transistor; the first terminal of the third field-effect transistor is connected to the second operating voltage, the second terminal of the third field-effect transistor is connected to the output terminal of the amplifier unit; the control terminal of the third field-effect transistor is connected to the output terminal of the comparator module.

7. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 5, characterized in that, The amplifier unit is an operational amplifier.

8. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 6, characterized in that, The third field-effect transistor is a P-type field-effect transistor.

9. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 1, characterized in that, The drive module includes a driver; The comparison module includes a voltage comparator.

10. The adjustment circuit for the load transient response of the low-dropout linear regulator according to claim 9, characterized in that, The output of the driver is connected to an external circuit.

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