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Current-limiting circuit for linear voltage stabilizer and low-voltage difference linear voltage stabilizer

A technology of low-dropout linear and linear voltage regulators, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., and can solve problems such as voltage regulator damage and inapplicability

Inactive Publication Date: 2006-10-25
CHINA RESOURCES POWTECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the application of linear regulators and low-dropout (LDO) linear regulators, if the regulator device itself does not have a protection circuit, it is very easy to cause the regulator to be damaged in extreme working environments such as over-temperature or output short circuit.
In traditional bipolar linear regulators, a diode connected between the power supply and the base of the pass element is used to limit the current. This method is not suitable for low-dropout linear regulators using CMOS technology.

Method used

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  • Current-limiting circuit for linear voltage stabilizer and low-voltage difference linear voltage stabilizer
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  • Current-limiting circuit for linear voltage stabilizer and low-voltage difference linear voltage stabilizer

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Embodiment Construction

[0025] Please see attached figure 1 As shown, the current limiting circuit of the present invention includes an error amplifier 310 , a pass element 311 , an output current sampling circuit 312 , a maximum allowable output current setting circuit 313 , a current limiting loop amplifier 314 and a second amplifier stage 316 . Wherein, the input end of the pass element 311 is connected to the output end of the error amplifier 310, and its output end is connected to the input end of the output current sampling circuit 312, and the output end of the sampling circuit 312 and the output end of the current setting circuit 313 are connected to the current limiting The input terminal of the loop amplifier 314 and the output terminal of the current limiting loop amplifier 314 are connected to the input terminal of the second amplifier stage 316 , and the output terminal of the second amplifier stage 316 is fed back to the input terminal of the pass element 311 .

[0026] figure 2 Shown...

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Abstract

The present invention includes error amplifier, current output sample circuit, current configuring circuit, and current limiting loop amplifier; wherein said current limiting loop amplifier output end connected with passage-way element input end to form current limiting loop, passage-way element locking current on maximum output enable current through loop action.

Description

technical field [0001] The invention relates to a current-limiting circuit, in particular to a current-limiting circuit for a linear regulator and a low-dropout linear regulator (LDO). Background technique [0002] Linear regulators and low-dropout (LDO) linear regulator circuits are used to generate a clean, regulated output voltage from a higher, noisy voltage source. The advantages of linear regulators are that the output voltage responds quickly to changes in the input voltage or load, the ripple and noise of the output voltage are low, the circuit structure is simple, the volume is small, and the price is low. In recent years, low dropout linear regulators have become the mainstream of low-power step-down and regulators due to the improvement of conversion efficiency, coupled with their size and low noise characteristics. It is widely used in various battery-powered portable systems and communication-related electronic products, such as mobile phones, PDAs, and cameras...

Claims

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Application Information

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IPC IPC(8): G05F1/565
Inventor 王磊刘晨
Owner CHINA RESOURCES POWTECH SHANGHAI