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Low voltage difference linear voltage regulator circuit

A low dropout linear, voltage regulator technology, applied in the field of circuits, can solve problems such as poor LDO loop stability

Active Publication Date: 2017-05-10
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a low-dropout linear voltage regulator circuit, which solves the technical problem of poor stability of the LDO loop that can provide a large load current

Method used

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Embodiment Construction

[0018] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0019] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses a low voltage difference linear voltage regulator circuit. The circuit comprises: an error amplifier including a first input terminal, a second input terminal, a third input terminal and an output terminal; a first field effect transistor with a source electrode connected with the third input terminal; a buffer with an input terminal and an output terminal; and a voltmeter with one end connected with the first input terminal and the other end grounded. The input terminal of the buffer is connected with the output terminal of the error amplifier. The output terminal of the error amplifier is connected with a gate electrode of the first field effect transistor. The buffer is used to increase the corresponding frequency of a pole of a low voltage difference linear voltage regulator between the output terminal of the buffer and the gate electrode of the first field effect transistor to a preset frequency which is outside the frequency band of the low voltage difference linear voltage regulator. The circuit solves the technical problem that LDO loops capable of supplying large-load current are poor in stability.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a low-dropout linear regulator circuit. Background technique [0002] A low dropout regulator (LDO for short) is widely used in various modules that require stable power supply. It provides a stable voltage output and has a certain ability to suppress power supply noise. Since the LDO is a closed-loop structure, loop stability becomes an important factor to consider when designing the circuit. When the output load current is large, the size of the drive tube will be large, and the input capacitance of the drive tube will be large, resulting in a decrease in the frequency of the sub-pole or sub-main pole. Therefore, the frequency reduction of the sub-pole or sub-dominant pole due to P1 will seriously affect the loop stability. [0003] Such as figure 1 as shown, figure 1 Shows the structure of a traditional LDO. This circuit has two poles at VOUT and P1, and a zero due to ESR. The stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/56
CPCG01F1/56
Inventor 李健勋张亮
Owner GREE ELECTRIC APPLIANCES INC
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