CN113655837A - Linear voltage stabilizer with fast transient response - Google Patents
Linear voltage stabilizer with fast transient response Download PDFInfo
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- CN113655837A CN113655837A CN202110834996.6A CN202110834996A CN113655837A CN 113655837 A CN113655837 A CN 113655837A CN 202110834996 A CN202110834996 A CN 202110834996A CN 113655837 A CN113655837 A CN 113655837A
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- power tube
- transient response
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- linear voltage
- feedback
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Abstract
A linear voltage regulator with fast transient response relates to the integrated circuit technology. The high-power-factor band-pass filter 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 linear voltage regulator has excellent transient response characteristic when the load variation is a heavy-load large current value.
Description
Technical Field
The present invention relates to integrated circuit technology.
Background
The linear voltage stabilizer with the rapid transient response function belongs to a very important component in power management application, and is mainly applied to environments such as a mobile power supply, a Digital Signal Processing (DSP), a Radio Frequency (RF), an analog-to-digital conversion (ADC), Bluetooth, an interface chip and the like. The device has the advantages of small volume, low cost, low noise, convenient application and the like, thereby being widely applied.
In practical application environment, the linear voltage regulator can be used as a power supply of a digital chip. During the operation of the digital chip, the digital chip is switched on and off, so that the power supply voltage of the digital chip is instantly decreased and increased. If the power supply voltage of the digital chip cannot be recovered to the target voltage in time (i.e., the response time of the linear voltage regulator is too long and the overshoot voltage fluctuation is large), the digital chip cannot work normally, and an erroneous digital logic output result is generated, thereby causing serious consequences. Therefore, the linear voltage regulator is required to have a fast transient response function, so that the response time is shorter, the overshoot voltage is smaller, the digital chip works normally, and the reliability of the digital chip is improved.
Referring to fig. 1, in order to provide a fast transient response function for a linear regulator, a common technical method is to connect a feedback capacitor C1 to the input terminal of a driving circuit at an output terminal OUT1, and avoid a main loop (i.e., avoid an error amplifier circuit). When the load changes, the change of the output voltage OUT1 can be quickly fed back to the input end of the driving circuit through the C1, and then the driving circuit controls the power transistor PMOS1, so that a fast negative feedback loop is formed, and the chip has a fast transient response function. However, when the load variation of the linear regulator is 5A current or more, the response time and the overshoot voltage are inevitably increased.
Therefore, in order to avoid the above problems, it is necessary to design a linear regulator that is optimized in terms of the overall circuit structure based on the conventional common techniques and that is superior in the fast transient response function.
Disclosure of Invention
The invention aims to solve the technical problem of providing a linear voltage regulator with fast transient response, which can effectively improve the transient response characteristic and solve the defects of overlong response time and overlarge overshoot voltage when the load current variable is at or above 5A.
The invention solves the technical problem by adopting the technical scheme that the linear voltage stabilizer with fast transient response 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 the voltage stabilizer.
The linear voltage regulator has excellent transient response characteristic when the load variation is a heavy-load large current value. In the practical application process, the linear voltage stabilizer can provide stable power supply voltage for heavy current loads such as DSP and the like, and the reliability and the stability of a system are improved.
Drawings
Fig. 1 is a schematic diagram of a conventional technique for a linear regulator with transient response function.
Fig. 2 is a diagram illustrating an overshoot voltage and a recovery time.
FIG. 3 is a schematic diagram of the method of the present invention.
Fig. 4 is a waveform diagram of the simulation result.
Fig. 5 is a waveform diagram of the actual measurement result of the product.
Detailed description of the preferred embodiments
Referring to fig. 3, the invention is based on the main loop, and a feedback circuit (PNP2, C2, RF3) is designed. The main loop comprises feedback resistors RF2, RF22, an error amplifier, a driving circuit and a power tube PNP 2. When the load current changes, the voltage change at the output terminal OUT2 avoids the main loop and the driving circuit, and the feedback circuit (PNP2, C2 and RF3) directly controls the base of the power tube PNP2, so that loop negative feedback is formed.
Referring to fig. 2-5, fig. 2 illustrates the main parameters that affect the transient response. The transient response is defined as the maximum allowed change in the output voltage when the load current is abruptly changed.
When the output load changes in steps, the linear voltage regulator generates overshoot and undershoot which can represent the transient response speed of the load on one hand, and directly influences the precision of the output voltage. When the output current suddenly changes from 0 to the maximum output current IoutmaxThen the maximum overshoot voltage Vdip。
Overshoot voltage and output current IoutmaxThe voltage across the parasitic resistor ESR is proportional to the voltage across the parasitic inductor ESL, and the output capacitor Cout is inversely proportional. In the circuit, the parasitic capacitance value of the power tube gate is large, and the response time t1 is directly influenced. Therefore, the response time t1, the closed loop bandwidth BW, and the driving current I of the power tube gateSRInversely proportional to the parasitic capacitance C of the power tube gridparGrid potential change quantity delta V of power tubeGIs in direct proportion.
In order to increase the transient response speed, as shown in fig. 1, a common technical method is to design a driving circuit, connect a feedback capacitor at the input end of the driving circuit and the output end OUT1 of the linear regulator, and feed back a detection signal to the driving circuit by detecting the change of the output voltage OUT1 of the linear regulator, so that the driving circuit quickly charges and discharges the gate of the regulating tube, thereby improving the output state of the regulating tube and increasing the transient response speed. This feedback signal does not pass through the error amplifier, thus shortening the response time.
Fig. 3 is a schematic diagram of the present invention.
The feedback circuit is characterized in that a feedback loop (composed of a feedback triode PNP23, a feedback resistor RF3 and a feedback capacitor C2) is adopted, a PNP tube is adopted as a power tube PNP2, an output end OUT2 of the linear voltage stabilizer is connected with an emitter of a feedback triode PNP23, and a base of a feedback triode PNP23 is connected with a base of a power tube PNP 2.
The main function of the feedback triode PNP23 is to reduce the change quantity DeltaV of the base electrode potential of the power tubeG。
The main function of the feedback capacitor C2 is to reduce noise on the output terminal OUT2 of the linear regulator, and to avoid the negative effect of the noise on the base voltage of the PNP2 power transistor.
When the load current is suddenly changed from 0A to 5A, the voltage value of the output end OUT2 of the linear voltage regulator is reduced, the reduced value is passed through the BE junction of the feedback triode PNP23, the voltage on the base electrode of the power tube PNP2 is reduced, and finally the voltage of the output end OUT2 of the linear voltage regulator is increased. Therefore, loop negative feedback is formed, and a loop composed of the error amplifier is avoided, and the transient response function is improved. Conversely, when the load current changes from 5A to 0A, the working principle is also the same.
Fig. 4 shows a simulation result waveform (software interface screenshot).
The simulation conditions were that the supply voltage Vin was 4.3V and the output voltage was 3.3V. When the load current suddenly changes from 0A to 5A, the overshoot voltage Vdip is about 51mV and the recovery time is about 15 us.
FIG. 5 is the overall layout and the devices PNP23, RF3, C2 location.
Fig. 5 is a waveform of the result of actual measurement of the product. By testing the chip adopting the technology of the invention by using an oscilloscope, the overshoot voltage Vlip is about 50mV, and the recovery time is about 20 us.
Claims (1)
1. Linear voltage stabilizer of quick transient response, including error amplifier, drive circuit, power tube, the output of stabiliser is connected to the current output end of power tube, its characterized in that, the power tube is the PNP triode, and the base of power tube and drive circuit's output are connected, and the collecting electrode is as current output end, and the base of power tube is connected with the base of feedback triode, the feedback triode is the PNP pipe, and its projecting pole is connected with the collecting electrode of power tube, and the projecting pole of feedback triode still passes through a electric capacity connection collecting electrode, and the collecting electrode passes through resistance ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110834996.6A CN113655837A (en) | 2021-07-23 | 2021-07-23 | Linear voltage stabilizer with fast transient response |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110834996.6A CN113655837A (en) | 2021-07-23 | 2021-07-23 | Linear voltage stabilizer with fast transient response |
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| CN113655837A true CN113655837A (en) | 2021-11-16 |
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| CN202110834996.6A Pending CN113655837A (en) | 2021-07-23 | 2021-07-23 | Linear voltage stabilizer with fast transient response |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100213907A1 (en) * | 2009-02-25 | 2010-08-26 | Himax Analogic, Inc. | Low Drop Out Linear Regulator |
| CN102707754A (en) * | 2012-05-30 | 2012-10-03 | 昆山锐芯微电子有限公司 | Low dropout regulator |
| CN103135648A (en) * | 2013-03-20 | 2013-06-05 | 电子科技大学 | Low dropout regulator |
| CN103309386A (en) * | 2012-03-15 | 2013-09-18 | 德州仪器公司 | Self-calibrating stable ldo regulator |
| CN104079177A (en) * | 2014-06-24 | 2014-10-01 | 华为技术有限公司 | Circuit of voltage adjuster |
| US20160161961A1 (en) * | 2014-12-05 | 2016-06-09 | Vidatronic, Inc. | Circuit to improve load transient behavior of voltage regulators and load switches |
| CN105955390A (en) * | 2016-07-01 | 2016-09-21 | 唯捷创芯(天津)电子技术股份有限公司 | Low-dropout linear regulator module, chip and communication terminal |
| CN109683648A (en) * | 2017-10-19 | 2019-04-26 | 辉芒微电子（深圳）有限公司 | A kind of LDO circuit |
| CN112130612A (en) * | 2020-09-23 | 2020-12-25 | 中国电子科技集团公司第五十八研究所 | Large-current linear voltage regulator circuit with stability compensation |
-
2021
- 2021-07-23 CN CN202110834996.6A patent/CN113655837A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100213907A1 (en) * | 2009-02-25 | 2010-08-26 | Himax Analogic, Inc. | Low Drop Out Linear Regulator |
| CN103309386A (en) * | 2012-03-15 | 2013-09-18 | 德州仪器公司 | Self-calibrating stable ldo regulator |
| CN102707754A (en) * | 2012-05-30 | 2012-10-03 | 昆山锐芯微电子有限公司 | Low dropout regulator |
| CN103135648A (en) * | 2013-03-20 | 2013-06-05 | 电子科技大学 | Low dropout regulator |
| CN104079177A (en) * | 2014-06-24 | 2014-10-01 | 华为技术有限公司 | Circuit of voltage adjuster |
| US20160161961A1 (en) * | 2014-12-05 | 2016-06-09 | Vidatronic, Inc. | Circuit to improve load transient behavior of voltage regulators and load switches |
| CN105955390A (en) * | 2016-07-01 | 2016-09-21 | 唯捷创芯(天津)电子技术股份有限公司 | Low-dropout linear regulator module, chip and communication terminal |
| CN109683648A (en) * | 2017-10-19 | 2019-04-26 | 辉芒微电子（深圳）有限公司 | A kind of LDO circuit |
| CN112130612A (en) * | 2020-09-23 | 2020-12-25 | 中国电子科技集团公司第五十八研究所 | Large-current linear voltage regulator circuit with stability compensation |
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