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Low-voltage-difference linear stabilized-voltage circuit and system

A low-dropout linear and voltage-stabilizing circuit technology, applied in control/regulation systems, regulating electrical variables, instruments, etc., can solve problems such as large bandwidth, power consumption, and lower output accuracy, and achieve the effect of simple structure

Active Publication Date: 2012-03-28
IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there will be the following two problems: 1. Large loop bandwidth will cause large power consumption; 2. Low gain will reduce output accuracy

Method used

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  • Low-voltage-difference linear stabilized-voltage circuit and system
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  • Low-voltage-difference linear stabilized-voltage circuit and system

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Embodiment Construction

[0012] See figure 2 The preferred embodiment of the low dropout linear voltage stabilizing system of the present invention includes a power terminal VDD, a fast channel circuit connected to the power terminal VDD, a slow channel circuit connected to the power terminal VDD, and a slow channel circuit connected to the slow channel circuit. The reference voltage terminal VREF, an output terminal VOUT connected to the fast channel circuit and the slow channel circuit, a load LOAD and a ground terminal GND. Wherein, the fast path circuit includes a first field effect tube M1 and a control sub-circuit a1, and the slow path circuit includes an operational amplifier OP, a first resistor R1, a second resistor R2, and the first field effect tube M1 . The fast channel circuit is used to quickly respond to the rapid change of the power supply terminal VDD or the load LOAD to quickly adjust the voltage value output by the output terminal VOUT to the correct value; the slow channel circuit ...

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PUM

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Abstract

The invention relates to a low-voltage-difference linear stabilized-voltage circuit, which comprises a power-supply end, a reference-voltage end, an output end, a load, a grounding end, a fast-channel circuit and a slow-channel circuit, wherein the fast-channel circuit is connected between the power-supply end and the load and is used for adjusting a voltage value output by the output end, the slow-channel circuit is connected between the power-supply end and the load and is used for stabilizing the voltage value output by the output end, the fast-channel circuit and the slow-channel circuit are together connected with the output end, the slow-channel circuit is connected with the reference-voltage end, the fast-channel circuit comprises a first field-effect transistor and a control subcircuit which is connected with the first field-effect transistor, and the slow-channel circuit comprises an operational amplifier which is connected with the reference-voltage end, a first resistor which is connected with the operational amplifier, a second resistor which is connected with the first resistor and the first field-effect transistor. The invention also provides a low-voltage-difference linear stabilized-voltage system. The low-voltage-difference linear stabilized-voltage circuit and the low-voltage-difference linear stabilized-voltage system have simple structures, the power consumption is reduced, and the output precision is ensured.

Description

Technical field [0001] The invention relates to a voltage stabilizing circuit and system, in particular to a low-dropout linear voltage stabilizing circuit and system that can save external decoupling capacitors. Background technique [0002] LDO (low dropout regulator) is a low dropout linear regulator, which has the advantages of low noise and easy integration, and is widely used in electronic systems. [0003] See figure 1 , figure 1 It is an existing LDO circuit structure, in which opamp is a single-stage operational amplifier, MP is a field effect tube, and resistors R11 and R22 form a feedback circuit. Because the bandwidth of this LDO structure is relatively low, when the power supply voltage VDD' or load ILOAD changes rapidly, the output terminal VOUT' will cause a large overshoot or drop, and it will take a long time to recover to normal output Value, this will greatly reduce system performance or even make the system inoperative. To solve this problem, a grounded decoup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/10G05F1/575
Inventor 黄俊维
Owner IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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