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A linear voltage stabilizing circuit, power supply module and portable electronic product

A linear regulator circuit and bias circuit technology, applied in the electronic field, can solve problems such as inability to output output voltage, low accuracy of output current limit, and fluctuation of linear regulator circuit current limit

Active Publication Date: 2020-12-11
SHANGHAI AWINIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in actual application and design, due to the influence of the channel modulation effect of the MOS tube, the accuracy of the output current limit is low.
The current ratio of MP02 tube and MP01 tube, and the current ratio of MN01 tube and MN02 tube will all have deviations due to the difference in source-drain voltage, which is no longer a constant, resulting in relatively large fluctuations in the current limit of the linear voltage regulator circuit. Unable to output stable output voltage

Method used

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  • A linear voltage stabilizing circuit, power supply module and portable electronic product
  • A linear voltage stabilizing circuit, power supply module and portable electronic product
  • A linear voltage stabilizing circuit, power supply module and portable electronic product

Examples

Experimental program
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Effect test

Embodiment 1

[0050] image 3 It is a circuit diagram of a linear voltage stabilizing circuit according to an embodiment of the present application.

[0051] Such as image 3 As shown, the linear voltage stabilizing circuit provided by this embodiment is applied to the power supply module or power supply chip of portable electronic products, and specifically includes the constant voltage output module 30, the second PMOS transistor MP2, the seventh PMOS transistor MP7, and the first NMOS transistor MN1 , a third NMOS transistor MN3 , a clamping circuit 10 , a dynamic bias circuit 20 and an output overcurrent protection modulation circuit 40 .

[0052] The constant voltage output module is provided with a reference voltage input terminal, a driving voltage input terminal, a conduction signal output terminal and a constant voltage output terminal VOUT, the reference voltage input terminal is used to receive the reference voltage VREF, and the driving voltage input terminal is used to receive...

Embodiment 2

[0073] This embodiment provides a power supply module, and the power supply module is provided with the linear voltage stabilizing circuit provided in the previous embodiment.

[0074] The linear regulator circuit specifically includes a second PMOS transistor, a seventh PMOS transistor, a first NMOS transistor, a third NMOS transistor, a clamping circuit, a dynamic bias circuit and an output overcurrent protection modulation circuit of the constant voltage output module. This solution is not affected by the channel modulation effect, and its current limiting value is closer to the design value, so that the current limiting accuracy and the stability of the current limiting value are higher, so that the linear voltage regulator circuit can output a stable output voltage.

[0075] The sampling current IP2 of the second PMOS tube flows into the first NMOS tube and the third NMOS tube of the stacked tube current mirror (cascode structure). This structure has a higher output impeda...

Embodiment 3

[0077] This embodiment provides a portable electronic product, which may be a notebook computer, a tablet computer, a mobile phone or other mobile terminals. The portable electronic product is provided with the power supply module provided in the previous embodiment, and the power supply module is provided with a linear voltage stabilizing circuit.

[0078] The linear regulator circuit specifically includes a second PMOS transistor, a seventh PMOS transistor, a first NMOS transistor, a third NMOS transistor, a clamping circuit, a dynamic bias circuit and an output overcurrent protection modulation circuit of the constant voltage output module. This solution is not affected by the channel modulation effect, and its current limiting value is closer to the design value, so that the current limiting accuracy and the stability of the current limiting value are higher, so that the linear voltage regulator circuit can output a stable output voltage.

[0079] The sampling current IP2 ...

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Abstract

The invention discloses a linear voltage stabilizing circuit, a power supply module and a portable electronic product. The linear voltage stabilizing circuit is applied to the power supply module of the portable electronic product, and concretely comprises a constant voltage output module, a second PMOS tube, a seventh PMOS tube, a first NMOS tube, a third NMOS tube, a clamping circuit, a dynamicbias circuit and an output overcurrent protection modulation circuit. The scheme has the advantages that the influence caused by a channel modulation effect is avoided; a current limiting value is closer to a design value, so that the current limiting precision and the stability of the current limiting value are higher; and the linear voltage stabilizing circuit can output stable output voltage.

Description

technical field [0001] The present application relates to the field of electronic technology, and more specifically, relates to a linear voltage stabilizing circuit, a power supply module and portable electronic products. Background technique [0002] With the increasing complexity of the functions of portable electronic products, its power supply module is required to be able to output a stable output voltage to ensure its normal operation. At present, in the power supply module of portable electronic products, the linear regulator circuit with low dropout output is widely used because of its advantages of low ripple, simple structure and high stability. [0003] A typical linear regulator circuit such as figure 1 As shown, MP01 is an output PMOS power transistor, which is used to convert input energy to output, and OAMP is an operational amplifier, whose function is to make V REF =V FB , that is, the output of the linear regulator circuit is V OUT =(R FB1 +R FB2 ) / R ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F1/26G05F1/575
CPCG05F1/575
Inventor 董渊孟威威程剑涛杜黎明孙洪军
Owner SHANGHAI AWINIC TECH CO LTD
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