CN208351359U - Low pressure difference linear voltage regulator based on capacitive load - Google Patents
Low pressure difference linear voltage regulator based on capacitive load Download PDFInfo
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- CN208351359U CN208351359U CN201820735041.9U CN201820735041U CN208351359U CN 208351359 U CN208351359 U CN 208351359U CN 201820735041 U CN201820735041 U CN 201820735041U CN 208351359 U CN208351359 U CN 208351359U
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Abstract
The utility model discloses a kind of low pressure difference linear voltage regulators based on capacitive load, including operational amplifier, the first field-effect tube, the second field-effect tube, the first current source, the second current source and output capacitance；The output end of the grid connection operational amplifier of first field-effect tube, the reverse input end of the source electrode connection operational amplifier of the first field-effect tube are simultaneously grounded by the first current source；The output end of the grid connection operational amplifier of second field-effect tube, the source electrode of the second field-effect tube pass through the second current source and output capacitance ground connection respectively.It, can be by the way that the second field-effect tube be arranged outside control loop, so that the variation of load no longer influences the stability of control loop, to guarantee control loop stable operation using the utility model.
Description
Technical field
The utility model relates to electronic circuit technology field more particularly to a kind of low pressure difference linearity based on capacitive load are steady
Depressor.
Background technique
LDO, that is, low dropout regulator is a kind of low pressure difference linear voltage regulator, using in its linear region
The transistor or field-effect tube (FET) of operation subtract the voltage of excess from the input voltage of application, generate defeated through what is overregulated
Voltage out.
As shown in Figure 1, the output of conventional low difference linear constant voltage regulator is in whole loop, load variation has stability
Large effect.Specifically, the power tube of a source follower form is provided only in traditional low pressure difference linear voltage regulator,
In, the dominant pole of power tube is in inside, and secondary pole is in outside.In order to drive relatively large load, output capacitance is generally bigger；But
It is that when light load, secondary pole is easily entered in bandwidth, to influence stability.
Utility model content
That technical problem to be solved by the utility model is to provide a kind of structures is simple, stability is strong based on capacitive
The low pressure difference linear voltage regulator of load can effectively ensure that the stability of control loop.
In order to solve the above-mentioned technical problem, the utility model provides a kind of low pressure difference linearity pressure stabilizing based on capacitive load
Device, including operational amplifier, the first field-effect tube, the second field-effect tube, the first current source, the second current source and output capacitance；
The source electrode connection operation of the output end of the grid connection operational amplifier of first field-effect tube, first field-effect tube is put
The reverse input end of big device is simultaneously grounded by the first current source；The grid of second field-effect tube connects the defeated of operational amplifier
Outlet, the source electrode of second field-effect tube pass through the second current source and output capacitance ground connection respectively.
As an improvement of the above scheme, the low pressure difference linear voltage regulator based on capacitive load further includes compensating electric capacity,
The output end of the operational amplifier is grounded by compensating electric capacity.
As an improvement of the above scheme, first field-effect tube is identical as the second field-effect tube structure.
As an improvement of the above scheme, first field-effect tube is enhanced P-channel isolated gate FET.
As an improvement of the above scheme, second field-effect tube is enhanced P-channel isolated gate FET.
As an improvement of the above scheme, the drain electrode of first field-effect tube connects applied signal voltage.
As an improvement of the above scheme, the drain electrode of second field-effect tube connects applied signal voltage.
As an improvement of the above scheme, the in-phase output end of the operational amplifier connects power supply.
Implement the utility model has the beneficial effects that:
Low pressure difference linear voltage regulator of the utility model based on capacitive load include operational amplifier, the first field-effect tube,
Second field-effect tube, the first current source, the second current source and output capacitance, structure are simple.Specifically, the utility model draws simultaneously
Entering two field-effect tube (the first field-effect tube and the second field-effect tube), wherein the first field-effect tube is arranged in control loop,
Second field-effect tube is arranged outside control loop.When work, load current is provided by the second field-effect tube in the utility model, and
Second field-effect tube and the first field-effect tube match and share same gate bias voltage.Since output voltage depends on benchmark
Bias voltage, and load not in control loop, therefore the variation loaded will not influence control loop stability, so that control
The stability of loop processed is very good.
In addition, due to the output impedance of the first field-effect tube in control loop be it is stable, so only need to by one compared with
Small compensating electric capacity is put into operational amplifier output terminal, at this time dominant pole with regard to scene effect pipe grid, and secondary pole will
Much larger than bandwidth, it is greatly improved the stability of control loop.
Simultaneously as the gate bias of field-effect tube completely by operational amplifier export provide, and the first field-effect tube and
Second field-effect tube is identical, therefore output voltage is essentially identical, also ensures that stable output voltage values.
Detailed description of the invention
Fig. 1 is the electrical block diagram of conventional low difference linear constant voltage regulator；
Fig. 2 is the electrical block diagram of low pressure difference linear voltage regulator of the utility model based on capacitive load.
Specific embodiment
It is practical new to this below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
Type is described in further detail.Only this state, the present invention occur in the text or will occur up, down, left, right, before and after,
The orientation such as inside and outside word is not to specific restriction of the invention only on the basis of attached drawing of the invention.
Referring to fig. 2, Fig. 2 shows the circuit structure of the low pressure difference linear voltage regulator the present invention is based on capacitive load, packet
Include operational amplifier D, the first field-effect tube Q1, the second field-effect tube Q2, the first current source I1, the second current source I2 and output electricity
Hold C2；The in-phase output end of the operational amplifier D connects power supply VB；The grid connection operation of the first field-effect tube Q1 is put
The output end of big device D, the reverse input end of the source electrode connection operational amplifier D of the first field-effect tube Q1 simultaneously pass through the first electricity
Stream source I1 ground connection, the drain electrode of the first field-effect tube Q1 meet applied signal voltage Vin；The grid of the second field-effect tube Q2
The output end of operational amplifier D is connected, the source electrode of the second field-effect tube Q2 passes through the second current source I2 and output electricity respectively
Hold C2 ground connection, the drain electrode of the second field-effect tube Q2 meets applied signal voltage Vin.
The output of conventional low difference linear constant voltage regulator is in control loop, and load variation has biggish shadow to stability
It rings.Unlike the prior art, the utility model introduces two field-effect tube simultaneously, wherein the first field-effect tube Q1 setting
In control loop, the second field-effect tube Q2 is arranged outside control loop.
When work, load current is provided by the second field-effect tube Q2 in the utility model, and the second field-effect tube Q2 and
One field-effect tube Q1 matches and shares same gate bias voltage.Since output voltage depends on reference offset voltage, and it is negative
It carries not in control loop, therefore the variation loaded will not influence control loop stability, so that the stabilization of control loop
Property is very good.
Correspondingly, the low pressure difference linear voltage regulator based on capacitive load further includes compensating electric capacity C1, and the operation is put
The output end of big device D is grounded by compensating electric capacity C1.
It should be noted that due to the output impedance of the first field-effect tube Q1 in control loop be it is stable, so only
As soon as operational amplifier D output end need to be put into a lesser compensating electric capacity C1, at this time the grid of dominant pole scene effect pipe
Pole, and secondary pole will be much larger than bandwidth, be greatly improved the stability of control loop.
Further, the first field-effect tube Q1 is identical as the second field-effect tube Q2 structure.Specifically, first effect
Should pipe Q1 be preferably enhanced P-channel isolated gate FET, the second field-effect tube Q2 is preferably the insulation of enhanced P-channel
Gate field-effect transistor.
It is provided since the gate bias of field-effect tube is exported by operational amplifier D completely, and the first field-effect tube Q1 and the
Two field-effect tube Q2 are identical, therefore output voltage is essentially identical, also ensure that stable output voltage values.
From the foregoing, it will be observed that the utility model is outside control loop by being arranged the second field-effect tube Q2, so that the variation of load
It will not influence control loop stability, so that the stability of control loop is very good.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It is considered as the protection scope of the utility model.
Claims (8)
1. a kind of low pressure difference linear voltage regulator based on capacitive load, which is characterized in that including operational amplifier, the first field-effect
Pipe, the second field-effect tube, the first current source, the second current source and output capacitance；
The output end of the grid connection operational amplifier of first field-effect tube, the source electrode of first field-effect tube connect fortune
It calculates the reverse input end of amplifier and is grounded by the first current source；
The output end of the grid connection operational amplifier of second field-effect tube, the source electrode of second field-effect tube lead to respectively
Cross the second current source and output capacitance ground connection.
2. as described in claim 1 based on the low pressure difference linear voltage regulator of capacitive load, which is characterized in that further include compensation electricity
Hold, the output end of the operational amplifier is grounded by compensating electric capacity.
3. as described in claim 1 based on the low pressure difference linear voltage regulator of capacitive load, which is characterized in that first effect
It should manage identical as the second field-effect tube structure.
4. as described in claim 1 based on the low pressure difference linear voltage regulator of capacitive load, which is characterized in that first effect
It should manage as enhanced P-channel isolated gate FET.
5. as described in claim 1 based on the low pressure difference linear voltage regulator of capacitive load, which is characterized in that second effect
It should manage as enhanced P-channel isolated gate FET.
6. as described in claim 1 based on the low pressure difference linear voltage regulator of capacitive load, which is characterized in that first effect
Should the drain electrode of pipe connect applied signal voltage.
7. as described in claim 1 based on the low pressure difference linear voltage regulator of capacitive load, which is characterized in that second effect
Should the drain electrode of pipe connect applied signal voltage.
8. as described in claim 1 based on the low pressure difference linear voltage regulator of capacitive load, which is characterized in that the operation amplifier
The in-phase output end of device connects power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820735041.9U CN208351359U (en) | 2018-05-16 | 2018-05-16 | Low pressure difference linear voltage regulator based on capacitive load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820735041.9U CN208351359U (en) | 2018-05-16 | 2018-05-16 | Low pressure difference linear voltage regulator based on capacitive load |
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| CN208351359U true CN208351359U (en) | 2019-01-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111813172A (en) * | 2020-07-10 | 2020-10-23 | 日照志芯源电子科技有限公司 | Linear voltage stabilizer applied to digital-to-analog converter |
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2018
- 2018-05-16 CN CN201820735041.9U patent/CN208351359U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111813172A (en) * | 2020-07-10 | 2020-10-23 | 日照志芯源电子科技有限公司 | Linear voltage stabilizer applied to digital-to-analog converter |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191120 Address after: Room 303a, 3 / F, west block, phase II, design city, No.1, Sanle Road North, Beijiao Town, Shunde District, Foshan City, Guangdong Province 528300 Patentee after: Guangdong Huaxin Weite integrated circuit Co., Ltd Address before: 528000 Foshan 10, 501, Li He science and technology industrial center, 99 Taoyuan East Road, Shihan Town, Nanhai District, Foshan, China. Patentee before: Foshan Synwit Technology Co., Ltd. |
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| TR01 | Transfer of patent right |