CN104932602A - Integrated circuit capable of setting multifunctional parameters and method for setting multifunctional parameters of the integrated circuit - Google Patents
Integrated circuit capable of setting multifunctional parameters and method for setting multifunctional parameters of the integrated circuit Download PDFInfo
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- CN104932602A CN104932602A CN201410104517.5A CN201410104517A CN104932602A CN 104932602 A CN104932602 A CN 104932602A CN 201410104517 A CN201410104517 A CN 201410104517A CN 104932602 A CN104932602 A CN 104932602A
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Abstract
The present invention provides an integrated circuit capable of setting multifunctional parameters and a method for setting the multifunctional parameters of the integrated circuit. The method herein comprises the following steps: providing the integrated circuit which includes a multifunctional pin and a switch unit; coupling the multifunctional pin to an external setting unit; executing a voltage sampling process to the external setting unit via a first operation process of the switch unit, and setting a first functional parameter based on the result of the voltage sampling process; setting a second functional parameter based on a second operation process of the switch unit.
Description
Technical field
The invention relates to a kind of power management integrated circuit, espespecially a kind of integrated circuit and multi function parameter establishing method thereof with multi function parameter setting.
Background technology
Fig. 1 is that (integrated circuit is called for short: IC) with the circuit diagram of external setting-up unit existing integrated circuit.Please refer to Fig. 1.Integrated circuit 10 comprises current mirror 12, amplifier 14, ON time generator 16 and resistance R
ton.Electric current I in current mirror 12
vinwith electric current I
tonratio be 1:K.External setting-up unit 20 comprises resistance R
vin1with resistance R
vin2.Resistance R
vin1with resistance R
vin2be connected to after series connection between reference voltage Vin and ground.
Existing integrated circuit 10 needs a special pin P_Vin to obtain the dividing potential drop information of reference voltage Vin, with as the benchmark calculating ON time.Be that reference voltage Vin is via resistance R at the magnitude of voltage of pin P_Vin
vin1with resistance R
vin2dividing ratios and the dividing potential drop information obtained.Amplifier 14 and the first resistance R
tonconvert dividing potential drop information to electric current I
vin.
Electric current I
toncan be expressed as: I
ton=K × I
vin.
Electric current I
vincan be expressed as: I
vin=(V
in× R
vin2/ (R
vin1+ R
vin2))/R
ton.
Electric current I
tonrelevant with reference voltage Vin, can I be expressed as
ton(Vin).
Fig. 2 is the circuit diagram of the ON time generator of Fig. 1.Please refer to Fig. 2.ON time generator 16 comprises interrupteur SW, capacitor C
tonand amplifier 18.Electric current I
tonto capacitor C
ton.Capacitor C
tonthe magnitude of voltage at two ends is capacitance voltage V
ton.Amplifier 18 is according to output voltage Vout and capacitance voltage V
tonproduce the ON time Ton of tool pulse wave form.
When electric pressure converter comprises integrated circuit 10, the operating frequency (Fsw, not shown) of electric pressure converter can by divider resistance ratio R
vin2/ (R
vin1+ R
vin2) set.
ON time T
on can be expressed as: Ton=(C
ton× Vout)/I
ton=(Vout/Vin) × (1/K) × (R
ton× C
ton)/[R
vin2/ (R
vin1+R
vin2)].
Operating frequency Fsw can be expressed as: Fsw=1/ (Ton × Vin/Vout)=K/ (R
ton× C
ton) × [R
vin2/ (R
vin1+ R
vin2)].
Fig. 3 and Fig. 4 is the circuit diagram of existing integrated circuit and external setting-up unit.Electric pressure converter also needs the setting of other functions usually.Refer to Fig. 3 and Fig. 4.Integrated circuit 30 or 40 carries out the position standard setting of overcurrent protection by pin P_Ioca or P_Iocb.Integrated circuit 30 comprises current source 32 and the circuit overcurrent protection 34 of electric current I oc in figure 3, and external setting-up unit comprises resistance Roc, and wherein voltage Voc can be expressed as Voc=Ioc × Roc.External setting-up unit comprises resistance Roca and resistance Rocb in the diagram, and resistance Roca and resistance Rocb is connected between reference voltage Vref and ground after connecting, and wherein voltage Voc can be expressed as Voc=Vref × Rocb/ (Roca+Rocb).
As can be seen here, along with the progress of electronic technology, the function of integrated circuit also gets more and more.But the pin count of integrated circuit is limited, therefore some integrated circuit cannot increase other function setting by limited pin.In addition, constantly increase pin, this can cause overall integrated circuit area and package area to become large, increases manufacturing cost.
Summary of the invention
In view of this, the present invention proposes a kind of integrated circuit and the multi function parameter establishing method thereof with multi function parameter setting, in order to solve the problem that prior art is addressed.
The invention provides a kind of integrated circuit with multi function parameter setting.Integrated circuit couples external setting-up unit.Integrated circuit comprises multifunctional pins, the first function Circuit tuning, the second function Circuit tuning and switch element.Multifunctional pins couples external setting-up unit.Second function Circuit tuning couples multifunctional pins.Switch element couples multifunctional pins and the first function Circuit tuning.Before integrated circuit externally produces starting-up signal, the first function Circuit tuning performs voltage sampling process, to set the first functional parameter according to the result of voltage sampling process by the first operational processes of switch element to outside setup unit.After integrated circuit produces starting-up signal, the second function Circuit tuning sets the second functional parameter by the second operational processes of switch element.
In one embodiment of this invention, the first function Circuit tuning comprises the first sampling and holding circuit, the second sampling and holding circuit and the first current source.Switch element comprises the first switch, second switch and the 3rd switch.The first end of the first switch couples multifunctional pins, and its second end couples the first sampling and holding circuit, and its control end is controlled by the first control signal.The first end of second switch couples multifunctional pins, and its second end couples the second sampling and holding circuit, and its control end is controlled by the second control signal.The first end of the 3rd switch couples multifunctional pins, and its second end couples the first current source, and its control end is controlled by the second control signal.When in the first operational processes, the first control signal and the second control signal are applied to switch element, the second control signal is the synchronous inversion signal of the first control signal.
In one embodiment of this invention, external setting-up unit comprises resistor network, and resistor network receives reference voltage and provides branch pressure voltage to multifunctional pins.
In one embodiment of this invention, the first function Circuit tuning also comprises computing circuit and the first function setting circuit.Computing circuit couples the first sampling and holding circuit and second samples and holding circuit.Computing circuit carries out computing, to produce the first signal according to the voltage relevant with the second sampling voltage with the first sampling voltage of voltage sampling process.First function setting circuit is in order to receive the first signal and to react on the first signal to set the first functional parameter.The wherein one being set as overcurrent protection setting and current balance type setting of the first functional parameter.
The present invention reintroduces a kind of multi function parameter establishing method, and it comprises the following steps: provide integrated circuit, and integrated circuit comprises multifunctional pins and switch element; Couple multifunctional pins in external setting-up unit; Before integrated circuit externally produces starting-up signal, by the first operational processes of switch element, voltage sampling process is performed to outside setup unit, set the first functional parameter according to the result of voltage sampling process according to this; And after integrated circuit produces starting-up signal, set the second functional parameter by the second operational processes of switch element.
In an one exemplary embodiment of the present invention, the step setting the first functional parameter according to voltage sampling process comprises: utilize the voltage relevant with the second sampling voltage with the first sampling voltage of voltage sampling process to carry out computing, to produce the first signal; And react on the first signal to set the first functional parameter.
The present invention reoffers a kind of integrated circuit with multi function parameter setting.Integrated circuit couples external setting-up unit, and external setting-up unit has the first setup parameter and the second setup parameter.Integrated circuit comprises multifunctional pins, switch element, the first function Circuit tuning and the second function Circuit tuning.Multifunctional pins couples external setting-up unit.Switch element couples multifunctional pins.First function Circuit tuning couples switch element.Second function Circuit tuning couples switch element.When execution first function setting program, the first function Circuit tuning utilizes the first operational processes of switch element, the first setup parameter and the second setup parameter to set the first functional parameter.When execution second function setting program, the second function Circuit tuning utilizes the second operational processes of switch element and the first setup parameter to set the second functional parameter.
In one embodiment of this invention, the first setup parameter is dividing ratios, and the second setup parameter is equivalent impedance dividing potential drop.
The present invention reoffers a kind of multi function parameter establishing method, and it comprises: provide integrated circuit, and integrated circuit comprises multifunctional pins and switch element; Couple multifunctional pins in external setting-up unit, external setting-up unit has the first setup parameter and the second setup parameter; When execution first function setting program, the first operational processes of switch element, the first setup parameter and the second setup parameter is utilized to set the first functional parameter; And when execution second function setting program, utilize the second operational processes of switch element and the first setup parameter to set the second functional parameter.
In one embodiment of this invention, the step setting the first functional parameter comprises: utilize the voltage relevant with the second sampling voltage with the first sampling voltage to carry out computing, to produce the first signal; And react on the first signal to set the first functional parameter.
The present invention reoffers a kind of integrated circuit with multi function parameter setting.Integrated circuit couples external setting-up unit.Integrated circuit comprises multifunctional pins, switch element, the first function Circuit tuning and the second function Circuit tuning.Multifunctional pins couples external setting-up unit.Switch element couples multifunctional pins.First function Circuit tuning couples switch element.Second function Circuit tuning couples switch element.When the first function Circuit tuning passes through the first operational processes of switch element, obtain the first sampling voltage and the second sampling voltage, first function Circuit tuning also produces the first signal according to the first sampling voltage and the second sampling voltage, and according to the first signal sets first functional parameter.When the second function Circuit tuning passes through the second operational processes of switch element, produce secondary signal, and set the second functional parameter according to secondary signal.
The present invention reoffers a kind of multi function parameter establishing method, and it comprises: provide integrated circuit, and integrated circuit comprises multifunctional pins and switch element; Couple multifunctional pins in external setting-up unit; By the first operational processes of switch element, voltage sampling process is performed to outside setup unit, set the first functional parameter according to the result of voltage sampling process according to this; And set the second functional parameter according to the second operational processes of switch element.
Based on above-mentioned, integrated circuit of the present invention and multi function parameter establishing method utilize dividing ratios and the equivalent impedance (such as: parallel resistance value) of external setting-up unit, make to realize several functions setting at same multifunctional pins, and effectively avoid the problem that integrated circuit area becomes large.On the other hand, compared to existing mode, the circuit area that integrated circuit of the present invention uses can be smaller, therefore can also reduce manufacturing cost.
It is to be understood that above-mentioned general description and following embodiment are only exemplary and illustrative, its can not limit the present invention for protection scope.
Accompanying drawing explanation
Accompanying drawing is below a part for instructions of the present invention, it illustrates embodiments of the invention, and accompanying drawing is used for principle of the present invention is described together with the description of instructions.
Fig. 1 is the circuit diagram of existing integrated circuit and external setting-up unit;
Fig. 2 is the circuit diagram of the ON time generator of Fig. 1;
Fig. 3 and Fig. 4 is the circuit diagram of existing integrated circuit and external setting-up unit;
Fig. 5 is the schematic diagram of the integrated circuit set according to the multi function parameter of one embodiment of the invention;
Fig. 6 is the time-state method of the integrated circuit of Fig. 5;
Fig. 7 is the detailed circuit diagram of the computing circuit of Fig. 5;
Fig. 8 is the process flow diagram of the multi function parameter establishing method of one embodiment of the invention.
Description of reference numerals:
10: integrated circuit;
12: current mirror;
14: amplifier;
16: ON time generator;
18: amplifier;
20: external setting-up unit;
30: integrated circuit;
32: current source;
34: circuit overcurrent protection;
50: integrated circuit;
510: the first function Circuit tunings;
512: the first functional units;
514: the first current sources;
516: the first sampling and holding circuits;
518: the second sampling and holding circuits;
520: the second function Circuit tunings;
522: computing circuit;
524: the first function setting circuit;
526: the first amplifiers;
528: the second function setting circuit;
530: switch element;
532: the first current mirrors;
534: the second current sources;
536: the three current sources;
538: logical circuit;
540: external setting-up unit;
710: the second amplifiers;
720: the three amplifiers;
730,740,750,760,770: current mirror;
C
ton: capacitor;
FP1: the first functional parameter;
FP2: the second functional parameter;
I
oc: electric current;
I
oCSET: first determines electric current;
I
ton: electric current (secondary signal);
I
vin: electric current;
K: multiplying power;
K
m1, K
m2, K
m3, K
m4, K
m5: multiplying power;
NB: node;
OC/TG: multifunctional pins;
POR: starting-up signal;
P_Ioca, P_Iocb: pin;
P_Vin: pin;
P1: the first control signal;
P2: the second control signal;
R
hold1: the second resistance;
R
hold2: the 3rd resistance;
R
Δ Hold: the 4th resistance;
R
oc: resistance;
R
oca: resistance;
Rocb: resistance;
R
ton: the first resistance;
R
vin1, R
vin2: resistance;
R1, R2: resistance;
ST1, ST2: state;
SW: switch;
SW1: the first switch;
SW2: second switch;
SW3: the three switch;
S801, S802, S803, S804: step;
Ton: ON time;
T0, t1, t2: time;
VDD: operating voltage;
V
hold1: first keeps voltage;
V
hold2: second keeps voltage;
Vin: reference voltage;
Voc: voltage;
Vout: output voltage;
Vref: reference voltage;
V
sample1: the first sampling voltage;
V
sample2: the second sampling voltage;
Vset: branch pressure voltage;
V
ton: capacitance voltage;
Δ I
hold: electric current;
Δ V: the first signal.
Embodiment
Now with detailed reference to embodiments of the invention, and the example of described embodiment is described in the accompanying drawings.In addition, in drawings and the embodiments use element/component that is identical or like numerals will to be used to represent identical or similar portions.
In following all embodiments, when element is regarded as " connection " or " coupling " to another element, it can be and directly connects or be coupled to another element, maybe may there is intervenient element.Term " circuit " can be expressed as at least one element or multiple element, or initiatively and/or the passive and element that is coupled in together to provide proper function.Term " signal " can be expressed as at least one electric current, voltage, load, temperature, data or other signals.
With detailed reference to embodiments of the invention, and the example of described embodiment is described in the accompanying drawings.In addition, in drawings and the embodiments, use the element/component of identical label to represent identical or similar portions.
Fig. 5 is the schematic diagram of the integrated circuit set according to the multi function parameter of one embodiment of the invention.Fig. 6 is the time-state method of the integrated circuit of Fig. 5.Please refer to Fig. 5 and Fig. 6.Integrated circuit 50 comprises multifunctional pins OC/TG, the first function Circuit tuning 510, second function Circuit tuning 520 and switch element 530.First function Circuit tuning 510 comprises the first functional unit 512 and the first current source 514.Multifunctional pins OC/TG couples external setting-up unit 540, switch element 530, first function Circuit tuning 510 and the second function Circuit tuning 520.External setting-up unit 540 comprises resistor network (such as resistance R1 and R2), and resistor network receives reference voltage Vin and provides branch pressure voltage Vset to multifunctional pins OC/TG.
In the present embodiment, although resistor network is resistance R1 resistance in series R2, resistor network also can the element such as serial or parallel connection electric capacity, and to form a resistance value, the resistor network of the present embodiment is not limited to above-mentioned form and can does other change.
In one embodiment of the invention, external setting-up unit 540 has the first setup parameter (such as: dividing ratios) and the second setup parameter (such as: equivalent impedance or parallel resistance value), by this, the integrated circuit 50 several functions setting parameter that the operation of switch element 530, the first setup parameter and the second setup parameter can be utilized to realize at same multifunctional pins.The explanation of relevant multi function parameter setting, please refer to following explanation.
For convenience of description, hypothesis integrated circuit 50 is applied in a power converter.
Time t0 in Fig. 6, power supply IC_P is supplied to integrated circuit 50.State ST1 represents that time t0 is 300 microseconds to the time span of time t1, state ST1, or changes time span value with actual design.At state ST1, integrated circuit 50 confirms that whether the power supply status of its inside is normal.When the power supply (such as operating voltage VDD) of integrated circuit 50 inside is normal, then integrated circuit 50 starts the beamhouse operation carrying out Power convert after timet, until the output voltage Vout measuring power supply changeover device at time t2 is 85%(or 90%) output voltage setting value.When output voltage is 85%(or 90%) output voltage setting value time, the control module (not shown) of integrated circuit 50 to outside sends starting-up signal POR, and to make power supply changeover device start normal work, and control module is also the some of power supply changeover device.
In one embodiment, integrated circuit 50 before time t 1, first function Circuit tuning 510 utilizes the first operational processes of switch element 530, the first setup parameter and the second setup parameter, set the first functional parameter, that is, the first function Circuit tuning 510 performs voltage sampling process by the first operational processes of switch element 530 to outside setup unit 540.Such as, the first voltage (being expressed as Vset1, not shown in Fig. 5) on the node NB of external setting-up unit 540 is carried out sampling and keep to operate (the first sampling voltage V
sample1, first keep voltage V
hold1).The step one of the first operational processes of switch element 530: conducting first interrupteur SW 1, disconnects second switch SW2 and the 3rd interrupteur SW 3.
Before time t 1, the first function Circuit tuning 510 also applies first by the step 2 of the first operational processes of switch element 530 to outside setup unit 540 and determines electric current I
oCSETand perform the sampling of the second voltage (being expressed as Vset2, not shown in Fig. 5) and keep operation (the second sampling voltage V
sample2, second keep voltage V
hold2).The step 2 of the first operational processes of switch element 530: disconnect the first interrupteur SW 1, conducting second switch SW2 and the 3rd interrupteur SW 3.First function Circuit tuning 510 keeps voltage V according to first
hold1voltage V is kept with second
hold2set the first functional parameter FP1, wherein first keeps voltage V
hold1voltage V is kept with second
hold2respectively with the first sampling voltage V
sample1with the second sampling voltage V
sample2relevant.In addition, the setting of the first functional parameter FP1 is relevant with the first signal delta V, and therefore the first signal delta V and first keeps voltage V
hold1voltage V is kept with second
hold2relevant.
Be state ST2 after timet, integrated circuit 50(now or power supply changeover device) allow output voltage Vout rise at time t1.Second function Circuit tuning 520 utilizes the second operational processes of switch element 530 and the first setup parameter to set the second functional parameter.Also namely, the second function Circuit tuning 520 sets the second functional parameter FP2 at state ST2 by the second operational processes of switch element 530, and wherein the setting of the second functional parameter FP2 is relevant with reference voltage Vin.Second operational processes of switch element 530: disconnect the first interrupteur SW 1, second switch SW2 and the 3rd interrupteur SW 3.
Second function Circuit tuning 520 comprises the first amplifier 526, first resistance R
ton, the second current source 534, the 3rd current source 536 and the second function setting circuit 528.The first input end of the first amplifier 526 couples multifunctional pins OC/TG, and its second input end couples its output terminal.First resistance R
tonfirst end couple the output terminal of the first amplifier 526, its second end ground connection.Second current source 534 couples the first resistance R
tonfirst end.Second current source 534 and the 3rd current source 536 form the first current mirror 532, wherein electric current I
vinwith electric current I
tonratio can be expressed as I
vin: I
ton=1:K
ton.Second function setting circuit 528 receives and reacts on the electric current I of the 3rd current source 536
tonto set the second functional parameter.In addition, the setting of the second functional parameter can set for ON time.
Specifically, the first function Circuit tuning 510 comprise first current source 514, first sample and holding circuit 516, second sample and holding circuit 518, computing circuit 522 and the first function setting circuit 524.Switch element 530 comprises the first interrupteur SW 1, second switch SW2 and the 3rd interrupteur SW 3.The first end of the first interrupteur SW 1 couples multifunctional pins OC/TG, and its second end couples the first sampling and holding circuit 516, and its control end is controlled by the first control signal P1.The first end of second switch SW2 couples multifunctional pins OC/TG, and its second end couples the second sampling and holding circuit 518, and its control end is controlled by the second control signal P2.The first end of the 3rd interrupteur SW 3 couples multifunctional pins OC/TG, and its second end couples the first current source 514, and its control end is controlled by the second control signal P2.
When the first control signal P1 in the state ST1 in the first operational processes and the second control signal P2 is applied to switch element 530, the second control signal P2 is the synchronous inversion signal of the first control signal P1.
In addition, integrated circuit 50 also can comprise logical circuit 538, in order to produce the first control signal P1 and the second control signal P2.
Computing circuit 522 couples the first sampling and holding circuit 516 and second samples and holding circuit 518, keeps voltage V by first
hold1voltage V is kept with second
hold2perform computing, such as subtraction operation, to produce the first signal delta V.First function setting circuit 524 is in order to receive the first signal delta V and to react on the first signal delta V to set the first functional parameter FP1.The wherein one that setting can set for overcurrent protection and current balance type sets of such as the first functional parameter FP1.
In step a period of time of the first operational processes of switch element 530, conducting first interrupteur SW 1, disconnects second switch SW2 and the 3rd interrupteur SW 3.Vin × R2/ (R1+R2)=Vin × K is expressed as with Vset1
vin2/ (K
vin1+ K
vin2), and the first sampling voltage V
sample1also Vset1 is equaled.First sampling and holding circuit 516 are by the first sampling voltage V
sample1export and become the first maintenance voltage V
hold1.
When the step 2 of the first operational processes of switch element 530, disconnect the first interrupteur SW 1, conducting second switch SW2 and the 3rd interrupteur SW 3.[Vin × R2/ (R1+R2)]+[I is expressed as with Vset2
oCSET× (R1 ║ R2)]=[Vin × K
vin2/ (K
vin1+ K
vin2)]+[I
oCSET× R
sET× ((K
vin1× K
vin2/ (K
vin1+ K
vin2)], and the second sampling voltage V
sample2also Vset2 is equaled.Second sampling and holding circuit 518 are by the second sampling voltage V
sample2export and become the second maintenance voltage VHold2.
When getting the first maintenance voltage V
hold1and second keeps voltage V
hold2afterwards, then via computing circuit 522 the first signal delta V can be produced.First signal delta V can be expressed as Δ V=V
hold2-V
hold1=I
oCSET× R
sET× [(K
vin1× K
vin2/ (K
vin1+ K
vin2)], wherein R1=K
vin1× R
sET, R2=K
vin2× R
sET.As shown in the above description, the resistance R1 of Fig. 5 and resistance R2 can be utilized to set required excess current level setting (over current level setting).
Fig. 7 is the detailed circuit diagram of the computing circuit of Fig. 5.Refer to Fig. 7.Computing circuit 522 comprises the second amplifier 710, the 3rd amplifier 720, second resistance R
hold1, the 3rd resistance R
hold2, the 4th resistance R Δ
holdand multiple current mirror 730,740,750,760 and 770.The first input end of the second amplifier 710 receives first and keeps voltage V
hold1, its second input end couples its output terminal.Second resistance R
hold1first end couple the output terminal of the second amplifier 710, its second end ground connection.The first input end of the 3rd amplifier 720 receives second and keeps voltage V
hold2, its second input end couples its output terminal.3rd resistance R
hold2first end couple the output terminal of the 3rd amplifier 720, its second end ground connection.Current mirror 730 couples the second amplifier 710, and current mirror 740 couples the 3rd amplifier 720, and current mirror 760 and 770 couples the 4th resistance R
Δ Hold, and export the 4th resistance R
Δ Holdthe voltage difference at two ends is with as the first signal delta V.
First keeps voltage V
hold1voltage V is kept with second
hold2via the second amplifier 710, the 3rd amplifier 720, second resistance R
hold1, the 3rd resistance R
hold2negative feedback change out electric current I
hold1and electric current I
hold2, wherein electric current I
hold1i can be expressed as
hold1=V
hold1/ R
hold1, electric current I
hold2i can be expressed as
hold2=V
hold2/ R
hold2.Electric current I
hold1k is amplified again via the mirror of current mirror 730,750
m1× K
m3doubly.Electric current I
hold2k is amplified again via the mirror of current mirror 740
m2doubly.By electric current K
m2× I
hold2with electric current K
m1× K
m3× I
hold2subtract each other and obtain electric current Δ I
hold.Electric current Δ I
holdthrough current mirror 760,770 mirror and amplify K
m4× K
m5doubly, electric current K
m4× K
m5× Δ I
holdflow through resistance R
Δ Holdproduce the first signal delta V.
If K
m1=K
m2=K
m3=K
m4=K
m5=1 and R
hold1=R
hold2=R
Δ Hold, then Δ V=V
hold2-V
hold1=I
oCSET× R
sET× [(K
vin1× K
vin2/ (K
vin1+ K
vin2)].In addition, the computing circuit of the present embodiment is not limited to above-mentioned form and can does other change.
Referring again to Fig. 5 and Fig. 6, during time t1, obtain the first signal delta V at the time t0 of state 1.State ST2 after time t1, disconnect the first interrupteur SW 1, second switch SW2 and the 3rd interrupteur SW 3, branch pressure voltage Vset can be expressed as Vset=Vin × R2/ (R1+R2)=Vin × K
vin2/ (K
vin1+ K
vin2), branch pressure voltage Vset is via the negative feedback of the first amplifier 526 and the first resistance R
tonproduce electric current I
vin.Second function setting circuit 528 can according to electric current I
vinset the second functional parameter FP2 not shown to produce operating frequency Fsw().Calculating about operating frequency Fsw can utilize the operating frequency of existing derivation and learn, so do not repeat them here.So operating frequency Fsw can be expressed as Fsw=[K
ton/ (R
ton× C
ton)] × [K
vin2/ (K
vin1+ K
vin2)].Therefore, the dividing ratios of resistance R1 and R2 can be utilized obtain the information about reference voltage Vin by multifunctional pins OC/TG, according to this operating frequency Fsw of setting needed for power supply changeover device.
It is worth mentioning that, at different conditions, the first signal delta V and electric current I
ton(secondary signal) can be transferred into the first function setting circuit 524 and the second function setting circuit 528 respectively.The form of the first function setting circuit 524 and the second function setting circuit 528 can be used to set as overcurrent protection, current balance type, ON time, analog/digital conversion, output voltage offset or attenuation function.Therefore, integrated circuit 50 can realize several functions setting at same multifunctional pins OC/TG.
Based on the content disclosed in above-described embodiment, can converge whole go out a kind of general multi function parameter establishing method.Clearer, Fig. 8 is the process flow diagram of the multi function parameter establishing method of one embodiment of the invention.Please refer to Fig. 5, Fig. 6 and Fig. 8, the multi function parameter establishing method of the present embodiment can comprise the following steps.
As shown in step S801, provide integrated circuit 50, and integrated circuit 50 comprises multifunctional pins OC/TG and switch element 530.
Then carry out step S802, couple multifunctional pins OC/TG in external setting-up unit 540.External setting-up unit 540 has the first setup parameter (such as: dividing ratios) and the second setup parameter (such as: equivalent impedance or parallel resistance value).
Then, as shown in step S803, by the first operational processes of switch element 530, voltage sampling process is performed to outside setup unit 540, set the first functional parameter FP1 according to the result of voltage sampling process according to this.Such as one, when execution first function setting program, obtain the first sampling voltage V by the first operational processes of switch element 530, the first setup parameter and the second setup parameter
sample1with the second sampling voltage V
sample2, according to this according to the first sampling voltage V
sample1with the second sampling voltage V
sample2set the first functional parameter FP1.Such as two, not yet need Vin correlated current source to before control Vout voltage rise at integrated circuit 50, namely before time t1, by the first operational processes of switch element 530, voltage sampling process is performed to outside setup unit 540, set the first functional parameter FP1 according to the result (the first signal delta V) of voltage sampling process according to this.
Then, as shown in step S804, the second functional parameter FP2 is set according to the second operational processes of switch element 530.Such as one, when execution second function setting program, set the second functional parameter FP2 according to the second operational processes of switch element 530.Such as two, after integrated circuit 50 produces starting-up signal, when starting to need to utilize Vin correlated current source to control Vout voltage rise, set the second functional parameter FP2 by second operational processes (disconnecting the first interrupteur SW 1, second switch SW2 and the 3rd interrupteur SW 3) of switch element 530.
In addition, the step S803 setting the first functional parameter FP1 according to voltage sampling process can comprise: utilize the first sampling voltage V with voltage sampling process
sample1with the second sampling voltage V
sample2(also namely, first keeps voltage V to relevant voltage
hold1voltage V is kept with second
hold2) carry out computing, such as, keep voltage V by first
hold1voltage V is kept with second
hold2perform subtraction operation to produce the first signal delta V; And react on the first signal delta V to set the first functional parameter FP1.
In sum, the integrated circuit of the embodiment of the present invention and multi function parameter establishing method utilize dividing ratios and the equivalent impedance (such as: parallel resistance value) of external setting-up unit, make to realize several functions setting at same multifunctional pins, and effectively avoid the problem that integrated circuit area becomes large.On the other hand, compared to existing mode, the circuit area that integrated circuit of the present invention uses can be smaller, therefore can also reduce manufacturing cost.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (17)
1. have an integrated circuit for multi function parameter setting, it is characterized in that, couple an external setting-up unit, described integrated circuit comprises:
One multifunctional pins, couples described external setting-up unit;
One first function Circuit tuning;
One second function Circuit tuning, couples described multifunctional pins; And
One switch element, couples described multifunctional pins and described first function Circuit tuning;
Wherein before described integrated circuit externally produces a starting-up signal, described first function Circuit tuning performs a voltage sampling process by one first operational processes of described switch element to described external setting-up unit, with result setting one first functional parameter according to described voltage sampling process;
Wherein after described integrated circuit produces described starting-up signal, described second function Circuit tuning sets one second functional parameter by the state of one second operational processes of described switch element.
2. integrated circuit according to claim 1, is characterized in that, described first function Circuit tuning comprises one first sampling and holding circuit, one second sampling and holding circuit and one first current source, and described switch element comprises:
One first switch, its first end couples described multifunctional pins, and its second end couples described first sampling and holding circuit, and its control end is controlled by one first control signal;
One second switch, its first end couples described multifunctional pins, and its second end couples described second sampling and holding circuit, and its control end is controlled by one second control signal; And
One the 3rd switch, its first end couples described multifunctional pins, and its second end couples described first current source, and its control end is controlled by described second control signal;
Wherein when being applied to described switch element in the first control signal described in described first operational processes and described second control signal, described second control signal is the synchronous inversion signal of described first control signal.
3. integrated circuit according to claim 1, is characterized in that, described external setting-up unit comprises a resistor network, and described resistor network receives a reference voltage and provides a branch pressure voltage to described multifunctional pins.
4. integrated circuit according to claim 2, is characterized in that, described first function Circuit tuning also comprises:
One computing circuit, couple described first sampling and holding circuit and described second sampling and holding circuit, described computing circuit carries out a computing, to produce one first signal according to the voltage relevant with one second sampling voltage with one first sampling voltage of described voltage sampling process; And
One first function setting circuit, in order to receive described first signal and to react on described first signal to set described first functional parameter.
5. a multi function parameter establishing method, is characterized in that, comprising:
There is provided an integrated circuit, described integrated circuit comprises a multifunctional pins and a switch element;
Couple described multifunctional pins in an external setting-up unit;
Before described integrated circuit externally produces a starting-up signal, by one first operational processes of described switch element, one voltage sampling process is performed to described external setting-up unit, according to this according to result setting one first functional parameter of described voltage sampling process; And
After described integrated circuit produces described starting-up signal, set one second functional parameter by one second operational processes of described switch element.
6. multi function parameter establishing method according to claim 5, is characterized in that, the step according to described first functional parameter of described voltage sampling process setting comprises:
The voltage relevant with one second sampling voltage with one first sampling voltage of described voltage sampling process is utilized to carry out a computing, to produce one first signal; And
React on described first signal to set described first functional parameter.
7. have an integrated circuit for multi function parameter setting, it is characterized in that, couple an external setting-up unit, described external setting-up unit has one first setup parameter and one second setup parameter, and described integrated circuit comprises:
One multifunctional pins, couples described external setting-up unit;
One switch element, couples described multifunctional pins;
One first function Circuit tuning, couples described switch element; And
One second function Circuit tuning, couples described switch element;
Wherein when execution one first function setting program, described first function Circuit tuning utilizes one first operational processes of described switch element, described first setup parameter and described second setup parameter, sets one first functional parameter;
Wherein when execution one second function setting program, described second function Circuit tuning utilizes one second operational processes of described switch element and described first setup parameter to set one second functional parameter.
8. integrated circuit according to claim 7, is characterized in that, described first function Circuit tuning comprises one first sampling and holding circuit, one second sampling and holding circuit and one first current source, and described switch element comprises:
One first switch, its first end couples described multifunctional pins, and its second end couples described first sampling and holding circuit, and its control end is controlled by one first control signal;
One second switch, its first end couples described multifunctional pins, and its second end couples described second sampling and holding circuit, and its control end is controlled by one second control signal; And
One the 3rd switch, its first end couples described multifunctional pins, and its second end couples described first current source, and its control end is controlled by described second control signal;
Wherein when being applied to described switch element in the first control signal described in described first operational processes and described second control signal, described second control signal is the synchronous inversion signal of described first control signal.
9. integrated circuit according to claim 7, is characterized in that, described first setup parameter is a dividing ratios, and described second setup parameter is an equivalent impedance dividing potential drop.
10. a multi function parameter establishing method, is characterized in that, comprising:
There is provided an integrated circuit, described integrated circuit comprises a multifunctional pins and a switch element;
Couple described multifunctional pins in an external setting-up unit, wherein said external setting-up unit has one first setup parameter and one second setup parameter;
When execution one first function setting program, one first operational processes of described switch element, described first setup parameter and described second setup parameter is utilized to set one first functional parameter; And
When execution one second function setting program, one second operational processes of described switch element and described first setup parameter is utilized to set one second functional parameter.
11. multi function parameter establishing methods according to claim 10, is characterized in that, the step setting described first functional parameter comprises:
The voltage relevant with one second sampling voltage with one first sampling voltage is utilized to carry out a computing, to produce one first signal; And
React on described first signal to set described first functional parameter.
12. multi function parameter establishing methods according to claim 10, is characterized in that, described first setup parameter is a dividing ratios, and described second setup parameter is an equivalent impedance dividing potential drop.
13. 1 kinds of integrated circuit that there is multi function parameter and set, it is characterized in that, couple an external setting-up unit, described integrated circuit comprises:
One multifunctional pins, couples described external setting-up unit;
One switch element, couples described multifunctional pins;
One first function Circuit tuning, couples described switch element; And
One second function Circuit tuning, couples described switch element;
Wherein when first operational processes of described first function Circuit tuning by described switch element, obtain one first sampling voltage and one second sampling voltage, described first function Circuit tuning also produces one first signal according to described first sampling voltage and described second sampling voltage, and according to described first signal sets one first functional parameter;
Wherein when second operational processes of described second function Circuit tuning by described switch element, produce a secondary signal, and according to described secondary signal setting one second functional parameter.
14. integrated circuit according to claim 13, is characterized in that, described first function Circuit tuning comprises one first sampling and holding circuit, one second sampling and holding circuit and one first current source, and described switch element comprises:
One first switch, its first end couples described multifunctional pins, and its second end couples described first sampling and holding circuit, and its control end is controlled by one first control signal;
One second switch, its first end couples described multifunctional pins, and its second end couples described second sampling and holding circuit, and its control end is controlled by one second control signal; And
One the 3rd switch, its first end couples described multifunctional pins, and its second end couples described first current source, and its control end is controlled by described second control signal;
Wherein when being applied to described switch element in the first control signal described in described first operational processes and described second control signal, described second control signal is the synchronous inversion signal of described first control signal.
15. integrated circuit according to claim 13, is characterized in that, described first function Circuit tuning also comprises:
One computing circuit, couples described first sampling and holding circuit and described second samples and holding circuit, and described computing circuit carries out a computing, to produce one first signal according to the voltage relevant with described second sampling voltage with described first sampling voltage; And
One first function setting circuit, in order to receive described first signal and to react on described first signal to set described first functional parameter.
16. 1 kinds of multi function parameter establishing methods, is characterized in that, comprising:
There is provided an integrated circuit, described integrated circuit comprises a multifunctional pins and a switch element;
Couple described multifunctional pins in an external setting-up unit;
By one first operational processes of described switch element, one voltage sampling process is performed to described external setting-up unit, according to this according to result setting one first functional parameter of described voltage sampling process; And
One second operational processes according to described switch element sets one second functional parameter.
17. multi function parameter establishing methods according to claim 16, is characterized in that, the step according to described first functional parameter of described voltage sampling process setting comprises:
The voltage relevant with one second sampling voltage with one first sampling voltage is utilized to carry out a computing, to produce one first signal; And
React on described first signal to set described first functional parameter.
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