Double ring low differential voltage linear voltage stabilizer circuit

A technology of low-dropout linearity and voltage regulators, which is applied in the direction of instruments, electrical variable adjustment, control/regulation systems, etc., can solve problems such as difficult compensation methods and dynamic response effects, achieve high bandwidth, improve dynamic performance, and stability improved effect

Inactive Publication Date: 2007-04-18
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the dynamic response of the system will be affected, and it is di...

Method used

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  • Double ring low differential voltage linear voltage stabilizer circuit
  • Double ring low differential voltage linear voltage stabilizer circuit
  • Double ring low differential voltage linear voltage stabilizer circuit

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Embodiment Construction

[0013] As shown in Figure 2, the double-loop low-dropout linear regulator circuit of the present invention includes an error amplifier 1, a second-stage amplifier 2, a power transistor 3, a compensation unit 4, an output sampling network 5, a load capacitor 6, a load circuit 7, a feedforward Amplifier 8, pull-up drive tube 9, pull-down drive tube 10 and sampling tube 11. The above-mentioned parts constitute two loops, the main loop and the additional loop in the circuit. The main loop includes the error amplifier 1, the second amplifier 2, the pull-up drive tube 9, the power tube 3 and the output sampling network 5, forming a negative feedback Loop stabilized output voltage V OUT . The additional loop includes a feed-forward amplifier 8, a sampling tube 11, a pull-down drive tube 10 and a power tube 3 to form a second loop, which refers to the output voltage to form a negative feedback loop and a dynamic compensation circuit to further stabilize the output voltage V OUT ; Wi...

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Abstract

The invention discloses double ring low voltage difference linear voltage regulator circuit. It includes error amplifier, secondary amplifier, power tube, compensating unit, output sampling network, load capacitance and load circuit, feed-forward amplifier, pull-up driving tube, pull-down driving tube, and sampling tube. It includes two loop circuits that the main one includes the error amplifier, secondary amplifier, pull-up driving tube, power tube, and output sampling network which form negative feedback loop to stably output voltage VOUT; the additional one includes feed-forward amplifier, sampling tube, pull-down driving tube, and power tube which refer to output voltage, form feed back loop to dynamically compensate circuit and further stably output voltage VOUT, and refer to load current, form positive feedback loop to increase load step change for the response circuit. The invention can supply better transient response, periphery circuit selecting, and phase margin for the circuit.

Description

technical field [0001] The invention belongs to the technology of linear power supply, in particular to a double-loop low-dropout linear regulator (LDO) circuit, which can improve the dynamic performance of the LDO circuit. Background technique [0002] With the rapid development of electronic technology, electronic products require higher performance power supply systems. LDO circuit is widely used in lithium battery charging, low-voltage digital circuit power supply and other occasions due to its simple circuit structure, small chip area occupation, low noise, high ripple suppression and other advantages. In order to meet the development needs of the power supply market, good system stability and load transient performance have become the key research direction of linear power supply technology. [0003] A high-precision LDO circuit needs to use a high-gain error amplifier to meet the needs, and high-gain requires frequency compensation to ensure the stable performance of...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 邹雪城刘政林张科峰雷鑑铭郑朝霞邹志革骞海荣
Owner HUAZHONG UNIV OF SCI & TECH
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