CN107168439A - A kind of AB class driving stage circuit designs applied to Low dropout regulator - Google Patents
A kind of AB class driving stage circuit designs applied to Low dropout regulator Download PDFInfo
- Publication number
- CN107168439A CN107168439A CN201710416324.7A CN201710416324A CN107168439A CN 107168439 A CN107168439 A CN 107168439A CN 201710416324 A CN201710416324 A CN 201710416324A CN 107168439 A CN107168439 A CN 107168439A
- Authority
- CN
- China
- Prior art keywords
- drain electrode
- driving stage
- connects
- dropout regulator
- low dropout
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- G05F1/565—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
Abstract
The present invention proposes a kind of AB quasi-driver circuit designs applied to Low dropout regulator, belongs to Analogous Integrated Electronic Circuits technical field, specially a kind of AB classes driving stage circuit can export or absorb high current, including：Voltage detecting circuit and electric current supercircuit.Driving stage circuit can provide very big sink current to P-channel power tube grid, rapid to improve power tube grid potential；Simultaneously by detecting the decline of P-channel power tube grid circuit, dynamic improves the sourcing current of driving stage circuit, P-channel power tube grid potential is dragged down rapidly.
Description
Technical field
The present invention proposes a kind of AB class driving stage circuit designs applied to Low dropout regulator, belongs to simulation integrated
Field of circuit technology, specially a kind of AB classes driving stage circuit.
Background technology
In recent years integrated circuit development is swift and violent, and circuit level more and more higher, electronic functionalities integrated level becomes increasingly complex,
The growth of powder consumption of electronic equipment causes electronic equipment endurance to be deteriorated.Electronic equipment is rapidly switched off and waken up, electronics is improved and sets
Standby standby endurance, reduces power consumption, this needs feed regulator isolator can be with quick response load changing, and this allows for that tune can be improved
The appearance of the AB class driving stages of whole device transient response.
The content of the invention
The problem to be solved in the present invention is to propose that a kind of AB class driving stage circuits applied to Low dropout regulator are set
Meter, can export or absorb high current.
The present invention propose a kind of AB class driving stage circuit designs applied to Low dropout regulator, can export or
High current is absorbed, including：Voltage detecting circuit and electric current supercircuit.Driving stage circuit can be carried to P-channel power tube grid
It is rapid to improve power tube grid potential for very big sink current；Simultaneously by detecting the decline of P-channel power tube grid circuit,
Dynamic improves the sourcing current of driving stage circuit, and P-channel power tube grid potential is dragged down rapidly.
Brief description of the drawings
Fig. 1 is the integrated circuit of AB class driving stages.
Embodiment
To become apparent from the features described above and advantage of the present invention, below in conjunction with the accompanying drawings to the embodiment of the present invention
It is described in detail.
Mono- LDO of Fig. 1 simplification circuit theory diagrams, it is shown：Error amplifier EA, power tube MP, feedback resistance RF1-RF2
Feedback loop is constituted with driving stage M1-M2-M3-M4-M5-M6-M7, the purpose of output voltage VO voltage stabilizing is reached.Electric capacity Cout
For reducing output voltage ripple, generally electrolyte capacitance, electric capacity C1 is generally much smaller than Cout, with relatively low equivalent series
The high frequency characteristics of resistance improvement output voltage.
Driving stage M1-M2-M3-M4-M5-M6-M7 is the driving stage of AB classes, during output end load changing, and driving stage can be with
Output absorbs high current, quickly adjusts output voltage.Load RL from it is small to big transient state be mutated when：Output current reduces, VO
Raise, EA positive input terminal voltages are raised, and M1 grid potential is elevated, driving stage now exports a high current by MP grid to MP
Electrode potential is raised rapidly, and power tube MP output currents are matched with load current, output voltage stabilization.RL is loaded from greatly to micromutation
When：Output current increase, VO is dragged down, and EA positive input terminal voltage pull-downs, M1 grid potential is pulled low so that M1 source class current potential
Decline, after M7 detection M1 source class current potentials decline, the drain current on M5-M6-M7 roads can be increased and be added to M2's by current mirror
In drain current, so as to improve the absorption current capacity of driving stage, MP grid potential is dragged down rapidly, power tube output current
Increase, output voltage immediate stability.
The above described is only a preferred embodiment of the present invention, not making any formal limitation to the present invention.Appoint
What those skilled in the art, without departing from the scope of the technical proposal of the invention, all using the side of the disclosure above
Method and technology contents make many possible variations and modification to technical solution of the present invention, or are revised as the equivalent reality of equivalent variations
Apply example.Therefore, every content without departing from technical solution of the present invention, the technical spirit according to the present invention is done to above example
Any simple modifications, equivalents, and modifications, still fall within technical solution of the present invention protection in the range of.
Claims (6)
1. a kind of AB class driving stage circuit designs applied to Low dropout regulator, including：Voltage detecting circuit and electric current
Supercircuit, AB class driving stage circuits can export or absorb high current, so that when load changes towards different directions, adjustment
Device transient state output characteristics is symmetrical.
2. a kind of Low dropout regulator according to claim 1, it is characterised in that：Adjuster main feedback loop is by by mistake
Poor amplifier EA, driving stage circuit, power tube, feedback resistive network RF1-RF2 and output compensating electric capacity are constituted, error amplifier
EA negative input termination reference voltage V ref, positive input terminal connecting resistance RF2 anode, EA output connects driving tube M1 grid,
Whole driving stage circuit can export the latter and absorb high current.
3. a kind of Low dropout regulator according to claim 2, it is characterised in that tell that driving stage includes：M1's
Grid connects EA output end, and the source class that M1 drain electrode meets input power VIN, M1 connects M2 drain electrode and is connected to M7 and MP grid,
M2 source class connects M3 drain electrode and is connected to M4 drain electrode, and M3 source class connects low level, and M2 and M3 grid connect a biasing respectively
The drain electrode that voltage Vbias1 and Vbias2, M7 source class meet power supply VIN, M7 connects M6 drain electrode, and M6 source class connects M5 drain electrode, M6
Grid connect output pin Vo and power tube MP drain electrodes, M5 drain and gate short circuit and the grid for being connected to M4, M5 source class connect
Ground level, M4 drain electrode connects M2 source class, M4 source class earth level.
4. a kind of Low dropout regulator according to claim 3, it is characterised in that tell that power tube includes：MP's
Source class meets power supply VIN, and drain electrode connects feedback resistance RF1 anode and output pin VO.
5. a kind of Low dropout regulator according to claim 4, it is characterised in that tell that feedback resistance includes：RF1
Drain electrode connect power tube drain electrode and output pin, RF1 negative terminal connect RF2 anode and be connected to EA positive input terminal and compensation electricity
Hold C1 and resistance Resr anode, RF2 negative input end earth level.
6. a kind of Low dropout regulator according to claim 4, it is characterised in that tell that compensating electric capacity includes：Electricity
Resistance Resr is just terminating output pin VO, resistance Resr negative termination capacitor Cout anode, Cout negativing ending grounding level, electric capacity
C1 is just terminating output pin VO, and electric capacity C1 negativing ending grounding level, load resistance RL just terminates VO, negativing ending grounding level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710416324.7A CN107168439A (en) | 2017-06-06 | 2017-06-06 | A kind of AB class driving stage circuit designs applied to Low dropout regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710416324.7A CN107168439A (en) | 2017-06-06 | 2017-06-06 | A kind of AB class driving stage circuit designs applied to Low dropout regulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107168439A true CN107168439A (en) | 2017-09-15 |
Family
ID=59825743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710416324.7A Pending CN107168439A (en) | 2017-06-06 | 2017-06-06 | A kind of AB class driving stage circuit designs applied to Low dropout regulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107168439A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964448A (en) * | 2018-08-27 | 2018-12-07 | 重庆西南集成电路设计有限责任公司 | A kind of power generation circuit |
-
2017
- 2017-06-06 CN CN201710416324.7A patent/CN107168439A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964448A (en) * | 2018-08-27 | 2018-12-07 | 重庆西南集成电路设计有限责任公司 | A kind of power generation circuit |
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Legal Events
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170915 |