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Voltage regulator

A voltage regulator, voltage technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problem of increasing the gate capacitance of the output transistor, and achieve the effect of large phase margin

Active Publication Date: 2020-11-27
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The voltage regulator designs the size of the output transistor to be larger in order to increase the output current, so the gate capacitance of the output transistor becomes larger

Method used

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no. 1 approach

[0031] figure 1 is a circuit diagram showing the voltage regulator of the first embodiment.

[0032] The voltage regulator 10 includes an input terminal 11, an output terminal 12, a ground terminal 13, a PMOS transistor 100 as an output transistor, resistors 101 and 102 constituting a feedback circuit, a capacitor 103 for phase compensation, and a reference voltage as a first reference voltage circuit. A circuit 104, an error amplifier 105, a resistor 106, a capacitor 107, a resistor 110 for phase compensation, a reference voltage circuit 120 as a second reference voltage circuit, and a PMOS transistor 130 as a first transistor. The reference voltage circuit 120 includes a current source 121 and PMOS transistors 122 and 123 . The reference voltage circuit 120, the PMOS transistor 130, the resistor 110 and the capacitor 103 constitute a phase compensation circuit.

[0033] The input terminal 11 of the voltage regulator 10 is connected to an external power supply, the output t...

no. 2 approach

[0089] Figure 5 is a circuit diagram showing the voltage regulator of the second embodiment.

[0090] The voltage regulator 20 is constructed as, in figure 1 In the voltage regulator 10, the reference voltage circuit 220 is used instead of the reference voltage circuits 104 and 120, and the elements constituting the phase compensation circuit are replaced with the PMOS transistor 201, the NMOS transistors 202 and 203, and the resistor 210. The reference voltage circuit 220 includes a current source 221 and NMOS transistors 222 and 223 . Additionally, for figure 1 The same components of the voltage regulator 10 are denoted by the same reference numerals, and repeated explanations are appropriately omitted.

[0091] The gate of the PMOS transistor 201 is connected to the gate of the PMOS transistor 100 , the source is connected to the input terminal 11 , and the drain is connected to the gate and drain of the NMOS transistor 202 and one terminal of the resistor 210 . The so...

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Abstract

The invention relates to a voltage regulator, and the voltage regulator includes an error amplifier which controls the gate of an output transistor so that a feedback voltage based on an output voltage of an output terminal matches a first reference voltage, a first transistor having a gate to which a second reference voltage is supplied, and a first resistor connected between the gate of the output transistor and the source of the first transistor. The first resistor functions as a resistance constituting a phase compensation circuit by a current flowing therethrough in response to a small output current of the output transistor.

Description

technical field [0001] The invention relates to a voltage regulator, in particular to a phase compensation circuit of the voltage regulator with a wide dynamic range of output current. Background technique [0002] In the voltage regulator, the size of the output transistor is designed to be large in order to increase the output current, so the gate capacitance of the output transistor becomes large. In addition, in order to stabilize the output voltage of the voltage regulator, a large-capacity capacitor is connected to the output terminal. The frequency of the pole in the phase-frequency characteristic is inversely proportional to the capacitance of the capacitor. Therefore, the two poles caused by these capacitance values ​​are located at low frequencies, within the frequency band of the gain-frequency characteristic of the negative feedback loop composed of the error amplifier, output transistor, and voltage-dividing resistors. Therefore, the voltage regulator uses a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56G05F1/59G05F1/575G05F1/10H02M3/156H02M1/08
Inventor 坂口薰
Owner SII SEMICONDUCTOR CORP
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