CN105528008A - 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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- CN105528008A CN105528008A CN201410522486.5A CN201410522486A CN105528008A CN 105528008 A CN105528008 A CN 105528008A CN 201410522486 A CN201410522486 A CN 201410522486A CN 105528008 A CN105528008 A CN 105528008A
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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, relate to a kind of method adjusting chip output parameter, particularly relate to a kind of method and system not changing chip pin adjustment chip output parameter.
Background technology
Under normal circumstances, pin and the function of chip are fixedly installed, and it is only applicable to specific scene domain, as specific output voltage range, and specific output current scope, specific overvoltage protection scope etc.Namely the range of application of this chip is limited.
For simple three end constant current devices, it only has 3 pins, input pin, supply pin and grounding leg, and do not have extra pin and element can control the isoparametric change of output current, therefore its practical ranges is more limited.As shown in Figure 1, three end constant current devices comprise input pin (Drain), supply pin (VCC), grounding leg (GND), switch (Qsw), control module (Control), protection module (Protection), feedback module (Currentsenseandfeedback), modulation module (Regulator), Voltage stabilizing module (ZENER); Wherein, the effect of modulation module (Regulator) is the size of the supply voltage regulating supply pin (VCC).If need the output parameter of the three end constant current devices changed in Fig. 1, just need three end constant current devices to possess corresponding pin to realize controlling, if there is no unnecessary pin, the function changing three end constant current device output parameters just cannot realize, unless chip does built-in fixing function, but function is once built-inly secure, and the scope of its output parameter also just secures, and just cannot realize have adjusted flexibly.
So, under the prerequisite not changing chip pin, how to realize the change to chip output parameter, be exactly technical matters to be solved by this invention.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of method and system not changing chip pin adjustment chip output parameter, for solving in prior art the problem changing chip output parameter and need to increase extra control pin.
For achieving the above object and other relevant objects, the invention provides a kind of method not changing chip pin adjustment chip output parameter, the described method not changing chip pin adjustment chip output parameter comprises: when before the supply pin of chip powers on, namely described chip does not start, and utilizes the constant current source be connected with the input pin of described chip to be that the decoupling capacitor of described supply pin charges; When charging to the first predeterminated voltage, detect the charge characteristic of described decoupling capacitor; Parameter in the charge characteristic of described decoupling capacitor comprises the capacitance of decoupling capacitor, charging current, duration of charging, charging voltage; Utilize the Parameters variation amount in charge characteristic that the corresponding output parameter of described chip is set; Described constant current source continues as the charging of described decoupling capacitor.
Alternatively, the described method not changing chip pin adjustment chip output parameter also comprises: when charging to the second predeterminated voltage, described chip enable, and with the corresponding output parameter set for initial value is started working; Described second predeterminated voltage is greater than described first predeterminated voltage; Described constant current source continues as the charging of described decoupling capacitor.
Alternatively, the described method not changing chip pin adjustment chip output parameter also comprises: 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 the Parameters variation amount in described charge characteristic to reset the corresponding output parameter of described chip; Described constant current source continues as the charging of described decoupling capacitor.
Alternatively, the charge characteristic of the described decoupling capacitor of described detection, a kind of specific implementation process utilizing the Parameters variation amount in charge characteristic to arrange the corresponding output parameter of described chip comprises: within the given duration of charging, detect the change of the charging voltage with described decoupling capacitor capacitance change, wherein, the charging current that described constant current source provides is changeless; Utilize the variable quantity of described charging voltage that the corresponding output parameter of described chip is set.
Alternatively, the charge characteristic of the described decoupling capacitor of described detection, a kind of specific implementation process utilizing the Parameters variation amount in charge characteristic to arrange the corresponding output parameter of described chip comprises: in fixing charging voltage variation range, detect the change in the duration of charging with described decoupling capacitor capacitance change, wherein, the charging current that described constant current source provides is changeless; The corresponding output parameter of described chip is set with the variable quantity in described duration of charging.
Alternatively, described corresponding output parameter comprises 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 system not changing chip pin adjustment chip output parameter is built in described chip, comprising: charging module, comprises a constant current source; One end of described constant current 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, when before the supply pin of chip powers on, namely described chip does not start, for the decoupling capacitor of the supply pin of described chip charges; Detection module, is connected with the supply pin of described chip, when the voltage of described supply pin reaches the first predeterminated voltage, detects the charge characteristic of described decoupling capacitor; Parameter in the charge characteristic of described decoupling capacitor comprises the capacitance of decoupling capacitor, charging current, duration of charging, charging voltage; Output parameter arranges module, is connected with described detection module, utilizes the Parameters variation amount in charge characteristic to arrange the corresponding output parameter of described chip.
Alternatively, when the supply pin of described chip powers on or charges to the second predeterminated voltage, described chip enable, and with the corresponding output parameter set for initial value is started working; The described system not changing chip pin adjustment chip output parameter quits work when the supply pin of described chip powers on or charge to the second predeterminated voltage; Described second predeterminated voltage is greater than described first predeterminated voltage.
Alternatively, described Parameters variation amount is the charging voltage variable quantity of described decoupling capacitor; Described detection module comprises: the first comparer, and input end is connected with the supply pin of described chip in the same way, and reverse input end connects described first predeterminated voltage, when the voltage of described supply pin reaches the first predeterminated voltage, and output detections control signal; Time controller, is connected with the first comparer respectively with the supply pin of described chip, starts the voltage signal of the supply pin exporting described chip in preset time period for subsequent detection under the triggering of described detection control signal; Voltage variety detection components, is connected with described time controller, detects described voltage signal, obtains voltage variety; Described voltage variety detection components comprises at least 2 voltage comparators; The reverse input end of each voltage comparator all connects a different reference voltage; The input end in the same way of each voltage comparator is all connected with the output terminal of described time controller; The output signal of each voltage comparator all represents a different voltage variety; Described output parameter arranges module and is connected with the output terminal of described voltage variety detection components, receives the charging voltage variable quantity that all corresponding acquisition one of output signal of each voltage comparator in described voltage variety detection components is different.
Alternatively, described Parameters variation amount is the duration of charging variable quantity of described decoupling capacitor; Described detection module comprises: the second comparer, and input end is connected with the supply pin of described chip in the same way, and reverse input end connects described first predeterminated voltage, when the voltage of described supply pin reaches the first predeterminated voltage, exports the first comparison signal; 3rd comparer, reverse input end is connected with the supply pin of described chip, inputs the reference voltage that termination is greater than described first predeterminated voltage fixed value in the same way, when the voltage of described supply pin reaches described reference voltage, exports the second comparison signal; Described output parameter arranges module and is connected respectively with the output terminal of the 3rd comparer with the output terminal of described second comparer, and the time of reception difference of more described first comparison signal and the second comparison signal obtains duration of charging variable quantity.
As mentioned above, the method and system not changing chip pin adjustment chip output parameter of the present invention, have following beneficial effect:
The present invention obtains parametric variable by the capacity changing the decoupling capacitor of chip power pin, thus utilize parametric variable to realize arranging flexibly the output parameter of chip and adjusting, the range of application of chip is widened, the restriction breaching chip pin type and number increases chip functions, extends the usable range of chip.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of existing a kind of three end constant current devices.
Fig. 2 is the schematic flow sheet not changing a kind of implementation procedure of the method for chip pin adjustment chip output parameter described in the embodiment of the present invention.
Fig. 3 is the schematic flow sheet not changing the another kind of implementation procedure of the method for chip pin adjustment chip output parameter described in the embodiment of the present invention.
Fig. 4 a and Fig. 4 b is the schematic flow sheet not changing the third implementation procedure of the method for chip pin adjustment chip output parameter described in the embodiment of the present invention.
Fig. 5 realizes structural representation for the one not changing the system of chip pin adjustment chip output parameter described in the embodiment of the present invention.
A kind of specific implementation structural representation that Fig. 6 is the detection module described in the embodiment of the present invention.
Fig. 7 is the work schedule schematic diagram of the detection module structure shown in Fig. 6.
The another kind of specific implementation structural representation that Fig. 8 is the detection module described in the embodiment of the present invention.
Fig. 9 is the work schedule schematic diagram of the detection module structure shown in Fig. 8.
Figure 10 realizes structural representation for the one of overvoltage protection not changing chip pin adjustment chip described in the embodiment of the present invention.
Element numbers explanation
400 chips
410 input pins
420 supply pins
430 grounding legs
440 decoupling capacitors
450 output parameter control modules
460 gauge tap
470 feedbacks detect resistance
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 comparers
522 time controllers
523 voltage variety detection components
524 second comparers
525 the 3rd comparers
530 output parameters arrange module
S201 ~ S206 step
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to accompanying drawing.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
In order to change the output parameter of existing chip, a variable element just must be had in chip circuit to do adjustment, and chip internal circuits is fixedly installed, element is wherein immutable.And if in chip exterior, variable element is set, structure and the cost of chip exterior circuit can be increased undoubtedly.In order to address this problem, the present invention have selected the outer member that all chips all possess---be connected to the decoupling capacitor between chip power pin and grounding leg, do variable adjustment, not only obtain the element of variable adjustment, also avoid and increase new chip exterior circuit and increase cost.
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
Embodiment
The present embodiment provides a kind of method not changing chip pin adjustment chip output parameter, and as shown in Figure 2, the described method not changing chip pin adjustment chip output parameter comprises:
Namely S201, when described chip does not start before the supply pin of chip powers on, utilizes a constant current source be connected with the input pin of described chip to be that the decoupling capacitor of described supply pin charges.Described decoupling capacitor is normally arranged at 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 to be usually used to chip and to provide power supply and filtering interfering.In actual applications, the startup of chip and power down have the requirement of individual time, and this requires the minimum capacitance determining decoupling capacitor, and in general application, decoupling capacitor all uses fixing recommendation.But the present invention breaches this limitation mode of thinking, because decoupling capacitor is arranged at chip exterior, so be convenient for changing the decoupling capacitor of different capacitance, this also just provides basic underlying variables for the adjustment of chip output parameter.Only guided by basic underlying variables, the object adjusting chip output parameter in the present invention under the prerequisite not changing chip pin could be realized.
S202, when charging to the first predeterminated voltage, detects the charge characteristic of described decoupling capacitor.Because the startup of each electronic devices and components and power down all need the time, just so the present embodiment starts when decoupling capacitor charges to the first predeterminated voltage to detect its charge characteristic, object is to obtain more stable testing result.Described first predeterminated voltage also has an object to be ensure that internal module can normally work, otherwise during low pressure, some device cannot meet condition of work.
The present embodiment enumerates the mode that two kinds are detected the charge characteristic of described decoupling capacitor:
One is: within the given duration of charging, detects the change of the charging voltage with described decoupling capacitor capacitance change.Wherein, the charging current that described constant current source provides is changeless.
Another kind is: in fixing charging voltage variation range, detects the change in the duration of charging with described decoupling capacitor capacitance change.Wherein, the charging current that described constant current source provides is changeless.
S203, utilizes the Parameters variation amount in charge characteristic to arrange the corresponding output parameter of described chip.Parameter in the charge characteristic of described decoupling capacitor comprises the capacitance of decoupling capacitor, charging current, duration of charging, charging voltage.And then known, described Parameters variation amount is one or more in the capacitance variable quantity of decoupling capacitor, duration of charging variable quantity, charging voltage variable quantity.Because adopting constant current source charging in the present embodiment, so charging current is changeless.Variable based on the variable quantity specifically selecting which parameter, can determine completely in actual applications as required.Such as: detect the mode of charge characteristic accordingly with two kinds that enumerate in step S202, two kinds of output parameter set-up modes can be had.The first is utilize the variable quantity of described charging voltage to arrange the corresponding output parameter of described chip.The second is, utilizes the variable quantity in described duration of charging to arrange the corresponding output parameter of described chip.Described corresponding output parameter comprises the output parameters such as output current, output voltage, overcurrent protection electric current or overvoltage protection voltage.Because in actual applications; the output parameter of different chip is different; may be voltage; also may be electric current; may be also overvoltage protection voltage or electric current; no matter be the output parameter of which kind of type, the method described in the present embodiment can be utilized to carry out adjustment and arrange, therefore protection scope of the present invention is not limited to the type of output parameter.
S204, described constant current source continues as the charging of described decoupling capacitor.
Further, as shown in Figure 3, the method not changing chip pin adjustment chip output parameter described in the present embodiment can also comprise:
S205, when charging to the second predeterminated voltage, described chip enable, and with the corresponding output parameter set for initial value is started working; Described constant current source continues as the charging of described decoupling capacitor.Wherein, described second predeterminated voltage is greater than described first predeterminated voltage.When charging to the second predeterminated voltage, described chip enable is started working, the now work of step S202 and S203 terminates, and namely the voltage being operated in the supply pin of chip of step S202 and S203 reaches the second predeterminated voltage (i.e. the trigger voltage of chip) time and just finishes.Certainly, the present invention can also by ensureing at chip internal design logic circuit of the present inventionly not change normally carrying out of the method for chip pin adjustment chip output parameter, the situation appearance that the supply pin reason external power source getting rid of chip powers on suddenly and causes chip output parameter to arrange also not completing.
Further, as shown in fig. 4 a, the method not changing chip pin adjustment chip output parameter described in the present embodiment can also comprise:
S206, 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, utilizes the Parameters variation amount in described charge characteristic to reset the corresponding output parameter of described chip; Described constant current source continues as the charging of described decoupling capacitor.Namely make the voltage of supply pin be down to the situation of described first predeterminated voltage after trigger protection in the course of the work once there is chip, then return step S202, again complete the setting of corresponding output parameter and restarting of chip, as shown in Figure 4 b.In the present embodiment, the implication of Fig. 4 a and Fig. 4 b is identical.Usual system chips is because quitting work after trigger protection, and supply voltage can drop to below UVLO, then re-powers startup, realizes the self-recoverage after protection.The present invention can utilize UVLO voltage as the first predeterminated voltage, in the process restarted, reset output parameter because chip cannot remember before duty.
In the present invention, the setting of chip output parameter is only arranged once when chip enable, and after chip normally works, " method of adjustment chip output parameter " no longer works, and prevents from being disturbed.In addition, chip output parameter be set in chip because of certain emergency protection restart after can reset once, with prevent arrange information lose because of emergency protection.
The present embodiment also provides a kind of system not changing chip pin adjustment chip output parameter, this system can realize the method not changing chip pin adjustment chip output parameter described in the present embodiment, but described in the present embodiment do not change the method for chip pin adjustment chip output parameter realize the system not changing chip pin adjustment chip output parameter that structure includes but not limited to described in the present embodiment.
As shown in Figure 5, the described system 500 not changing chip pin adjustment chip output parameter is built in described chip 400, and comprising: charging module 510, detection module 520, output parameter arranges module 530.Described chip 400 is provided with input pin 410, supply pin 420, grounding leg 430, decoupling capacitor 440, output parameter control module 450, gauge tap 460, feedback detects resistance 470, wherein, output parameter control module 450 is connected with supply pin 420, accepts the power supply of power supply; Output parameter control module 450 is connected with gauge tap 460, controls output parameter by gauge tap; Feedback detects resistance 470 one end and is connected with grounding leg 430, and the other end is connected respectively with gauge tap 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 included in chip range of the present invention.
Described charging module 510 comprises a constant current source 511.One end of described constant current source 511 is connected with the input pin 410 of described chip 400, the other end of described constant current source 511 is connected with the supply pin 420 of described chip 400, when before the supply pin 420 of chip 400 powers on, namely described chip does not start, for the decoupling capacitor 440 of the supply pin 420 of described chip 400 charges.It is outside that described decoupling capacitor 440 is normally arranged at chip 400, and one end is connected with the supply pin 420 of chip 400, and the other end is connected with the grounding leg 430 of chip 400.
Described detection module 520 is connected with the supply pin 420 of described chip 400, when the voltage of described supply pin 420 reaches the first predeterminated voltage, detects the charge characteristic of described decoupling capacitor 440.The mode detecting the charge characteristic of described decoupling capacitor 440 can have multiple, the realizing structure and also can have multiple of often kind of detection mode, and therefore protection scope of the present invention is not limited to the specific implementation structure of described detection module 520.
Further, what the present embodiment enumerated two kinds of described detection modules realizes structure, respectively as seen in figs. 6 and 8.
See Fig. 6, described detection module 520 comprises: the first comparer 521, time controller 522, voltage variety detection components 523.The input end in the same way of described first comparer 521 is connected with the supply pin 420 of described chip 400, and reverse input end connects described first predeterminated voltage, when the voltage of described supply pin reaches the first predeterminated voltage, and output detections control signal.Described time controller 522 is connected with the first comparer 521 respectively with the supply pin 420 of described chip 400, starts the voltage signal of the supply pin exporting described chip in preset time period for subsequent detection under the triggering of described detection control signal.Described voltage variety detection components 523 is connected with described time controller 522, detects described voltage signal, obtains voltage variety.Described voltage variety detection components comprises at least 2 voltage comparators; The reverse input end of each voltage comparator all connects a different reference voltage; The input end in the same way of each voltage comparator is all connected with the output terminal of described time controller; The output signal of each voltage comparator all represents a different voltage variety.The Parameters variation amount utilizing the detection module of structure shown in Fig. 6 to obtain is the charging voltage variable quantity of described decoupling capacitor.
The specific works process of the detection module of structure shown in Fig. 6 is: chip 400 is at every turn when starting, and the constant current source 511 of its inside holds (i.e. the input pin 410 of chip 400) to C from high pressure Drain
vCC(i.e. decoupling capacitor) charges, when VCC voltage reaches UVLOOFF (i.e. the first predeterminated voltage), chip 400 internal detection circuitry (namely comprises the first comparer 521, time controller 522, the detection module 520 of voltage variety detection components 523) open time of fixing Δ T, detect the degree of VCC voltage rise during this period of time, set the parameters such as different output currents according to different voltage.Decoupling capacitor C
vCCcharge formula be C × Δ V=I × Δ T.Because be constant current source charging, therefore electric capacity C
vCCthe change of upper voltage is with duration of charging linear change, and when I × Δ T fixes, the C of different capabilities can produce different voltage Δ V, just can set the output parameters such as corresponding output current by detecting Δ V.Chip has one section of process from starting between normal work, and constant current source has input to be among this section of process just, namely after chip enable, a period of time constant current source starts there is input, and constant current source is decoupling capacitor charge to the second predeterminated voltage after, chip is just started working.
The work schedule schematic diagram that Fig. 7 is the detection module of structure shown in Fig. 6.Wherein, t0_x represents the charging starting point of different electric capacity Cx, and namely t0_1 represents the charging starting point of electric capacity C1, and t0_2 represents the charging starting point of electric capacity C2, and t0_3 represents the charging starting point of electric capacity C3.Detect when the voltage of decoupling capacitor reaches UVLOOFF (i.e. the first predeterminated voltage) voltage risen in Δ T time and corresponding output parameter is set.Export when VCC voltage rise starts life's work to chip time UVLOON (i.e. the second predeterminated voltage).The setting of output parameter is only arranged once when chip enable, detect after chip enable work and circuit (namely detection module 520 and output parameter arrange the circuit that module 530 is formed) is set just no longer works, prevent the fluctuation of VCC voltage interference chip from working normally.When chip triggers that after certain protection, VCC voltage drops to UVLOOFF, VCC voltage can re-power, and now can reset an output parameter, the loss of configuration information before preventing.
See Fig. 8, described detection module 520 comprises: the second comparer 524, second comparer 525.The input end in the same way of described second comparer 524 is connected with the supply pin 420 of described chip 400, and reverse input end connects described first predeterminated voltage; When the voltage of described supply pin 420 reaches the first predeterminated voltage, described second comparer 524 exports the first comparison signal.The reverse input end of described 3rd comparer 525 is connected with the supply pin 420 of described chip 400, inputs the reference voltage that termination is greater than described first predeterminated voltage fixed value in the same way; When the voltage of described supply pin 420 reaches described reference voltage, described 3rd comparer 525 exports the second comparison signal.The time of reception difference of the first comparison signal and the second comparison signal is duration of charging variable quantity.The Parameters variation amount utilizing the detection module of structure shown in Fig. 8 to obtain is the duration of charging variable quantity of described decoupling capacitor.
The specific works process of the detection module of structure shown in Fig. 8 is: chip 400 at every turn when starting inner constant current source 511 hold C from high pressure Drain
vCCcharging, when VCC voltage reaches UVLOOFF, comparer OP1 exports high level in the t1 time, and internal current arranges circuit and starts working; When VCC voltage reaches UVLO+ Δ V, comparer OP2 is in t2 time output low level, and internal current arranges circuit and quits work.Due to C
vCCcapacity different, the mistiming of t2-t1 will be caused at VCC voltage during Δ V different from UVLOOFF to UVLO+, therefore internal circuit just can arrange different output parameters.The chip life's work when VCC voltage reaches UVLOON.Equally, output parameter arrange action only when starting action once, reset once when VCC is restarted.The work schedule schematic diagram that Fig. 9 is the detection module of structure shown in Fig. 8.
Described output parameter arranges module 530 and is connected with described detection module 520, utilizes the Parameters variation amount in charge characteristic to arrange the corresponding output parameter of described chip 400.Parameter in the charge characteristic of described decoupling capacitor 440 comprises the capacitance of decoupling capacitor, charging current, duration of charging, charging voltage.
If detection module 520 adopts the structure shown in Fig. 6 to detect, accordingly, described output parameter arranges module 530 and is connected with the output terminal of described voltage variety detection components 523, the charging voltage variable quantity different according to all corresponding acquisition one of the output signal of each voltage comparator in the described voltage variety detection components received, and utilize the charging voltage variable quantity in charge characteristic (i.e. Parameters variation amount) that the corresponding output parameter of described chip 400 is set.
If detection module 520 adopts the structure shown in Fig. 8 to detect, accordingly, described output parameter arranges module 520 and is connected respectively with the output terminal of the 3rd comparer 525 with the output terminal of described second comparer 524, the time of reception difference of more described first comparison signal and the second comparison signal obtains duration of charging variable quantity, and utilizes the duration of charging variable quantity in charge characteristic (i.e. Parameters variation amount) to arrange the corresponding output parameter of described chip 400.
In some applications, output current itself can regulate, and now the present invention just can adjust output over-voltage protection, and as shown in Figure 10, wherein R1 is current regulating resistance.
When the supply pin 420 of described chip 400 powers on or charges to the second predeterminated voltage, described chip 400 starts, and with the corresponding output parameter set for initial value is started working.The described system 500 not changing chip pin adjustment chip output parameter quits work when the supply pin 420 of described chip powers on or charges to the second predeterminated voltage; Described second predeterminated voltage is greater than described first predeterminated voltage.
The present invention obtains parametric variable by the capacity changing the decoupling capacitor of chip power pin, thus utilizes parametric variable to realize arranging flexibly the output parameter of chip and adjusting, and the range of application of chip is widened.In addition, the decoupling capacitor of the supply pin that the present invention only uses, input pin, grounding leg and supply pin is all the structure that existing chip all possesses, and the method and system of all adjustment chip output parameters of the present invention is applicable to all chips.The restriction that the present invention breaches chip pin type and number increases chip functions, extends the usable range of chip.
What the method and system not changing chip pin adjustment chip output parameter of the present invention changed can be output current; it can be output voltage; need the output parameter of adjustment when also can be the practical applications such as output protection voltage/current, be not only confined 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 range of control of chip voltage, and is not limited to the scope that the present embodiment enumerates.
Range of application of the present invention is not limited to the chip of 3 pins that the present embodiment is enumerated, and also comprises the chip possessing more multi-pipe pin.As long as but chip occurs needing to realize adjustment function the situation not having pin spare, be all suitable for the present invention.
Can realize in the buck configuration that the present invention not only enumerates at the present embodiment, also can realize in other topological structure.
In sum, the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. do not change a method for chip pin adjustment chip output parameter, it is characterized in that, the described method not changing chip pin adjustment chip output parameter comprises:
Namely, when described chip does not start before the supply pin of chip powers on, the constant current source be connected with the input pin of described chip is utilized to be that the decoupling capacitor of described supply pin charges;
When charging to the first predeterminated voltage, detect the charge characteristic of described decoupling capacitor; Parameter in the charge characteristic of described decoupling capacitor comprises the capacitance of decoupling capacitor, charging current, duration of charging, charging voltage;
Utilize the Parameters variation amount in charge characteristic that the corresponding output parameter of described chip is set;
Described constant current source continues as the charging of described decoupling capacitor.
2. the method not changing chip pin adjustment chip output parameter according to claim 1, is characterized in that, the described method not changing chip pin adjustment chip output parameter also comprises:
When charging to the second predeterminated voltage, described chip enable, and with the corresponding output parameter set for initial value is started working; Described second predeterminated voltage is greater than described first predeterminated voltage; Described constant current source continues as the charging of described decoupling capacitor.
3. the method not changing chip pin adjustment chip output parameter according to claim 2, is characterized in that, the described method not changing chip pin adjustment chip output parameter also comprises:
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, the Parameters variation amount in described charge characteristic is utilized to reset the corresponding output parameter of described chip; Described constant current source continues as the charging of described decoupling capacitor.
4. the method not changing chip pin adjustment chip output parameter according to claim 1, it is characterized in that, the charge characteristic of the described decoupling capacitor of described detection, a kind of specific implementation process utilizing the Parameters variation amount in charge characteristic to arrange the corresponding output parameter of described chip comprises:
Within the given duration of charging, detect the change of the charging voltage with described decoupling capacitor capacitance change, wherein, the charging current that described constant current source provides is changeless;
Utilize the variable quantity of described charging voltage that the corresponding output parameter of described chip is set.
5. the method not changing chip pin adjustment chip output parameter according to claim 1, it is characterized in that, the charge characteristic of the described decoupling capacitor of described detection, a kind of specific implementation process utilizing the Parameters variation amount in charge characteristic to arrange the corresponding output parameter of described chip comprises:
In fixing charging voltage variation range, detect the change in the duration of charging with described decoupling capacitor capacitance change, wherein, the charging current that described constant current source provides is changeless;
The corresponding output parameter of described chip is set with the variable quantity in described duration of charging.
6. the method not changing chip pin adjustment chip output parameter according to claim 1 to 5 any one, is characterized in that: described corresponding output parameter comprises output current, output voltage, overcurrent protection electric current or overvoltage protection voltage.
7. do not change a system for chip pin adjustment chip output parameter, it is characterized in that: the described system not changing chip pin adjustment chip output parameter is built in described chip, comprising:
Charging module, comprises a constant current source; One end of described constant current 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, when before the supply pin of chip powers on, namely described chip does not start, for the decoupling capacitor of the supply pin of described chip charges;
Detection module, is connected with the supply pin of described chip, when the voltage of described supply pin reaches the first predeterminated voltage, detects the charge characteristic of described decoupling capacitor; Parameter in the charge characteristic of described decoupling capacitor comprises the capacitance of decoupling capacitor, charging current, duration of charging, charging voltage;
Output parameter arranges module, is connected with described detection module, utilizes the Parameters variation amount in charge characteristic to arrange the corresponding output parameter of described chip.
8. the system not changing chip pin adjustment chip output parameter according to claim 7, it is characterized in that: when the supply pin of described chip powers on or charges to the second predeterminated voltage, described chip enable, and with the corresponding output parameter set for initial value is started working; The described system not changing chip pin adjustment chip output parameter quits work when the supply pin of described chip powers on or charge to the second predeterminated voltage; Described second predeterminated voltage is greater than described first predeterminated voltage.
9. the system not changing chip pin adjustment chip output parameter according to claim 7, it is characterized in that, described Parameters variation amount is the charging voltage variable quantity of described decoupling capacitor;
Described detection module comprises:
First comparer, input end is connected with the supply pin of described chip in the same way, and reverse input end connects described first predeterminated voltage, when the voltage of described supply pin reaches the first predeterminated voltage, output detections control signal;
Time controller, is connected with the first comparer respectively with the supply pin of described chip, starts the voltage signal of the supply pin exporting described chip in preset time period for subsequent detection under the triggering of described detection control signal;
Voltage variety detection components, is connected with described time controller, detects described voltage signal, obtains voltage variety; Described voltage variety detection components comprises at least 2 voltage comparators; The reverse input end of each voltage comparator all connects different reference voltages; The input end in the same way of each voltage comparator is all connected with the output terminal of described time controller; The output signal of each voltage comparator all represents different voltage varieties;
Described output parameter arranges module and is connected with the output terminal of described voltage variety detection components, receives the charging voltage variable quantity that all corresponding acquisition of output signal of each voltage comparator in described voltage variety detection components is different.
10. the system not changing chip pin adjustment chip output parameter according to claim 7, it is characterized in that, described Parameters variation amount is the duration of charging variable quantity of described decoupling capacitor;
Described detection module comprises:
Second comparer, input end is connected with the supply pin of described chip in the same way, and reverse input end connects described first predeterminated voltage, when the voltage of described supply pin reaches the first predeterminated voltage, exports the first comparison signal;
3rd comparer, reverse input end is connected with the supply pin of described chip, inputs the reference voltage that termination is greater than described first predeterminated voltage fixed value in the same way, when the voltage of described supply pin reaches described reference voltage, exports the second comparison signal;
Described output parameter arranges module and is connected respectively with the output terminal of the 3rd comparer with the output terminal of described second comparer, and the time of reception difference of more described first comparison signal and the second comparison signal obtains duration of charging variable quantity.
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