CN203840199U - Monolithic integrated switch converter and soft start circuit thereof - Google Patents
Monolithic integrated switch converter and soft start circuit thereof Download PDFInfo
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- CN203840199U CN203840199U CN201420227640.1U CN201420227640U CN203840199U CN 203840199 U CN203840199 U CN 203840199U CN 201420227640 U CN201420227640 U CN 201420227640U CN 203840199 U CN203840199 U CN 203840199U
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Abstract
A monolithic integrated switching converter and a soft start circuit thereof are disclosed. The soft start circuit includes: an on-chip soft-start voltage generating circuit for providing an on-chip soft-start voltage; the first input end of the operational amplification circuit receives on-chip soft start voltage, the second input end of the operational amplification circuit receives a soft start reference signal or a feedback signal representing the soft start reference signal, and the output end of the operational amplification circuit, which is used as a pin of the integrated circuit, can be coupled with an external soft start capacitor; the buffer circuit is coupled to the output end of the operational amplification circuit and provides a soft start reference signal; when the output end of the operational amplification circuit is coupled with the external soft start capacitor, the operational amplification circuit charges the external soft start capacitor to provide off-chip soft start voltage, and the soft start circuit provides a soft start reference signal based on the on-chip soft start voltage and the off-chip soft start voltage, so that external soft start or internal soft start can be flexibly configured.
Description
Technical field
Embodiment of the present utility model relates to electronic circuit, relates in particular to monolithic integrated switch converter and the soft circuit that opens thereof.
Background technology
In recent years, along with the continuous growth of portable type electronic product in the fields such as communication, computer and consumer electronics, monolithic integrated switch converter is because it has that efficiency is high, transient response speed is fast and volume is little etc. that advantage obtains a wide range of applications.And typical switch converters is in start-up course, easily produce surge current and cause output voltage overshoot, may damage switching tube and other devices, therefore need the soft circuit that opens.
In order to realize soft the opening of output of switch converters, conventionally obtain the soft reference signal that opens to rise on slope to the soft capacitor charging that opens by a current source, startup stage switch converters output follow and softly open reference signal rising, thereby reach the soft object opening.Because the soft electric capacity that opens needs larger capacitance, be unfavorable for that integrated, traditional way is that the soft electric capacity that opens is placed in outside chip, by built-in current source, it is charged, but this way has increased area and the application cost of circuit.Another kind of way is by the soft circuit that opens on specialized designs sheet, the soft capacitance that opens electric capacity needing is reduced, thereby the soft electric capacity that opens is integrated on chip, fixes but the shortcoming of this way is the soft duration opening, and lacks flexibility.
Utility model content
For one or more problems of the prior art, an object of the present utility model is to provide a kind of monolithic integrated switch converter and the soft circuit that opens thereof.
According to the soft circuit that opens of the one of the utility model embodiment, for monolithic integrated switch converter, the described soft circuit that opens comprises: the soft voltage generation circuit that opens on sheet, provides the soft voltage that opens on sheet at its output; Operational amplification circuit, there is first input end, the second input and output, wherein first input end is coupled on sheet the soft output that opens voltage generation circuit with the soft voltage that opens on receiving sheet, the second input receives and softly opens reference signal or represent the soft feedback signal that opens reference signal, and output can couple the external soft electric capacity that opens as a pin of integrated circuit; And buffer circuit, there is input and output, wherein input is coupled to the output of operational amplification circuit, and output provides the soft reference signal that opens; Wherein, when the output of operational amplification circuit does not couple external softly while opening electric capacity, the soft circuit that opens provides the soft reference signal that opens based on the soft voltage that opens on sheet; And couple external softly while opening electric capacity when the output of operational amplification circuit, and operational amplification circuit is to the external soft capacitor charging that opens to provide sheet the outer soft voltage that opens, and the soft circuit that opens opens voltage and the outer soft voltage that opens of sheet provides the soft reference signal that opens based on soft on sheet.
In one embodiment, when the output of operational amplification circuit couples external softly while opening electric capacity, operational amplification circuit opens voltage and the outer soft voltage that opens of sheet is adjusted automatically to the external soft size of current that opens capacitor charging according to soft on sheet.
In one embodiment, on sheet, the soft circuit that opens also comprises: the first current source, provides charging current; And the soft electric capacity that opens on sheet, be coupled to the first current source, the first current source with charging current to the soft capacitor charging that opens on sheet to obtain the soft voltage that opens on sheet.
In one embodiment, on sheet, the soft circuit that opens also comprises: the first current source, provides charging current; The second current source, provides discharging current; And the soft electric capacity that opens on sheet, be coupled to the first current source by the first switch, be coupled to the second current source by second switch; Wherein when the signal of having the hiccups is during in the first state, the first switch conduction, second switch turn-offs, and the charging current that the first current source provides is to the soft capacitor charging that opens on sheet; And when the signal of having the hiccups is during in the second state, second switch conducting, the first switch turn-offs, and the discharging current that the second current source provides is to the soft capacitor discharge that opens on sheet.
In one embodiment, the described soft circuit that opens also comprises: biasing circuit, provide bias current at its output, described bias current by operational amplification circuit to the external soft capacitor charging that opens; Wherein the external soft electric current that opens capacitor charging is not more than to bias current.
In one embodiment, operational amplification circuit comprises: Differential input circuit, comprise the first P-channel field-effect transistor (PEFT) pipe and the second P-channel field-effect transistor (PEFT) pipe, wherein the grid of the first P-channel field-effect transistor (PEFT) pipe is coupled to the soft output that opens voltage generation circuit on sheet, the grid of the second P-channel field-effect transistor (PEFT) pipe is coupled to the output of buffer circuit, and the source electrode of the first P-channel field-effect transistor (PEFT) pipe and the second P-channel field-effect transistor (PEFT) pipe is coupled to the output of biasing circuit; The first transistor pair, comprise a N channel field-effect pipe and the 2nd N channel field-effect pipe, wherein the grid of the grid of a N channel field-effect pipe and drain electrode and the 2nd N channel field-effect pipe is coupled to the drain electrode of the first P-channel field-effect transistor (PEFT) pipe jointly, the source electrode of the one N channel field-effect pipe and the 2nd N channel field-effect pipe is coupled to systematically, and the drain electrode of the 2nd N channel field-effect pipe is coupled to the output of operational amplification circuit; Transistor seconds pair, comprise the 3rd N channel field-effect pipe and the 4th N channel field-effect pipe, wherein the grid of the grid of the 3rd N channel field-effect pipe and drain electrode and the 4th N channel field-effect pipe is coupled to the drain electrode of the second P-channel field-effect transistor (PEFT) pipe jointly, and the source electrode of the source electrode of the 3rd N channel field-effect pipe and the 4th N channel field-effect pipe is coupled to systematically; And the 3rd transistor pair, comprise the 3rd P-channel field-effect transistor (PEFT) pipe and the 4th P-channel field-effect transistor (PEFT) pipe, wherein the grid of the grid of the 3rd P-channel field-effect transistor (PEFT) pipe and drain electrode and the 4th P-channel field-effect transistor (PEFT) pipe is coupled to the drain electrode of the 4th N channel field-effect pipe, the source electrode of the 3rd P-channel field-effect transistor (PEFT) pipe and the 4th P-channel field-effect transistor (PEFT) pipe is coupled to auxiliary power supply voltage, and the drain electrode of the 4th P-channel field-effect transistor (PEFT) pipe is coupled to the drain electrode of the 2nd N channel field-effect pipe and the output of operational amplification circuit.
In one embodiment, buffer circuit also comprises: the 5th N channel field-effect pipe, wherein the grid of the 5th N channel field-effect pipe is coupled to the output of operational amplification circuit, the drain electrode of the 5th N channel field-effect pipe is coupled to auxiliary power supply voltage, and the source electrode of the 5th N channel field-effect pipe is as the output of buffer circuit.
In one embodiment, the described soft also clamp circuit of circuit that opens, described clamp circuit comprises: the 3rd current source, there is first end and the second end, wherein first end is coupled to auxiliary power supply voltage; The first clamp switch, has first end, the second end and control end, and wherein control end is coupled to the second end of the 3rd current source, and first end is coupled to the output of operational amplification circuit, and the second end is coupled to auxiliary power supply voltage; And second clamp switch, there is first end, the second end and control end, wherein control end is coupled to the output of operational amplification circuit, and first end is coupled to systematically, and the second end is coupled to the second end of the 3rd current source; Wherein, in the time that monolithic integrated switch converter starts to start, the voltage of operational amplification circuit output increases to open buffer circuit under the effect of described clamp circuit.
According to a kind of monolithic integrated switch converter of the utility model embodiment, comprise error amplifying circuit, receive and softly open reference signal, export reference signal and represent the feedback signal of output voltage, wherein when the soft reference signal that opens is less than output when reference signal, error amplifying circuit is according to the soft difference output error signal opening between reference signal and feedback signal, and being greater than output when reference signal when the soft reference signal that opens, error amplifying circuit is according to the difference output error signal between output reference signal and feedback signal; Slope circuit for generating, provides ramp signal; Logical circuit, is coupled to error amplifying circuit and slope circuit for generating to receive error signal and ramp signal, and produces switch controlling signal based on error signal and ramp signal; Switching circuit, comprises at least one switch, wherein said at least one switch under the control of switch controlling signal conducting and turn-off so that output voltage to be provided; And the foregoing soft circuit that opens.
According to embodiment of the present utility model, can realize and select flexibly according to actual needs outside soft opening or inner soft opening.
Brief description of the drawings
Fig. 1 is according to the block diagram of the monolithic integrated switch converter 100 of the utility model one embodiment;
Fig. 2 is the soft block diagram that opens circuit 200 according to the utility model one embodiment;
Fig. 3 is the soft circuit theory diagrams that open circuit 300 according to the utility model one embodiment;
Fig. 4 is the soft circuit theory diagrams that open circuit 400 according to another embodiment of the utility model;
Fig. 5 be according to the utility model one embodiment corresponding to soft external soft electric capacity and the soft graph of a relation that opens duration of opening that opens circuit 300 shown in Fig. 3.
Embodiment
To describe specific embodiment of the utility model below in detail, it should be noted that the embodiments described herein, only for illustrating, is not limited to the utility model.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail have been set forth.But, it will be obvious to those skilled in the art that and needn't adopt these specific detail to carry out the utility model.In other examples, for fear of obscuring the utility model, do not specifically describe known circuit, material or method.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: special characteristic, structure or characteristic in conjunction with this embodiment or example description are comprised at least one embodiment of the utility model.Therefore, differ and establish a capital the same embodiment of finger or example in each local phrase " in one embodiment ", " in an embodiment ", " example " or " example " occurring of whole specification.In addition, can with any suitable combination and/or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that the accompanying drawing providing at this is all for illustrative purposes, and accompanying drawing not necessarily in proportion draw.Should be appreciated that it can be directly connected or coupled to another element or can have intermediary element in the time claiming " element " " to be connected to " or " coupling " arrives another element.On the contrary, when claiming element " to be directly connected to " or when " being directly coupled to " another element, not having intermediary element.Identical Reference numeral is indicated identical element.Term "and/or" used herein comprises any and all combinations of one or more relevant projects of listing.
Fig. 1 is according to the block diagram of the monolithic integrated switch converter 100 of the utility model one embodiment.The output filter circuit that this monolithic integrated switch converter 100 comprises integrated circuit 10 and is made up of outputting inductance Lo and output capacitance Co.Wherein integrated circuit 10 is integrated on chip.Monolithic integrated switch converter 100 describes as an example of voltage-dropping type topology example, the known monolithic integrated switch of those skilled in the art converter 100 can adopt any DC-DC or ac/dc transformation topology structure, such as booster converter, buck converter, forward converter and anti exciting converter etc.
Integrated circuit 10 comprises soft circuit 11, error amplifying circuit 12, slope circuit for generating 13, logical circuit 14 and the switching circuit 15 of opening.In description, mark IN, SW, FB, SS and GND represent the pin of integrated circuit 10, wherein pin IN is coupled to input voltage vin, pin SW is coupled to one end of outputting inductance Lo, pin FB receives the feedback signal VFB that represents output voltage V o, pin GND is coupled to systematically, can couple the external soft capacitor C ext that opens between pin SS and pin GND.Monolithic integrated switch converter 100 can also comprise feedback circuit 16, and output voltage V o is coupled to pin FB by feedback circuit 16.
Soft one end of opening circuit 11 couples pin SS, the soft reference signal SSB that opens of other end output.Wherein unsettled as pin SS, namely do not couple external softly while opening capacitor C ext, the soft circuit 11 that opens is exported the soft reference signal SSB that opens increasing with fixed slope, and the soft duration that opens of monolithic integrated switch converter 100 is fixed.When pin SS couples external softly while opening capacitor C ext, the soft circuit 11 that opens is exported with the soft reference signal SSB that opens that fixed slope does not increase gradually, and it is relevant with the soft capacitance that opens capacitor C ext that monolithic integrated switch converter 100 soft opened duration.In one embodiment, can adjust the soft duration that opens of monolithic integrated switch converter 100 by adjusting the soft capacitance that opens capacitor C ext.Error amplifying circuit 12 receives soft reference signal SSB, output reference signal Vref and the feedback signal VFB of opening, wherein in the time that monolithic integrated switch converter 100 starts, when the soft reference signal SSB that opens is less than output reference signal Vref, error amplifying circuit 12 is according to the soft difference SSB-VFB output error signal Ve opening between reference signal SSB and feedback signal VFB.When soft, when opening reference signal SSB and increasing to output reference signal Vref, monolithic integrated switch converter 100 has started, and error amplifying circuit 12 is according to the difference Vref-VFB output error signal Ve exporting between reference signal Vref and feedback signal VFB.Slope circuit for generating 13 provides the ramp signal RAMP with some cycles.Ramp signal RAMP for example can be produced by oscillator.Logical circuit 14 is coupled to the output of error amplifying circuit 12 to receive error signal Ve, be coupled to the output of slope circuit for generating 13 to receive ramp signal RAMP, and produce the turn-on and turn-off of switch controlling signal CTRL with at least one switch in control switch circuit 15 based on error signal Ve and ramp signal RAMP.In one embodiment, thereby logical circuit 14 is opened the control switch cycle in moment according at least one switch in ramp signal RAMP control switch circuit 15, control duty ratio with regulation output voltage Vo thereby turn-off the moment according at least one switch of the comparative result control of error signal Ve and ramp signal RAMP.In the embodiment shown in fig. 1, switching circuit 15 comprises switch S 1 and switch S 2, wherein switch S 1 and switch S 2 complementary conducting under the control of switch controlling signal CTRL.In one embodiment, the first end of switch S 1 is coupled to pin IN to receive input voltage vin, and the second end of switch S 1 is coupled to pin SW, and the control end of switch S 1 couples switch controlling signal CTRL.The first end of switch S 2 is coupled to the second end and the pin SW of switch S 1, and the second end of switch S 2 is coupled to systematically, and the control end of switch S 2 couples switch controlling signal CTRL.Those skilled in the art are known, and switch S 1 and/or switch S 2 can be placed in integrated circuit 10 inside as shown in Figure 1, also can be placed in outside integrated circuit 10.
In the embodiment shown in fig. 1, can realize according to actual needs and to select flexibly outside soft opening or inner soft opening by the soft circuit 11 that opens.In the time of outside soft the opening of needs, pin SS couples the external soft capacitor C ext that opens, according to soft voltage or the outer soft soft reference signal SSB that opens of voltage control that opens of sheet of opening on sheet.In one embodiment, open speed that voltage increases and be less than on sheet softly while opening the speed that voltage increases when soft outside sheet, softly open that voltage control is soft opens reference signal SSB according to sheet is outer, thereby control the soft duration that opens.In inside, when soft opening, pin SS is unsettled, does not namely couple the external soft capacitor C ext that opens, and is produced the soft voltage that opens on sheet and is softly opened reference signal SSB to control, thereby control the soft duration that opens by the soft circuit 11 that opens.Wherein the soft duration that opens for example can be with soft to open reference signal SSB relevant by the time span that rises to output reference signal Vref above freezing, or for example can be relevant by the time span of the output voltage that rises to expection above freezing with output voltage V o.
Fig. 2 is the soft block diagram that opens circuit 200 according to the utility model one embodiment.The soft circuit 200 that opens comprises soft voltage generation circuit 201, operational amplification circuit 202, biasing circuit 203, buffer circuit 204 and the output regulation circuit 205 of opening on sheet.
On sheet, the soft voltage generation circuit 201 that opens provides the soft voltage Vc that opens on sheet at its output.Operational amplification circuit 202 has first input end 202a, the second input 202b, bias input end 202c and output terminals A, wherein first input end 202a is coupled on sheet the soft output that opens voltage generation circuit 201 with the soft voltage Vc that opens on receiving sheet, the output that the second input 202b is coupled to buffer circuit 204 softly opens reference signal SSB or represents the soft feedback signal that opens reference signal SSB to receive, bias input end 202c is coupled to the output of biasing circuit 203, output terminals A, as the pin SS of integrated circuit 10, can couple the external soft capacitor C ext that opens.Biasing circuit 203 provides bias current for operational amplification circuit 202, wherein the output terminals A of operational amplification circuit 202 couples external soft while opening capacitor C ext, operational amplification circuit 202 is to the external soft capacitor C ext charging of opening, and the external soft voltage VA that opens capacitor C ext two ends is the outer soft voltage that opens of sheet.The input of buffer circuit 204 is coupled to the output terminals A of operational amplification circuit 202, and the output of buffer circuit 204 provides the soft reference signal SSB that opens.In one embodiment, the soft circuit 200 that opens also comprises output regulation circuit 205, and the input of output regulation circuit 205 is coupled to the output of buffer circuit 204, the soft reference signal SSB that opens of output output of output regulation circuit 205.Buffer circuit 204 is exported the soft reference signal SSB that opens by output regulation circuit 205, and wherein output regulation circuit 205 is used for adjusting soft soft voltage Vc or the outer soft ratio opening between voltage VA of sheet of opening on reference signal SSB and sheet that open.
In one embodiment, in the time that pin SS is unsettled, namely the output terminals A of operational amplification circuit 202 does not couple the external soft capacitor C ext that opens, in the time that monolithic integrated switch converter 100 starts, on sheet, the soft voltage generation circuit 201 that opens provides the soft voltage Vc that opens on the sheet increasing with fixed slope, the soft circuit 200 that opens provides the soft reference signal SSB that opens according to the soft voltage Vc that opens on sheet, thereby controls the soft duration that opens of monolithic integrated switch converter 100.In one embodiment, when pin SS couples external soft while opening capacitor C ext, on sheet, the soft voltage generation circuit 201 that opens provides the soft voltage Vc that opens on the sheet increasing with fixed slope, operational amplification circuit 202 charges to provide the sheet increasing gradually the outer soft voltage VA that opens to the external soft capacitor C ext that opens, the soft circuit 200 that opens softly opens the soft voltage Vc that opens on voltage VA and/or sheet the soft reference signal SSB that opens is provided according to sheet is outer, for example open outer soft the opening of voltage Vc and sheet and in voltage VA, increase slower one of speed and determine the soft reference signal SSB that opens by soft on sheet, thereby control the soft duration that opens of monolithic integrated switch converter 100.
Embodiment shown in Fig. 2 is outside soft the opening or inner soft opening of flexible configuration according to actual needs, meets the different needs with simple Circnit Layout.
Fig. 3 is the soft circuit theory diagrams that open circuit 300 according to the utility model one embodiment.Wherein the soft circuit 300 that opens comprises and softly on sheet opens buffer circuit and the output regulation circuit 305 that voltage generation circuit 301, operational amplification circuit 302, biasing circuit 303, field effect transistor 304 form.
On sheet, the soft voltage generation circuit 301 that opens comprises the soft capacitor C int that opens on current source Ich and sheet, and wherein current source Ich opens capacitor C int charging and obtains the soft voltage Vc that opens on sheet with the soft capacitor C int two ends of opening on sheet soft on sheet.In one embodiment, one end of current source Ich couples auxiliary power supply voltage VCC, and the other end of current source Ich is coupled to soft one end of opening capacitor C int on sheet, and on sheet, the soft other end that opens capacitor C int is coupled to systematically.Biasing circuit 303 comprises current source Ib, and one end of current source Ib couples auxiliary power supply voltage VCC, and the other end of current source Ib provides constant current, and current source Ib for example can be realized by current mirror.Wherein symbol Ich both can represent current source Ich, also can represent the soft charging current Ich that opens capacitor C int on sheet.Symbol Ib both can represent current source Ib, also can represent the constant current Ib that biasing circuit 303 provides.
In the embodiment shown in fig. 3, operational amplification circuit 302 comprises that the Differential input circuit being made up of P-channel field-effect transistor (PEFT) pipe P1 and P-channel field-effect transistor (PEFT) pipe P2, the first transistor being made up of N channel field-effect pipe N1 and N channel field-effect pipe N2 are to, the transistor seconds pair that is made up of N channel field-effect pipe N3 and N channel field-effect pipe N4, and the 3rd transistor pair being made up of P-channel field-effect transistor (PEFT) pipe P3 and P-channel field-effect transistor (PEFT) pipe P4.Wherein the grid of P-channel field-effect transistor (PEFT) pipe P1 is coupled on sheet the soft capacitor C int that opens with the soft voltage Vc that opens on receiving sheet as an input of operational amplification circuit 302, the grid of P-channel field-effect transistor (PEFT) pipe P2 is coupled to the output of buffer circuit 304 as another input of operational amplification circuit 302, the source electrode of P-channel field-effect transistor (PEFT) pipe P1 and P-channel field-effect transistor (PEFT) pipe P2 is coupled to the current source Ib in biasing circuit 303 jointly.The grid of the grid of N channel field-effect pipe N1 and drain electrode and N channel field-effect pipe N2 is coupled to the drain electrode of P-channel field-effect transistor (PEFT) pipe P1 jointly, and the source electrode of the source electrode of N channel field-effect pipe N1 and N channel field-effect pipe N2 is coupled to systematically.The grid of the grid of N channel field-effect pipe N3 and drain electrode and N channel field-effect pipe N4 is coupled to the drain electrode of P-channel field-effect transistor (PEFT) pipe P2 jointly, and the source electrode of the source electrode of N channel field-effect pipe N3 and N channel field-effect pipe N4 is coupled to systematically jointly.The grid of the grid of P-channel field-effect transistor (PEFT) pipe P3 and drain electrode and P-channel field-effect transistor (PEFT) pipe P4 is coupled to the drain electrode of N channel field-effect pipe N4 jointly, the source electrode of the source electrode of P-channel field-effect transistor (PEFT) pipe P3 and P-channel field-effect transistor (PEFT) pipe P4 is coupled to auxiliary power supply voltage VCC jointly, together with the drain electrode of P-channel field-effect transistor (PEFT) pipe P4 is coupled in the drain electrode of N channel field-effect pipe N2 as the output terminals A of operational amplification circuit 302.One skilled in the art would recognize that operational amplification circuit 302 is not limited to the embodiment shown in Fig. 3, operational amplification circuit 302 can comprise the structure of the operational amplification circuit of any appropriate.Those skilled in the art also should be realized that, the transistor types in operational amplification circuit 203 is also not limited to the embodiment shown in Fig. 3, can comprise the transistor of any appropriate, for example triode.
The grid of field effect transistor 304 is coupled to the output terminals A of operational amplification circuit 302 as the input of buffer circuit, the drain electrode of field effect transistor 304 is coupled to auxiliary power supply voltage VCC, and the source electrode of field effect transistor 304 provides the soft reference signal SSB that opens as the output of buffer circuit by output regulation circuit 305.In the embodiment shown in fig. 3, field effect transistor 304 is N channel field-effect pipe, but those skilled in the art are known, and the transistor of other any appropriate also can be used as buffer circuit, such as triode, P type field effect transistor etc.
Output regulation circuit 305 comprises resistance R 1 and resistance R 2, wherein one end of resistance R 1 is coupled to the source electrode of field effect transistor 304, the other end of resistance R 1 is coupled to one end of resistance R 2, the other end of resistance R 2 is coupled to systematically, and the common port of resistance R 1 and resistance R 2 is as the soft reference signal SSB that opens of output output of output regulation circuit 305.In one embodiment, by the value of adjusting resistance R1 and resistance R 2, can adjust soft soft voltage Vc or the outer soft ratio opening between voltage VA of sheet of opening on reference signal SSB and sheet that open.
In one embodiment, in the time that pin SS is unsettled, namely do not couple external softly while opening capacitor C ext, the soft reference signal SSB that opens is determined by soft capacitor C int, resistance R 1 and the resistance R 2 of opening on current source Ich, sheet.When monolithic integrated switch converter 100 starts, current source Ich opens capacitor C int charging to soft on sheet, and on sheet, the soft voltage Vc that opens increases gradually with fixed slope, and the soft reference signal SSB that opens opens the increase of voltage Vc and increases gradually along with soft on sheet.In one embodiment, on sheet, the soft slope Dvc/Dt that opens voltage Vc increase equals:
Dvc/Dt＝Ich/Cint (1)
In one embodiment, the soft reference signal SSB that opens equals Vc*R2/ (R1+R2).
In one embodiment, when pin SS couples external soft while opening capacitor C ext, current source Ich charges to the soft capacitor C int that opens on sheet, on sheet, the soft voltage Vc that opens increases gradually with the fixed slope shown in formula (1), current source Ib charges to the external soft capacitor C ext that opens by operational amplification circuit 302, the electric current of charging is Iext, the outer soft voltage VA that opens of sheet increases gradually, the soft reference signal SSB that opens is opened outer soft the opening of voltage Vc and sheet and in voltage VA, is increased a slower decision of speed by soft on sheet, wherein operational amplification circuit 302 is according to the soft outer soft size that opens voltage VA and automatically adjust electric current I ext of voltage Vc and sheet that opens on sheet, 0<=Iext<=Ib.The outer soft slope Dva/Dt that opens voltage VA increase of sheet equals:
Dva/Dt＝Iext/Cext (2)
Embodiment shown in Fig. 3 also comprises clamp circuit 307.When monolithic integrated switch converter 100 starts to start, the voltage of the output terminals A of operational amplification circuit 302 increases to rapidly the cut-in voltage VGSth of field effect transistor 304 under the effect of clamp circuit 307, and field effect transistor 304 is open-minded.In the embodiment shown in fig. 3, clamp circuit 307 comprises bias current sources Ib2, field effect transistor N5 and field effect transistor N6.One end of bias current sources Ib2 is coupled to auxiliary power supply voltage VCC, the other end of bias current sources Ib2 is coupled to the drain electrode of grid and the field effect transistor N6 of field effect transistor N5, the drain electrode of field effect transistor N5 is coupled to auxiliary power supply voltage VCC, the grid of the source electrode of field effect transistor N5 and field effect transistor N6 is coupled to the output terminals A of operational amplification circuit 302, and the source electrode of field effect transistor N6 is coupled to systematically.
Fig. 4 is the soft circuit theory diagrams that open circuit 400 according to another embodiment of the utility model.It is soft shown in Fig. 4 that to open the circuit structure of circuit 400 similar with the soft circuit structure that opens circuit 300 shown in Fig. 3, to open circuit 300 different from soft shown in Fig. 3, softly shown in Fig. 4 open in circuit 400 the soft circuit 401 that opens on sheet and comprise the soft capacitor C int that opens on switch S 11, switch S 12, current source Ich, current source Idis and sheet.Switch S 11 is coupled to current source Ich, and switch S 12 is coupled to current source Idis, wherein switch S 11 and switch S 12 complementary conducting under the control of the signal Hiccup that has the hiccups.When switch S 11 conductings, when switch S 12 is turn-offed, current source Ich charges to the soft capacitor C int that opens on sheet, and when switch S 12 conductings, when switch S 11 is turn-offed, on sheet, the soft capacitor C int that opens discharges by current source Idis.
In one embodiment; monolithic integrated switch converter 100 is under the malfunction such as output short-circuit, overcurrent; enter the pattern of having the hiccups, namely under error protection, attempt repeatedly restarting, until malfunction is eliminated or monolithic integrated switch converter 100 thoroughly turn-offs.
In one embodiment, when pin, SS is unsettled, in the time that monolithic integrated switch converter 100 starts, have the hiccups signal Hiccup in the first state, switch S 11 conductings, switch S 12 is turn-offed, current source Ich charges to the soft capacitor C int that opens on sheet, on sheet, the soft voltage Vc that opens increases gradually with the fixed slope shown in formula (1), and the soft reference signal SSB that opens increases thereupon, and the soft duration that opens is determined by the soft voltage Vc that opens on sheet; Monolithic integrated switch converter 100 is soft while also not entering normal work after opening end, for example, when output voltage V o does not also reach the output voltage of expection, have the hiccups signal Hiccup in the second state, switch S 11 is turn-offed, switch S 12 conductings, current source Idis discharges to the soft capacitor C int that opens on sheet, on sheet, the soft voltage Vc that opens reduces, until the soft voltage Vc that opens is decreased to a minimum voltage on sheet, for example zero, monolithic integrated switch converter 100 is attempted restarting, and the signal Hiccup that has the hiccups is in the first state, and current source Ich charges to the soft capacitor C int that opens on sheet.So circulation, until the normal work of monolithic integrated switch converter 100 or restart the number of times upper limit and thoroughly turn-off because reaching.
In one embodiment, when pin SS couples the external soft capacitor C ext that opens, in the time that monolithic integrated switch converter 100 starts, have the hiccups signal Hiccup in the first state, switch S 11 conductings, switch S 12 is turn-offed, current source Ich charges to the soft capacitor C int that opens on sheet, on sheet, the soft voltage Vc that opens increases gradually with the fixed slope shown in formula (1), current source Ib charges to the external soft capacitor C ext that opens by operational amplification circuit 302, the electric current of charging is Iext, the outer soft voltage VA that opens of sheet increases gradually with the slope shown in formula (2), the soft reference signal SSB that opens is opened outer soft the opening of voltage Vc and sheet and in voltage VA, is increased a slower decision of speed by soft on sheet, thereby the soft duration that opens softly opens the soft voltage Vc that opens on voltage VA and/or sheet and determines by sheet is outer.In one embodiment, operational amplification circuit 302 is according to the soft outer soft size that opens voltage VA and automatically adjust electric current I ext of voltage Vc and sheet, the wherein 0<=Iext<=Ib of opening on sheet.Monolithic integrated switch converter 100 is soft while also not entering normal work after opening end, for example, when output voltage V o does not also reach the output voltage of expection, have the hiccups signal Hiccup in the second state, switch S 11 is turn-offed, switch S 12 conductings, current source Idis discharges to the soft capacitor C int that opens on sheet, on sheet, the soft voltage Vc that opens reduces, current source Ib discharges to the external soft capacitor C ext that opens by operational amplification circuit 302, the outer soft voltage VA that opens of sheet reduces, the soft reference signal SSB that opens is opened outer soft the opening of voltage Vc and sheet and in voltage VA, is reduced a slower decision of speed by soft on sheet, when the soft reference signal SSB that opens is decreased to a minimum voltage, for example zero, monolithic integrated switch converter 100 is attempted restarting, have the hiccups signal Hiccup in the first state, current source Ich charges to the soft capacitor C int that opens on sheet, current source Ib charges to the external soft capacitor C ext that opens by operational amplification circuit 302, so circulation, until the normal work of monolithic integrated switch converter 100 or restart the number of times upper limit and thoroughly turn-off because reaching.
In the embodiment shown in fig. 4, can have the hiccups and attempt length interval time that restarts in pattern, the duration of signal Hiccup in the second state of namely having the hiccups by the size adjustment of current source Idis is set.
Fig. 5 be according to the utility model one embodiment corresponding to soft external soft electric capacity and the soft graph of a relation that opens duration of opening that opens circuit 300 shown in Fig. 3.As shown in Figure 5, when external soft when opening capacitor C ext and being less than Cint*Ib/Ich, the soft circuit 300 that opens is selected inner soft opening, for example, control and softly open reference signal SSB according to the soft voltage Vc that opens on sheet, thereby the soft duration SStime that opens fixes, for example, equal 1ms.When external soft when opening capacitor C ext and being greater than Cint*Ib/Ich, the soft circuit 300 that opens is selected outside soft opening, for example, control the soft reference signal SSB that opens according to the outer soft voltage VA that opens of sheet, and the soft duration SStime that opens softly opens the increase of capacitor C ext and increases along with external.
Although described the utility model with reference to several exemplary embodiments, should be appreciated that term used is explanation and exemplary and nonrestrictive term.Because the utility model can specifically be implemented in a variety of forms and not depart from spirit or the essence of utility model, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (9)
1. the soft circuit that opens, for monolithic integrated switch converter, is characterized in that, the described soft circuit that opens comprises:
The soft voltage generation circuit that opens on sheet, provides the soft voltage that opens on sheet at its output;
Operational amplification circuit, there is first input end, the second input and output, wherein first input end is coupled on sheet the soft output that opens voltage generation circuit with the soft voltage that opens on receiving sheet, the second input receives and softly opens reference signal or represent the soft feedback signal that opens reference signal, and output can couple the external soft electric capacity that opens as a pin of integrated circuit; And
Buffer circuit, has input and output, and wherein input is coupled to the output of operational amplification circuit, and output provides the soft reference signal that opens; Wherein
When the output of operational amplification circuit does not couple external softly while opening electric capacity, the soft circuit that opens provides the soft reference signal that opens based on the soft voltage that opens on sheet; And
When the output of operational amplification circuit couples external softly while opening electric capacity, operational amplification circuit is to the external soft capacitor charging that opens to provide sheet the outer soft voltage that opens, and the soft circuit that opens opens voltage and the outer soft voltage that opens of sheet provides the soft reference signal that opens based on soft on sheet.
2. the soft circuit that opens as claimed in claim 1, it is characterized in that, when the output of operational amplification circuit couples external softly while opening electric capacity, operational amplification circuit opens voltage and the outer soft voltage that opens of sheet is adjusted automatically to the external soft size of current that opens capacitor charging according to soft on sheet.
3. the soft circuit that opens as claimed in claim 1, is characterized in that, on sheet, the soft circuit that opens also comprises:
The first current source, provides charging current; And
On sheet, the soft electric capacity that opens, is coupled to the first current source, the first current source with charging current to the soft capacitor charging that opens on sheet to obtain the soft voltage that opens on sheet.
4. the soft circuit that opens as claimed in claim 1, is characterized in that, on sheet, the soft circuit that opens also comprises:
The first current source, provides charging current;
The second current source, provides discharging current; And
On sheet, the soft electric capacity that opens, is coupled to the first current source by the first switch, is coupled to the second current source by second switch; Wherein
When the signal of having the hiccups is during in the first state, the first switch conduction, second switch turn-offs, and the charging current that the first current source provides is to the soft capacitor charging that opens on sheet; And
When the signal of having the hiccups is during in the second state, second switch conducting, the first switch turn-offs, and the discharging current that the second current source provides is to the soft capacitor discharge that opens on sheet.
5. the soft circuit that opens as claimed in claim 1, is characterized in that, also comprises:
Biasing circuit, provides bias current at its output, described bias current by operational amplification circuit to the external soft capacitor charging that opens; Wherein
The external soft electric current that opens capacitor charging is not more than to bias current.
6. the soft circuit that opens as claimed in claim 5, is characterized in that, operational amplification circuit comprises:
Differential input circuit, comprise the first P-channel field-effect transistor (PEFT) pipe and the second P-channel field-effect transistor (PEFT) pipe, wherein the grid of the first P-channel field-effect transistor (PEFT) pipe is coupled to the soft output that opens voltage generation circuit on sheet, the grid of the second P-channel field-effect transistor (PEFT) pipe is coupled to the output of buffer circuit, and the source electrode of the first P-channel field-effect transistor (PEFT) pipe and the second P-channel field-effect transistor (PEFT) pipe is coupled to the output of biasing circuit;
The first transistor pair, comprise a N channel field-effect pipe and the 2nd N channel field-effect pipe, wherein the grid of the grid of a N channel field-effect pipe and drain electrode and the 2nd N channel field-effect pipe is coupled to the drain electrode of the first P-channel field-effect transistor (PEFT) pipe jointly, the source electrode of the one N channel field-effect pipe and the 2nd N channel field-effect pipe is coupled to systematically, and the drain electrode of the 2nd N channel field-effect pipe is coupled to the output of operational amplification circuit;
Transistor seconds pair, comprise the 3rd N channel field-effect pipe and the 4th N channel field-effect pipe, wherein the grid of the grid of the 3rd N channel field-effect pipe and drain electrode and the 4th N channel field-effect pipe is coupled to the drain electrode of the second P-channel field-effect transistor (PEFT) pipe jointly, and the source electrode of the source electrode of the 3rd N channel field-effect pipe and the 4th N channel field-effect pipe is coupled to systematically; And
The 3rd transistor pair, comprise the 3rd P-channel field-effect transistor (PEFT) pipe and the 4th P-channel field-effect transistor (PEFT) pipe, wherein the grid of the grid of the 3rd P-channel field-effect transistor (PEFT) pipe and drain electrode and the 4th P-channel field-effect transistor (PEFT) pipe is coupled to the drain electrode of the 4th N channel field-effect pipe, the source electrode of the 3rd P-channel field-effect transistor (PEFT) pipe and the 4th P-channel field-effect transistor (PEFT) pipe is coupled to auxiliary power supply voltage, and the drain electrode of the 4th P-channel field-effect transistor (PEFT) pipe is coupled to the drain electrode of the 2nd N channel field-effect pipe and the output of operational amplification circuit.
7. the soft circuit that opens as claimed in claim 1, it is characterized in that, buffer circuit also comprises: the 5th N channel field-effect pipe, wherein the grid of the 5th N channel field-effect pipe is coupled to the output of operational amplification circuit, the drain electrode of the 5th N channel field-effect pipe is coupled to auxiliary power supply voltage, and the source electrode of the 5th N channel field-effect pipe is as the output of buffer circuit.
8. the soft soft circuit that opens claimed in claim 1, is characterized in that, also comprise clamp circuit, described clamp circuit comprises:
The 3rd current source, has first end and the second end, and wherein first end is coupled to auxiliary power supply voltage;
The first clamp switch, has first end, the second end and control end, and wherein control end is coupled to the second end of the 3rd current source, and first end is coupled to the output of operational amplification circuit, and the second end is coupled to auxiliary power supply voltage; And
The second clamp switch, has first end, the second end and control end, and wherein control end is coupled to the output of operational amplification circuit, and first end is coupled to systematically, and the second end is coupled to the second end of the 3rd current source; Wherein
In the time that monolithic integrated switch converter starts to start, the voltage of operational amplification circuit output increases to open buffer circuit under the effect of described clamp circuit.
9. a monolithic integrated switch converter, is characterized in that, comprising:
Error amplifying circuit, receive and softly open reference signal, export reference signal and represent the feedback signal of output voltage, wherein when the soft reference signal that opens is less than output when reference signal, error amplifying circuit is according to the soft difference output error signal opening between reference signal and feedback signal, and being greater than output when reference signal when the soft reference signal that opens, error amplifying circuit is according to the difference output error signal between output reference signal and feedback signal;
Slope circuit for generating, provides ramp signal;
Logical circuit, is coupled to error amplifying circuit and slope circuit for generating to receive error signal and ramp signal, and produces switch controlling signal based on error signal and ramp signal;
Switching circuit, comprises at least one switch, wherein said at least one switch under the control of switch controlling signal conducting and turn-off so that output voltage to be provided; And
The soft circuit that opens as described in any one in claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420227640.1U CN203840199U (en) | 2014-05-06 | 2014-05-06 | Monolithic integrated switch converter and soft start circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420227640.1U CN203840199U (en) | 2014-05-06 | 2014-05-06 | Monolithic integrated switch converter and soft start circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN203840199U true CN203840199U (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420227640.1U Withdrawn - After Issue CN203840199U (en) | 2014-05-06 | 2014-05-06 | Monolithic integrated switch converter and soft start circuit thereof |
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| CN (1) | CN203840199U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929056A (en) * | 2014-05-06 | 2014-07-16 | 成都芯源***有限公司 | Single-chip integrated switch converter and soft start circuit and soft start method thereof |
| CN106300950A (en) * | 2016-08-30 | 2017-01-04 | 硅谷数模半导体（北京）有限公司 | Start-up circuit and startup method thereof |
| CN107395016A (en) * | 2017-08-23 | 2017-11-24 | 成都芯源***有限公司 | Current detection circuit and integrated circuit for buck-boost converter |
-
2014
- 2014-05-06 CN CN201420227640.1U patent/CN203840199U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929056A (en) * | 2014-05-06 | 2014-07-16 | 成都芯源***有限公司 | Single-chip integrated switch converter and soft start circuit and soft start method thereof |
| CN106300950A (en) * | 2016-08-30 | 2017-01-04 | 硅谷数模半导体（北京）有限公司 | Start-up circuit and startup method thereof |
| CN106300950B (en) * | 2016-08-30 | 2019-07-23 | 硅谷数模半导体（北京）有限公司 | Start-up circuit and its starting method |
| CN107395016A (en) * | 2017-08-23 | 2017-11-24 | 成都芯源***有限公司 | Current detection circuit and integrated circuit for buck-boost converter |
| CN107395016B (en) * | 2017-08-23 | 2019-10-25 | 成都芯源***有限公司 | Current detection circuit and integrated circuit for buck-boost converter |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140917 Effective date of abandoning: 20160824 |
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