CN105528008B - A method and a system for adjusting chip output parameters without changing chip pins - Google Patents
A method and a system for adjusting chip output parameters without changing chip pins Download PDFInfo
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- CN105528008B CN105528008B CN201410522486.5A CN201410522486A CN105528008B CN 105528008 B CN105528008 B CN 105528008B CN 201410522486 A CN201410522486 A CN 201410522486A CN 105528008 B CN105528008 B CN 105528008B
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Abstract
The invention provides a method and a system for adjusting chip output parameters without changing chip pins. The method comprises the steps of: before a power source pin of a chip is electrified, namely, when the chip is not started, charging a decoupling capacitor of the power source pin by using a constant current source connected with an input pin of the chip; when the charging reaches a first preset voltage, detecting the charging characteristics of the decoupling capacitor; setting the corresponding output parameters by using the parameter variation quantity in the charging characteristics, wherein parameters in the charging characteristics of the decoupling capacitor include the capacitance of the decoupling capacitor, the charging current, the charging time and the charging voltage; continuing to charge the decoupling capacitor with the constant current source. The parameter variation quantity is obtained by changing the capacity of the decoupling capacitor of the power source pin of the chip, so that the output parameters of the chip can be flexibly set and adjusted by using the parameter variation quantity, the application range of the chip is widened, the restrictions of the type and number of chip pins are removed and the chip functions are increased.
Description
Technical field
The invention belongs to electronic circuit technology field, it is related to a kind of method of adjustment chip output parameter, more particularly to
A kind of method and system not changing chip pin adjustment chip output parameter.
Background technology
Under normal circumstances, the pin of chip and function are fixedly installed, and it is only applicable to specific scene domain, such as
Specific output voltage range, specific output current scope, specific overvoltage protection scope etc..The i.e. range of application of this chip
It is limited.
, it only has 3 pins, input pin, supply pin and grounding leg, does not have taking simple three end constant current devices as a example
Extra pin and element can control the isoparametric change of output current, and therefore its practical ranges is than relatively limited.As Fig. 1
Shown, three end constant current devices include input pin (Drain), supply pin (VCC), grounding leg (GND), switch (Qsw), control module
(Control), protection module (Protection), feedback module (Current sense and feedback), modulation module
(Regulator), Voltage stabilizing module (ZENER)；Wherein, the effect of modulation module (Regulator) is regulation power supply foot (VCC)
The size of supply voltage.If necessary to change the output parameter of three end constant current devices in Fig. 1 it is necessary to three end constant current devices have
Standby corresponding pin is realized controlling, and without unnecessary pin, the function of changing three end constant current device output parameters just cannot
Realize, unless chip does the function of built-in fixation, but function is once built-in to be secured, the scope of its output parameter is also just fixing
, just cannot realize being adjusted flexibly.
So, how to realize the change to chip output parameter on the premise of not changing chip pin it is simply that the present invention
Technical problem to be solved.
Content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide one kind does not change chip pin adjustment
The method and system of chip output parameter, need to increase extra control pipe for solving change chip output parameter in prior art
The problem of foot.
For achieving the above object and other related purposes, the present invention provides one kind not change chip pin adjustment chip output
The method of parameter, the described method not changing chip pin adjustment chip output parameter includes：Before electricity on the supply pin of chip
When i.e. described chip is not actuated, filled using the decoupling capacitor that the constant-current source being connected with the input pin of described chip is described supply pin
Electricity；When charging to the first predeterminated voltage, detect the charge characteristic of described decoupling capacitor；In the charge characteristic of described decoupling capacitor
Parameter include the capacitance of decoupling capacitor, charging current, charging interval, charging voltage；Using the Parameters variation in charge characteristic
Amount arranges the corresponding output parameter of described chip；Described constant-current source continues as described decoupling capacitor and charges.
Alternatively, the described method not changing chip pin adjustment chip output parameter also includes：Pre- charging to second
If during voltage, described chip starts, and is started working with the corresponding output parameter setting for initial value；Described second default electricity
Pressure is more than described first predeterminated voltage；Described constant-current source continues as described decoupling capacitor and charges.
Alternatively, the described method not changing chip pin adjustment chip output parameter also includes：When described chip is in work
When making the voltage of supply pin be down to described first predeterminated voltage after trigger protection during work, using the ginseng in described charge characteristic
Number variable quantity resets the corresponding output parameter of described chip；Described constant-current source continues as described decoupling capacitor and charges.
Alternatively, the described charge characteristic detecting described decoupling capacitor, using the Parameters variation amount setting in charge characteristic
One kind of the corresponding output parameter of described chip implements process and includes：Within the given charging interval, detection is gone with described
The change of the charging voltage of coupling capacitor's capacity change, wherein, the charging current that described constant-current source provides is changeless；Using
The variable quantity of described charging voltage arranges the corresponding output parameter of described chip.
Alternatively, the described charge characteristic detecting described decoupling capacitor, using the Parameters variation amount setting in charge characteristic
One kind of the corresponding output parameter of described chip implements process and includes：In fixing charging voltage excursion, detection
With the change in the charging interval of described decoupling capacitor capacitance change, wherein, the charging current that described constant-current source provides is to fix not
Become；With the variable quantity in described charging interval, the corresponding output parameter of described chip is set.
Alternatively, described corresponding output parameter includes output current, output voltage, overcurrent protection electric current or overvoltage protection
Voltage.
The present invention also provides a kind of system not changing chip pin adjustment chip output parameter, and the described chip that do not change draws
The system that foot adjusts chip output parameter is built in described chip, including：Charging module, including a constant-current source；Described constant current
The one end in source is connected with the input pin of described chip, and the other end of described constant-current source is connected with the supply pin of described chip, in core
When before electricity on the supply pin of piece, i.e. described chip is not actuated, it is that the decoupling capacitor of the supply pin of described chip charges；Detection module,
It is connected with the supply pin of described chip, when the voltage of described supply pin reaches the first predeterminated voltage, detect described decoupling capacitor
Charge characteristic；When parameter in the charge characteristic of described decoupling capacitor includes the capacitance of decoupling capacitor, charging current, charges
Between, charging voltage；Output parameter setup module, is connected with described detection module, is set using the Parameters variation amount in charge characteristic
Put the corresponding output parameter of described chip.
Alternatively, electricity or when charging to the second predeterminated voltage on the supply pin of described chip, described chip starts, and with
The corresponding output parameter setting is started working for initial value；The described system not changing chip pin adjustment chip output parameter
Electricity or quit work when charging to the second predeterminated voltage on the supply pin of described chip；Described second predeterminated voltage is more than described
First predeterminated voltage.
Alternatively, described Parameters variation amount is the charging voltage variable quantity of described decoupling capacitor；Described detection module includes：
First comparator, in the same direction input be connected with the supply pin of described chip, reverse input end connects described first predeterminated voltage, works as institute
When stating the voltage of supply pin and reaching the first predeterminated voltage, output detection control signal；Time controller, the power supply with described chip
Foot and first comparator are respectively connected with, and start to export described core in preset time period under the triggering of described detection control signal
The voltage signal of the supply pin of piece supplies subsequent detection；Voltage variety detection components, are connected with described time controller, detect institute
State voltage signal, obtain voltage variety；Described voltage variety detection components include at least 2 voltage comparators；Each electricity
The reverse input end of pressure comparator all connects a different reference voltage；The input in the same direction of each voltage comparator all with described when
Between controller outfan be connected；The output signal of each voltage comparator all represents a different voltage variety；Described
Output parameter setup module is connected with the outfan of described voltage variety detection components, receives described voltage variety detection
The output signal of each voltage comparator in assembly is all corresponding to obtain a different charging voltage variable quantity.
Alternatively, described Parameters variation amount is the charging interval variable quantity of described decoupling capacitor；Described detection module includes：
Second comparator, in the same direction input be connected with the supply pin of described chip, reverse input end connects described first predeterminated voltage, works as institute
When stating the voltage of supply pin and reaching the first predeterminated voltage, export the first comparison signal；3rd comparator, reverse input end with described
The supply pin of chip is connected, and input termination is more than the reference voltage of described first predeterminated voltage fixed value in the same direction, when described power supply
When the voltage of foot reaches described reference voltage, export the second comparison signal；Described output parameter setup module and the described second ratio
It is respectively connected with compared with the outfan of the outfan of device and the 3rd comparator, relatively described first comparison signal and the second comparison signal
Receive time difference and obtain charging interval variable quantity.
As described above, of the present invention do not change the method and system that chip pin adjusts chip output parameter, have
Following beneficial effect：
The capacity that the present invention passes through to change the decoupling capacitor of chip power foot obtains parametric variable, thus utilizing parametric variable
Realize the output parameter of chip flexibly being arranged and adjusting, so that the range of application of chip is widened, breach chip pipe
The restriction of pin class type and number increases chip functions, extends the range of chip.
Brief description
Fig. 1 is a kind of electrical block diagram of existing three end constant current devices.
Fig. 2 is that the one kind not changing the method that chip pin adjusts chip output parameter described in the embodiment of the present invention is realized
The schematic flow sheet of process.
Fig. 3 is the another kind of real of the method not changing chip pin adjustment chip output parameter described in the embodiment of the present invention
The schematic flow sheet of existing process.
Fig. 4 a and Fig. 4 b is the method not changing chip pin adjustment chip output parameter described in the embodiment of the present invention
The third realizes the schematic flow sheet of process.
Fig. 5 is that the one kind not changing the system that chip pin adjusts chip output parameter described in the embodiment of the present invention is realized
Structural representation.
Fig. 6 is that one kind of the detection module described in the embodiment of the present invention implements structural representation.
Fig. 7 is the work schedule schematic diagram of the detection module structure shown in Fig. 6.
Fig. 8 is that the another kind of the detection module described in the embodiment of the present invention implements structural representation.
Fig. 9 is the work schedule schematic diagram of the detection module structure shown in Fig. 8.
Figure 10 is that the one kind not changing the overvoltage protection that chip pin adjusts chip described in the embodiment of the present invention is realized
Structural representation.
Component label instructions
400 chips
410 input pins
420 supply pins
430 grounding legs
440 decoupling capacitors
450 output parameter control modules
460 controlling switches
470 feedback detection resistances
500 do not change chip pin adjustment chip
The system of output parameter
510 charging modules
511 constant-current sources
520 detection modules
521 first comparators
522 time controllers
523 voltage variety detection components
524 second comparators
525 the 3rd comparators
530 output parameter setup modules
S201～S206 step
Specific embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also be by addition different concrete realities
The mode of applying is carried out or applies, and the every details in this specification can also be based on different viewpoints and application, without departing from
Carry out various modifications and changes under the spirit of the present invention.
Refer to accompanying drawing.It should be noted that the diagram provided in the present embodiment only illustrates the present invention in a schematic way
Basic conception, only display and relevant assembly in the present invention rather than according to component count during actual enforcement, shape in schema then
Shape and size are drawn, and during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly cloth
Office's kenel is likely to increasingly complex.
In order to change the output parameter of existing chip, it is necessary for a variable element in chip circuit and goes to adjust, and
Chip internal circuits are fixedly installed, and element therein is immutable.And if arranging variable element in chip exterior,
Structure and the cost of chip exterior circuit undoubtedly can be increased.In order to solve this problem, the present invention have selected all chips
The decoupling capacitor that the outer member possessing is connected between chip power foot and grounding leg, does variable adjustment, no
But obtain the element of variable adjustment it is thus also avoided that increasing new chip exterior circuit and increasing cost.
With reference to embodiment and accompanying drawing, the present invention is described in detail.
Embodiment
The present embodiment provide a kind of does not change chip pin adjust chip output parameter method, as shown in Fig. 2 described not
The method changing chip pin adjustment chip output parameter includes：
S201, when before electricity on the supply pin of chip, i.e. described chip is not actuated, using the input pin of one and described chip
Connected constant-current source is that the decoupling capacitor of described supply pin charges.Described decoupling capacitor is generally disposed on chip exterior, and one
End is connected with the supply pin of chip, and the other end is connected with the grounding leg of chip.Described decoupling capacitor is typically used for carrying for chip
For power supply and filtering interfering.In actual applications, the startup of chip and power down have the requirement of individual time, and this requires to determine
The minimum capacitance of decoupling capacitor, in being normally applied, decoupling capacitor is all using fixing recommendation.But the present invention breaches this
Limitation mode of thinking, because decoupling capacitor is arranged at chip exterior, is convenient for changing the decoupling capacitor of different capacitances, this
Just the adjustment for chip output parameter provides basic underlying variables.Only guided by basic underlying variables, just enable this
Adjust the purpose of chip output parameter on the premise of not changing chip pin in bright.
S202, when charging to the first predeterminated voltage, detects the charge characteristic of described decoupling capacitor.Because each electronics unit
The startup of device and power down are required for the time, so the present embodiment just starts when decoupling capacitor charges to the first predeterminated voltage to examine
Survey its charge characteristic in order to obtain more stable testing result.Described first predeterminated voltage also has a purpose to be to ensure that
Internal module can normal work, otherwise during low pressure, some devices cannot meet working condition.
The present embodiment enumerates the mode of the charge characteristic of two kinds of described decoupling capacitors of detection：
One kind is：Within the given charging interval, the change of the charging voltage with the change of described decoupling capacitor capacitance for the detection.
Wherein, the charging current that described constant-current source provides is changeless.
Another kind is：In fixing charging voltage excursion, detection is with the charging of described decoupling capacitor capacitance change
The change of time.Wherein, the charging current that described constant-current source provides is changeless.
S203, arranges the corresponding output parameter of described chip using the Parameters variation amount in charge characteristic.Described decoupling electricity
Parameter in the charge characteristic held includes the capacitance of decoupling capacitor, charging current, charging interval, charging voltage.And then understand, institute
State Parameters variation amount be one of the capacitance variable quantity of decoupling capacitor, charging interval variable quantity, charging voltage variable quantity or
Several.Adopt constant current source charging because in the present embodiment, so charging current is changeless.Specifically select the change of which parameter
Variable based on change amount, can determine completely in actual applications as needed.For example：With two kinds enumerating in step S202
The mode of detection charge characteristic accordingly, can have two kinds of output parameter set-up modes.The first is, using the described electricity that charges
The variable quantity of pressure arranges the corresponding output parameter of described chip.Second is that the variable quantity using the described charging interval arranges institute
State the corresponding output parameter of chip.Described corresponding output parameter includes output current, output voltage, overcurrent protection electric current or mistake
The output parameters such as pressure protection voltage.Because in actual applications, the output parameter of different chips is different it may be possible to voltage,
It is also likely to be electric current it is also possible to overvoltage protection voltage or electric current, whether what type of output parameter, may be by this
Method described in embodiment is adjusted arranging, and therefore protection scope of the present invention is not limited to the type of output parameter.
S204, described constant-current source continues as described decoupling capacitor and charges.
Further, as shown in figure 3, described in the present embodiment do not change chip pin adjust chip output parameter method also
Can include：
S205, when charging to the second predeterminated voltage, described chip starts, and is first with the corresponding output parameter setting
Initial value is started working；Described constant-current source continues as described decoupling capacitor and charges.Wherein, described second predeterminated voltage is more than described the
One predeterminated voltage.When charging to the second predeterminated voltage, described chip starts starts working, the now work of step S202 and S203
It is over, that is, step S202 and the voltage of the supply pin being operated in chip of S203 reach the second predeterminated voltage (i.e. chip
Startup voltage) when just finish.Certainly, the present invention can also be by ensureing the present invention in chip internal design logic circuit
Being normally carried out of the described method not changing chip pin adjustment chip output parameter, excludes outside the supply pin reason of chip
Power supply is gone up suddenly electricity and leads to the situation that the setting of chip output parameter has not been completed to occur.
Further, as shown in fig. 4 a, the side not changing chip pin adjustment chip output parameter described in the present embodiment
Method can also include：
S206, makes the voltage of supply pin be down to the described first default electricity after described chip trigger protection in the course of the work
The corresponding output parameter of described chip during pressure, is reset using the Parameters variation amount in described charge characteristic；Described constant-current source
Continue as described decoupling capacitor to charge.The voltage of supply pin is made to be down to after generation chip in the course of the work trigger protection
The situation of described first predeterminated voltage, then return to step S202, again complete the setting of corresponding output parameter and chip again
Start, as shown in Figure 4 b.In the present embodiment, Fig. 4 a and Fig. 4 b are meant that identical.Generally system chips are because of trigger protection
After quit work, supply voltage can drop to below UVLO, then re-powers startup, realizes the self- recoverage after protection.The present invention
Output parameter can be reset by the use of UVLO voltage as the first predeterminated voltage during restarting, because chip
Working condition before cannot remembering.
In the present invention, only the setting when chip starts once, " is adjusted after chip normal work for the setting of chip output parameter
The method of whole chip output parameter " no longer works, and prevents from being disturbed.Additionally, chip output parameter be set in chip because of certain
Plant after error protection is restarted and can reset once, lost because of error protection with the information preventing from arranging.
The present embodiment also provides a kind of system not changing chip pin adjustment chip output parameter, and this system can be realized
Do not change, described in the present embodiment, the method that chip pin adjusts chip output parameter, but do not change chip described in the present embodiment
Pin adjust chip output parameter method realize structure include but is not limited to the present embodiment described in do not change chip pin
The system of adjustment chip output parameter.
As shown in figure 5, the described system 500 not changing chip pin adjustment chip output parameter is built in described chip
In 400, including：Charging module 510, detection module 520, output parameter setup module 530.Described chip 400 is provided with input
Foot 410, supply pin 420, grounding leg 430, decoupling capacitor 440, output parameter control module 450, controlling switch 460, feedback inspection
Measuring resistance 470, wherein, output parameter control module 450 is connected with supply pin 420, accepts the power supply of power supply；Output parameter controls
Module 450 is connected with controlling switch 460, controls output parameter by controlling switch；Feedback detection resistance 470 one end and grounding leg
430 are connected, and the other end is respectively connected with controlling switch 460 and output parameter control module, provides internal feedback control signal.
The chip that the present invention is suitable for is not limited to the chip structure that the present embodiment is enumerated, and every chip possessing control output parameter function is all
Including in chip range of the present invention.
Described charging module 510 includes a constant-current source 511.One end of described constant-current source 511 and the input of described chip 400
Foot 410 is connected, and the other end of described constant-current source 511 is connected with the supply pin 420 of described chip 400, in the supply pin of chip 400
When before electricity on 420, i.e. described chip is not actuated, it is that the decoupling capacitor 440 of the supply pin 420 of described chip 400 charges.Described go
Coupling electric capacity 440 is generally disposed on outside chip 400, and one end is connected with the supply pin 420 of chip 400, the other end and chip
400 grounding leg 430 is connected.
Described detection module 520 is connected with the supply pin 420 of described chip 400, reaches in the voltage of described supply pin 420
During the first predeterminated voltage, detect the charge characteristic of described decoupling capacitor 440.Detect the charge characteristic of described decoupling capacitor 440
Mode can have multiple, the realizing structure and can also have multiple of every kind of detection mode, and therefore protection scope of the present invention is not limited to
Described detection module 520 implement structure.
Further, the present embodiment enumerates the structure of realizing of two kinds of described detection modules, respectively as seen in figs. 6 and 8.
Referring to Fig. 6, described detection module 520 includes：First comparator 521, time controller 522, voltage variety is examined
Survey assembly 523.The input in the same direction of described first comparator 521 is connected with the supply pin 420 of described chip 400, reversely inputs
Terminate described first predeterminated voltage, when the voltage of described supply pin reaches the first predeterminated voltage, output detection control signal.Institute
State time controller 522 to be respectively connected with the supply pin 420 of described chip 400 and first comparator 521, control in described detection
The voltage signal starting to export the supply pin of described chip under the triggering of signal in preset time period supplies subsequent detection.Described electricity
Pressure variable quantity detection components 523 are connected with described time controller 522, detect described voltage signal, obtain voltage variety.Institute
State voltage variety detection components and include at least 2 voltage comparators；The reverse input end of each voltage comparator all connects one not
Same reference voltage；The input in the same direction of each voltage comparator is all connected with the outfan of described time controller；Each electricity
The output signal of pressure comparator all represents a different voltage variety.Obtained using the detection module of structure shown in Fig. 6
Parameters variation amount is the charging voltage variable quantity of described decoupling capacitor.
The specific work process of the detection module of structure shown in Fig. 6 is：Chip 400 is each on startup, its internal perseverance
Stream source 511 is from high pressure Drain end (i.e. the input pin 410 of chip 400) to CVCC(i.e. decoupling capacitor) charges, when VCC voltage reaches
During UVLO OFF (i.e. the first predeterminated voltage), chip 400 internal detection circuitry (includes first comparator 521, time controller
522, the detection module 520 of voltage variety detection components 523) open time of fixing Δ T, VCC electricity in detection this period
The degree that pressure rises, according to different voltage thus setting the parameters such as different output currents.Decoupling capacitor CVCCCharge formula
For C × Δ V=I × Δ T.Because being constant current source charging, therefore electric capacity CVCCThe change of upper voltage is with charging interval linear change
, when I × Δ T is fixing, the C of different capabilities can produce different voltage Δ V, just can be set accordingly by detecting Δ V
The output parameters such as output current.Chip has one section of process from starting between normal work, and constant-current source has input exactly
It is among this section of process, after that is, chip starts, a period of time constant-current source begins with input, and constant-current source charges for decoupling capacitor
To the second predeterminated voltage, chip is just started working.
Fig. 7 is the work schedule schematic diagram of the detection module of structure shown in Fig. 6.Wherein, t0_x represents different electric capacity Cx's
Charging starting point, that is, t0_1 represent the charging starting point of electric capacity C1, t0_2 represents the charging starting point of electric capacity C2, and t0_3 represents electric capacity C3's
Charging starting point.The electricity rising in the detection Δ T time when the voltage of decoupling capacitor reaches UVLO OFF (i.e. the first predeterminated voltage)
Press and arrange corresponding output parameter.When VCC voltage rises to UVLO ON (i.e. the second predeterminated voltage), chip starts regular employee
Export.Only the setting when chip starts once, detects after chip startup work that setting circuit (detects for the setting of output parameter
Module 520 and the circuit of output parameter setup module 530 composition) just no longer work, prevent the fluctuation of VCC voltage from disturbing chip
Normal work.When chip trigger certain protection after VCC voltage drop to UVLO OFF when, VCC voltage can re-power, and now can
Reset an output parameter, the loss of configuration information before preventing.
Referring to Fig. 8, described detection module 520 includes：Second comparator 524, the second comparator 525.Described second compares
The input in the same direction of device 524 is connected with the supply pin 420 of described chip 400, and reverse input end connects described first predeterminated voltage；When
When the voltage of described supply pin 420 reaches the first predeterminated voltage, described second comparator 524 exports the first comparison signal.Described
The reverse input end of the 3rd comparator 525 is connected with the supply pin 420 of described chip 400, and input termination is more than described the in the same direction
The reference voltage of one predeterminated voltage fixed value；When the voltage of described supply pin 420 reaches described reference voltage, described 3rd ratio
Export the second comparison signal compared with device 525.The reception time difference of the first comparison signal and the second comparison signal is charging interval change
Change amount.It is the charging interval change of described decoupling capacitor using the Parameters variation amount that the detection module of structure shown in Fig. 8 obtains
Amount.
The specific work process of the detection module of structure shown in Fig. 8 is：The each internal on startup constant-current source of chip 400
511 from high pressure Drain end to CVCCCharge, when VCC voltage reaches UVLO OFF, comparator OP1 exports high electricity in the t1 time
Flat, internal current setting circuit is started working；When VCC voltage reaches UVLO+ Δ V, comparator OP2 exports low electricity in the t2 time
Flat, internal current setting circuit quits work.Due to CVCCCapacity different, when VCC voltage is from UVLO OFF to UVLO+ Δ V
The time difference that may result in t2-t1 is different, and therefore internal circuit just can arrange different output parameters.Reach in VCC voltage
Chip life's work during UVLO ON.Equally, action is once, heavy when VCC is restarted on startup for the setting action of output parameter
New setting is once.Fig. 9 is the work schedule schematic diagram of the detection module of structure shown in Fig. 8.
Described output parameter setup module 530 is connected with described detection module 520, using the Parameters variation in charge characteristic
Amount arranges the corresponding output parameter of described chip 400.Parameter in the charge characteristic of described decoupling capacitor 440 includes decoupling capacitor
Capacitance, charging current, the charging interval, charging voltage.
If detection module 520 is detected using the structure shown in Fig. 6, accordingly, described output parameter setup module 530
Then it is connected with the outfan of described voltage variety detection components 523, according to the described voltage variety detection components receiving
In each voltage comparator output signal all corresponding obtain a different charging voltage variable quantity, and utilize charge characteristic
In charging voltage variable quantity (i.e. Parameters variation amount) the corresponding output parameter of described chip 400 is set.
If detection module 520 is detected using the structure shown in Fig. 8, accordingly, described output parameter setup module 520
Then it is respectively connected with the described outfan of the second comparator 524 and the outfan of the 3rd comparator 525, relatively described first compares
The reception time difference of signal and the second comparison signal obtains charging interval variable quantity, and is become using the charging interval in charge characteristic
Change amount (i.e. Parameters variation amount) arranges the corresponding output parameter of described chip 400.
In some applications, output current itself can be adjusted, and now the present invention just can adjust output over-voltage protection,
As shown in Figure 10, wherein R1 is current regulating resistance.
Electricity or when charging to the second predeterminated voltage on the supply pin 420 of described chip 400, described chip 400 starts, and
Started working with the corresponding output parameter setting for initial value.Described do not change chip pin adjust chip output parameter be
System 500 electricity or quit work when charging to the second predeterminated voltage on the supply pin 420 of described chip；Described second predeterminated voltage
More than described first predeterminated voltage.
The capacity that the present invention passes through to change the decoupling capacitor of chip power foot obtains parametric variable, thus utilizing parametric variable
Realize the output parameter of chip flexibly being arranged and adjusting, so that the range of application of chip is widened.Additionally, the present invention is only
Using the decoupling capacitor of the supply pin arriving, input pin, grounding leg and supply pin, it is all the structure that existing chip all possesses, own
The method and system of adjustment chip output parameter of the present invention is applied to all chips.The present invention breaches chip pin class
The restriction of type and number increases chip functions, extends the range of chip.
What the method and system not changing chip pin adjustment chip output parameter of the present invention changed can be defeated
Go out electric current, can be the output ginseng needing adjustment during the practical application such as output voltage or output protection voltage/current
Number, is not limited solely to the setting of the output current cited by the present embodiment.
The change scope of the output parameter in the present invention depends on the selection of decoupling capacitor and the span of control of chip voltage,
And it is not limited to the scope that the present embodiment is enumerated.
The range of application of the present invention is not limited to the chip of 3 pins that the present embodiment is enumerated, and also includes possessing more multi-pipe pin
Chip.As long as but chip occurs needing to realize adjustment function the situation not having pin spare, it is all suitable for the present invention.
The present invention not only in the buck configuration that the present embodiment is enumerated it is achieved that also can be real in other topological structure
Existing.
In sum, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment only principle of the illustrative present invention and its effect, not for the restriction present invention.Any ripe
The personage knowing this technology all can carry out modifications and changes without prejudice under the spirit and the scope of the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
All equivalent modifications becoming or change, must be covered by the claim of the present invention.
Claims (10)
1. a kind of chip pin that do not change adjusts the method for chip output parameter it is characterised in that described do not change chip pin
The method of adjustment chip output parameter includes：
When before electricity on the supply pin of chip, i.e. described chip is not actuated, using the constant-current source being connected with the input pin of described chip
Decoupling capacitor for described supply pin charges；
When charging to the first predeterminated voltage, detect the charge characteristic of described decoupling capacitor；The charge characteristic of described decoupling capacitor
In parameter include the capacitance of decoupling capacitor, charging current, charging interval, charging voltage；
The corresponding output parameter of described chip is set using the Parameters variation amount in charge characteristic；
Described constant-current source continues as described decoupling capacitor and charges.
2. the chip pin that do not change according to claim 1 adjusts the method for chip output parameter it is characterised in that described
The method not changing chip pin adjustment chip output parameter also includes：
When charging to the second predeterminated voltage, described chip starts, and is started with the corresponding output parameter setting for initial value
Work；Described second predeterminated voltage is more than described first predeterminated voltage；Described constant-current source continues as described decoupling capacitor and charges.
3. the chip pin that do not change according to claim 2 adjusts the method for chip output parameter it is characterised in that described
The method not changing chip pin adjustment chip output parameter also includes：
When making the voltage of supply pin be down to described first predeterminated voltage after described chip in the course of the work trigger protection, utilize
Parameters variation amount in described charge characteristic resets the corresponding output parameter of described chip；Described constant-current source continues as described
Decoupling capacitor charges.
4. the chip pin that do not change according to claim 1 adjusts the method for chip output parameter it is characterised in that described
Detect the charge characteristic of described decoupling capacitor, the corresponding output ginseng of described chip is set using the Parameters variation amount in charge characteristic
One kind of number implements process and includes：
Within the given charging interval, the change of the charging voltage with the change of described decoupling capacitor capacitance for the detection, wherein, described perseverance
The charging current that stream source provides is changeless；
Variable quantity using described charging voltage arranges the corresponding output parameter of described chip.
5. the chip pin that do not change according to claim 1 adjusts the method for chip output parameter it is characterised in that described
Detect the charge characteristic of described decoupling capacitor, the corresponding output ginseng of described chip is set using the Parameters variation amount in charge characteristic
One kind of number implements process and includes：
In fixing charging voltage excursion, the change in the charging interval with the change of described decoupling capacitor capacitance for the detection, its
In, the charging current that described constant-current source provides is changeless；
With the variable quantity in described charging interval, the corresponding output parameter of described chip is set.
6. the method not changing chip pin adjustment chip output parameter according to claim 1 to 5 any one, it is special
Levy and be：Described corresponding output parameter includes output current, output voltage, overcurrent protection electric current or overvoltage protection voltage.
7. a kind of do not change chip pin adjust chip output parameter system it is characterised in that：Described do not change chip pin
The system of adjustment chip output parameter is built in described chip, including：
Charging module, including a constant-current source；One end of described constant-current source is connected with the input pin of described chip, described constant-current source
The other end is connected with the supply pin of described chip, when before electricity on the supply pin of chip, i.e. described chip is not actuated, is described core
The decoupling capacitor of the supply pin of piece charges；
Detection module, is connected with the supply pin of described chip, when the voltage of described supply pin reaches the first predeterminated voltage, detection
The charge characteristic of described decoupling capacitor；Parameter in the charge characteristic of described decoupling capacitor includes the capacitance of decoupling capacitor, charging
Electric current, charging interval, charging voltage；
Output parameter setup module, is connected with described detection module, arranges described core using the Parameters variation amount in charge characteristic
The corresponding output parameter of piece.
8. according to claim 7 do not change chip pin adjust chip output parameter system it is characterised in that：Institute
When stating on the supply pin of chip electricity or charging to the second predeterminated voltage, described chip starts, and the corresponding output ginseng to set
Number is started working for initial value；The described supply pin in described chip for the system not changing chip pin adjustment chip output parameter
Upper electricity or charge to and quit work during the second predeterminated voltage；Described second predeterminated voltage is more than described first predeterminated voltage.
9. the chip pin that do not change according to claim 7 adjusts the system of chip output parameter it is characterised in that described
Parameters variation amount is the charging voltage variable quantity of described decoupling capacitor；
Described detection module includes：
First comparator, in the same direction input be connected with the supply pin of described chip, reverse input end connects described first predeterminated voltage,
When the voltage of described supply pin reaches the first predeterminated voltage, output detection control signal；
Time controller, is respectively connected with the supply pin of described chip and first comparator, in touching of described detection control signal
The voltage signal giving the supply pin starting to export described chip in preset time period supplies subsequent detection；
Voltage variety detection components, are connected with described time controller, detect described voltage signal, obtain voltage variety；
Described voltage variety detection components include at least 2 voltage comparators；The reverse input end of each voltage comparator is equal
Connect different reference voltages；The input in the same direction of each voltage comparator is all connected with the outfan of described time controller；Often
The output signal of individual voltage comparator all represents different voltage varieties；
Described output parameter setup module is connected with the outfan of described voltage variety detection components, receives described voltage and becomes
The output signal of each voltage comparator in change amount detection components is all corresponding to obtain different charging voltage variable quantities.
10. the chip pin that do not change according to claim 7 adjusts the system of chip output parameter it is characterised in that institute
State the charging interval variable quantity that Parameters variation amount is described decoupling capacitor；
Described detection module includes：
Second comparator, in the same direction input be connected with the supply pin of described chip, reverse input end connects described first predeterminated voltage,
When the voltage of described supply pin reaches the first predeterminated voltage, export the first comparison signal；
3rd comparator, reverse input end is connected with the supply pin of described chip, and input termination is preset more than described first in the same direction
The reference voltage of voltage fixed value, when the voltage of described supply pin reaches described reference voltage, exports the second comparison signal；
Described output parameter setup module is respectively connected with the outfan of described second comparator and the outfan of the 3rd comparator,
The reception time difference of relatively described first comparison signal and the second comparison signal obtains charging interval variable quantity.
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| WO2017201691A1 (en) * | 2016-05-25 | 2017-11-30 | 无锡矽瑞微电子股份有限公司 | Vcc capacitor-based control circuit programming system and method |
| CN107389994B (en) * | 2017-07-28 | 2023-08-22 | 杭州思泰微电子有限公司 | Configurable pin multiplexing method and system applied to current sensor chip |
| CN107493099B (en) * | 2017-08-22 | 2021-11-26 | 钰泰半导体股份有限公司 | Method for setting chip working mode |
| CN110286729A (en) * | 2019-05-21 | 2019-09-27 | 晶晨半导体(上海)股份有限公司 | A method of the power supply Vtune parameter for grafting reactants processor |
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| CN101414783A (en) * | 2007-09-10 | 2009-04-22 | 密执安大学评议会 | On-chip power supply voltage regulation |
| CN101968668A (en) * | 2009-10-22 | 2011-02-09 | 中兴通讯股份有限公司 | Power supply chip and method for adjusting output voltage of same |
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| US8427224B2 (en) * | 2011-07-26 | 2013-04-23 | National Chiao Tung University | On-chip active decoupling capacitors for regulating voltage of an integrated circuit |
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| CN101414783A (en) * | 2007-09-10 | 2009-04-22 | 密执安大学评议会 | On-chip power supply voltage regulation |
| CN101968668A (en) * | 2009-10-22 | 2011-02-09 | 中兴通讯股份有限公司 | Power supply chip and method for adjusting output voltage of same |
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