Improved type low-dropout linear regulator

A low-dropout linear, voltage-stabilizer technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as low efficiency, low accuracy, and inability to boost voltage

Inactive Publication Date: 2016-07-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conduction device working in the switch state is called a DC-DC regulator, and the conduction device works in a linear state is called a linear regulator. They have their own advantages and disadvantages: the biggest advantage of the DC-DC regulator is high efficiency , can not only step

Method used

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  • Improved type low-dropout linear regulator
  • Improved type low-dropout linear regulator
  • Improved type low-dropout linear regulator

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Embodiment Construction

[0017] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] This embodiment proposes an improved low-dropout linear regulator design, such as figure 1 shown. Including: bandgap reference voltage source, CMOS two-stage error amplifier, adjustment tube, frequency compensation and feedback circuit. The bandgap reference voltage source circuit is connected to the CMOS two-stage error amplifier circuit; the CMOS two-stage error amplifier circuit is connected to the bandgap reference voltage source circuit, the feedback circuit and the adjustment tube circuit; the frequency compensation circuit The adjustment tube circuit is connected; the adjustment tube is connected to the feedback circuit. The bandgap reference voltage sourc...

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PUM

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Abstract

The invention discloses an improved low-dropout linear regulator, which comprises: a bandgap reference voltage source circuit, a CMOS two-stage error amplifier circuit, an adjustment tube, a frequency compensation circuit and a feedback circuit. The bandgap reference source circuit provides a voltage independent of the power supply voltage and ambient temperature; the bandgap reference voltage source circuit is connected to a CMOS two-stage error amplifier circuit; the CMOS two-stage error amplifier circuit is connected to a bandgap reference voltage source circuit and a feedback circuit and an adjustment tube; the frequency compensation circuit is connected to the adjustment tube; the adjustment tube is connected to the feedback circuit. The error amplification signal is generated by the CMOS two-stage error amplifier circuit; the adjustment tube is used to help feedback errors and reduce the voltage difference; the phase margin of the circuit is compensated by the frequency compensation circuit, including Miller compensation and ESR (Equivalent Series Resistance) compensation, so that it is relatively easy to meet the requirements of the phase margin; the feedback circuit is used to adjust the output voltage.

Description

technical field [0001] The invention relates to a linear regulator, in particular to a frequency compensation circuit and a bandgap reference circuit. Background technique [0002] A voltage stabilizer is a circuit that can stabilize the output voltage. It can automatically adjust the output voltage, stabilize the power supply voltage that fluctuates greatly or does not meet the working needs of the product within its set normal operating range, and provides a constant output voltage for the load. , so that the load can work normally under the rated working voltage. The low dropout linear regulator refers to the difference between the minimum input voltage and the stable output voltage. The smaller the difference, the larger the operating voltage range and the smaller the input requirements. [0003] From the perspective of technology, it mainly includes linear voltage regulators of bipolar technology, linear voltage regulators of CMOS technology and linear voltage regulato...

Claims

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Application Information

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IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor 李云鲲罗昕尚小京虞致国
Owner JIANGNAN UNIV
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