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Voltage regulator

A voltage stabilizer and voltage technology, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, etc., can solve problems such as unreasonable phase compensation, and achieve the effect of reasonable phase compensation

Inactive Publication Date: 2013-05-01
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phase compensation is performed based on the drain voltage of the readout transistor 77, so phase compensation is not reasonable

Method used

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Embodiment Construction

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0024] First, the structure of the regulator will be described. figure 1 is a circuit diagram showing a voltage regulator. figure 2 It is a circuit diagram showing a current supply circuit and a resistor circuit.

[0025] The voltage regulator includes an input terminal 10 , a ground terminal 11 and an output terminal 12 . Further, the voltage regulator includes an output transistor 13 , a voltage dividing circuit 14 , a reference voltage generating circuit 15 , a differential amplifier circuit 16 , an amplifier circuit 17 , a current supply circuit 18 , a resistance circuit 19 , and a capacitor 20 for phase compensation.

[0026] The gate of the output transistor 13 is connected to the output terminal of the amplifier circuit 17 , the source is connected to the input terminal 10 , and the drain is connected to the output terminal 12 . The voltage dividing circuit ...

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Abstract

Provided is a voltage regulator capable of performing appropriate phase compensation. Even when a difference between an input voltage and an output voltage is small, an appropriate phase compensation voltage based on an output voltage (Vout) is generated in a resistor circuit (19), and the appropriate phase compensation voltage is applied to a phase compensation capacitor (20). Accordingly, the voltage regulator is capable of performing appropriate phase compensation.

Description

technical field [0001] The present invention relates to voltage regulators. Background technique [0002] For stable operation, the voltage regulator has a phase compensation circuit. [0003] Figure 4 It is a circuit diagram of a conventional voltage regulator with a phase compensation circuit. [0004] When the output voltage Vout becomes higher, the divided voltage Vfb also becomes higher. When the divided voltage Vfb is higher than the reference voltage Vref, the output voltage of the differential amplifier circuit 76 becomes high. Therefore, the gate voltage of the output transistor 73 becomes high, so the drain current of the output transistor 73 decreases, and the output voltage Vout becomes low. Therefore, the output voltage Vout is controlled to a certain desired voltage. At this time, the gate voltage of the sense transistor (sense transistor) 77 also becomes high, so the drain current of the sense transistor 77 also decreases. Therefore, the current flowing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56G05F3/26
CPCG05F1/575G05F3/02G05F3/16
Inventor 二瓶洋太朗黑藏忠井村多加志
Owner SII SEMICONDUCTOR CORP