CN108107965A - A kind of digital linear voltage-stablizer based on double loop analog-to-digital conversion module - Google Patents
A kind of digital linear voltage-stablizer based on double loop analog-to-digital conversion module Download PDFInfo
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- CN108107965A CN108107965A CN201810163872.8A CN201810163872A CN108107965A CN 108107965 A CN108107965 A CN 108107965A CN 201810163872 A CN201810163872 A CN 201810163872A CN 108107965 A CN108107965 A CN 108107965A
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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
- G05F1/565—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
- G05F1/567—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 for temperature compensation
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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
- G05F1/565—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
- G05F1/569—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 for protection
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Abstract
The invention discloses a kind of digital linear voltage-stablizers based on double loop analog-to-digital conversion module, including switching tube group, current acquisition module, voltage acquisition module, first energy control module, second is made to make energy control module, the first analog-to-digital conversion module and the second analog-to-digital conversion module, switching tube group includes first switch pipe group and second switch pipe group；First makes energy control module export the first enable signal；First analog-to-digital conversion module exports first control signal；Second makes energy control module export the second enable signal；Second analog-to-digital conversion module exports second control signal.When load current changes, determine that first makes energy control module and second make the working condition of energy control module by current acquisition module, then corresponding switching tube is controlled, realizes that the transient state of output voltage is adjusted according to the comparison of feedback voltage and reference voltage using analog-to-digital conversion module.The digital linear voltage-stablizer that this hair provides, circuit topological structure is convenient and reliable, versatile.
Description
Technical field
The present invention relates to ic power technical fields, and double loop analog-to-digital conversion mould is based on more particularly, to one kind
The digital linear voltage-stablizer of block.
Background technology
Power-supply management system is the important component of most of electronic equipments, and electric energy is converted, distributed, examined by it
It surveys, after voltage stabilizing and noise reduction, provides a metastable operating voltage for subsequent conditioning circuit system, the good and bad of performance will be direct
Influence the safety and reliability of electronic equipment.It is big to the demand of power management class chip recently as international IC markets
Amplitude increases, and power management techniques also reach its maturity.A branch of the D.C. regulated power supply as power-supply system, is widely used
In the fields such as computer, communication and portable consumer electronics.
According to the difference of internal structure, regulated power supply can be divided into two major class of linear stabilized power supply and switching power supply again.
The former has many advantages, such as small stability height, output voltage ripple, low noise, transient response speed is fast and isolation is high, but efficiency
Not high (generally there was only 45%)；The latter has higher transfer efficiency, but shortcoming is of high cost, volume is big, noise is big, it is necessary to electric
Sense, capacitance, when design, also need to consider that its electromagnetism (Electromagnetic Interference, EMI) radiates.If one is
System requires power module that should have the characteristic of low noise and low ripple, reduces power consumption as much as possible again, then low pressure difference linearity
Voltage-stablizer (Low Drop-out Regulator, LDO) is undoubtedly optimal selection.
In high-speed digital circuit, thousands of logic gates is rapidly performed by switch motion, therefore will to power supply
Ask very high.It requires LDO power supplys that must have sufficiently fast response speed can adjust output voltage in time, avoids output voltage
It is too low or excessively high circuit logic is caused to get muddled.Simultaneously as the continuous improvement of chip integration and the simplification of peripheral circuit
It is required that so that the low-power consumption small area of LDO circuit is designed to hot issue.
LDO is classified according to the current control mode of power transistor, the grid of simulation LDO control power transistors
To the voltage of source electrode, and the conducting number (ON or OFF) of number LDO controlling transistors.Therefore, the power transistor of digital LDO
Gate source voltage bigger, can be substantially reduced chip area under identical supply voltage and load current conditions, have tradition
Simulate the incomparable advantage of LDO technologies.With the continuous development of Moore's Law and the continuous improvement of chip integration, core
Piece design size and external input voltage also constantly reduce, and simulate the design of LDO circuit more difficult.Meanwhile for mould
For intending LDO, the fluctuation of load current causes output pole location constantly to change, and unstability and the design for adding output are difficult
Degree.And the design of number LDO is insensitive for small signal variation, there is less load stabilization sex chromosome mosaicism.
Earliest digital LDO circuit is deposited by the bi-directional shift of a clock comparator, a serial input, parallel output
Device and switching pmos array are formed, and bidirectional shift register works as a controller, only each clock edge into
Row switch activity so greatly reduces transient response rate.And control logics of the single ADC as PMOS is only used only, energy
Enough switches for controlling multiple PMOS simultaneously, improve transient state rate, but shortcoming is that output voltage ripple is larger.Therefore, study
Go out a kind of method that can be improved transient response rate and not influence output voltage ripple simultaneously to be of great significance.
The content of the invention
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of numbers based on double loop ADC
LDO circuit, its object is to solve existing digital LDO circuit to cause transient response energy force difference since voltage regulation capability is limited
The technical issues of.
To achieve the above object, the present invention provides a kind of digital linear voltage-stablizer based on double loop analog-to-digital conversion module,
Including：
Switching tube group, including first switch pipe group and second switch pipe group, the drain electrode of first switch pipe group is opened with second
The drain electrode for closing pipe group connects and composes switching tube group output terminal, and the source electrode of first switch pipe group is connected with the source electrode of second switch pipe group
Form the input terminal of switching tube group, the first control terminal of the grid of first switch pipe group as switching tube group, second switch pipe group
Second control terminal of the grid as switching tube group；First control signal is used to that first switch Guan Zuzhong switching tubes to be controlled to turn on number
Amount, for second control signal for second switch Guan Zuzhong switching tubes to be controlled to turn on quantity, the breadth length ratio of first switch pipe group is long-range
In the breadth length ratio of second switch pipe group, realize that switching tube group stablizes electricity according to first control signal and second control signal output
Pressure；
Voltage acquisition module, input terminal are connected with the output terminal of switching tube group, for load current to be converted into feedback
Voltage；
Current acquisition module, input terminal are connected with the output terminal of switching tube group, for gathering load current；
First makes energy control module, the output terminal connection of input terminal and current acquisition module, for according to load current
Size export the first enable signal；
The second output terminal connection of first analog-to-digital conversion module, input terminal and voltage acquisition module, Enable Pin is the same as the
One connects the output terminal of energy control module, and output terminal is connected with the first control terminal of switching tube group, for making according to first
It can signal, feedback voltage and the first reference voltage output first control signal；
Second makes energy control module, and input terminal is connected with the output terminal of the first analog-to-digital conversion module, the second input terminal
It is connected with the output terminal of current acquisition module, for enabled according to first control signal variation and load current size output second
Signal；
The output terminal connection of second analog-to-digital conversion module, input terminal and voltage acquisition module, Enable Pin make with second
The output terminal connection of energy control module, output terminal are connected with the second control terminal of switching tube group, for according to the second enabled letter
Number, feedback voltage and the second reference voltage output second control signal.
Preferably, digital linear voltage-stablizer further includes band-gap reference module, the first output terminal and the first analog-to-digital conversion mould
The reference edge connection of block, second output terminal are connected with the reference edge of the second analog-to-digital conversion module, for exporting first with reference to electricity
Pressure and the second reference voltage.
Preferably, digital linear voltage-stablizer further includes：
Overheat protector module is set there are five output terminal, and the first output terminal is connected with the Enable Pin of band-gap reference module,
Its second output terminal connects the Enable Pin of energy control module with first, and the 3rd output terminal is the same as the Enable Pin of current acquisition module
Connection, for according to environment temperature output protection enable signal is detected, protection enable signal to be used to control band-gap reference module
Whether work with the second analog-to-digital conversion module, first makes energy control module according to protection enable signal and load current output first
Enabled control signal；
First protection switch pipe, control terminal are connected with the 4th output terminal of overheat protector module, and drain same switching tube
The first control terminal connection of group, for exporting the first additional control signals, the first additional control according to the enabled control signal of protection
Signal and first control signal co- controlling first switch pipe group make the stable voltage of first switch pipe group output；
Second protection switch pipe, control terminal are connected with the 5th output terminal of overheat protector module, and drain same switching tube
The second control terminal connection of group, for exporting the second additional control signals, the second additional control according to the enabled control signal of protection
Signal and second control signal co- controlling second switch pipe group make the stable voltage of second switch pipe group output.
Preferably, digital linear voltage-stablizer further includes current-limiting protection module, and input terminal connects with the output terminal of switching tube group
It connects, for protecting enable signal according to load current size output overcurrent；And
Protection makes energy control module, and first input end is connected with the output terminal of current-limiting protection module, the second input terminal
Output terminal with overheat protector module connects, for according to overcurrent protection enable signal and the excess temperature exported by overheat protector module
Protect enable signal output protection enable signal.
Preferably, voltage acquisition module includes the first resistor and second resistance of series connection, wherein, one end of first resistor is made
For the input terminal of voltage acquisition module, the output terminal of the tie point of first resistor and second resistance as voltage acquisition module,
The other end ground connection of two resistance.
Preferably, when the load current of input to current acquisition module is more than current threshold, first makes energy control module
Exporting the first enable signal makes the first analog-to-digital conversion module work, and carries out the switch motion tune of first switch Guan Zuzhong corresponding devices
Section output voltage is restored to stationary value；When the load current of input to current acquisition module is less than current threshold, so it is enabled
Control module, which exports the second enable signal, makes the second analog-to-digital conversion module work, and carries out opening for second switch Guan Zuzhong corresponding devices
Pass action adjusts output voltage and is restored to stationary value.
Preferably, when a certain position in the output terminal that feedback voltage makes the first analog-to-digital conversion module repeats to change, second
Energy control module is made, which to export the second enable signal, makes the second analog-to-digital conversion module work, the partial switch pipe of second switch pipe group
Control terminal, which changes and then adjusts output voltage, is restored to stationary value.
In general, by the above technical scheme conceived by the present invention compared with prior art, it can obtain down and show
Beneficial effect：
1st, digital linear voltage-stablizer provided by the invention, by the first analog-to-digital conversion module export first control signal, first
Control signal controls the output voltage of first switch pipe group, and second control signal, the second control are exported by the second analog-to-digital conversion module
The output voltage of signal control second switch pipe group processed；When load current is more than current threshold, the first analog-to-digital conversion module work
Make, adjust the grid voltage of the corresponding metal-oxide-semiconductor of first switch pipe group, realize the adjusting of switching tube group load capacity；Work as load current
During less than current threshold, the work of the second analog-to-digital conversion module adjusts the grid voltage of the corresponding metal-oxide-semiconductor of second switch pipe group, realizes
The adjusting of switching tube group load capacity.
2nd, digital linear voltage-stablizer provided by the invention when switching tube group load capacity is much smaller than load current size, makes
First analog-to-digital conversion module works, and significantly adjusts switching tube group load capacity, realizes the coarse adjustment of output voltage；When first switch pipe
Group adjust cannot adjusting switch pipe group load capacity again, start the second analog-to-digital conversion module, adjusting switch pipe group loads by a small margin
Ability realizes switching tube group voltage trim, improves the transient response ability of digital linear voltage-stablizer.
Description of the drawings
Fig. 1 is the structure diagram of the digital linear voltage-stablizer provided by the invention based on double loop analog-to-digital conversion module.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Conflict is not formed each other to can be combined with each other.
Fig. 1 is the structure diagram of the digital linear voltage-stablizer provided by the invention based on double loop analog-to-digital conversion module,
The digital linear voltage-stablizer, which includes first, turns energy control module, band-gap reference module, the first analog-to-digital conversion module, the second modulus
Change module, second make energy control module, overheat protector module, current-limiting protection module, voltage acquisition module, current acquisition module and
Switching tube group, wherein, switching tube group includes first switch pipe group and second switch pipe group, first switch pipe group and second switch pipe
Group is PMOS power tubes.
Voltage acquisition module is the first resistor R1 of series connection and second resistance R2, and voltage acquisition module first end ground connection is electric
Pressure acquisition module second end is connected with two groups of PMOS power tubes drain electrode VOUT, the 3rd end 1 of voltage acquisition module and the first modulus
The input terminal 3 of conversion module, the input terminal 4 of the second analog-to-digital conversion module connect so that output caused by being changed by load current
Voltage change feeds back to input terminal.The input terminal 21 of current acquisition module is connected with two groups of PMOS power tubes drain electrode VOUT, electric current
First output terminal of acquisition module is connected the first Enable Pin 2 of energy control module with first, and the second of current acquisition module is defeated
Outlet is connected with the second input terminal 20 of the second enabled module, and first makes 5 and first analog-to-digital conversion of output terminal of energy control module
The Enable Pin EN1 connections of module so that when load current is more than current threshold, i.e., the first mould when electric current is widely varied
Number conversion module is in running order.The current threshold is according to the drive of the driving force and second switch pipe group of first switch pipe group
Kinetic force determines.
The output terminal 9 of first analog-to-digital conversion module is connected the first input end 6 of energy control module with second, while with
The grid 12 of one group of PMOS power tube module connects so that the conducting of first group of PMOS tube when acute variation occurs for load current
Number is made adjustment, so as to increase or reduce the driving force of circuit.The same voltage of the second input terminal of second analog-to-digital conversion module
The output terminal connection of acquisition module, and the Enable Pin 8 of the second analog-to-digital conversion module connects the output terminal 7 of energy control module with second
It connects.The output terminal 10 of second analog-to-digital conversion module is connected with the grid 11 of second group of PMOS power tube so that the load of circuit is driven
Power can be finely adjusted, and circuit faster reaches stable state.When load current is less than current threshold, i.e., electric current changes
Amplitude it is smaller when, for load current adjustable range in second switch pipe group control range, second makes energy control module at this time
Second enable signal is exported according to load current and first control signal, the second enable signal makes the second analog-to-digital conversion module work
Make, realize the adjusting of load current.
Digital linear voltage-stablizer further includes band-gap reference module, overheat protector module, the first protection switch pipe, the second protection
Switching tube, current-limiting protection module and protection make energy control module.The first output terminal of band-gap reference module is used to turn with the first modulus
Change the reference edge connection of module, band-gap reference module second output terminal is used to be connected with the reference edge of the second analog-to-digital conversion module,
Band-gap reference module is for the first reference voltage of output and the second reference voltage.
First protection switch pipe drains with the first control terminal connection of switching tube group, and the drain electrode of the second protection switch pipe is the same as switch
The second control terminal connection of pipe group, current-limiting protection module input are connected with the output terminal of switching tube group, protect enabled control mould
Block first input end is connected with the output terminal of current-limiting protection module, and protection makes the second input terminal of energy control module with overheat protector mould
The output terminal connection of block, protection make the first output terminal of energy control module be connected with the Enable Pin of band-gap reference module, and protection is enabled
Control module second output terminal connects the Enable Pin of energy control module with first, and protection makes the 3rd output terminal of energy control module same
The Enable Pin connection of current acquisition module, protection make the 4th output terminal of energy control module connect with the grid of the first protection switch pipe
It connects, protection makes the 5th output terminal of energy control module be connected with the grid of the second protection switch pipe.
Overheat protector module is used for according to the environment temperature output protection enable signal detected, and current-limiting protection module is used for
Enable signal is protected according to load current output overcurrent；Protection make energy control module for according to overcurrent protection enable signal and by
The overheat protector enable signal output protection enable signal of overheat protector module output.Protection enable signal is used to control band gap base
Whether quasi-mode block and the second analog-to-digital conversion module work, and first makes energy control module for being adopted according to protection enable signal and electric current
Collect the first enabled control signal of feedback current output of module output.First protection switch pipe is used for according to the enabled control letter of protection
Number the first additional control signals of output, the first additional control signals and first control signal co- controlling first switch pipe group make the
The stable voltage of one switching tube group output；Second protection switch pipe is used for according to enabled the second additional control of control signal output of protection
Signal processed, the second additional control signals and second control signal co- controlling second switch pipe group make the output of second switch pipe group steady
Fixed voltage.
In embodiment provided by the invention, protection makes energy control module for NAND gate, when environment temperature is excessively high, excess temperature
Protect circuit output high level or when load current is excessive, current-limiting protection circuit output high level.At this point, by or it is non-
Low level signal is exported behind the door, closes band-gap reference module, and first makes energy control module be exported according to the low level signal of input
First enable signal makes the first analog-to-digital conversion module not work, and low level signal and the second enable signal control the second modulus to turn
Change module, output low level signal to the second analog-to-digital conversion module makes the second analog-to-digital conversion module not work, while the first protection
The drain voltage of the drain voltage of switching tube and the second protection switch pipe causes the grid voltage of two groups of PMOS tube to reach power supply electricity
Pressure, PMOS are off state, close the output of entire circuit.
First switch pipe group includes the N number of PMOS power tubes being connected in parallel, the grid and the first modulus of N number of PMOS power tubes
The output of conversion module connects one to one；The source electrode of N number of PMOS power tubes is connected with power supply；The drain electrode of N number of PMOS power tubes
It is connected with the input terminal of voltage acquisition module, while as the output terminal of entire circuit.First switch pipe group includes being connected in parallel
M PMOS tube, the grid of M PMOS tube and the output terminal of the second analog-to-digital conversion module connect one to one；M PMOS tube
Source electrode is connected with power supply；The drain electrode of M PMOS tube and the input terminal of voltage acquisition module connect.
Voltage acquisition module is used for after output voltage is divided compared with reference voltage.First resistor resistance value and second
Resistance is defeated according to the first reference voltage level of the output of band-gap reference module and the second reference voltage level and switching tube group
Go out voltage to determine, the numerical value of an output voltage VREF2 of band-gap reference module is equal to another output numerical value VREF1；Second
The size of group PMOS tube is long much smaller than first group of PMOS tube much smaller than first group of PMOS tube size, the i.e. length-width ratio of the second PMOS tube
Wide ratio, in embodiments of the present invention, first group of PMOS power tube can drive larger load current；Second group of PMOS power tube can
The load current of very little is driven, convenient for load current being adjusted control.
Digital linear voltage-stablizer operation principle provided in an embodiment of the present invention based on double loop analog-to-digital conversion module is as follows：
The output terminal of first analog-to-digital conversion module and the second analog-to-digital conversion module is respectively used to two groups of PMOS power tubes of control
Turn-on and turn-off.It is corresponding with the output terminal of the analog-to-digital conversion module when the thermometer code value of analog-to-digital conversion module output is 0
The PMOS power tubes of connection are opened, similarly, when the thermometer code value of analog-to-digital conversion module output is 1, corresponding PMOS work(
Rate pipe turns off.In embodiments of the present invention, the breadth length ratio of first group of PMOS power tube is larger, and each PMOS tube can drive larger
Load current；The breadth length ratio of second group of PMOS power tube is smaller, and each PMOS tube can drive the load current of very little.
When load current is in the range of second group of PMOS power tube can drive, first exports energy control module
Enable signal EN1 is low level, and the thermometer code value of control the first analog-to-digital conversion module output is 1, in work inhibited mode
Formula.The amplitude size of load current fluctuations can influence the instantaneous value of output voltage, that is, be now in the drive of the PMOS of conducting state
Kinetic force deficiency is superfluous.When load current variation is small, output voltage ripple is accordingly smaller.If second group of PMOS power tube energy
Enough drive the load current of 20mA, when load current in 2mA to when being toggled between 4mA, only the second analog-to-digital conversion module work
Make, due to the variation by a small margin of output voltage so that the corresponding thermometer-code of the second analog-to-digital conversion module changes, control pair
The switch for the PMOS tube answered adjusts the load capacity of PMOS tube.When load current increases, output voltage decreases, anti-
Feedthrough voltage is with base pressure more afterwards so that the number of the second analog-to-digital conversion module output temperature meter code value 0 increases so that corresponding
PMOS tube becomes conducting state from closing, and can drive the load current of bigger.Correspondingly, 2mA is become from 4mA in load current
When, the feedback terminal voltage of output voltage and base pressure relatively after so that the thermometer code value 0 of the second analog-to-digital conversion module output
Number is reduced so that corresponding PMOS tube is become by conducting to be in off state, and corresponding circuital current driving force is declined.
Be more than the scope that second group of PMOS tube can carry when load current changes greatly, for example, load current by
10mA becomes 45mA, and output voltage significantly reduces, when load current, which is more than current threshold output voltage, is less than voltage threshold,
First makes energy control module output enable signal EN1 be high level at this time, and the first analog-to-digital conversion module of control is in normal work
Pattern, while make energy control module output reset signal reset via second so that the second analog-to-digital conversion module, which is in, resets shape
State, second group of PMOS tube are in closed state.The voltage threshold is determined according to switching tube group output voltage adjustable range.Output
Voltage feedback value causes the number of the thermometer code value 0 of the first analog-to-digital conversion module output to increase more afterwards with reference voltage, controls
It is in the conduction state to make corresponding first group of PMOS tube.When a certain position production in the thermometer-code of the first analog-to-digital conversion module output
When life changes repeatedly, illustrate that output has tended towards stability at this time, by second energy control module is made to detect the state, by the second mould
The reset signal of number conversion module is closed, its normal work is made to carry out the accurate adjustment of load driving force.When load current is by 45mA
When becoming 10mA, output voltage accordingly significantly increases, and first makes energy control module output enable signal EN1 be low electricity at this time
It is flat so that the thermometer code value of the first analog-to-digital conversion module is 1, closes first group of PMOS power tube, only relies on second group
PMOS power tubes carry out the adjusting of load driving force, until circuit output reaches stable state.
Digital LDO circuit provided in an embodiment of the present invention based on two-way ADC, circuit topological structure is convenient and reliable, general
Property is strong, improves the problem of conventional digital LDO circuit transient response is slower.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of digital linear voltage-stablizer based on double loop analog-to-digital conversion module, which is characterized in that including：
Switching tube group, including first switch pipe group and second switch pipe group, the drain electrode of first switch pipe group is the same as second switch pipe
The drain electrode of group connects and composes switching tube group output terminal, and the source electrode of first switch pipe group is connected and composed with the source electrode of second switch pipe group
The input terminal of switching tube group, the first control terminal of the grid of first switch pipe group as switching tube group, the grid of second switch pipe group
Second control terminal of the pole as switching tube group；First control signal is used to that first switch Guan Zuzhong switching tubes to be controlled to turn on quantity,
Second control signal is for controlling second switch Guan Zuzhong switching tubes to turn on quantity, and the breadth length ratio of first switch pipe group is much larger than the
The breadth length ratio of two switching tube groups realizes that switching tube group exports burning voltage according to first control signal and second control signal；
Voltage acquisition module, input terminal are connected with the output terminal of switching tube group, for load current to be converted into feedback voltage；
Current acquisition module, input terminal are connected with the output terminal of switching tube group, for gathering load current；
First makes energy control module, the output terminal connection of input terminal and current acquisition module, for according to the big of load current
The first enable signal of small output；
The second output terminal connection of first analog-to-digital conversion module, input terminal and voltage acquisition module, Enable Pin make with first
The output terminal connection of energy control module, output terminal are connected with the first control terminal of switching tube group, for according to the first enabled letter
Number, feedback voltage and the first reference voltage output first control signal；
Second makes energy control module, and input terminal is connected with the output terminal of the first analog-to-digital conversion module, the second input terminal and electricity
The output terminal connection of acquisition module is flowed, for according to the second enabled letter of first control signal variation and the output of load current size
Number；
The output terminal connection of second analog-to-digital conversion module, input terminal and voltage acquisition module, Enable Pin is the same as the second enabled control
The output terminal connection of molding block, output terminal is connected with the second control terminal of switching tube group, for according to the second enable signal, instead
Feedthrough voltage and the second reference voltage output second control signal.
2. digital linear voltage-stablizer as described in claim 1, which is characterized in that digital linear voltage-stablizer further includes band-gap reference
Module, the first output terminal are connected with the reference edge of the first analog-to-digital conversion module, second output terminal and the second analog-to-digital conversion mould
The reference edge connection of block, for exporting the first reference voltage and the second reference voltage.
3. digital linear voltage-stablizer as claimed in claim 2, which is characterized in that digital linear voltage-stablizer further includes：
Overheat protector module is set there are five output terminal, and the first output terminal is connected with the Enable Pin of band-gap reference module, the
Two output terminals connect the Enable Pin of energy control module with first, and the 3rd output terminal connects with the Enable Pin of current acquisition module
Connect, for according to detecting environment temperature output protection enable signal, protection enable signal for control band-gap reference module and
Whether the second analog-to-digital conversion module works, and first makes energy control module be made according to protection enable signal and load current output first
It can control signal；
First protection switch pipe, control terminal are connected with the 4th output terminal of overheat protector module, are drained with switching tube group
First control terminal connects, for exporting the first additional control signals, the first additional control signals according to the enabled control signal of protection
Make the stable voltage of first switch pipe group output with first control signal co- controlling first switch pipe group；
Second protection switch pipe, control terminal are connected with the 5th output terminal of overheat protector module, are drained with switching tube group
Second control terminal connects, for exporting the second additional control signals, the second additional control signals according to the enabled control signal of protection
Make the stable voltage of second switch pipe group output with second control signal co- controlling second switch pipe group.
4. digital linear voltage-stablizer as claimed in claim 3, which is characterized in that digital linear voltage-stablizer further includes current-limiting protection
Module, input terminal are connected with the output terminal of switching tube group, for protecting enable signal according to load current size output overcurrent；
And
Protection makes energy control module, and first input end is connected with the output terminal of current-limiting protection module, the same mistake of the second input terminal
The output terminal connection of warm protection module, for according to overcurrent protection enable signal and the overheat protector exported by overheat protector module
Enable signal output protection enable signal.
5. such as Claims 1-4 any one of them digital linear voltage-stablizer, which is characterized in that voltage acquisition module includes string
The first resistor and second resistance of connection, wherein, the input terminal of one end of first resistor as voltage acquisition module, first resistor and
Output terminal of the tie point of second resistance as voltage acquisition module, the other end ground connection of second resistance.
6. such as digital linear voltage-stablizer described in any one of claim 1 to 5, which is characterized in that when input to current acquisition mould
When the load current of block is more than current threshold, first, which makes energy control module export the first enable signal, makes the first analog-to-digital conversion module
Work, the switch motion adjusting output voltage for carrying out first switch Guan Zuzhong corresponding devices are restored to stationary value；When input to electricity
When flowing the load current of acquisition module less than current threshold, and then the second enable signal of energy control module output is made to make the second modulus
Conversion module works, and the switch motion adjusting output voltage for carrying out second switch Guan Zuzhong corresponding devices is restored to stationary value.
7. such as claim 1 to 6 any one of them digital linear voltage-stablizer, which is characterized in that when feedback voltage makes the first mould
When a certain position in the output terminal of number conversion module repeats to change, second, which makes energy control module export the second enable signal, makes second
Analog-to-digital conversion module works, and the control terminal of the partial switch pipe of second switch pipe group, which changes and then adjusts output voltage, to be restored to surely
Definite value.
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