CN103729007A - Linear regulator with soft start control circuit - Google Patents
Linear regulator with soft start control circuit Download PDFInfo
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- CN103729007A CN103729007A CN201310597266.4A CN201310597266A CN103729007A CN 103729007 A CN103729007 A CN 103729007A CN 201310597266 A CN201310597266 A CN 201310597266A CN 103729007 A CN103729007 A CN 103729007A
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Abstract
The invention provides a linear regulator with a soft start control circuit. The linear regulator comprises an operational amplifier and an output cascade circuit, wherein the operational amplifier compares a voltage distributing signal with a reference voltage of an output node of the output cascade circuit and outputs a control signal to control the output cascade circuit. When the linear regulator is in a non-start stage, the output cascade circuit outputs constant voltages. The linear regulator is characterized by further comprising the soft start control circuit and a first power drive tube, wherein the size of the first power drive tube is smaller than that of a power drive tube in the output cascade circuit, the soft start control circuit detects whether the linear regulator is in the start stage, when the linear regulator is in the start stage, the first power drive tube is started so that the linear regulator can charge a load with currents flowing through the first power drive tube, and when the linear regulator is in the non-start stage, the power drive tube in the output cascade circuit charges the load.
Description
Technical field
The application relates to system level chip (SOC) integrated circuit (IC) design field, more specifically, relates to a kind of linear voltage stabilization source with SS (soft start) control circuit that can control starting current.
Background technology
Fig. 1 is the diagram that the linear voltage stabilization source (LDO) of prior art is shown.As shown in Figure 1, this circuit comprises operational amplifier A MP and output-stage circuit, and described output-stage circuit can comprise power tube PMOS, feedback resistance R1, R2 and output load capacitance Cout, and when starting, this circuit easily produces huge starting current.Fig. 2 illustrates the sequential chart in the linear voltage stabilization source of Fig. 1.As shown in Figure 2, when linear voltage stabilization source changes from low to high with its supply voltage VDD and while starting, the initial value of output voltage V out is 0, the voltage of electric resistance partial pressure end FB is also 0, well below another input end of operational amplifier A MP (, reference voltage VREF) voltage, so the voltage of operational amplifier A MP output terminal VG is 0.At this moment, the value of the gate source voltage of power tube PMOS (Vgs) and source-drain voltage (Vsd) is all supply voltage VDD, and the current value that power tube PMOS drives is
(wherein, K is the coefficient being determined by oxide layer electric capacity and mobility, w, l are respectively the wide, long of power tube PMOS, VDD is supply voltage, Vth is the threshold voltage of power tube PMOS), considerably beyond the normal working value in linear voltage stabilization source, even may exceed the output ability to bear of the supply voltage VDD in linear voltage stabilization source.This problem is especially serious when supply voltage VDD is climbed to high value, may make significantly saltus step of power values, easily causes that whole system is locked, and shortens chip serviceable life of power supply even.
Summary of the invention
According to an aspect of the present invention, a kind of linear voltage stabilization source with SS (soft start) control circuit is provided, comprise operational amplifier and output-stage circuit, operational amplifier compares the voltage division signal of the output node of output-stage circuit and reference voltage, and export control signal for controlling output-stage circuit, at linear source of stable pressure, work in non-when unloading phase, output-stage circuit output constant voltage, it is characterized in that: linear voltage stabilization source also comprises SS (soft start) control circuit and the first power drive pipe, wherein, the size of the first power drive pipe is less than the size of the power drive pipe in output-stage circuit, wherein, SS (soft start) control circuit detect linear source of stable pressure whether in unloading phase, when in when unloading phase, open this first power drive pipe, only charged to load to flow through the electric current of this first power drive pipe in linear voltage stabilization source, when in non-unloading phase, the power drive pipe of controlling in output-stage circuit charges to load.
Operational amplifier can comprise symmetric form operational amplifier, SS (soft start) control circuit by detect the output current of symmetric form operational amplifier detect linear source of stable pressure whether in unloading phase.
SS (soft start) control circuit can comprise charging transistor, the first electric capacity and trigger, the described output current of charging transistor mirror image symmetric form operational amplifier is with to the first capacitor charging, trigger detects the voltage of the first electric capacity to determine whether the power drive pipe in output-stage circuit charges to load, wherein, described unloading phase, disconnect the power drive pipe in output-stage circuit, power drive pipe in output-stage circuit does not charge to load, described non-unloading phase, power drive pipe in conducting output-stage circuit, power drive pipe in output-stage circuit charges to load.
Symmetric form operational amplifier can comprise the input transistors that the first and second transistors form, the first transistor receives described reference voltage, transistor seconds receives described voltage division signal, symmetric form operational amplifier also comprises first, second, and third current mirror, the first transistor is controlled the electric current that flows through the first current mirror, transistor seconds is controlled the electric current that flows through the second current mirror, and the first current mirror is controlled the electric current that flows through the 3rd current mirror, the electric current of charging transistor mirror image the 3rd current mirror.
PMOS pipe Mc can form charging transistor, PMOS pipe Mp1 forms the first transistor, Mp2 forms transistor seconds, NMOS pipe Mn1 and Mn3 form the first current mirror, NMOS pipe Mn2 and Mn4 form the second current mirror, PMOS pipe Mp3 and Mp4 form the 3rd current mirror, wherein, the drain electrode of Mp1 is connected to the grid of Mn1 and the grid of drain electrode and Mn3, the drain electrode of Mn3 is connected to the grid of Mp3 and the grid of drain electrode and Mp4, the drain electrode of Mp2 is connected to the grid of Mn2 and the grid of drain electrode and Mn4, the output node that the drain electrode of Mp4 and the drain electrode of Mn4 link together as symmetric form operational amplifier is to control the first power drive pipe.
Charging transistor can mirror image PMOS the electric current of pipe Mp3 and Mp4.
Symmetric form operational amplifier also can comprise that the input power and the PMOS that are connected in linear voltage stabilization source manage the current source between Mp1 and the source electrode tie point of Mp2, and the input power in linear voltage stabilization source is the power supply of outside input.
Described linear voltage stabilization source also can comprise soft-start mode gauge tap, and SS (soft start) control circuit is controlled soft-start mode gauge tap with the power drive pipe in disconnection or conducting output-stage circuit.
SS (soft start) control circuit can be included in operational amplifier.
Power drive pipe in output-stage circuit and the first power drive Guan Jun can be PMOS pipe, and the ratio of the power drive pipe in output-stage circuit and the breadth length ratio of the first power drive pipe is M, M>1.
By part in ensuing description set forth the present invention other aspect and/or advantage, some will be clearly by descriptions, or can pass through enforcement of the present invention and learn.
Accompanying drawing explanation
By the detailed description of carrying out below in conjunction with accompanying drawing, above and other objects of the present invention and feature will become apparent, wherein:
Fig. 1 is the diagram that the linear voltage stabilization source (LDO) of prior art is shown;
Fig. 2 illustrates the sequential chart in the linear voltage stabilization source of Fig. 1;
Fig. 3 is the diagram that the linear voltage stabilization source according to an exemplary embodiment of the present invention with SS (soft start) control circuit is shown;
Fig. 4 illustrates the diagram of operational amplifier according to an exemplary embodiment of the present invention;
Fig. 5 is the start-up course sequential chart that the linear voltage stabilization source according to an exemplary embodiment of the present invention with SS (soft start) control circuit is shown.
Embodiment
Now, describe exemplary embodiment of the present invention in detail, its example represents in the accompanying drawings, and wherein, identical label represents identical parts all the time.
Fig. 3 is the diagram that the linear voltage stabilization source according to an exemplary embodiment of the present invention with SS (soft start) control circuit is shown.
As shown in Figure 3, the linear voltage stabilization source according to an exemplary embodiment of the present invention with SS (soft start) control circuit comprises operational amplifier A MP10, output-stage circuit, soft-start mode gauge tap and power drive pipe 11, wherein, output-stage circuit is output-stage circuit of the prior art, can comprise power drive pipe 12, feedback resistance 13,14, output load capacitance Cout; Power drive pipe 11 sizes are less than power drive pipe 12, and the ratio of power drive pipe 12 breadth length ratios and driving tube 11 breadth length ratios is M(M>1); Operational amplifier 10 comprises described SS (soft start) control circuit; The reference voltage that VREF provides for outside, VDD is input supply voltage, Vout is the output voltage in linear voltage stabilization source.When supply voltage VDD is by 0 during to 1 variation, circuit starts to start, and Vout initial voltage is 0, and its dividing point FB voltage is also 0, well below input reference voltage VREF.
Fig. 4 is the diagram that the operational amplifier 10 in Fig. 3 is according to an exemplary embodiment of the present invention shown.
As shown in Figure 4, operational amplifier 10 can comprise the typical symmetric form operational amplifier (Symmetrical OPA) of the SS (soft start) control circuit shown in dotted line frame inside and the outer part of dotted line frame according to an exemplary embodiment of the present invention, wherein, symmetric form operational amplifier can comprise NMOS pipe Mn1～Mn4, PMOS pipe Mp1～Mp4 and bias current sources Is, SS (soft start) control circuit can comprise the metal-oxide-semiconductor Mc as charging current source, play capacitor C c and the SMTT trigger I0 of maintenance and delayed-action, whether this SS (soft start) control circuit will need to enter soft start state according to LDO duty automatic decision LDO as mentioned above, and send control signal SST.
Input reference voltage VREF and dividing point voltage FB are respectively in the same way and the oppositely input voltage of operational amplifier 10.When LDO loop has just been started working and during in starting state, the output voltage of LDO very low (0V), well below input reference voltage VREF, now, Mp1 disconnects, Mp2 conducting, the electric current of the current source Is in operational amplifier 10 flows into Mp2 completely, and Mn1 and Mn3 disconnect, Mp3 disconnects, output stage Mn4 conducting, Mp4 disconnects, and output terminal CTRL voltage is 0.Mc in SS (soft start) control circuit is the mirror image pipe of Mp3 and Mp4, so also capacitor C c is not charged in off-state, Charge point voltage keeps initial value 0, and after SMTT trigger I0, output control signal SST is also 0.Due to the effect of CTRL voltage and SST, power drive pipe 11 conductings in accompanying drawing 3, and gate source voltage Vgs equals VDD, and power drive pipe 12 does not access loop, and its gate source voltage is 0, in off-state.LDO circuit charges the 1/M with above-mentioned theoretical peak electric current I inrush to load capacitance, when unloading phase while closing to an end, , the output terminal of LDO approaches desired value Vtarget=VREF * (R13+R14)/R14 very much, FB voltage approaches input reference voltage VREF very much, the electric current of current source Is approaches uniform-flow and crosses Mp1 and Mp2(, Mp1 and Mp2 flow through half of electric current of about current source Is separately), Mn1, Mn3, Mp3 and Mp4 conducting, because the Mc in SS (soft start) control circuit has identical gate source voltage Vgs with amplifier output stage Mp4, and the ratio of breadth length ratio is 1:K, so Mc be take charging current Imc=Imp4/K(Imp4 as flowing through the electric current of Mp4) capacitor C c is charged, can be by Mn1 be set, Mn3, the ratio of the breadth length ratio of Mp3 and Mp4 makes the electric current of Mp3 and Mp4 approach Is/2, now in SS (soft start) control circuit, Mc pipe charges to Cc with the electric current of Is/2K, through the time delay (dummy schmitt trigger turnover voltage is about VDD/2) of K * VDD * Cc/Is, the SST of SS (soft start) control circuit output becomes 1 from 0, start-up course finishes, power drive pipe 12 access loops in accompanying drawing 3, LDO enters normal work stage.
Fig. 5 is the start-up course sequential chart that the linear voltage stabilization source according to an exemplary embodiment of the present invention with SS (soft start) control circuit is shown.
In the P1 stage, when supply voltage VDD is by 0 during to 1 variation, LDO circuit starts to start, Vout initial voltage is 0, and dividing point voltage FB is also 0, well below input reference voltage VREF, making operational amplifier 10 output CTRL voltages is 0, and output control signal SST is also 0.Due to the effect of CTRL voltage and SST, 11 conductings of power drive pipe, and the poor Vgs of gate source voltage equals VDD.In the P2 stage, LDO circuit charges to load capacitance Cout at the 1/M with theoretical peak electric current I inrush.When unloading phase P2 while closing to an end, Vout voltage approaches desired value, makes dividing point voltage FB approach VREF, Mc conducting and Cc being charged with the electric current of Is/2K, duration of charging is K * VDD * Cc/Is, and then SST becomes 1, power drive pipe 12 access loops from 0.Now, start-up course finishes, and LDO circuit enters normal work stage P3, can be to load circuit output compared with large-drive-current.
It should be noted that, although the SS (soft start) control circuit in above-mentioned exemplary embodiment is arranged at operational amplifier 10 inside, it will be apparent to one skilled in the art that SS (soft start) control circuit can be independent of operational amplifier 10 completely and be set up.
According to exemplary embodiment of the present invention, owing to adding SS (soft start) control circuit to detect the duty of linear source of stable pressure circuit, in linear source of stable pressure start-up course, by reducing or the method limiting starting current of power-limiting driving tube, change the size of LDO efferent duct driving force, avoid occurring off-limits huge starting current, do not increasing under the prerequisite of circuit physical area, reach the effect of soft start; After linear source of stable pressure startup finishes, power drive pipe is being switched to normal size, load circuit is powered.
Although illustrated and described the present invention with reference to certain exemplary embodiments, but it will be apparent to one skilled in the art that in the situation that do not depart from the spirit and scope of the present invention that scope limits by claim and equivalent thereof and can make the various changes in form and details.
Claims (10)
1. a linear voltage stabilization source with SS (soft start) control circuit, comprise operational amplifier and output-stage circuit, operational amplifier compares the voltage division signal of the output node of output-stage circuit and reference voltage, and export control signal for controlling output-stage circuit, at linear source of stable pressure, work in non-when unloading phase, output-stage circuit output constant voltage, is characterized in that:
Linear voltage stabilization source also comprises SS (soft start) control circuit and the first power drive pipe,
Wherein, the size of the first power drive pipe is less than the size of the power drive pipe in output-stage circuit,
Wherein, SS (soft start) control circuit detect linear source of stable pressure whether in unloading phase, when in when unloading phase, open this first power drive pipe, only charged to load to flow through the electric current of this first power drive pipe in linear voltage stabilization source, when in non-unloading phase, the power drive pipe of controlling in output-stage circuit charges to load.
2. linear voltage stabilization as claimed in claim 1 source, wherein, operational amplifier comprises symmetric form operational amplifier, SS (soft start) control circuit by detect the output current of symmetric form operational amplifier detect linear source of stable pressure whether in unloading phase.
3. linear voltage stabilization as claimed in claim 2 source, wherein, SS (soft start) control circuit comprises charging transistor, the first electric capacity and trigger, the described output current of charging transistor mirror image symmetric form operational amplifier is with to the first capacitor charging, trigger detects the voltage of the first electric capacity to determine whether the power drive pipe in output-stage circuit charges to load, wherein, described unloading phase, disconnect the power drive pipe in output-stage circuit, power drive pipe in output-stage circuit does not charge to load, described non-unloading phase, power drive pipe in conducting output-stage circuit, power drive pipe in output-stage circuit charges to load.
4. linear voltage stabilization as claimed in claim 3 source, wherein, symmetric form operational amplifier comprises the input transistors that the first and second transistors form, the first transistor receives described reference voltage, transistor seconds receives described voltage division signal, symmetric form operational amplifier also comprises first, second, and third current mirror, the first transistor is controlled the electric current that flows through the first current mirror, transistor seconds is controlled the electric current that flows through the second current mirror, the first current mirror is controlled the electric current that flows through the 3rd current mirror, the electric current of charging transistor mirror image the 3rd current mirror.
5. linear voltage stabilization as claimed in claim 4 source, wherein, PMOS pipe Mc forms charging transistor, PMOS pipe Mp1 forms the first transistor, Mp2 forms transistor seconds, NMOS pipe Mn1 and Mn3 form the first current mirror, NMOS pipe Mn2 and Mn4 form the second current mirror, PMOS pipe Mp3 and Mp4 form the 3rd current mirror, wherein, the drain electrode of Mp1 is connected to the grid of Mn1 and the grid of drain electrode and Mn3, the drain electrode of Mn3 is connected to the grid of Mp3 and the grid of drain electrode and Mp4, the drain electrode of Mp2 is connected to the grid of Mn2 and the grid of drain electrode and Mn4, the output node that the drain electrode of Mp4 and the drain electrode of Mn4 link together as symmetric form operational amplifier is to control the first power drive pipe.
6. linear voltage stabilization as claimed in claim 5 source, wherein, the electric current of charging transistor mirror image PMOS pipe Mp3 and Mp4.
7. linear voltage stabilization as claimed in claim 6 source, wherein, symmetric form operational amplifier also comprises that the input power and the PMOS that are connected in linear voltage stabilization source manage the current source between Mp1 and the source electrode tie point of Mp2, and the input power in linear voltage stabilization source is the power supply of outside input.
8. the linear voltage stabilization source as described in one of claim 1～7, also comprises soft-start mode gauge tap, and SS (soft start) control circuit is controlled soft-start mode gauge tap with the power drive pipe in disconnection or conducting output-stage circuit.
9. the linear voltage stabilization source as described in one of claim 1～7, wherein, SS (soft start) control circuit is included in operational amplifier.
10. the linear voltage stabilization source as described in one of claim 1～7, wherein, power drive pipe in output-stage circuit and the first power drive pipe are PMOS pipe, and the ratio of the power drive pipe in output-stage circuit and the breadth length ratio of the first power drive pipe is M, M>1.
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| CN201310597266.4A CN103729007B (en) | 2013-11-22 | 2013-11-22 | There is the linear stable of SS (soft start) control circuit |
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| CN201310597266.4A CN103729007B (en) | 2013-11-22 | 2013-11-22 | There is the linear stable of SS (soft start) control circuit |
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| CN103729007A true CN103729007A (en) | 2014-04-16 |
| CN103729007B CN103729007B (en) | 2016-08-17 |
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| CN106505849A (en) * | 2016-12-24 | 2017-03-15 | 成都卓创科微电子有限公司 | A kind of controllable linear soft starting circuit of time |
| CN107678481A (en) * | 2017-10-09 | 2018-02-09 | 东莞市翔实信息科技有限公司 | Unmanned photoelectricity soft-sphere model constant-current circuit, integrated circuit and control system |
| CN107704005A (en) * | 2017-09-29 | 2018-02-16 | 湖南国科微电子股份有限公司 | Negative voltage linear stable |
| CN108037788A (en) * | 2018-01-18 | 2018-05-15 | 上海艾为电子技术股份有限公司 | A kind of LDO circuit |
| CN108541309A (en) * | 2016-11-22 | 2018-09-14 | 深圳市汇顶科技股份有限公司 | Low voltage difference stable-pressure device |
| CN109995331A (en) * | 2017-12-29 | 2019-07-09 | 北京同方微电子有限公司 | A kind of voltage regulator circuit for thering is soft start to protect |
| TWI672573B (en) * | 2018-10-12 | 2019-09-21 | 大陸商長江存儲科技有限責任公司 | LDO regulator using NMOS transistor |
| TWI673594B (en) * | 2018-06-25 | 2019-10-01 | 大陸商北京集創北方科技股份有限公司 | Low-dropout linear regulator that controls soft-start overshoot |
| CN112783248A (en) * | 2020-12-31 | 2021-05-11 | 上海艾为电子技术股份有限公司 | Voltage modulator and electronic equipment |
| CN116430938A (en) * | 2023-06-12 | 2023-07-14 | 上海海栎创科技股份有限公司 | Soft start control module, system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108541309A (en) * | 2016-11-22 | 2018-09-14 | 深圳市汇顶科技股份有限公司 | Low voltage difference stable-pressure device |
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| CN108037788A (en) * | 2018-01-18 | 2018-05-15 | 上海艾为电子技术股份有限公司 | A kind of LDO circuit |
| TWI673594B (en) * | 2018-06-25 | 2019-10-01 | 大陸商北京集創北方科技股份有限公司 | Low-dropout linear regulator that controls soft-start overshoot |
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| TWI672573B (en) * | 2018-10-12 | 2019-09-21 | 大陸商長江存儲科技有限責任公司 | LDO regulator using NMOS transistor |
| CN112783248A (en) * | 2020-12-31 | 2021-05-11 | 上海艾为电子技术股份有限公司 | Voltage modulator and electronic equipment |
| CN116430938A (en) * | 2023-06-12 | 2023-07-14 | 上海海栎创科技股份有限公司 | Soft start control module, system and method |
| CN116430938B (en) * | 2023-06-12 | 2023-09-12 | 上海海栎创科技股份有限公司 | Soft start control module, system and method |
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