System improving load regulation rate of low-pressure-difference linear voltage regulator

Abstract

A system improving the load regulation rate of a low-pressure-difference linear voltage regulator specifically relates to a circuit system, and comprises a linear voltage stabilizing circuit which generates output voltage to a controlled load, and a control circuit which controls the output of a first control signal to the linear voltage stabilizing circuit and controllably outputs a second control signal to the controlled load at a predetermined time after corresponding generation of the first control signal. The controlled load changes work current when controlled by the second control signal. The linear voltage stabilizing circuit comprises a referential voltage generation circuit which generates at least two referential voltages with different voltage values, an adjusting unit which selectively connects with one path of the at least two referential voltage under the effect of first control signals, and the current of the output voltage is adjusted under the effect of referential voltage to stabilize output voltage. Before the controlled load is changed, the output voltage of the linear voltage stabilizing circuit is changed, the load adjusting rate is changed, and the system stability is ensured.

Description

Technical field [0001] The invention relates to the field of electronic technology, in particular to a circuit system. Background technique [0002] In order to adapt to the rapid development of electronics and communication technology, multiple functional units in electronic equipment, especially portable electronic equipment, such as audio, lighting, communications, equipment management, etc. often require a stable power supply voltage, low dropout linear regulators (LDO, Compared with traditional three-terminal fixed voltage regulators, LowDropout regulators are widely used because of the advantages of smaller input / output voltage difference, simple circuit structure, small footprint of printed circuit board, and no switching noise. The ideal power system should have good system stability and load transient performance. The output voltage is stable to line and load changes, and can provide a fixed output voltage without changes due to time and temperature. The load is adjusted...

AI Technical Summary

Problems solved by technology

An ideal power supply system should have good system stability and load transient performance, the output voltage is stable for line and load changes, and can provide a fixed output voltage, which will not change due to time and temperature, and the load adjustment The rate is an important parameter to measure the transient performance of the low dropout linear regulator. It measures the degree of influence of the change of the load on the output voltage when the input voltage is constant. A common system structure in the prior art is as follows: figure 1 As shown, it includes a controlled load, a low-dropout linear regulator, and a control circuit. During the working process of the system, when a controlled load needs to be added, the control circuit directly sends a control signal to the controlled load, and the low-dropout The linear regulator provides the output voltage to the controlled load. The voltage-time or current-time waveform diagram of the existing system is as follows figure 2 As shown, the disadvantages of this control system are: the sudden increase of the controlled load will cause large fluctuations in the output voltage, which will affect the stable operation of the system

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