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Low pressure drop voltage stabilizer for enhancing linearity and load regulation rate characteristic

A low-dropout voltage regulator and load regulation technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as poor linear regulation and load regulation, and achieve good linearity and load regulation Effect

Inactive Publication Date: 2009-01-28
HOLTEK SEMICON
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Therefore, the shortcoming of poor linear regulation rate when using N-type buffer must be solved; and when using P-type buffer, the shortcoming of poor load regulation rate, the circuit structure of the present invention provides a good solution

Method used

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  • Low pressure drop voltage stabilizer for enhancing linearity and load regulation rate characteristic
  • Low pressure drop voltage stabilizer for enhancing linearity and load regulation rate characteristic
  • Low pressure drop voltage stabilizer for enhancing linearity and load regulation rate characteristic

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Embodiment Construction

[0038] Now coordinate the following drawings to illustrate the detailed structure of the present invention and its connection relationship.

[0039] see Figure 4A Shown is a schematic diagram of the circuit structure of the low-dropout voltage regulator of the present invention using a complementary buffer for frequency compensation. The main structure includes: a reference voltage (Vref) circuit, an error amplifier (Error Amp), an output power transistor (Power Device ), the voltage buffer (Buffer) and the feedback circuit, the functions of each circuit component are described as follows:

[0040] The reference voltage circuit is used to provide a reference voltage; the error amplifier; the output power transistor is used to drive the load resistance (R L ); the feedback circuit is arranged between the error amplifier and the output power transistor, so that the error amplifier compares the reference voltage provided by the reference voltage circuit with the voltage provide...

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Abstract

The invention provides a low dropout voltage regulator which improving characteristics of line and load regulation, comprising a reference voltage circuit, a differential amplifier, an output power transistor, a feedback circuit and a voltage buffer, wherein the reference voltage circuit is used to provide reference voltage; the output power transistor is used to drive a load resistor; the feedback circuit is arranged between the differential amplifier and the output power transistor to make the differential amplifier compare the reference voltage with voltage provided by the feedback circuit and output error correction voltage; the voltage buffer is arranged between the differential amplifier and the output power transistor for carrying out the function of frequency compensation, and is formed by a complementary buffer. The low dropout voltage regulator can provide excellent line and load regulation.

Description

technical field [0001] The present invention relates to a low-dropout voltage regulator with improved linearity and load regulation characteristics, and in particular to an application of a complementary type buffer (Complementary Type Buffer) in the low-dropout voltage regulator to replace the traditional single-use N-type buffer When the regulator or P-type buffer is used, the problem of poor linearity or load regulation (Line and Load Regulation) occurs, which not only solves the problem of stability, but also improves the linearity and load regulation characteristics of the low-dropout voltage regulator. Background technique [0002] see figure 1 As shown, it is a schematic diagram of the circuit structure of an existing low dropout voltage regulator. A general low dropout voltage regulator (Low Dropout Regulator, LDO) includes: a reference voltage (Vref) circuit, an error amplifier (Error Amp), an output power transistor ( Power Device) and feedback circuit. In common...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 简铭宏
Owner HOLTEK SEMICON
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