CN208351364U - A kind of linear voltage-stabilizing circuit - Google Patents
A kind of linear voltage-stabilizing circuit Download PDFInfo
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- CN208351364U CN208351364U CN201821107465.7U CN201821107465U CN208351364U CN 208351364 U CN208351364 U CN 208351364U CN 201821107465 U CN201821107465 U CN 201821107465U CN 208351364 U CN208351364 U CN 208351364U
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Abstract
The application discloses a kind of linear voltage-stabilizing circuit, comprising: charge pump, error amplifying unit, compensation network, partial pressure unit, power tube, output adjust capacitor and system load；By increasing charge pump, the control terminal of the output end connection power tube of charge pump, so as to increase the voltage range of power tube control terminal；And the error amplifying unit can carry out high-voltage modulation to the power tube control terminal voltage after increase, to extend the output area of linear voltage-stabilizing circuit；The addition of the error amplifying unit is so that the linear voltage-stabilizing circuit in the utility model has two stage gains, intermediate frequency zero compensation time pole is generated by compensation network, to guarantee the stability of control loop, and since the gate voltage range of power tube increases, it can be when increasing the output voltage range of linear voltage-stabilizing circuit, also it can guarantee power tube work in saturation region, so that linear voltage regulator has high-precision output characteristic.
Description
Technical field
The utility model relates to Analogical Circuit Technique field more particularly to a kind of linear voltage-stabilizing circuits.
Background technique
LDO (Low Dropout Regulator, low pressure difference linear voltage regulator) is simple with circuit structure, occupies chip
Area is small and low noise advantages, it has also become the important component in power management chip.Linear voltage regulator can be modulus
The noise-sensitive circuits such as conversion circuit and radio circuit provide the power supply of high-precision, low noise, and due to the relatively simple structure,
Peripheral component is few, thus is widely used in on-chip system chip.
Fig. 1 is the linear voltage-stabilizing circuit of traditional N-type power MOS pipe.Wherein, VREFFor reference voltage, VFBFor VOUTPoint
Sampled voltage is pressed, which is acted on by the negative-feedback regu- lation of operational amplifier OP01 and power tube MN01, so that
VFB=VREF, therefore VOUT=VFB* (R01+R02)/R02=VREF* (R01+R02)/R02, can be obtained and not become with load current
That changes stabilizes the output voltage VOUT。
But the defect of linear voltage-stabilizing circuit in the prior art is output end voltage VOUTOutput area will receive greatly
Limitation, and precision is lower.
Utility model content
In view of this, the present invention provides a kind of linear voltage-stabilizing circuits, to solve to limit voltage regulator circuit in the prior art
Output voltage output area is limited and problem that precision is lower.
To achieve the above object, the utility model provides the following technical solutions:
A kind of linear voltage-stabilizing circuit, comprising:
Charge pump, error amplifying unit, compensation network, partial pressure unit, power tube, output adjust capacitor and system load；
The partial pressure unit includes the first resistor and second resistance being sequentially connected in series, the first resistor and second resistance
Common end is connected with the inverting input terminal of the error amplifying unit, the one end of the first resistor far from the second resistance with
The first end of the power tube is connected, and the second resistance is grounded far from one end of the first resistor；
The control terminal of the power tube and the output end of the charge pump and the output end phase of the error amplifying unit
Even；
The second end of the power tube is used to receive the input of supply voltage；
Output end of the first end of the power tube as the linear voltage-stabilizing circuit, and connect the output and adjust capacitor
One end and one end of the system load, the other end of the output adjusting capacitor and the other end of the system load are equal
Ground connection；
The input terminal of the charge pump is used to receive the output voltage of the linear voltage-stabilizing circuit；
The non-inverting input terminal of the error amplifying unit receives the input of reference voltage；
The inverting input terminal of the error amplifying unit is connected by compensation network with the first end of the power tube, described
Compensation network is for generating intermediate frequency zero point；
The power input of the error amplifying unit receives the output voltage of the linear voltage-stabilizing circuit.
Preferably, the power tube is NMOS tube.
Preferably, the error amplifying unit includes:
Electric current turns high-voltage modulation module and operational amplifier.
Preferably, the operational amplifier includes:
First switch tube, second switch, third switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube and electricity
Stream source；
The control terminal of the first switch tube receives the input of reference voltage；
The first end of the first switch tube is connected with the first end of the second switch, and is connected to the third and opens
Close the second end of pipe；
The second end of the first switch tube is connect with the second end of the 5th switching tube, and turns high pressure with the electric current
The input terminal of modulation module is connected；
The control terminal of the second switch connects the common end of the first resistor and the second resistance；
The second end of the second switch connects the second end and control terminal of the 6th switching tube；
The first end of 6th switching tube and the first end of the 5th switching tube are grounded；
The control terminal of the third switching tube is connected with the control terminal of the 4th switching tube and second end；
The first end of the third switching tube is connected with the first end of the 4th switching tube, and receives the linear voltage stabilization
The input of the output end voltage of circuit；
The second end of 4th switching tube is grounded by the current source.
Preferably, it includes: the 7th switching tube and the 8th switching tube that the electric current, which turns high-voltage modulation module,；
The control terminal of 7th switching tube is connected with the control terminal of the 4th switching tube；
The first end of 7th switching tube is connected with the first end of the 8th switching tube；
The second end of 7th switching tube is connected with the output end of the charge pump；
The control terminal of 8th switching tube is connected with the second end of the 5th switching tube；
The second end of 8th switching tube is grounded.
Preferably, the first switch tube, the second switch, the third switching tube, the 4th switching tube and
8th switching tube is PMOS tube；
5th switching tube, the 6th switching tube and the 7th switching tube are NMOS tube.
Preferably, the first end is source electrode, and the second end is drain electrode, and the control terminal is grid.
Preferably, the compensation network includes feed-forward capacitance, and one end of the feed-forward capacitance connects the of the power tube
One end；The other end of the feed-forward capacitance connects the inverting input terminal of the error amplifying unit.
It can be seen via above technical scheme that linear voltage-stabilizing circuit provided by the utility model, comprising: charge pump, error
Amplifying unit, compensation network, partial pressure unit, power tube, output adjust capacitor and system load；By increasing charge pump, charge
The control terminal of the output end connection power tube of pump, so as to increase the voltage range of power tube control terminal；And the error is put
Big unit can carry out high-voltage modulation to power tube control terminal voltage, to extend the output area of linear voltage-stabilizing circuit；Institute
The addition of error amplifying unit is stated so that the linear voltage-stabilizing circuit in the utility model is produced with two stage gains by compensation network
Raw intermediate frequency zero compensation time pole, to guarantee the stability of control loop, and since the gate voltage range of power tube increases,
It can also can guarantee power tube work in saturation region, so that line when increasing the output voltage range of linear voltage-stabilizing circuit
Property voltage-stablizer have high-precision output characteristic.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the linear voltage-stabilizing circuit schematic diagram of N-type power MOS pipe traditional in the prior art；
Fig. 2 is a kind of linear voltage-stabilizing circuit structural schematic diagram provided by the embodiment of the utility model；
Fig. 3 is a kind of linear voltage-stabilizing circuit structural schematic diagram that another embodiment of the utility model provides；
Fig. 4 is a kind of linear voltage-stabilizing circuit structural schematic diagram that another embodiment of the utility model provides.
Specific embodiment
Just as described in the background section, output end voltage V in the prior artOUTOutput area will receive very big limit
System, and the output accuracy of linear voltage-stabilizing circuit is lower.
Inventors have found that the reason of above-mentioned phenomenon occur is, and in the prior art, the power supply power supply side of operational amplifier OP01
Formula is single supply power supply mode, namely as shown in fig. 1, by supply voltage VINPower supply, therefore, the maximum of operational amplifier OP01
Output voltage is VIN, to make power tube MN01 work in saturation region, then the output voltage V of linear voltage-stabilizing circuitOUTThe upper limit
Are as follows:
Wherein, VG01For the grid voltage of MN01, VGSN01For the gate source voltage of MN01 pipe, WN01For the ditch road width of MN01 pipe
Degree, LN01For the channel length of MN01 pipe, unFor the n-type doping carrier drift rate in MN01 pipe, CoxFor grid oxygen capacitor, VthnFor
The threshold voltage of MN01 pipe, ILOADFor load current.
It can be obtained by formula (1), as load current ILOADWhen bigger, VOUTThe upper limit value V of outputOUT_MAXCan be smaller, therefore
For traditional linear voltage-stabilizing circuit, load current ILOADIt is bigger, maximum exportable burning voltage VOUT_MAXIt is smaller.
Since when the work of MN01 pipe is at saturation region, gain is maximum, so that output accuracy is higher, work is being saturated
Area, and V in the prior artOUT=VG01-VGSN01, since the maximum output of operational amplifier OP1 is VINNamely VG01It is up to VIN
When, when needing to increase VOUTOutput area when, the gate source voltage V of MN01 pipeGSN01It needs to reduce, so that MN01 pipe works
In non-saturated region, gain will reduce, so that output accuracy is lower.
Based on this, the utility model provides a kind of linear voltage-stabilizing circuit, comprising:
Charge pump, error amplifying unit, compensation network, partial pressure unit, power tube, output adjust capacitor and system load；
The partial pressure unit includes the first resistor and second resistance being sequentially connected in series, the first resistor and second resistance
Common end is connected with the inverting input terminal of the error amplifying unit, the one end of the first resistor far from the second resistance with
The first end of the power tube is connected, and the second resistance is grounded far from one end of the first resistor；
The control terminal of the power tube and the output end of the charge pump and the output end phase of the error amplifying unit
Even；
The second end of the power tube is used to receive the input of supply voltage；
Output end of the first end of the power tube as the linear voltage-stabilizing circuit, and connect the output and adjust capacitor
One end and one end of the system load, the other end of the output adjusting capacitor and the other end of the system load are equal
Ground connection；
The input terminal of the charge pump is used to receive the output voltage of the linear voltage-stabilizing circuit；
The non-inverting input terminal of the error amplifying unit receives the input of reference voltage；
The inverting input terminal of the error amplifying unit is connected by compensation network with the first end of the power tube, described
Compensation network is for generating intermediate frequency zero point；
The power input of the error amplifying unit receives the output voltage of the linear voltage-stabilizing circuit.
Linear voltage-stabilizing circuit provided by the utility model, comprising: charge pump, error amplifying unit, compensation network, partial pressure are single
Member, power tube, output adjust capacitor and system load；By increasing charge pump, the control of the output end connection power tube of charge pump
End processed, so as to increase the voltage range of power tube control terminal；And the error amplifying unit can be to power tube control terminal
Voltage carries out high-voltage modulation, to extend the output area of linear voltage-stabilizing circuit；The addition of the error amplifying unit so that
Linear voltage-stabilizing circuit in the utility model has two stage gains, generates intermediate frequency zero compensation time pole by compensation network, comes
Guarantee the stability of control loop, and since the gate voltage range of power tube increases, linear voltage-stabilizing circuit can increased
Output voltage range when, also can guarantee power tube work in saturation region so that linear voltage regulator have it is high-precision defeated
Feature out.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 2 is referred to, Fig. 2 is a kind of linear voltage-stabilizing circuit structural schematic diagram provided by the embodiment of the utility model；This reality
Include: with the linear voltage-stabilizing circuit that new embodiment provides
Charge pump 10, error amplifying unit 20, compensation network 30, partial pressure unit 40, power tube 50, output adjust capacitor Co
With system load 60.
Wherein, the effect of charge pump 10 is to generate 2V in the present embodimentOUTMultiplication of voltage voltage, improve VG1Voltage range；Accidentally
Mistake difference amplifying unit 20 improves loop gain, makes V by negative-feedback regu- lationSNS=VREF；The effect of compensation network 30 is to increase
Add zero pole point pair, so that the loop response characteristic of negative-feedback meets stability requirement；The effect of partial pressure unit 40 is to output electricity
Pressure is divided, so that VSNS=R1*VOUT/(R1+R2)；The effect of power tube 50 is to make VOUTBigger electric current can be exported；It is defeated
Adjusting the effect of capacitor Co out is to stabilize the output voltage and system load 60.
It should be noted that the concrete type of power tube 50 is not limited in the present embodiment, in a reality of the utility model
It applies in example, power tube 50 can be PMOS tube, and in the other embodiments of the utility model, power tube 60 can also be NMOS
It manages, is not limited this in the present embodiment, in the present embodiment optionally, power tube 50 is NMOS tube, as shown in Figure 2, power
Pipe 50 is MN1 pipe.
In the present embodiment, partial pressure unit 40 includes the first resistor R1 and second resistance R2 being sequentially connected in series, first resistor R1
It is connected with the common end of second resistance R2 with the inverting input terminal of error amplifying unit 20, first resistor R1 is far from second resistance R2
One end be connected with the first end of power tube MN1, second resistance R2 far from first resistor R1 one end be grounded；
The control terminal of power tube MN1 is connected with the output end of the output end of charge pump 10 and error amplifying unit 20；
The second end of power tube MN1 is for receiving supply voltage VINInput；
Output end V of the first end of power tube MN1 as linear voltage-stabilizing circuitOUT, and connect output and adjust the one end capacitor Co
And one end of system load 60, output adjusts the other end of capacitor Co and the other end of system load 60 is grounded；
The input terminal of charge pump 10 is used to receive the output voltage V of linear voltage-stabilizing circuitOUT；
The non-inverting input terminal of error amplifying unit 20 receives reference voltage VREFInput；
The inverting input terminal of error amplifying unit 20 is connected by compensation network 30 with the first end of power tube MN1, is compensated
Network 30 is for generating intermediate frequency zero point；
The power input of error amplifying unit 20 receives the output voltage V of linear voltage-stabilizing circuitOUT。
As shown in Figure 2, the effect of charge pump 10 is by the input terminal voltage V of charge pump 10OUTNamely linear voltage stabilization electricity
Driving voltage V after the output end voltage multiplication of voltage on road as the control terminal of power tube MN1G1.The effect of error amplifying unit 20 is
The voltage V of the control terminal of regulation power pipe MN1G1, so that the inverting input terminal voltage of error amplifying unit 20 with mutually defeated
Enter and hold voltage equal, that is, the sampled voltage V of partial pressure unit 40SNSWith reference voltage VREFIt is identical.The two mutually combines afterwards,
Charge pump 10 improves the driving voltage V of the control terminal of power tube MN1G1Afterwards, by the modulation of error amplifying unit 20, so that power
The driving voltage V of the control terminal of pipe MN1G1Maximum output voltage V afterwardsG1_MAXFor 2VOUT.At this point, the output of linear voltage-stabilizing circuit
Voltage VOUTMaximum output are as follows:
Wherein, VG1For the grid voltage of MN1, VGSN1For the gate source voltage of MN1 pipe, WN1For the channel width of MN1 pipe, LN1
For the channel length of MN1 pipe, unFor the n-type doping carrier drift rate in MN1 pipe, CoxFor grid oxygen capacitor, VTHNFor MN1 pipe
Threshold voltage, ILOADFor load current.
Continuing with referring to fig. 2, the concrete operating principle of linear voltage-stabilizing circuit includes: to work as V in the present embodimentOUT<VREF*(R1+
R2)/R2 when, VSNS<VREF, the driving voltage V of the control terminal of the modulation power pipe MN1 of the meeting of error amplifying unit 20 at this timeG1Make its liter
Height, to make the output voltage V of linear voltage-stabilizing circuitOUTIt increases, and gradually adjusts to VSNS=VREF, there is V at this timeOUT=VREF*
(R1+R2)/R2.Conversely, working as VOUT>VREF* when (R1+R2)/R2, VSNS>VREF, error amplifying unit 20 can modulation power pipe at this time
The driving voltage V of the control terminal of MN1G1Make its reduction, to make the output voltage V of linear voltage-stabilizing circuitOUTIt reduces, and gradually adjusts
It is whole to VSNS=VREF, there is V at this timeOUT=VREF*(R1+R2)/R2。
It should be noted that the not specific structure of limit error amplifying unit in the present embodiment, as long as can play to electricity
The output voltage of lotus pump carries out the error amplifying unit of high-voltage modulation, such as can be wide scope operational amplifier.May be used also
To be, structure as shown in Figure 3, Fig. 3 is a kind of linear voltage-stabilizing circuit structural representation that another embodiment of the utility model provides
Figure；Error amplifying unit includes: that electric current turns high-voltage modulation module 201 and operational amplifier OP in the present embodiment.
In the present embodiment, operational amplifier OP includes:
First switch tube MP1, second switch MP2, third switching tube, the 4th switching tube MP4, the 5th switching tube MN2,
Six switching tube MN3 and current source IB；
The control terminal of first switch tube MP1 receives the input of reference voltage；
The first end of first switch tube MP1 is connected with the first end of second switch MP2, and is connected to third switching tube
The second end of MP3；
The second end of first switch tube MP1 is connect with the second end of the 5th switching tube MN2, and turns high-voltage modulation mould with electric current
The input terminal of block 201 is connected；
The common end of control terminal connection the first resistor R1 and second resistance R2 of second switch MP2；
The second end of second switch MP2 connects the second end and control terminal of the 6th switching tube MN3；
The first end of 6th switching tube MN3 and the first end of the 5th switching tube MN2 are grounded；
The control terminal of third switching tube MP3 is connected with the control terminal of the 4th switching tube MP4 and second end；
The first end of third switching tube MP3 is connected with the first end of the 4th switching tube MP4, and receives linear voltage-stabilizing circuit
Output end voltage VOUTInput；
The second end of 4th switching tube MP4 is grounded by current source IB.
Current limit does not turn the specific structure of high-voltage modulation module in the present embodiment, optionally, as shown in figure 4, Fig. 4 is this
A kind of linear voltage-stabilizing circuit structural schematic diagram that the another embodiment of utility model provides；Wherein, electric current turns high-voltage modulation module 201
It include: the 7th switching tube MN4 and the 8th switching tube MP5；
The control terminal of 7th switching tube MN4 is connected with the control terminal of the 4th switching tube MP4；
The first end of 7th switching tube MN4 is connected with the first end of the 8th switching tube MP5；
The second end of 7th switching tube MN4 is connected with the output end of charge pump 10；
The control terminal of 8th switching tube MP5 is connected with the second end of the 5th switching tube MN2；
The second end of 8th switching tube MP5 is grounded.
It should be noted that as shown in Figure 3 and Figure 4, compensation network 30 is optionally feed-forward capacitance Cfb in the present embodiment,
Feed-forward capacitance compensates time pole for generating intermediate frequency zero point.
It should be noted that the concrete type of each switching tube is not limited in the utility model embodiment, it is optionally, described
First switch tube, the second switch, the third switching tube, the 4th switching tube and the 8th switching tube are
PMOS tube；Namely in Fig. 3 and Fig. 4, first switch tube MP1, second switch MP2, third switching tube MP3, the 4th switching tube
MP4 and the 8th switching tube MP5 is PMOS tube, wherein it is the leakage of PMOS tube that first end, which is the source electrode of PMOS tube, second end,
Pole, control terminal are the grid of PMOS tube.
5th switching tube, the 6th switching tube and the 7th switching tube are NMOS tube, namely such as Fig. 3 and figure
In 4, the 5th switching tube MN2, the 6th switching tube MN3 and the 7th switching tube MN4 are NMOS tube, wherein first end is NMOS
The source electrode of pipe, second end are the drain electrode of NMOS tube, and control terminal is the grid of NMOS tube.
It should be noted that the 7th switching tube MN4 can be according to the grid voltage V of power tube MN1 in the present embodimentG1Most
Big voltage replaces with high-voltage MOS pipe, in order to protect the 8th switching tube MP5 not breakdown.
According to the compensation of feed-forward capacitance, the gain of linear voltage-stabilizing circuit in the present embodiment are as follows:
Wherein, Aloop_gainFor the loop gain of linear voltage-stabilizing circuit provided by the utility model, gmP1,gmP3,gmN4Respectively
For first switch tube MP1, third switching tube MP3, the mutual conductance of the 4th switching tube MN4 pipe, roP1,roN2,roN4Respectively first switch
Pipe MP1, the 5th switching tube MN2, the equivalent output impedance of the 7th switching tube MN4, roCHGFor the equivalent output impedance of charge pump 10.
The linear voltage-stabilizing circuit of the utility model has two stage gains as available from the above equation, therefore has high-precision output characteristic.
And it is available according to formula (2), compared to the structure of prior art linear voltage-stabilizing circuit shown in FIG. 1, this reality
With the output voltage V of the linear voltage-stabilizing circuit provided in new embodimentOUTMaximum output voltage have very big promotion, even if
In load current ILOADWhen bigger, VOUTOutput also can achieve VIN。
The linear voltage-stabilizing circuit provided in the utility model embodiment, comprising: charge pump, error amplifying unit, compensation net
Network, partial pressure unit, power tube, output adjust capacitor and system load；By increasing charge pump, the output end of charge pump connects function
The control terminal of rate pipe, so as to increase the voltage range of power tube control terminal；And the error amplifying unit can be to increase
Power tube control terminal voltage afterwards carries out high-voltage modulation, to extend the output area of linear voltage-stabilizing circuit；The error is put
The addition of big unit is so that the linear voltage-stabilizing circuit in the utility model passes through compensation network and generate intermediate frequency zero with two stage gains
Point compensates time pole, to guarantee the stability of control loop, and since the gate voltage range of power tube increases, can increase
When the output voltage range of big linear voltage-stabilizing circuit, power tube work also can guarantee in saturation region, so that linear voltage regulator
With high-precision output characteristic.
It should be noted that the utility model embodiment is that charge pump is improved to the function of power tube gate voltage range,
And the function that error amplifying unit is able to carry out modulation to high pressure combines, to obtain the linear of high precision wide range output
Voltage regulator circuit.
And if increase setting charge pump in this prior art configuration, can be improved power tube gate voltage range, but by
Operational amplifier in technology is normal operation amplifier, high pressure can not be modulated, therefore, it is impossible to obtain high precision wide range
The linear voltage-stabilizing circuit of output.
Linear voltage-stabilizing circuit provided by the utility model has the output of high precision wide range, so as to be applied to over-voltage
In protection, linear regulator, charging chip, power management chip and power transfer circuitry, to this in concrete application the present embodiment
Without limitation.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that article or equipment including a series of elements not only include those elements, but also
It including other elements that are not explicitly listed, or further include for this article or the intrinsic element of equipment.Do not having
In the case where more limitations, the element that is limited by sentence "including a ...", it is not excluded that in the article including above-mentioned element
Or there is also other identical elements in equipment.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (8)
1. a kind of linear voltage-stabilizing circuit characterized by comprising
Charge pump, error amplifying unit, compensation network, partial pressure unit, power tube, output adjust capacitor and system load；
The partial pressure unit includes the first resistor and second resistance being sequentially connected in series, the first resistor and second resistance it is public
End be connected with the inverting input terminal of the error amplifying unit, the one end of the first resistor far from the second resistance with it is described
The first end of power tube is connected, and the second resistance is grounded far from one end of the first resistor；
The control terminal of the power tube is connected with the output end of the output end of the charge pump and the error amplifying unit；
The second end of the power tube is used to receive the input of supply voltage；
Output end of the first end of the power tube as the linear voltage-stabilizing circuit, and connect the output and adjust capacitor one end
And one end of the system load, the output adjusts the other end of capacitor and the other end of the system load connects
Ground；
The input terminal of the charge pump is used to receive the output voltage of the linear voltage-stabilizing circuit；
The non-inverting input terminal of the error amplifying unit receives the input of reference voltage；
The inverting input terminal of the error amplifying unit is connected by compensation network with the first end of the power tube, the compensation
Network is for generating intermediate frequency zero point；
The power input of the error amplifying unit receives the output voltage of the linear voltage-stabilizing circuit.
2. linear voltage-stabilizing circuit according to claim 1, which is characterized in that the power tube is NMOS tube.
3. linear voltage-stabilizing circuit according to claim 1, which is characterized in that the error amplifying unit includes:
Electric current turns high-voltage modulation module and operational amplifier.
4. linear voltage-stabilizing circuit according to claim 3, which is characterized in that the operational amplifier includes:
First switch tube, second switch, third switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube and electric current
Source；
The control terminal of the first switch tube receives the input of reference voltage；
The first end of the first switch tube is connected with the first end of the second switch, and is connected to the third switching tube
Second end；
The second end of the first switch tube is connect with the second end of the 5th switching tube, and turns high-voltage modulation with the electric current
The input terminal of module is connected；
The control terminal of the second switch connects the common end of the first resistor and the second resistance；
The second end of the second switch connects the second end and control terminal of the 6th switching tube；
The first end of 6th switching tube and the first end of the 5th switching tube are grounded；
The control terminal of the third switching tube is connected with the control terminal of the 4th switching tube and second end；
The first end of the third switching tube is connected with the first end of the 4th switching tube, and receives the linear voltage-stabilizing circuit
Output end voltage input；
The second end of 4th switching tube is grounded by the current source.
5. linear voltage-stabilizing circuit according to claim 4, which is characterized in that the electric current turns high-voltage modulation module and includes:
7th switching tube and the 8th switching tube；
The control terminal of 7th switching tube is connected with the control terminal of the 4th switching tube；
The first end of 7th switching tube is connected with the first end of the 8th switching tube；
The second end of 7th switching tube is connected with the output end of the charge pump；
The control terminal of 8th switching tube is connected with the second end of the 5th switching tube；
The second end of 8th switching tube is grounded.
6. linear voltage-stabilizing circuit according to claim 5, which is characterized in that the first switch tube, the second switch
Pipe, the third switching tube, the 4th switching tube and the 8th switching tube are PMOS tube；
5th switching tube, the 6th switching tube and the 7th switching tube are NMOS tube.
7. linear voltage-stabilizing circuit according to claim 6, which is characterized in that the first end is source electrode, the second end
For drain electrode, the control terminal is grid.
8. linear voltage-stabilizing circuit according to claim 1, which is characterized in that the compensation network includes feed-forward capacitance, institute
The one end for stating feed-forward capacitance connects the first end of the power tube；It is single that the other end of the feed-forward capacitance connects the error amplification
The inverting input terminal of member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821107465.7U CN208351364U (en) | 2018-07-12 | 2018-07-12 | A kind of linear voltage-stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821107465.7U CN208351364U (en) | 2018-07-12 | 2018-07-12 | A kind of linear voltage-stabilizing circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646841A (en) * | 2018-07-12 | 2018-10-12 | 上海艾为电子技术股份有限公司 | A kind of linear voltage-stabilizing circuit |
| CN110262610A (en) * | 2019-07-10 | 2019-09-20 | 上海艾为电子技术股份有限公司 | A kind of linear voltage regulator of power tube |
| CN111934540A (en) * | 2019-05-13 | 2020-11-13 | 北京兆易创新科技股份有限公司 | Charge pump voltage stabilizing circuit, voltage stabilizing method and nonvolatile memory |
| CN115185330A (en) * | 2022-08-18 | 2022-10-14 | 上海艾为电子技术股份有限公司 | LDO drive circuit, drive chip and electronic equipment |
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2018
- 2018-07-12 CN CN201821107465.7U patent/CN208351364U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646841A (en) * | 2018-07-12 | 2018-10-12 | 上海艾为电子技术股份有限公司 | A kind of linear voltage-stabilizing circuit |
| CN108646841B (en) * | 2018-07-12 | 2024-07-05 | 上海艾为电子技术股份有限公司 | Linear voltage stabilizing circuit |
| CN111934540A (en) * | 2019-05-13 | 2020-11-13 | 北京兆易创新科技股份有限公司 | Charge pump voltage stabilizing circuit, voltage stabilizing method and nonvolatile memory |
| CN111934540B (en) * | 2019-05-13 | 2021-10-01 | 北京兆易创新科技股份有限公司 | Charge pump voltage stabilizing circuit, voltage stabilizing method and nonvolatile memory |
| CN110262610A (en) * | 2019-07-10 | 2019-09-20 | 上海艾为电子技术股份有限公司 | A kind of linear voltage regulator of power tube |
| CN115185330A (en) * | 2022-08-18 | 2022-10-14 | 上海艾为电子技术股份有限公司 | LDO drive circuit, drive chip and electronic equipment |
| CN115185330B (en) * | 2022-08-18 | 2024-02-02 | 上海艾为电子技术股份有限公司 | LDO drive circuit, drive chip and electronic equipment |
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