CN103199689B - A kind of Switching Power Supply with input voltage undervoltage lookout function - Google Patents
A kind of Switching Power Supply with input voltage undervoltage lookout function Download PDFInfo
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- CN103199689B CN103199689B CN201310136113.XA CN201310136113A CN103199689B CN 103199689 B CN103199689 B CN 103199689B CN 201310136113 A CN201310136113 A CN 201310136113A CN 103199689 B CN103199689 B CN 103199689B
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Abstract
The present invention relates to switching power source chip designing technique.The invention discloses a kind of Switching Power Supply with input voltage undervoltage lookout function, comprise the first NMOS tube, the second NMOS tube, the 3rd NMOS tube, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first diode, the second diode, inductance and linear voltage regulator module, under-voltage locking module, upper pipe driver module and control module.Switching Power Supply of the present invention does not need comparator and reference voltage to realize input voltage under-voltage locking, reduce circuit complexity, because other high pressure resistant device realizes input voltage undervoltage lookout function in system for recycling, therefore save chip area and cost.
Description
Technical field
The present invention relates to switching power source chip designing technique, be specifically related to a kind of switch power integrated circuit with input voltage undervoltage lookout function.
Background technology
In order to make the work of switching power source chip normal table, its input voltage must be in certain scope, and guarantee chip provides reliable and stable power supply to application system.When input voltage reduces, under lower input voltage, chip internal modules works near minimum, is very easy to cause built-in function abnormal, thus causes power supply instability, even may cause having a strong impact on to application system.And when input voltage is from powered battery, too low discharge voltage easily causes overdischarge phenomenon, and this has serious harm to battery life.So in order to postpone battery life, ensure that switching power source chip normally works; in Switching Power Supply design; whether need input voltage undervoltage lockout circuit to carry out monitoring input voltage is within normal input voltage range; so that when input voltage is lower than permissible range; cut off the electricity supply in time, for power-supply system and application system provide protection.
In current switch power supply system, some is design input voltage undervoltage lockout circuit being placed in system peripherals circuit, and this design certainly will increase device count and the area of printed circuit board, is unfavorable for reducing costs and improving integrated level.In order to improve level of integrated system, generally all input voltage lock-in circuit is integrated in chip internal now.Such as ' undervoltage lockout circuit that Power supply moduledesign in the low power consumption application ' by PAN H, WU X, CHEN H propose is exactly a kind of circuit structure being integrated in chip internal to document.Adopt the Switching Power Supply of this under-voltage locking (UVLO) module; usually also comprise linear voltage regulator module, upper pipe driver module, control module etc., in its circuit arrangement be mostly by the supply voltage of sampling and reference voltage by comparator compare judge whether under-voltage.The shortcoming of this kind of circuit design, one is need to realize reference circuit and comparator circuit, and circuit structure is complicated, and power consumption is larger; Two is under relative broad range input voltage application background, and need extra resistance to voltage device to protect each device in undervoltage lockout circuit not breakdown, this will increase chip area and cost.
Summary of the invention
Technical problem to be solved by this invention is exactly the above-mentioned shortcoming for prior art, provides a kind of Switching Power Supply with input voltage undervoltage lookout function.
The present invention solve the technical problem, the technical scheme adopted is, a kind of Switching Power Supply with input voltage undervoltage lookout function, it is characterized in that, comprise the first NMOS tube, the second NMOS tube, the 3rd NMOS tube, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first diode, the second diode, inductance and linear voltage regulator module, under-voltage locking module, upper pipe driver module and control module; One end of linear voltage regulator module is connected with the drain electrode of chip exterior supply voltage with the second NMOS tube, and one end of the source electrode of the other end and the first NMOS tube, the positive pole of the first diode, the positive pole of the second diode, the first end of control module and the 3rd electric capacity is all connected; One end of the drain electrode of the first NMOS tube, the negative pole of the second diode, the second electric capacity, the first end of under-voltage locking module are all connected with the first end of upper pipe driver module; The grid of the first NMOS tube, the positive pole of the first diode are connected with one end of the first electric capacity; The drain electrode of the second end of the other end of the second electric capacity, the second end of under-voltage locking module, upper pipe driver module, the source electrode of the second NMOS tube, the 3rd NMOS tube is all connected with one end of inductance; 3rd end of under-voltage locking module is connected with the 3rd end of upper pipe driver module; The other end of inductance is connected with one end of the 4th electric capacity; 4th end of upper pipe driver module is connected with the grid of the second NMOS tube; Second end of control module is connected with the five terminal of upper pipe driver module, its the 3rd end is connected with the grid of the 3rd NMOS tube and the other end of the first electric capacity, and the other end of the source electrode of its 4th end and the 3rd NMOS tube, the other end of the 3rd electric capacity, the 4th electric capacity is all connected with earth potential.
Further, described linear voltage regulator module is low pressure difference linear voltage regulator module.
Concrete, described under-voltage locking module has hysteretic characteristic.
The invention has the beneficial effects as follows and do not need comparator and reference voltage to realize input voltage under-voltage locking, reduce circuit complexity, because other high pressure resistant device realizes input voltage undervoltage lookout function in system for recycling, therefore save chip area and cost.In addition, the present invention also directly monitors the voltage difference of upper pipe driver module, avoids the not enough driving force caused of voltage difference more in time and declines and consequent a series of serious problems.
Accompanying drawing explanation
Fig. 1 electrical block diagram of the present invention;
Fig. 2 is key signal normal timing diagram;
Fig. 3, Fig. 4 and Fig. 5 are the equivalent circuit diagram of Switching Power Supply of the present invention under different mode;
Fig. 6 is the abnormal sequential chart of key signal.
In figure: M1, M2, M3 are NMOS tube (N-type mos field effect transistor), and wherein M2 is connected with power supply and is called upper pipe, and M3 ground connection is called lower pipe; C1, C2, C3, COUT are electric capacity; D1, D2, D3 are diode, and wherein D3 is the body diode of M3 or is called parasitic diode; L is inductance; LVR is linear voltage regulator module; UVLO is under-voltage locking module; HDR is upper pipe driver module; CTRL is control module.
Embodiment
Below in conjunction with drawings and the specific embodiments, describe technical scheme of the present invention in detail.
The problem such as many and area is larger for the complex structure in existing switch power supply system existing for input voltage undervoltage lockout circuit, device, the present invention proposes a kind of Switching Power Supply with input voltage undervoltage lookout function, particular circuit configurations as shown in Figure 1, comprise NMOS tube M1, M2, M3, electric capacity C1, C2, C3, COUT, diode D1, D2, inductance L and linear voltage regulator module LVR, under-voltage locking module UVLO, upper pipe driver module HDR and control module CTRL.Concrete annexation is as follows:
The power input of linear voltage regulator module LVR is connected with the drain electrode of NMOS tube M2 with chip exterior input supply voltage VIN, and one end of the source electrode of its output VDD and NMOS tube M1, the positive pole of diode D1, the positive pole of diode D2, the first end of control module CTRL and electric capacity C2 is connected.One end of the drain electrode of NMOS tube M1, the negative pole of diode D2, electric capacity C2, the first end of under-voltage locking module UVLO are all connected with the first end of upper pipe driver module HDR; The grid of NMOS tube M1 is connected with the negative pole of one end of electric capacity C1 and diode D1.The other end of electric capacity C2, second end of under-voltage locking module UVLO, second end of upper pipe driver module HDR, the source electrode of NMOS tube M2, the drain electrode of NMOS tube M3 are all connected with one end of inductance L.3rd end of under-voltage locking module UVLO is connected with the 3rd end of upper pipe driver module HDR.The other end of inductance L is connected with one end of electric capacity COUT.4th end of upper pipe driver module HDR is connected with the grid of NMOS tube M2.Second end of control module CTRL is connected with the five terminal of upper pipe driver module HDR, 3rd end of control module CTRL is connected with the grid of NMOS tube M3 and the other end of electric capacity C1, and the 4th end of control module CTRL and the source electrode of NMOS tube M3, the other end of electric capacity C3, the other end of electric capacity COUT are all connected with earth potential.
Wherein, linear voltage regulator module LVR comprises low pressure difference linear voltage regulator (LDO) etc., also referred to as low pressure difference linear voltage regulator module, its Main Function is for each circuit module of chip internal provides the operating voltage of safety and stability, illustrate only power input VIN and output VDD in Fig. 1, eliminate other signals such as enable control signal, reference voltage, bias current, earth potential.Electric capacity C3 is the filter capacitor of LVR, and diode D1 and electric capacity C1 forms local boostrap circuit, with driving N metal-oxide-semiconductor M1.NMOS tube M1, diode D2 and electric capacity C2 form boostrap circuit, make to remain constant voltage difference between BST node and SW node, for upper pipe driver module HDR provides floating power rail, to drive described NMOS tube M2.Whether under-voltage locking module UVLO detects floating power supply rail under-voltage, and without the need to external reference voltages or electric current for referencial use.Control module CTRL comprises loop ratio comparatively, and output voltage is crossed, press under-voltage protection, and the functions such as output current protection and logical process, in Fig. 1, dotted line represents fed-back current signals or voltage signal, and FB is the feedback signal link of control module CTRL.NMOS tube M2, M3, inductance L and output capacitance COUT form the Basic Topological of Switching Power Supply, and other biasing circuits etc. mark.
Below respectively for the on off state that NMOS tube M2, M3 in one-period are different, Switching Power Supply operation principle of the present invention is set forth.
1, NMOS tube M2 shutoff, NMOS tube M3 open:
As shown in Figure 2, when described control module CTRL exports state before control signal HSG and LSG is in moment T1, in Fig. 1, NMOS tube M2 shutoff, NMOS tube M3 open, and NMOS tube M1 also opens.If now ignore the conduction voltage drop on NMOS tube M1 and NMOS tube M3, then Fig. 1 circuit can be equivalent to circuit shown in Fig. 3.As can see from Figure 3, now SW is connected with earth potential, and BST node is connected with VDD, and VDD makes pressure reduction between BST node and SW node raise to electric capacity C2 charging, suppose that the time enough, the pressure reduction between BST node and SW node will equal the pressure reduction between VDD and earth potential.Also can not have an impact to system even if it should be noted that is triggered in section between under-voltage locking module UVLO at this moment.
2, NMOS tube M2, M3 turn off first simultaneously:
As shown in Figure 2, when control module CTRL output control signal HSG and LSG is in state between moment T1 and T2, in Fig. 1, NMOS tube M2, M3 turn off first simultaneously, NMOS tube M1 also turns off, now due to the afterflow characteristic of inductance, SW node reduces to negative potential (being about body diode D3 forward conduction voltage drop), thus the body diode of NMOS tube M3 is forced open as inductance L carries out afterflow, then Fig. 1 circuit can be equivalent to circuit shown in Fig. 4.As can see from Figure 4, now SW node is connected with earth potential by the body diode D3 of NMOS tube M3, BST node is connected by diode D2 and VDD, because this stage upper pipe driver module road HDR does not have rotary movement, BST node and SW node still keep original constant voltage, but equal VDD and earth potential no longer respectively, and be VDD-VD and-VD (supposing that the body diode D3 forward conduction voltage drop of diode D2 and M3 is equal) respectively.It should be noted that is triggered in section between under-voltage locking module UVLO at this moment also can not have an impact to system immediately, but at the end of this stage, whether whether under-voltage decide of input voltage triggers input voltage under-voltage protection function.
If A does not occur under-voltage or under-voltagely to be removed in time at the end of this stage, then in the next stage (moment T2-T3), each drive singal normally overturns, NMOS tube M2 opens, NMOS tube M3 turns off, if ignore the conduction voltage drop on NMOS tube M2, then SW node is connected with VIN, VIN is by NMOS tube M2 to inductance L transmission current, and Fig. 1 circuit can be equivalent to circuit shown in Fig. 5.
Do not remove if B is under-voltage at the end of this stage, then in the next stage (moment T2-T3), the under-voltage signal shielding that HSG signal is exported by under-voltage locking module UVLO, the drive singal that upper pipe driver module HDR exports does not overturn, NMOS tube M2, M3 all continue to keep off state, and Fig. 1 circuit still can be equivalent to circuit shown in Fig. 4.Under supposing that Switching Power Supply is in continuous ON operation pattern, then SW node waveform figure as shown in Figure 6.Until VDD makes voltage difference between BST node and SW node can unlock higher than under-voltage locking module UVLO threshold value to electric capacity C1 charging when next cycle NMOS tube M1 opens.If after date was removed not yet in several week, electric capacity COUT can not get energy supplement by continuing, and finally cause VOUT node voltage to drop to flip chip output voltage under-voltage protective module after certain value, chip quits work.
It should be noted that, in the above-mentioned under-voltage locking course of work, the floating power supply voltage difference of under-voltage locking module UVLO to upper pipe driver module road HDR is directly monitored, so just can avoid more in time due to a series of serious problems that the driving force that causes of voltage difference deficiency is not enough and bring thus, Here it is another beneficial effect of the present invention.
Suppose that under-voltage locking module UVLO has hysteretic characteristic, if it triggers lock threshold voltage is V
lOCK, the threshold voltage that unlocks is V
uNLOCK, the voltage difference between the input voltage VIN of linear voltage stabilization module LVR and output voltage VDD is V
dROP(for linear voltage regulator, the V when VIN is lower
dROPexcursion is little), then can obtain as drawn a conclusion:
(1) trigger threshold voltage of input voltage under-voltage locking can be expressed as VIN
lOCK=V
lOCK+ V
dROP;
(2) the releasing threshold voltage of input voltage under-voltage locking can be expressed as VIN
uNLOCK=V
uNLOCK+ V
dROP.
Can find out, by regulating the threshold voltage (V of UVLO
lOCKand V
uNLOCK) input voltage brownout threshold point (VIN can be set
lOCKand VIN
uNLOCK)
In sum, the Switching Power Supply with input voltage undervoltage lookout function of the present invention is ingenious achieves input voltage undervoltage lookout function by the resistance to voltage device in Serial regulation module, the architectural characteristic of boostrap circuit and the switching device of Switching Power Supply.
It should be noted that:
One, owing to present invention focuses on to propose a kind of Switching Power Supply structure with input voltage undervoltage lookout function, realize not repeating to UVLO internal circuit.
Two, under-voltage locking module UVLO can have hysteretic characteristic and also can not have hysteretic characteristic, is all applicable to Switching Power Supply of the present invention.
Three, only include the closely-related module with the present invention in Switching Power Supply schematic diagram of the present invention and statement, do not mention or identify other and the statement module that has nothing to do of the present invention or circuit details.
Foregoing is described in detail Switching Power Supply of the present invention, principle of the present invention and execution mode are set forth, more than implement an example and only understand general principle of the present invention and core concept thereof for helping, to the change that embodiment is done on its general principles and core concept thereof, all should belong within scope of the present invention.
Claims (1)
1. one kind has the Switching Power Supply of input voltage undervoltage lookout function, it is characterized in that, comprise the first NMOS tube, the second NMOS tube, the 3rd NMOS tube, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first diode, the second diode, inductance and linear voltage regulator module, under-voltage locking module, upper pipe driver module and control module; One end of linear voltage regulator module is connected with the drain electrode of chip exterior supply voltage with the second NMOS tube, and one end of the source electrode of the other end and the first NMOS tube, the positive pole of the first diode, the positive pole of the second diode, the first end of control module and the 3rd electric capacity is all connected; One end of the drain electrode of the first NMOS tube, the negative pole of the second diode, the second electric capacity, the first end of under-voltage locking module are all connected with the first end of upper pipe driver module; The grid of the first NMOS tube, the positive pole of the first diode are connected with one end of the first electric capacity; The drain electrode of the second end of the other end of the second electric capacity, the second end of under-voltage locking module, upper pipe driver module, the source electrode of the second NMOS tube, the 3rd NMOS tube is all connected with one end of inductance; 3rd end of under-voltage locking module is connected with the 3rd end of upper pipe driver module; The other end of inductance is connected with one end of the 4th electric capacity; 4th end of upper pipe driver module is connected with the grid of the second NMOS tube; Second end of control module is connected with the five terminal of upper pipe driver module, its the 3rd end is connected with the grid of the 3rd NMOS tube and the other end of the first electric capacity, and the other end of the source electrode of its 4th end and the 3rd NMOS tube, the other end of the 3rd electric capacity, the 4th electric capacity is all connected with earth potential;
Described linear voltage regulator module is low pressure difference linear voltage regulator module;
Described under-voltage locking module has hysteretic characteristic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310136113.XA CN103199689B (en) | 2013-04-18 | 2013-04-18 | A kind of Switching Power Supply with input voltage undervoltage lookout function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310136113.XA CN103199689B (en) | 2013-04-18 | 2013-04-18 | A kind of Switching Power Supply with input voltage undervoltage lookout function |
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| CN103199689A CN103199689A (en) | 2013-07-10 |
| CN103199689B true CN103199689B (en) | 2015-08-19 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107769549A (en) * | 2014-01-08 | 2018-03-06 | 联发科技（新加坡）私人有限公司 | A kind of integrated circuit |
| CN105871180B (en) * | 2016-04-08 | 2018-07-17 | 厦门大学 | A kind of high current CMOS push-pull driver circuits and its control method |
| CN110994996B (en) * | 2019-12-31 | 2021-03-23 | 思瑞浦微电子科技（苏州）股份有限公司 | Asynchronous step-down DCDC chip and bootstrap circuit based on asynchronous step-down DCDC chip |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1682575A (en) * | 2002-07-09 | 2005-10-12 | 国际整流器公司 | Adaptive ballast control IC |
| CN1914787A (en) * | 2004-01-28 | 2007-02-14 | 株式会社瑞萨科技 | Switching power supply and semiconductor integrated circuit |
| CN101483353A (en) * | 2009-02-05 | 2009-07-15 | 中国航天时代电子公司第七七一研究所 | Buck type auxiliary electric power controlled by PFM |
| CN101529716A (en) * | 2006-10-20 | 2009-09-09 | Nxp股份有限公司 | Power amplifier |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7106105B2 (en) * | 2004-07-21 | 2006-09-12 | Fairchild Semiconductor Corporation | High voltage integrated circuit driver with a high voltage PMOS bootstrap diode emulator |
| US7557515B2 (en) * | 2006-06-28 | 2009-07-07 | International Rectifier Corporation | Simplified ballast control circuit |
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2013
- 2013-04-18 CN CN201310136113.XA patent/CN103199689B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1682575A (en) * | 2002-07-09 | 2005-10-12 | 国际整流器公司 | Adaptive ballast control IC |
| CN1914787A (en) * | 2004-01-28 | 2007-02-14 | 株式会社瑞萨科技 | Switching power supply and semiconductor integrated circuit |
| CN101529716A (en) * | 2006-10-20 | 2009-09-09 | Nxp股份有限公司 | Power amplifier |
| CN101483353A (en) * | 2009-02-05 | 2009-07-15 | 中国航天时代电子公司第七七一研究所 | Buck type auxiliary electric power controlled by PFM |
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