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Stabilizer

A technology of voltage stabilizer and offset voltage, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, etc., which can solve problems such as difficult movements and achieve the effect of stable movements

Active Publication Date: 2022-04-08
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the conventional voltage regulator, the source-drain voltage Vds of the auxiliary transistor 27 is a value lower than the voltage between the input and output terminals by a voltage corresponding to the voltage drop of the resistor 25.
Therefore, in order to obtain the expected phase compensation effect, it is necessary to increase the voltage difference between the input and output terminals by the voltage corresponding to the voltage drop of the resistor 25, so that the auxiliary transistor 27 operates in the saturation region, so the input and output voltage difference In small cases, it is difficult to perform movements stably

Method used

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Embodiment Construction

[0017] figure 1 It is a circuit diagram showing the regulator of the embodiment of the present invention.

[0018] The voltage regulator 100 of this embodiment has an error amplifier 11, a reference voltage source 12, an output transistor 13, a voltage dividing circuit 14, a resistor 15, a capacitor 16, an auxiliary transistor 17, an offset voltage source 18, an input terminal 101, and an output terminal 102. .

[0019] The output terminal of the reference voltage source 12 is connected to the inverting input terminal of the error amplifier 11 , and the output terminal of the voltage dividing circuit 14 is connected to the non-inverting input terminal. The source of the output transistor 13 is connected to the input terminal 101 , the drain is connected to the output terminal 102 , and the gate is connected to the output terminal of the error amplifier 11 . The voltage dividing circuit 14 is connected between the output terminal 102 and the ground terminal 103 . The resist...

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Abstract

A voltage regulator characterized by having an offset voltage source between the gate of the auxiliary transistor constituting the phase compensation circuit and the output terminal of the error amplifier, capable of performing stable operation even when the difference between the input and output voltages is small Phase compensation action.

Description

technical field [0001] The present invention relates to a voltage regulator, and more specifically, to a phase compensation circuit for a voltage regulator. Background technique [0002] image 3 is a circuit diagram showing a conventional regulator. [0003] For example, as shown in Patent Document 1, a conventional regulator 200 has an error amplifier 21, a reference voltage source 22, an output transistor 23, a voltage divider circuit 24, a resistor 25, a capacitor 26, an auxiliary transistor 27, an input terminal 101, and an output Terminal 102. [0004] The output terminal of the reference voltage source 22 is connected to the inverting input terminal of the error amplifier 21 , and the output terminal of the voltage dividing circuit 24 is connected to the non-inverting input terminal. The source of the output transistor 23 is connected to the input terminal 101 , the drain is connected to the output terminal 102 , and the gate is connected to the output terminal of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561G05F1/575G05F1/59G05F1/56
Inventor 原田范行
Owner SII SEMICONDUCTOR CORP