CN107102666A - Low pressure difference linear voltage regulator - Google Patents
Low pressure difference linear voltage regulator Download PDFInfo
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- CN107102666A CN107102666A CN201610096692.3A CN201610096692A CN107102666A CN 107102666 A CN107102666 A CN 107102666A CN 201610096692 A CN201610096692 A CN 201610096692A CN 107102666 A CN107102666 A CN 107102666A
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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
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- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention discloses a kind of low pressure difference linear voltage regulator, including：Bleeder circuit, for producing feedback voltage according to the output voltage of low pressure difference linear voltage regulator；Error amplifier, first voltage is exported for feedback voltage to be compared with reference voltage, and according to comparative result from the output end of error amplifier；Output transistor, including the first end of the output end of error amplifier is coupled to, and be coupled to bleeder circuit and export the second end of output voltage；Differential circuit, receives feedback voltage and reference voltage, and second voltage is generated in its output；And first capacitor, it is coupled between the output end of differential circuit and the first end of output transistor, wherein, by the first capacitor, first voltage follows second voltage synchronously change.The low pressure difference linear voltage regulator that the present invention is provided has faster response speed, can quickly suppress the change of the output voltage of low pressure difference linear voltage regulator, with keep low pressure difference linear voltage regulator output voltage it is steady.
Description
Technical field
The present invention relates to technical field of power management, more particularly to a kind of low pressure difference linear voltage regulator
(Low Dropout Regulator,LDO)。
Background technology
Low pressure difference linear voltage regulator has low cost, output voltage stabilization, output ripple and low, low noise
Sound and the advantages of without electromagnetic interference, therefore it is widely used in communication equipment, automobile electronics
In medical instruments and equipment.
Fig. 1 is the schematic diagram of traditional low dropout linear regulator structure.As shown in figure 1, traditional
Low pressure difference linear voltage regulator include error amplifier EA1, bleeder circuit, output transistor T.
System is by bleeder circuit (including resistance R2 and R3) to output voltage VO' carry out partial pressure sampling
Generate feedback voltage VFB.An error amplifier EA1 input receives the feedback voltage VFB,
Another input receives reference voltage VREF, error amplifier EA1 output end connection output crystal
Pipe T grid.Error amplifier EA1 is by feedback voltage VFBWith reference voltage VREFAfter being compared,
Outputting drive voltage V after its difference is amplifiedG' driving output transistor T.
When causing output voltage V due to loading condition or other conditionsO' when changing, error is put
Big device EA1 output voltage can also change therewith, and then control output transistor T conducting degree,
So that output voltage VO' keep constant.
However, when external condition change causes output voltage VO' change when, to the response of change speed
Degree is the important indicator for investigating low pressure difference linear voltage regulator performance.For example, occurring in load current anxious
During drastic change, output voltage VO' also can drastically change, this change is fed back to by divider resistance
Error amplifier EA1 input, and error amplifier EA1 response needs the regular hour,
Prevent output transistor T grid influences defeated from the drastically change of response output voltage quickly
Go out the stability of voltage and the response characteristic of low pressure difference linear voltage regulator.
The content of the invention
In view of this, the present invention provides a kind of low pressure difference linear voltage regulator, with faster response speed
Degree, can quickly suppress the change of the output voltage of low pressure difference linear voltage regulator.
Based on embodiments of the present invention, the present invention provides a kind of low pressure difference linear voltage regulator, including：
Bleeder circuit, for producing feedback voltage according to the output voltage of the low pressure difference linear voltage regulator；
Error amplifier, for the feedback voltage and reference voltage to be compared, and according to comparing knot
Fruit exports first voltage from the output end of the error amplifier；Output transistor, including be coupled to
The first end of the output end of the error amplifier, and be coupled to the bleeder circuit and export institute
State the second end of output voltage；Differential circuit, receives the feedback voltage and the reference voltage,
Second voltage is generated in its output；And first capacitor, it is coupled to the differential circuit
Between output end and the first end of the output transistor, wherein, should by first capacitor
First voltage follows the second voltage synchronously change.
Based on embodiments of the present invention, the present invention also provides a kind of low pressure difference linear voltage regulator, its
It is characterised by, including bleeder circuit, the first negative feedback loop, the second negative feedback loop and output
Transistor, wherein, the bleeder circuit, for the output according to the low pressure difference linear voltage regulator
Voltage produces feedback voltage；First negative feedback loop, comprising error amplifier, receives described
Feedback voltage and reference voltage, and the feedback voltage and the reference voltage are compared, it is raw
Into first voltage；Second negative feedback loop, including differential circuit and the first capacitor, institute
State differential circuit and receive the feedback voltage and the reference voltage, generate second voltage, described the
One capacitor be coupled to the output end of the differential circuit and the output transistor first end it
Between；And the output transistor, the output end of its first end coupling error amplifier and institute
The first capacitor is stated, its second end couples institute as the output end of the low pressure difference linear voltage regulator
Bleeder circuit is stated, wherein, by first capacitor, the first voltage follows described second
Voltage synchronous changes.
The low pressure difference linear voltage regulator that the present invention is provided has faster response speed, can quickly press down
The change of the output voltage of low pressure difference linear voltage regulator processed, to keep the defeated of low pressure difference linear voltage regulator
Go out the steady of voltage.
Brief description of the drawings
Fig. 1 is the schematic diagram of the low dropout linear regulator structure for prior art；
Fig. 2 is the structural representation of the low pressure difference linear voltage regulator in an embodiment of the present invention；
Fig. 3 be output transistor output current change over time, low pressure difference linearity in the prior art
The output voltage of voltage-stablizer and the voltage of driving output transistor are changed over time, low voltage difference of the present invention
Output voltage and driving output when differential circuit is connected with output transistor in linear voltage regulator is brilliant
The schematic diagram that the voltage of body pipe is changed over time.
Embodiment
The invention discloses a kind of low pressure difference linear voltage regulator, as shown in Fig. 2 Fig. 2 is the present invention
The structural representation of low pressure difference linear voltage regulator in one embodiment.The low pressure difference linear voltage regulator
Including bleeder circuit 10, error amplifier EA1, output transistor T, differential circuit 11 and electricity
Container C2.
Bleeder circuit 10 is according to the output voltage V of low pressure difference linear voltage regulatorOProduce feedback voltage
VFB.Specifically, bleeder circuit 10 includes second resistance device R2 and 3rd resistor device R3, second
Resistor R2 first end is connected with output transistor T the second end, and the of second resistance device R2
Two ends are connected with 3rd resistor device R3 first end, 3rd resistor device R3 the second end ground connection
GND.In the present embodiment, by second resistance device R2 the second end and 3rd resistor device R3
First end exports feedback voltage VFB, i.e. feedback voltage V is used as using 3rd resistor device R3 voltageFB。
Set it should be understood that second resistance device R2 and 3rd resistor device R3 resistance value are specific according to actual needs
Put.
Error amplifier EA1 is used for feedback voltage VFBWith reference voltage VREFIt is compared, and root
According to comparative result first voltage V1 is exported from error amplifier EA1 output end.Wherein, error
Amplifier EA1 normal phase input end receives reference voltage VREF, error amplifier EA1's is anti-phase defeated
Enter end to be coupled between second resistance device R2 the second end and 3rd resistor device R3 first end, with
Receive feedback voltage VFB.Specifically, error amplifier EA1 compares feedback voltage VFBWith reference electricity
Press VREF, and first voltage V1 will be exported after the difference amplification of the two, for driving output transistor
T。
Output transistor T first end is connected with error amplifier EA1 output end, exports crystal
Pipe T the second end coupling bleeder circuit 10 simultaneously exports output voltage VO, i.e. output transistor T
The second end be used as the output end of low pressure difference linear voltage regulator, output transistor T the 3rd end conduct
The input of low pressure difference linear voltage regulator, receives input voltage vin.
In the present embodiment, output transistor T can be N-type metal-oxide-semiconductor, output transistor T
First end be N-type metal-oxide-semiconductor grid, output transistor T the second end is N-type MOS
The source electrode of pipe, output transistor T the 3rd end is the drain electrode of N-type metal-oxide-semiconductor.
It should be understood that in other embodiments, output transistor T can be NPN type triode,
Output transistor T first end is the base stage of NPN type triode, the second of output transistor T
The emitter stage for NPN type triode is held, output transistor T the 3rd end is NPN type triode
Colelctor electrode.
In some embodiments, in the low pressure difference linear voltage regulator shown in Fig. 2, it can also include
Buffer BF, is coupled to error amplifier EA1 output end and output transistor T first end
Between.Wherein, buffer BF is positive buffer.
Differential circuit 11 is connected with bleeder circuit 10, receives feedback voltage VFBWith reference voltage VREF,
And second voltage V2 is exported by output end.Wherein, differential circuit 11 includes error amplifier
EA2, capacitor C1 and resistor R1.Error amplifier EA2 positive input receives reference
Voltage VREF, error amplifier EA2 reverse input end coupling capacitor C1 the second end, by mistake
Poor amplifier EA2 output end as differential circuit 11 output end, the first of capacitor C1
The input as differential circuit is held, for receiving feedback voltage VFB, resistor R1 is coupled in mistake
Between poor amplifier EA2 reverse input end and output end.
Capacitor C2 first end couples the output end of differential circuit 11, and the coupling output of the second end is brilliant
Body pipe T first end.According to the characteristic of capacitor, the second of the output end of differential circuit 11
When voltage V2 changes, capacitor C2 enable to the voltage of output transistor T first end with
Synchronously change with second voltage V2, to control output transistor T conducting degree.Specifically,
In normal operation, i.e. feedback voltage VFBKeep constant, itself and reference voltage VREFIt is identical,
Capacitor C2 the first terminal voltage value and capacitor C2 the second terminal voltage value are equal, do not have now
Electric current flows in or out output transistor T first end, brilliant with output equivalent to differential circuit 11
Body pipe T is disconnected.When working condition changes, i.e. when output voltage Vo changes, feedback
Voltage VFBAlso change so that the second voltage V2 changes that the output end of differential circuit 11 is exported,
The magnitude of voltage and the magnitude of voltage at capacitor C2 the second end of capacitor C2 first end can now be caused
It is unequal, thus have the output end of electric current from differential circuit 11 flows to output transistor T
One end has electric current to be flowed out from output transistor T first end, so as to control output transistor T
Conducting degree, and then change output voltage Vo, suppress output voltage Vo change.
In addition, in some embodiments, can also have in the output end of low pressure difference linear voltage regulator
There are capacitor C3, capacitor C3 one end connection output transistor T the second end, another termination
Ground GND.Capacitor C3 is that important electric charge stores and provided device, can be effectively reduced due to negative
Carry electric current when drastically changing output voltage fall and overshoot.
Figure it is seen that error amplifier EA1, output transistor T and bleeder circuit 10
Constitute the first backfeed loop, differential circuit 11, capacitor C2, output transistor T and partial pressure electricity
Road 10 is constituted and the parallel second feed back loop of the first backfeed loop.What second feed back loop was received
Input signal is identical with the first backfeed loop, receives feedback voltage VFBWith reference voltage VREF。
Specifically, in the present embodiment, feedback voltage VFBWith output voltage VOIt is linear scale
Relation, shown in formula specific as follows：
VFB=VO*R3/(R2+R3) (1)
Relation between output voltage and its input voltage that differential circuit 11 is exported is specific as follows
Shown in formula：
Wherein, the v in above-mentioned formulai(t) input voltage of differential circuit is represented, in this embodiment
In, i.e. VFB。vo(t) voltage of the output end of differential circuit, in this embodiment, i.e., the are represented
Two voltage V2.R is resistor R1 resistance value, and C is capacitor C1 capacitance.
Learn that the output voltage of differential circuit 11 is at it based on upper described formula (1), (2)
Change immediately when input voltage changes, i.e. the output voltage of differential circuit 11 is inputted to it
The change of voltage is very sensitive.
Therefore, compared with error amplifier, differential circuit can reflect input voltage faster
Mutational part.Thus, compared with the first backfeed loop comprising error amplifier circuit, comprising micro-
The second feed back loop of parallel circuit, can be than the first backfeed loop more quick response output voltage
VOChange.
For the embodiment shown in Fig. 2, not yet start to suppress output voltage in the first backfeed loop
VOChange when, the second feed back loop comprising differential circuit is to feedback voltage VFBChange enter
Response is gone, so that suppression output voltage V more faster than the first backfeed loopOChange, it is more fast
Output voltage V is maintained fastlyOStabilization.
The operation principle of the low pressure difference linear voltage regulator is illustrated with reference to Fig. 2 and Fig. 3.
Fig. 3 changes over time for output transistor T output current Io, low voltage difference in the prior art
The output voltage V of linear voltage regulatorO' and driving output transistor T driving voltage VG' with the time
Change, and differential circuit 11 and output transistor T connects in low pressure difference linear voltage regulator of the present invention
Output voltage V when connecingOWith driving output transistor T driving voltage VGThe signal changed over time
Figure.
Specifically, when before time t 1, output voltage VODuring in stable state, error is put
The feedback voltage V that big device EA1 two inputs are received respectivelyFBWith reference voltage VREFIt is equal, this
When, its first voltage V1 exported is one depending on load current (i.e. output current) Io
Fixed value Vinitial.In the case where the load that the low pressure difference linear voltage regulator is connected is determined, the electricity
Press VinitialFor determination value.In output voltage VOWhen changing, error amplifier EA1 outputs
First voltage V1 be its fixed voltage VinitialPlus its variation delta V1, the of capacitor C2
The magnitude of voltage at two ends is first voltage V1.Likewise, output voltage VODuring in stable state,
The feedback voltage V that differential circuit 11 is receivedFBWith reference voltage VREFIt is equal, the second of its output end
Voltage V2 and feedback voltage VFBWith reference voltage VREFIt is equal, the voltage of capacitor C2 first end
It is worth for second voltage V2.Now capacitor C2 two ends are in stable state.That is, when defeated
Go out voltage VODuring in stable state, between second feed back loop and output transistor T equivalent to
It is off, i.e. in normal work, differential circuit 11 and low pressure difference linear voltage regulator
Output voltage VOIt is isolation.
When since time t1, output transistor T output current Io is gradually reduced, output is electric
Press VOWhen being begun to ramp up by stable state, feedback voltage VFBAlso proportionally rise.Due to differential
Error amplifier EA2 reverse input end receives feedback voltage V in circuit 11FB, therefore differential electricity
The second voltage V2 that road 11 is exported declines rapidly, and the magnitude of voltage of capacitor C2 first end is synchronous
Ground declines rapidly with second voltage V2.Due to the first backfeed loop response output voltage VOChange
There is delay relative to second feed back loop so that the magnitude of voltage at capacitor C2 the second end is temporary transient
Synchronously change without the magnitude of voltage with capacitor C2 first end, and now the first of capacitor C2
The magnitude of voltage at end there occurs rapid decline, due to the continuity of capacitor voltage at both ends, in capacitor
When the voltage of C2 first ends declines rapidly, the voltage at the ends of capacitor C2 second can be caused also to followed by
Decline.Therefore, compared with the first backfeed loop not comprising differential circuit 11, present embodiment
The driving voltage V of middle output transistor T first endGDecline that can be earlier, thus can be earlier
Ground controlling transistor T conducting degree.Due to the effect of differential circuit 11, second voltage V2 is fast
The time that speed declines can export the time of first voltage V1 changes earlier than error amplifier EA1, from
And output voltage V is limited rapidlyOIt is further up.
In the first backfeed loop, work as feedback voltage VFBWhen proportionally rising, due to feedback voltage
VFBIt is connected with error amplifier EA1 reverse input end, error amplifier EA1 output electricity
V1 is pressed to decline.First backfeed loop and second feed back loop comprising differential circuit 11 are parallel, altogether
Same-action is in output transistor T.Thus, in the first electricity of the first backfeed loop in present embodiment
Under the collective effect for pressing the second voltage V2 in V1 and second feed back loop, and in the prior art only
There is the first backfeed loop to compare, output transistor T driving voltage V in present embodimentGDecline
Degree enhancing.As shown in figure 3, during time t1 to t2, with exporting brilliant in the prior art
Body pipe T driving voltage VG' change with time and compare, output transistor T in present embodiment
Driving voltage VGThe slope changed over time is bigger.
Therefore, it is common in the first backfeed loop and second feed back loop during time t1 to t2
Under effect, output transistor T driving voltage V in present embodimentGThan exporting in the prior art
Transistor T driving voltage VG' decline degree enhancing, thus, can be brighter in present embodiment
The aobvious rising for suppressing output voltage Vo.As shown in figure 3, with prior art output voltage VO’
Change over time and compare, in present embodiment, output voltage Vo climbing speed becomes more to delay
Slowly, i.e. the change of Vo receives stronger suppression.
To time t2, output voltage Vo value rising reaches to be started to return to stable state after maximum
Fall, from figure 3, it can be seen that during time t2 to time t3, in the first backfeed loop and
Under two backfeed loop collective effects, the output voltage Vo ratios in present embodiment are defeated in the prior art
Go out voltage Vo ', declined with faster speed and the state that tends towards stability.
When since time t4, output transistor T output current Io is gradually increasing, output is electric
Press VOWhen being begun to decline by stable state, feedback voltage VFBAlso proportionally decline.Due to differential
Error amplifier EA2 reverse input end receives feedback voltage V in circuit 11FB, therefore differential electricity
The second voltage V2 that road 11 is exported rises rapidly, and the magnitude of voltage of capacitor C2 first end is synchronous
Ground rises rapidly with second voltage V2.Due to the first backfeed loop response output voltage VOChange
There is slow property relative to second feed back loop so that the magnitude of voltage at capacitor C2 the second end is temporary transient
Synchronously change without the magnitude of voltage with capacitor C2 first end, and now the first of capacitor C2
The magnitude of voltage at end there occurs rapid rising, due to the continuity of capacitor voltage at both ends, in capacitor
During the rapid rising of C2 first ends, the voltage at the ends of capacitor C2 second can be caused to also begin on gradually
Rise.Therefore, because the continuity of capacitor voltage at both ends, in the rapid of capacitor C2 first ends
During rising, the voltage at the ends of capacitor C2 second can be caused also to followed by rising.Therefore, with not wrapping
The first backfeed loop containing differential circuit 11 is compared, the of output transistor T in present embodiment
The driving voltage V of one endGRising that can be earlier, thus controlling transistor T can lead earlier
Logical degree.Due to driving voltage VGOutput transistor T conducting degree is controlled, thus, from
Time, t4 started, driving voltage VGRise and cause the output end for flowing to output transistor T rapidly
Electric current increase sharply, so as to draw high the output voltage V tapered into upwardsO, so as to limit
Output voltage VOFurther decline.
In the first backfeed loop, output voltage VOFirst voltage V1 rises during decline.First is anti-
It is fed back to road and second feed back loop comprising differential circuit 11 is parallel, collective effect is in output crystal
Pipe T.Thus, fed back in present embodiment in the first voltage V1 of the first backfeed loop and second
Under the collective effect of second voltage V2 in loop, with there was only the first backfeed loop in the prior art
Compare, output transistor T driving voltage V in present embodimentGIt is a greater degree of to rise.Such as
Shown in Fig. 3, during time t4 to t5, the driving electricity with output transistor T in the prior art
Press VG' change with time and compare, output transistor T driving voltage V in present embodimentG
The slope changed over time is bigger.
Therefore, it is common in the first backfeed loop and second feed back loop during time t4 to t5
Under effect, output transistor T driving voltage V in present embodimentGThan exporting in the prior art
Transistor T driving voltage VG' a greater degree of rising, thus, can be brighter in present embodiment
The aobvious decline for suppressing output voltage Vo.As shown in figure 3, showing with only the first backfeed loop
There is output voltage V in technologyO' change compare, in present embodiment, output voltage VOLower reduction of speed
Rate becomes more slow, i.e. the change of Vo receives stronger suppression.
To time t5, output voltage Vo value, which drops to after minimum, to be started to go up to stable state,
From figure 3, it can be seen that during time t5 to time t6, it is anti-in the first backfeed loop and second
It is fed back under the collective effect of road, the output voltage V in present embodimentOThan exporting electricity in the prior art
Vo ' is pressed, is gone up with faster speed and the state value that tends towards stability.Thus, in present embodiment,
Output voltage Vo can be quickly restored to stable state, greatly reduce the response time of circuit.
, can be faster to output by the second feed back loop formation negative-feedback comprising differential circuit
The change of voltage is responded, the change of the quick output voltage for suppressing low pressure difference linear voltage regulator,
Can effectively keep low pressure difference linear voltage regulator output voltage it is steady.And in stable state
Under, second feed back loop disconnects the connection with output transistor, and differential circuit is separated by with output circuit
From, it is to avoid interference to output voltage.
Embodiments of the invention are these are only, are not intended to limit the scope of the invention, it is every
The equivalent structure or equivalent flow conversion made using description of the invention and accompanying drawing content, or directly
Or other related technical fields are used in indirectly, similarly it is included in the patent protection model of the present invention
In enclosing.
Claims (10)
1. a kind of low pressure difference linear voltage regulator, it is characterised in that including：
Bleeder circuit, for producing feedback electricity according to the output voltage of the low pressure difference linear voltage regulator
Pressure；
Error amplifier, for the feedback voltage and reference voltage to be compared, and according to than
Compared with result first voltage is exported from the output end of the error amplifier；
Output transistor, including the first end of the output end of the error amplifier is coupled to, and
It is coupled to the bleeder circuit and exports the second end of the output voltage；
Differential circuit, receives the feedback voltage and the reference voltage, in the generation of its output
Second voltage；And
First capacitor, is coupled to the of the output end of the differential circuit and the output transistor
Between one end, wherein, by first capacitor, the first voltage follows the second voltage synchronous
Change.
2. low pressure difference linear voltage regulator according to claim 1, it is characterised in that described micro-
Parallel circuit includes：
Amplifier, with first input end, the second input and output end, the of the amplifier
One input receives the reference voltage, and the output end of the amplifier is used as the differential circuit
Output end；
Second capacitor, be coupled in the feedback voltage and the amplifier the second input it
Between；And
Resistor, be coupled in the amplifier the second input and the amplifier output end it
Between.
3. low pressure difference linear voltage regulator according to claim 2, it is characterised in that described micro-
The amplifier in parallel circuit is error amplifier, and the first input end of the amplifier is described
The normal phase input end of error amplifier, the second input of the amplifier is the error amplifier
Inverting input.
4. low pressure difference linear voltage regulator according to claim 1, it is characterised in that described low
Pressure difference linear voltage regulator also includes buffer, and the buffer is coupled to the defeated of the error amplifier
Go out between end and the first end of the output transistor, and the after being buffered by the buffer
Second voltage described in one voltage follow synchronously changes.
5. low pressure difference linear voltage regulator according to claim 1, it is characterised in that described point
Volt circuit include second resistance device and 3rd resistor device, the first end of the second resistance device with it is described
The second end connection of output transistor, the second end of the second resistance device and the 3rd resistor device
First end connection, the second end ground connection of the 3rd resistor device, by the of the second resistance device
The first end of two ends and the 3rd resistor device exports the feedback voltage.
6. low pressure difference linear voltage regulator according to claim 5, it is characterised in that the mistake
The normal phase input end of poor amplifier receives the reference voltage, the anti-phase input of the error amplifier
End is coupled between the first end of the second end of the second resistance device and the 3rd resistor device.
7. low pressure difference linear voltage regulator according to claim 1, it is characterised in that described defeated
Go out transistor for N-type metal-oxide-semiconductor, the first end of the output transistor is the N-type MOS
The grid of pipe, the second end of the output transistor is the source electrode of the N-type metal-oxide-semiconductor, described
3rd end of output transistor is the drain electrode of the N-type metal-oxide-semiconductor.
8. low pressure difference linear voltage regulator according to claim 1, it is characterised in that described defeated
Go out transistor for NPN type triode, the first end of the output transistor is the NPN type three
The base stage of pole pipe, the second end of the output transistor is the emitter stage of the NPN type triode,
3rd end of the output transistor is the colelctor electrode of the NPN type triode.
9. a kind of low pressure difference linear voltage regulator, it is characterised in that including bleeder circuit, first negative anti-
Road, the second negative feedback loop and output transistor are fed back to, wherein,
The bleeder circuit, it is anti-for being produced according to the output voltage of the low pressure difference linear voltage regulator
Feedthrough voltage；
First negative feedback loop, comprising error amplifier, receives the feedback voltage and reference
Voltage, and the feedback voltage and the reference voltage are compared, generate first voltage；
Second negative feedback loop, including differential circuit and the first capacitor, the differential electricity
Road receives the feedback voltage and the reference voltage, generates second voltage, first capacitor
Between the first end for being coupled to the output end of the differential circuit and the output transistor；And
The output transistor, its first end couples the output end and described the of the error amplifier
One capacitor, its second end is used as the output end of the low pressure difference linear voltage regulator, described point of coupling
Volt circuit, wherein, by first capacitor, the first voltage follows the second voltage
Synchronous change.
10. low pressure difference linear voltage regulator according to claim 9, it is characterised in that described
Differential circuit includes：
Amplifier, with first input end, the second input and output end, the of the amplifier
One input receives the reference voltage, and the output end of the amplifier is used as the differential circuit
Output end；
Second capacitor, its first end receives the feedback voltage, and its second end couples the amplification
Second input of device；And
The output end of resistor, its second input for being coupled in the amplifier and the amplifier
Between.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610096692.3A CN107102666A (en) | 2016-02-22 | 2016-02-22 | Low pressure difference linear voltage regulator |
| US15/435,430 US20170242449A1 (en) | 2016-02-22 | 2017-02-17 | Low-dropout linear regulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610096692.3A CN107102666A (en) | 2016-02-22 | 2016-02-22 | Low pressure difference linear voltage regulator |
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| CN109002077A (en) * | 2018-08-17 | 2018-12-14 | 电子科技大学 | A kind of transient state enhancing circuit |
| CN110022062A (en) * | 2018-01-09 | 2019-07-16 | 三星电子株式会社 | The method of adjuster and operation adjuster |
| CN110868069A (en) * | 2019-12-13 | 2020-03-06 | 北京集创北方科技股份有限公司 | Voltage adjusting device, chip and electronic equipment |
| CN112148053A (en) * | 2019-06-28 | 2020-12-29 | 台湾积体电路制造股份有限公司 | Circuit and method for generating reference voltage and reference voltage generator |
| CN112684841A (en) * | 2019-10-18 | 2021-04-20 | 圣邦微电子（北京）股份有限公司 | Low dropout regulator with high power supply rejection ratio |
| WO2022041011A1 (en) * | 2020-08-26 | 2022-03-03 | 华为技术有限公司 | Transient boost circuit for ldo, chip system and device |
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| CN109002077B (en) * | 2018-08-17 | 2020-07-10 | 电子科技大学 | Transient enhancement circuit |
| CN112148053A (en) * | 2019-06-28 | 2020-12-29 | 台湾积体电路制造股份有限公司 | Circuit and method for generating reference voltage and reference voltage generator |
| US11262778B2 (en) | 2019-06-28 | 2022-03-01 | Taiwan Semiconductor Manufacturing Company, Ltd. | Reference voltage generation |
| CN112684841A (en) * | 2019-10-18 | 2021-04-20 | 圣邦微电子（北京）股份有限公司 | Low dropout regulator with high power supply rejection ratio |
| CN112684841B (en) * | 2019-10-18 | 2022-04-01 | 圣邦微电子（北京）股份有限公司 | Low dropout regulator with high power supply rejection ratio |
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| WO2022041011A1 (en) * | 2020-08-26 | 2022-03-03 | 华为技术有限公司 | Transient boost circuit for ldo, chip system and device |
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