CN101093986B - Pulse width modulation (PDM) circuit, and PDM integrate circuit in use for the PDM circuit - Google Patents
Pulse width modulation (PDM) circuit, and PDM integrate circuit in use for the PDM circuit Download PDFInfo
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- CN101093986B CN101093986B CN200610093798A CN200610093798A CN101093986B CN 101093986 B CN101093986 B CN 101093986B CN 200610093798 A CN200610093798 A CN 200610093798A CN 200610093798 A CN200610093798 A CN 200610093798A CN 101093986 B CN101093986 B CN 101093986B
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Abstract
The disclosed pulse width modulation (PWM) integrate circuit (IC) can set internal parameters without need of additional pin. PWM IC includes at least following parts: a first comparison amplifier produces two outputs; two pins connected to the said two outputs electrically; being connected to at least one pin from the two pins electrically, one program setting up unit is in use for receiving signal from outside for setting up parameters in order to setup inner parameters of PWM IC. Outputs from two pins of PWM IC can be in use for controlling switches of up/low bridges in order to constitute PWM circuit to generate PWM signal.
Description
Technical field
The relevant a kind of pulse-width modulation circuit (PWM Circuit) of the present invention, be meant a kind of can the setting especially from the outside to circuit inside, but do not need additionally to increase pin count purpose pulse-width modulation circuit, and be used for the pulse-width modulation integrated circuit of pulse-width modulation circuit.
Background technology
Pulse-width modulation circuit structure of the prior art roughly as shown in Figure 1, wherein by comparison amplifier 10, the output voltage of output end vo is taken a sample, compensated the result of gained later on through compensating circuit 30 again through sample circuit 20, with a reference saw-tooth Bob, produce relatively output by this, to control the start of bridge switch (also claiming control switch) CTL_SW and following bridge switch (also claiming synchro switch) SYN_SW.In addition, output voltage V o is through after sample circuit 20 samplings, and also feedback compares with a reference voltage Vr usually, uses the positive input terminal of FEEDBACK CONTROL comparison amplifier 10, makes it more accurate.The function of circuit is, by the start of bridge switch up and down, and by inductor L, the duty ratio (dutycycle) of may command square wave that output end vo produces, but also its pulsewidth of Calipering modulation.It is required that this exports visual circuit design, (illustrates in a schematic way among the figure in order to control load U_Load or L_Load; Both needn't exist simultaneously).Because of the basis of pulse-width modulation circuit as known technology, so each element in the circuit is not elaborated at this.
In the foregoing circuit, the part that frame of broken lines 100 is included is incorporated within the integrated circuit usually, and the part beyond the frame of broken lines then adopts individual component (discrete device) to make.So in specification of the present invention, complete circuit is called " pulse-width modulation circuit ", and the part that will be incorporated within the integrated circuit is called " pulse-width modulation integrated circuit ", it constitutes the main part of pulse-width modulation circuit.The pulse-width modulation integrated circuit 100 that frame of broken lines included must be connected with external circuit elements by pin.As shown in the figure, for linking up with external circuit, comparison amplifier 10 needs at least six pin P1-P6 usually, comprising: provide the pin P1 of relatively high pressure from voltage source V s to comparing amplifier 10; Go up the pin P2 of bridge switch CTL_SW by comparison amplifier 10 output controls; From the node SW between bridge switch up and down, the acquisition voltage level is to provide the pin P3 of reference voltage position standard to amplifier 10 relatively; Pin P4 by bridge switch SYN_SW under the comparison amplifier 10 output controls; Receive the pin P5 of compensating circuit 30 output signals; And the pin P6 that receives feedback signal.
Except above pin; in the pulse-width modulation circuit, must avoid usually, produce excessive electric current (over current) in the position of node SW; therefore must design can detect and, internal circuit is carried out the mechanism that FEEDBACK CONTROL is protected according to the overcurrent situation at this place.In known pulse-width modulation circuit, the basic practice to this has two, one as shown in Figure 1, a fixed current source Ioc can be provided in integrated circuit 100 inside, and provide a resistance R 1 in integrated circuit 100 outsides, the resistance of this resistance R 1 can be decided by the overcurrent threshold value that the circuit user sets according to institute's desire, so can produce an appropriate magnitude of voltage (in other words at node Voc1 place, so-called " overcurrent threshold value ", in side circuit, be that form with magnitude of voltage compares), as shown in the figure, after its sign of the appropriate adjustment of this magnitude of voltage, the voltage ratio of process comparison amplifier 40 and node SW, can utilize its comparative result to produce over-current protection signal OCP, use the control internal circuit and carry out over-current protection, for example close some switch or the like.
The method that another known technology provides a kind of over-current protection as shown in Figure 2, wherein directly produce a reference voltage level Voc2 by internal circuit, and with the voltage at node SW place, through after the R2 pressure drop (similarly, the resistance of resistance R 2 can be decided by the overcurrent threshold value that the circuit user sets according to institute's desire), the positive input terminal of input comparison amplifier 50, Voc2 compares with reference voltage level. and the result relatively can produce an over-current protection signal OCP similarly, uses the control internal circuit and carries out over-current protection.
The shortcoming of above-mentioned known pulse-width modulation circuit is, for over-current protection is provided, must increase a pin P7 separately; And the design of integrated circuit at present, all to reduce the pin number for still, so the practice of known pulse-width modulation circuit is unsatisfactory.
Except that above-mentioned shortcoming, in above-mentioned known pulse-width modulation circuit, unless increase pin, otherwise and can't carry out the setting of any other form to circuit inside.
In view of this, the present invention is promptly at the deficiency of above-mentioned prior art, and proposing a kind ofly can additionally not increase the pin number, and the pulse-width modulation circuit and the pulse-width modulation integrated circuit that provide over-current protection to set or carry out other setting to circuit inside is provided.
Summary of the invention
First purpose of the present invention is providing a kind of pulse-width modulation circuit, and it can be set from the outside to circuit inside, but does not need additionally to increase the pin number.
Second purpose of the present invention is providing a kind of pulse-width modulation integrated circuit that is used for above-mentioned pulse-width modulation circuit.
In order to achieve the above object, in one of them embodiment of the present invention, provide a kind of pulse-width modulation circuit, wherein comprised at least: (1) is individual bridge switch and the following bridge switch gone up of one of electrical connection mutually, and node between the two can be for producing a voltage signal; (2) pulse-width modulation integrated circuits, have (2a) a plurality of pins, second pin of bridge switch under first pin that wherein comprises bridge switch in the control at least, control, and the 3rd pin of the node voltage signal between bridge switch and following bridge switch in reception; Reach (2b) first comparison amplifier, it produces first output and second output; Reach (2c) program setting unit, be electrically connected with one of aforementioned first or second pin, can be for receiving and the parameter setting signal that comes by it, to set the inner parameter of pulse-width modulation integrated circuit, wherein this program setting unit is electrically connected with first output of first comparison amplifier, and when normal manipulation mode, the program setting unit passes to first pin with first output of first comparison amplifier, and when the program setting pattern, the program setting unit receives the signal next by first pin; And (3) parameter setting unit that are electrically connected with first pin.
In addition, according to another embodiment of the invention, also provide a kind of pulse-width modulation circuit, wherein comprised at least: (1) is individual bridge switch and the following bridge switch gone up of one of electrical connection mutually, and node between the two can be for producing a voltage signal; (2) pulse-width modulation integrated circuits, have (2a) a plurality of pins, second pin of bridge switch under first pin that wherein comprises bridge switch in the control at least, control, and the 3rd pin of the node voltage signal between bridge switch and following bridge switch in reception; Reach (2b) first comparison amplifier, it produces first output and second output; Reach (2c) program setting unit, be electrically connected with aforementioned first and second pins, can be for receiving and the parameter setting signal that comes by one of them, to set the inner parameter of pulse-width modulation integrated circuit, wherein this program setting unit program setup unit is electrically connected with second output of this first comparison amplifier, when normal manipulation mode, the program setting unit passes to second pin with second output of first comparison amplifier, and when the program setting pattern, the program setting unit receives the signal next by second pin; And (3) parameter setting unit that are connected electrically between first and second pins.
Again, according to another embodiment of the invention, also provide a kind of pulse-width modulation integrated circuit, wherein comprised at least: (1) first comparison amplifier, this comparison amplifier produces two outputs; (2) two pins are electrically connected with above-mentioned two outputs respectively; And (3) program setting unit, at least be electrically connected with one of this two pin, can be for receiving by outside and next parameter setting signal, to set the inner parameter of pulse-width modulation integrated circuit, wherein when normal manipulation mode, the program setting unit passes to one of this corresponding two pin with one of this two output of first comparison amplifier, and when the program setting pattern, and the program setting unit receives the signal that come by one of this two pin.
Program setting unit described in the various embodiments described above, can between normal manipulation mode and program setting pattern, switch, in the former, the program setting unit is passed to the pin place with the signal of pulse-width modulation IC interior, and in the latter, the program setting unit receives by outside and next parameter setting signal.
In addition, the program setting unit described in the various embodiments described above can have a storage circuit, and after the parameter setting signal was stored, parameter setting was reached in output again.And before storing, can convert the analog parameter setting signal to digital signal earlier, store and use with facility.
Below will illustrate in detail, so that the effect that is easier to understand purpose of the present invention, technology contents, characteristics and is reached by specific embodiment.
Description of drawings
Fig. 1 is the schematic circuit diagram of the pulse-width modulation circuit of prior art.
Fig. 2 is the schematic circuit diagram of the another kind of pulse-width modulation circuit of prior art.
Fig. 3 is the schematic circuit diagram according to the pulse-width modulation circuit of the embodiment of the invention.
Fig. 4 is the schematic circuit diagram of pulse-width modulation circuit according to another embodiment of the present invention.
Fig. 5 is the schematic circuit diagram of the program setting unit among Fig. 3, Fig. 4.
Fig. 6 is the schematic circuit diagram of the pulse-width modulation circuit of further embodiment of this invention.
Fig. 7 and Fig. 8 are the schematic circuit diagram of the program setting unit among Fig. 6.
Symbol description among the figure:
A, B, C, SW node
The last bridge switch of CTL_SW
The EN enable signal
Ioc fixed current source
L_Load, the U_Load load
OCP over-current protection signal
The P1-P7 pin
R1, R2, Roc resistance
Bridge switch under the SYN_SW
The Vo output
Voc1, Voc2, Vr reference voltage
The Vs voltage source
10 comparison amplifiers
20 sample circuits
30 compensating circuits
40,50 comparison amplifiers
70,80 program setting unit
71,81U, 81L, 91U, the ternary driving gate of 91L
72,82,92 fixed current sources
73,83,93 analog-to-digital conversion circuits
74,84,94 storage circuits
75,85,95 D/A conversion circuits
76,86,96 comparison amplifiers
77,87,97 digital signals
100,200 pulse-width modulation integrated circuits
Embodiment
Please refer to Fig. 3, wherein the mode with schematic circuit diagram shows one of them embodiment of the present invention.As shown in the figure, in the pulse-width modulation integrated circuit 200 of present embodiment, include a program setting unit 70, be connected electrically between the below output and following bridge switch control pin P4 of comparison amplifier 10.(the physical circuit embodiment of this program setting unit 70 will consult Fig. 5 below and do further explanation; At this macroscopic view effect of this circuit only is described earlier.) program setting unit 70 has two operator schemes, one is the program setting pattern, another is a normal manipulation mode.In the program setting pattern, by this program setting unit 70, the overcurrent threshold value desired or other can be wanted the parameter set, be set within the integrated circuit 200.After setting finishes, program setting unit 70 can be transformed into normal manipulation mode, this moment, program setting unit 70 Calipering reverted to normal driving gate, and according to the output of comparison amplifier 10, control is bridge switch SYN_SW down.
Outside pulse-width modulation integrated circuit 200, the circuit user sets the overcurrent threshold value of being desired (or other parameter) by setting the resistance of resistance R oc.Yet, with the significant difference of known technology be that integrated circuit 200 does not need to provide an extra pin for this reason, but utilizes existing pin P4, reaches identical purpose.
Foregoing circuit embodiment also can change and is designed to as shown in Figure 4, wherein program setting unit 70 is changed top output place that is arranged in comparison amplifier 10, is electrically connected with last bridge switch control pin P2.Similarly, the circuit user sets overcurrent threshold value or other parameter desired by setting the resistance of resistance R oc.At this moment, circuit utilizes existing pin P2, reaches the purpose of setting the overcurrent threshold value.
The detailed circuit example of program setting unit 70 is asked for an interview Fig. 5.As shown in the figure, include a ternary driving gate 71 in the circuit; The output of comparison amplifier 10 (can be the below or the top output of comparison amplifier 10, visual range preface setup unit 70 is used in the embodiment of Fig. 3 or Fig. 4 and decides), export pin PIN to by this ternary driving gate 71, and pin PIN Calipering is the P4 of Fig. 3 or the P2 of Fig. 4.Ternary driving gate 71 receives the input of an enable signal EN, when enable signal EN is enabled status, program setting unit 70 is in normal manipulation mode, and this moment, ternary driving gate 71 allowed that the output of comparison amplifier 10 arrives pin PIN through ternary driving gate 71.As enable signal EN during for enabled status not, program setting unit 70 is in the program setting pattern, and this moment, the output of ternary driving gate 71 became quick condition, that is node A do not influence by ternary driving gate 71 will, and is controlled by the other parts of circuit.
When program setting unit 70 was in the program setting pattern, the working method of circuit was as follows.Fixed current source 72 provides a fixed current; Therefore electric current produces cross-pressure through the path ground connection of node A-pin PIN-resistance R oc on resistance R oc, the voltage at this that is node A place.
Shang the cross-pressure on the resistance R oc, Yuan Ze Calipering be used for the voltage ratio of node SW, to produce over-current protection signal person; But because under the circuit normal manipulation mode, the output that ternary driving gate 71 must be used for transmitting comparison amplifier 10, the voltage of node A is decided by the output of ternary driving gate 71 at this moment, therefore on circuit design, can not be with the voltage at node A place, the voltage ratio that is connected directly to comparison amplifier 76 and node SW, otherwise under normal manipulation mode; Calipering can lose the magnitude of voltage that is set by fixed current source 72 and resistance R oc. thus event, must be earlier with in the program setting pattern, node A place is stored by the magnitude of voltage that fixed current source 72 and resistance R oc set. the mode of stored voltage value, be familiar with present technique person from thinking and the multiple practice, for example directly store with analog form, or the like. in one of them preferred embodiment of the present invention, its storing mode as shown in the figure, earlier by an analog-to-digital conversion circuit 73, the voltage transitions at node A place is become digital value, again this digital value being stored among the storage circuit 74. storage circuit 74 receives same enable signal EN with ternary driving gate 71, as enable signal EN during for enabled status not, storage circuit 74 receives data input, but when enable signal EN is enabled status, storage circuit 74 Calipering breech locks are lived data, no longer accept the new data next by analog-to-digital conversion circuit 73. the digital values that store in the storage circuit 74, export a D/A conversion circuit 75 to, after it converts analog signal to, the positive input terminal of input comparison amplifier 76, with the voltage ratio of node SW, to produce over-current protection signal OCP.
Analog-to-digital conversion circuit 73 in the foregoing circuit and D/A conversion circuit 75 can be the simple conversion circuit that a bit is only arranged, and perhaps also can be the change-over circuits (N is an integer) of any N bit, and visual required precision designs appositely.Physical circuit execution mode as for change-over circuit can have the multiple practice, for example can be with reference to United States Patent (USP) the 7th, 042, No. 773, be an example wherein.
The present invention utilizes analog-to-digital conversion circuit 73 to convert digital value earlier to, come the voltage of storage node A by storage circuit 74 in the mode of store digital data again, compares with directly storing with analog form, and its advantage is that the data that stores is in time unlikely and lose.So not single, because the voltage of node A is through analog digital conversion, storage, digital-to-analogue conversion, the positive input terminal of ability input comparison amplifier 76, therefore, the cross-pressure on the resistance R oc might not need the voltage with input comparison amplifier 76 positive input terminals, become 1: 1 relation of equality, and can be ratio value arbitrarily, again by the conversion proportion between analog digital conversion and the digital-to-analogue conversion, be adjusted to desired magnitude of voltage.The advantage of this kind practice is, can make that the error of setting resistance R oc resistance is dwindled, elasticity becomes big; For example if the cross-pressure on the resistance R oc and the voltage of input comparison amplifier 76 positive input terminals become 2: 1 relation, the error permission when then setting resistance R oc resistance has just increased by one times.
Except that the above, compare with the prior art of Fig. 1, Fig. 2, the present invention more provides a unexistent function of prior art.The numerical data that storage circuit 74 is stored can be used for carrying out other purposes, for example, supposes that pulse-width modulation integrated circuit 200 has two or more mode of operations, then can use the numeral output 77 of storage circuit 74, decides mode of operation; That is to say that the user can pass through to set the resistance of resistance R oc, and set the mode of operation of integrated circuit.Perhaps, can certainly use this numeral output 77, come IC interior is carried out the program setting of other kind.And because analog-to-digital conversion circuit 73 can be designed to the change-over circuit of N bit, so the user can be undertaken 2 by setting the resistance of resistance R oc
NQuite complicated program setting function is reached in the setting of planting.This kind program setting mechanism can and be deposited with the machine-processed of icon set overcurrent threshold value, or individualism.In the situation of Yu Bingcun, for example, can make N=4, and use wherein preceding two tool sense bit to set the overcurrent threshold value, carry out other setting and use latter two more not have a meaning bit, or the like.In the situation of individualism, but then for example digits deleted analog conversion circuit 75 and comparison amplifier 76.At this moment, the resistance of resistance R oc, only be provided as the usefulness of program setting, and the overcurrent threshold value can be set then by other circuit, for example at the pin P2 and the P4 of pulse-width modulation integrated circuit 200, each connects a circuit as shown in the figure, and D/A conversion circuit in one of them circuit 75 and comparison amplifier 76 are omitted, and only is made for the usefulness of program setting, another circuit then is used for setting the overcurrent threshold value, or the like.
Please consult Fig. 6 again, this is an alternative embodiment of the invention.As shown in the figure, in this embodiment, be with in order to set the resistance R oc of overcurrent threshold value, be connected between pin P2 and the P4, its corresponding programs setup unit 80 is then asked for an interview Fig. 7 and Fig. 8.
Fig. 7 is described earlier, as shown in the figure, include two ternary driving gate 81U and 81L in the program setting unit 80, receive the output of comparison amplifier 10 tops and below respectively. in addition, the other parts of program setting unit 80, similar to program setting unit 70. when enable signal EN was enabled status, ternary driving gate 81U and 81L with the top and the below output of comparison amplifier 10, were passed to pin P2 and P4 respectively; As enable signal EN during for enabled status not, program setting unit 80 enters the program setting pattern, this moment, ternary driving gate 81U made its output in low level, ternary driving gate 81L then makes its output in quick condition, so electric current that fixed current source 82 is produced, the ground connection by the grounding path Gnd of the ternary driving gate 81U of Node B-pin P4-resistance R oc-pin P2-, therefore on resistance R oc, produce cross-pressure, the voltage at Node B place when this is the program setting pattern. this voltage is in the mode similar to program setting unit 70, through analog-to-digital conversion circuit 83, storage circuit 84, D/A conversion circuit 85, and the voltage ratio of input comparison amplifier 86 and node SW, to produce over-current protection signal OCP.
Be familiar with present technique person when can think easily and, the circuit of Fig. 7 is changed as shown in Figure 8, the circuit difference of this embodiment circuit and Fig. 7 is, as enable signal EN during for enabled status not, program setting unit 80 enters the program setting pattern, this moment, ternary driving gate 91U made its output in quick condition, ternary driving gate 91L then makes its output in low level, so electric current that fixed current source 92 is produced, the ground connection by the grounding path Gnd of the ternary driving gate 91L of node C-pin P2-resistance R oc-pin P4-, therefore on resistance R oc, produce cross-pressure, the voltage at node C place when this is the program setting pattern uses generation over-current protection signal OCP and can be provided with aforementioned similar manner.
Below at preferred embodiment the present invention is described, the above only is familiar with present technique person and is easy to understand within the present invention and holds for making, and is not to be used for limiting interest field of the present invention.For being familiar with present technique person, when can in spirit of the present invention, thinking immediately and various equivalence variation; For example, shown among each embodiment, with comparison amplifier 76,86,96 are arranged in the program setting unit, therefore can produce the over-current protection signal in inside, program setting unit, but certainly, also can be with comparison amplifier 76,86,96 are arranged in outside the program setting unit, make inside, program setting unit only produce the overcurrent threshold value, or only produce digital signal 77,78,79, or the like.In addition, be used for setting the mechanism of overcurrent threshold or other parameter, may not necessarily use resistance R oc, and can be the element that other can produce cross-pressure; Again, bridge switch can be integrated within the integrated circuit up and down, or the like.So all equalizations of doing according to notion of the present invention and spirit change or modify, and all should be included in the claim of the present invention.
Claims (29)
1. pulse-width modulation circuit comprises at least:
Go up bridge switch and a following bridge switch for one that is electrically connected mutually, node between the two can be for producing a voltage signal;
A pulse-width modulation integrated circuit has
(a) a plurality of pins wherein comprise first pin of bridge switch in the control at least, second pin of bridge switch under control, and the 3rd pin of the node voltage signal between bridge switch and following bridge switch in reception;
(b) first comparison amplifier, it produces first output and second output; And
(c) program setting unit, first pin of going up bridge switch with control is electrically connected, can be for receiving the signal next by first pin, to set the inner parameter of pulse-width modulation integrated circuit, wherein this program setting unit is electrically connected with first output of first comparison amplifier, and when normal manipulation mode, the program setting unit passes to first pin with first output of first comparison amplifier, and when the program setting pattern, the program setting unit receives the signal next by first pin; And
A parameter setting unit that is electrically connected with first pin.
2. pulse-width modulation circuit as claimed in claim 1, wherein the above-mentioned parameter setup unit is a resistance, and still comprises a fixed current source that is electrically connected with first pin in the pulse-width modulation integrated circuit.
3. pulse-width modulation circuit as claimed in claim 1, wherein this program setting unit comprises a ternary driving gate, the input of this ternary driving gate is electrically connected with first output of first comparison amplifier, the output of ternary driving gate is electrically connected with first pin, and ternary driving gate can be controlled by an activation signal, make its output transmit the signal that input receives, or make its output become quick condition.
4. pulse-width modulation circuit as claimed in claim 1, wherein this program setting unit pack contains a storage circuit, to store the signal next by first pin.
5. pulse-width modulation circuit as claimed in claim 4, wherein the signal that should be come by first pin after storing, is compared with the node voltage signal between last bridge switch and following bridge switch, produces the over-current protection signal according to its result.
6. pulse-width modulation circuit as claimed in claim 5, wherein the signal that should be come by first pin after elder generation converts thereof into digital signal through an analog-to-digital conversion circuit, is just stored by storage circuit; The signal that stores, convert thereof into analog signal through a D/A conversion circuit after, again with last bridge switch and following bridge switch between the node voltage signal compare.
7. pulse-width modulation circuit as claimed in claim 4, wherein the signal that should be come by first pin after elder generation converts thereof into digital signal through an analog-to-digital conversion circuit, is just stored by storage circuit; The signal that stores is with digital form output, to set the inner parameter of pulse-width modulation integrated circuit.
8. pulse-width modulation circuit comprises at least:
Go up bridge switch and a following bridge switch for one that is electrically connected mutually, node between the two can be for producing a voltage signal;
A pulse-width modulation integrated circuit has
(a) a plurality of pins wherein comprise first pin of bridge switch in the control at least, second pin of bridge switch under control, and the 3rd pin of the node voltage signal between bridge switch and following bridge switch in reception;
(b) first comparison amplifier, it produces first output and second output; And
(c) program setting unit, be electrically connected with second pin of bridge switch under the control, can be for receiving the signal next by second pin, to set the inner parameter of pulse-width modulation integrated circuit, wherein this program setting unit is electrically connected with second output of this first comparison amplifier, and when normal manipulation mode, the program setting unit passes to second pin with second output of first comparison amplifier, and when the program setting pattern, the program setting unit receives the signal next by second pin; And
A parameter setting unit that is electrically connected with second pin.
9. pulse-width modulation circuit as claimed in claim 8, wherein this parameter setting unit is a resistance, and still comprises a fixed current source that is electrically connected with second pin in the pulse-width modulation integrated circuit.
10. pulse-width modulation circuit as claimed in claim 8, wherein this program setting unit comprises a ternary driving gate, the input of this ternary driving gate is electrically connected with second output of first comparison amplifier, the output of ternary driving gate is electrically connected with second pin, and ternary driving gate can be controlled by an activation signal, make its output transmit the signal that input receives, or make its output become quick condition.
11. pulse-width modulation circuit as claimed in claim 8, wherein this program setting unit pack contains a storage circuit, to store the signal next by second pin.
12. pulse-width modulation circuit as claimed in claim 11, wherein the signal that should be come by second pin after storing, is compared with the node voltage signal between last bridge switch and following bridge switch, produces the over-current protection signal according to its result.
13. pulse-width modulation circuit as claimed in claim 12, wherein the signal that should be come by second pin after elder generation converts thereof into digital signal through an analog-to-digital conversion circuit, is just stored by storage circuit; The signal that stores, convert thereof into analog signal through a D/A conversion circuit after, again with last bridge switch and following bridge switch between the node voltage signal compare.
14. pulse-width modulation circuit as claimed in claim 11, wherein the signal that should be come by second pin after elder generation converts thereof into digital signal through an analog-to-digital conversion circuit, is just stored by storage circuit; The signal that stores is with digital form output, to set the inner parameter of pulse-width modulation integrated circuit.
15. a pulse-width modulation circuit comprises at least:
Individual bridge switch and the following bridge switch gone up of one of mutual electrical connection, node between the two can be for voltage signal of generation;
A pulse-width modulation integrated circuit has
(a) a plurality of pins wherein comprise first pin of bridge switch in the control at least, second pin of bridge switch under control, and the 3rd pin of the node voltage signal between bridge switch and following bridge switch in reception;
(b) first comparison amplifier, it produces first output and second output; And
(c) program setting unit, be electrically connected with first pin and second pin, can be for receiving by outside and next parameter setting signal, to set the inner parameter of pulse-width modulation integrated circuit, wherein this program setting unit is electrically connected with this two output of this first comparison amplifier, when normal manipulation mode, the program setting unit passes to first and second corresponding pin with this two output of first comparison amplifier, and when the program setting pattern, the program setting unit receives by outside and next parameter setting signal; And
A parameter setting unit that is connected electrically between first pin and second pin.
16. pulse-width modulation circuit as claimed in claim 15, wherein this parameter setting unit is a resistance, and still comprises a fixed current source that is electrically connected with first pin in the pulse-width modulation integrated circuit.
17. pulse-width modulation circuit as claimed in claim 15, wherein this parameter setting unit is a resistance, and still comprises a fixed current source that is electrically connected with second pin in the pulse-width modulation integrated circuit.
18. pulse-width modulation circuit as claimed in claim 15, wherein this program setting unit comprises two ternary driving gates, its input respectively with first comparison amplifier this two output one of be electrically connected, its output is electrically connected with first and second pins respectively, and these two ternary driving gates can be controlled by an activation signal, and between two kinds of patterns, switch: in first pattern, the output of described ternary driving gate transmits the received signal of its input; In second pattern, the output of one of them becomes quick condition, and the output of another ternary driving gate is positioned at low level.
19. pulse-width modulation circuit as claimed in claim 15, wherein this program setting unit pack contains a storage circuit, the parameter setting signal that comes to store the outside.
20. pulse-width modulation circuit as claimed in claim 19, wherein this parameter setting signal after storing, is compared with the node voltage signal between last bridge switch and following bridge switch, produces the over-current protection signal according to its result.
21. pulse-width modulation circuit as claimed in claim 20, wherein this parameter setting signal after elder generation converts thereof into digital signal through an analog-to-digital conversion circuit, is just stored by storage circuit; The signal that stores, convert thereof into analog signal through a D/A conversion circuit after, again with last bridge switch and following bridge switch between the node voltage signal compare.
22. pulse-width modulation circuit as claimed in claim 19, wherein this parameter setting signal after elder generation converts thereof into digital signal through an analog-to-digital conversion circuit, is just stored by storage circuit; The signal that stores is with digital form output, to set the inner parameter of pulse-width modulation integrated circuit.
23. a pulse-width modulation integrated circuit comprises at least:
One first comparison amplifier, this comparison amplifier produces two outputs;
Two pins are electrically connected with above-mentioned two outputs respectively; And
A program setting unit, at least be electrically connected with one of this two pin, can be for receiving by outside and next parameter setting signal, to set the inner parameter of pulse-width modulation integrated circuit, wherein when normal manipulation mode, the program setting unit passes to one of this corresponding two pin with one of this two output of first comparison amplifier, and when the program setting pattern, and the program setting unit receives the signal that come by one of this two pin.
24. pulse-width modulation integrated circuit as claimed in claim 23, wherein aforementioned program setting unit comprises a ternary driving gate, one of this two output of its input and first comparison amplifier is electrically connected, its output is electrically connected with one of aforementioned two pins, and should control by an activation signal by the three-state driving gate, and between two states, switch: in first state, the output of this three-state driving gate transmits the received signal of its input; In second state, its output becomes quick condition.
25. pulse-width modulation integrated circuit as claimed in claim 23, wherein aforementioned program setting unit comprises two ternary driving gates, its input respectively with first comparison amplifier this two output one of be electrically connected, its output is electrically connected with one of aforementioned two pins respectively, and these two ternary driving gates can be controlled by an activation signal, and between two states, switch: in first state, the output of described ternary driving gate transmits the received signal of its input; In second state, the output of one of them becomes quick condition, and the output of another ternary driving gate is positioned at low level.
26. pulse-width modulation integrated circuit as claimed in claim 23, wherein this program setting unit pack contains a storage circuit, the parameter setting signal that comes to store the outside.
27. pulse-width modulation integrated circuit as claimed in claim 26, wherein this parameter setting signal after storing, is compared with a voltage signal, produces the over-current protection signal according to its result.
28. pulse-width modulation integrated circuit as claimed in claim 27, wherein this parameter setting signal after elder generation converts thereof into digital signal through an analog-to-digital conversion circuit, is just stored by storage circuit; The signal that stores, convert thereof into analog signal through a D/A conversion circuit after, compare with this voltage signal again.
29. pulse-width modulation integrated circuit as claimed in claim 26, wherein this parameter setting signal after elder generation converts thereof into digital signal through an analog-to-digital conversion circuit, is just stored by storage circuit; The signal that stores is with digital form output, to set the inner parameter of pulse-width modulation integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610093798A CN101093986B (en) | 2006-06-19 | 2006-06-19 | Pulse width modulation (PDM) circuit, and PDM integrate circuit in use for the PDM circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610093798A CN101093986B (en) | 2006-06-19 | 2006-06-19 | Pulse width modulation (PDM) circuit, and PDM integrate circuit in use for the PDM circuit |
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| Publication Number | Publication Date |
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| CN101093986A CN101093986A (en) | 2007-12-26 |
| CN101093986B true CN101093986B (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610093798A Active CN101093986B (en) | 2006-06-19 | 2006-06-19 | Pulse width modulation (PDM) circuit, and PDM integrate circuit in use for the PDM circuit |
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| CN (1) | CN101093986B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237873B (en) * | 2010-05-05 | 2015-11-25 | 立锜科技股份有限公司 | The frequency setting circuit of integrated circuit and method |
| CN104836420B (en) * | 2014-02-10 | 2018-03-06 | 立锜科技股份有限公司 | Voltage conversion circuit, voltage conversion controller and parameter setting method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5075634A (en) * | 1990-11-23 | 1991-12-24 | Blade Technologies Inc. | Composite bridge amplifier |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5075634A (en) * | 1990-11-23 | 1991-12-24 | Blade Technologies Inc. | Composite bridge amplifier |
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| CN101093986A (en) | 2007-12-26 |
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