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Linear voltage regulator with fast transient response

A linear voltage regulator and transient response technology, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as large overshoot voltage and long response time, and achieve improved reliability and stability, excellent Effect of Transient Response Characteristics

Inactive Publication Date: 2021-11-16
CHENGDU SINO MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a linear voltage regulator with fast transient response, which can effectively improve the transient response characteristics, and solve the problem of excessively long response time and Disadvantages of excessive overshoot voltage

Method used

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  • Linear voltage regulator with fast transient response
  • Linear voltage regulator with fast transient response
  • Linear voltage regulator with fast transient response

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Embodiment Construction

[0014] specific implementation plan

[0015] see image 3 , the content of the present invention is to design the feedback circuit (PNP2, C2, RF3) on the basis of the main loop. The main loop includes feedback resistors RF2, RF22, error amplifier, drive circuit, and power transistor PNP2. When the load current changes, the voltage change on the output terminal OUT2 avoids the main loop and the drive circuit, which directly controls the base of the power transistor PNP2 through the feedback circuit (PNP2, C2, RF3), forming a loop negative feedback .

[0016] see Figure 2 to Figure 5 , figure 2 The main parameters affecting the transient response are shown. Transient response is defined as the maximum allowable change in output voltage when the load current changes abruptly.

[0017] When the output load changes step by step, the linear regulator will produce overshoot and undershoot. On the one hand, the overshoot and undershoot can represent the speed of load transient...

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Abstract

The invention discloses a linear voltage regulator with fast transient response, and relates to an integrated circuit technology. The linear voltage regulator comprises an error amplifier, a driving circuit and a power tube, wherein the current output end of the power tube is connected with the output end of a voltage stabilizer, the power tube is a PNP triode, the base electrode of the power tube is connected with the output end of the driving circuit, the collector electrode of the power tube is used as a current output end, the base electrode of the power tube is connected with the base electrode of a feedback triode, the feedback triode is a PNP tube, the emitter of the feedback triode is connected with the collector electrode of the power tube, the emitter of the feedback triode is also connected with the collector electrode through a capacitor, and the collector electrode is grounded through a resistor. The linear voltage regulator has an excellent transient response characteristic when the load variation is a heavy-load large current value.

Description

technical field [0001] The present invention relates to integrated circuit technology. Background technique [0002] The linear regulator with fast transient response function is a very important part in power management applications, mainly used in mobile power supply, digital signal processing DSP, radio frequency RF, analog-to-digital conversion ADC, Bluetooth, interface chip and other environments . It has the advantages of small size, low cost, low noise, and convenient application, so it is widely used. [0003] In the actual application environment, the linear voltage regulator can be used as the power supply of the digital chip. During the working period of the digital chip, the on and off states are switched to each other, which will cause the power supply voltage of the digital chip to drop and rise instantaneously. If the power supply voltage of the digital chip cannot be restored to the target voltage in time (that is, the response time of the linear regulator...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 马迎岑远军刘中伟冯浪李永凯张得力岳平
Owner CHENGDU SINO MICROELECTRONICS TECH CO LTD