CN205830106U - A kind of constant-current LED driving chip - Google Patents
A kind of constant-current LED driving chip Download PDFInfo
- Publication number
- CN205830106U CN205830106U CN201620754268.9U CN201620754268U CN205830106U CN 205830106 U CN205830106 U CN 205830106U CN 201620754268 U CN201620754268 U CN 201620754268U CN 205830106 U CN205830106 U CN 205830106U
- Authority
- CN
- China
- Prior art keywords
- pwm
- module
- connects
- outfan
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model discloses a kind of constant-current LED driving chip; including: Logic control module, band-gap reference module, PWM light-adjusting module, error amplifier, PWM comparator, overcurrent protection comparator, current sample amplifier, under-voltage protective module, overheat protector module, power MOS pipe and sampling resistor, also include VCC end, PWM end, VFB end, SW end and GND end.Constant-current LED driving chip of the present utility model provides constant-current driving and PWM dimming control function; and there is overcurrent protection, current detecting, under-voltage protection and overheat protector function; the most whole loop is one-pole system, therefore needs not compensate for circuit and is to ensure that the stability of system.
Description
Technical field
This utility model relates to a kind of constant-current LED driving chip.
Background technology
LED lamp, with high efficiency, high integration and the advantage of high life, obtains the most widely should at lighting field
With.Compared with conventional bulb, it photochromic soft, the most dazzling, without insalubrious materials such as sodium, safety is high.Along with
The gradually maturation of White light LED technology, semiconductor illumination technique can be applied not only to white light general illumination, the most a lot of at other
Aspect have also been obtained and is widely applied, such as the instruction all kinds of vehicles such as light source, decorative lighting, automobile of various instrument and meters
Illumination, traffic signal show, background shows, electronic curtain, military illumination and tourism, light industrial products etc..Therefore, in order to more preferably
More safely control LED, it is necessary to a kind of constant-current LED driving chip of design.
Utility model content
In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of constant-current LED driving chip, its
Stability and protectiveness can be provided for LED drive chip, and constant-current driving and brightness adjustment control are provided.
The purpose of this utility model realizes by the following technical solutions:
A kind of constant-current LED driving chip, including: Logic control module, band-gap reference module, PWM light-adjusting module, error are put
Big device, PWM comparator, overcurrent protection comparator, current sample amplifier, under-voltage protective module, overheat protector module, power
Metal-oxide-semiconductor and sampling resistor, also include VCC end, PWM end, VFB end, SW end and GND end；
The input of described band-gap reference module connects VCC end, and the outfan of band-gap reference module connects PWM light-adjusting module
Input, the control end of PWM light-adjusting module is connected with PWM end, the outfan of PWM light-adjusting module and the positive of error amplifier
End connects, and the end of oppisite phase of error amplifier connects VFB end, and the outfan of error amplifier connects the end of oppisite phase of PWM comparator,
The positive terminal of PWM comparator connects the outfan of current sample amplifier, and current ratio connects compared with the positive terminal of sampling amplifier to be adopted
One end of sample resistance, current ratio connects the other end of sampling resistor compared with the end of oppisite phase of sampling amplifier, and one end of sampling resistor is even
Connecing the source electrode of power MOS pipe, the other end of sampling resistor connects GND end, and the grid of power MOS pipe is with Logic control module even
Connecing, the drain electrode of power MOS pipe is connected with SW end, and the positive terminal of overcurrent protection comparator is connected with the source electrode of power MOS pipe, crosses stream
The end of oppisite phase of protection comparator is connected with VCC end；Under-voltage protective module and overheat protector module are respectively with Logic control module even
Connect.
Preferably, described power MOS pipe is NMOS tube.
Preferably, described PWM light-adjusting module includes transmission gate, phase inverter and switching tube, described band-gap reference module defeated
Going out end to be connected with the input of transmission gate, the outfan of transmission gate is connected with the positive terminal of error amplifier, the input of phase inverter
First control end of end and transmission gate is connected with PWM end respectively, the second of transmission gate control the grid of end and switching tube respectively with
The outfan of phase inverter connects, and the drain electrode of switching tube is connected with the positive terminal of error amplifier, the source ground of switching tube.
Compared to existing technology, the beneficial effects of the utility model are:
This constant-current LED driving chip provides constant-current driving and PWM dimming control function, and has overcurrent protection, electricity
Stream detection, under-voltage protection and overheat protector function, the most whole loop is one-pole system, therefore needs not compensate for circuit with regard to energy
Enough ensure the stability of system.
Accompanying drawing explanation
Fig. 1 is structure chart and the application circuit of constant-current LED driving chip of the present utility model；
Fig. 2 is the circuit structure diagram of PWM light adjusting circuit of the present utility model.
Detailed description of the invention
Below, in conjunction with accompanying drawing and detailed description of the invention, this utility model is described further:
With reference to Fig. 1 and Fig. 2, a kind of constant-current LED driving chip, including: Logic control module 1, band-gap reference module 2, mistake
Difference amplifier 3, PWM comparator 4, overcurrent protection comparator 6, current sample amplifier 7, under-voltage protective module 8, PWM dim mould
Block 9, overheat protector module 10, power MOS pipe and sampling resistor Rsense, also include VCC end, PWM end, VFB end, SW end and
GND end.Wherein, power MOS pipe is NMOS tube.
The input of band-gap reference module 2 connects VCC end, and the outfan of band-gap reference module 2 connects PWM light-adjusting module 9
Input, the control end of PWM light-adjusting module 9 is connected with PWM end, the outfan of PWM light-adjusting module 9 and error amplifier 3
Positive terminal connects, and the end of oppisite phase of error amplifier 3 connects VFB end, and the outfan of error amplifier 3 connects the anti-of PWM comparator 4
The positive terminal of Xiang Duan, PWM comparator 4 connects the outfan of current sample amplifier 7, and current ratio is compared with the positive of sampling amplifier 7
End connects one end of sampling resistor Rsense, and current ratio connects the another of sampling resistor Rsense compared with the end of oppisite phase of sampling amplifier 7
One end, one end of sampling resistor Rsense connects the source electrode of power MOS pipe, and the other end of sampling resistor Rsense connects GND end,
The grid of power MOS pipe is connected with Logic control module 1, and the drain electrode of power MOS pipe is connected with SW end, overcurrent protection comparator 6
Positive terminal be connected with the source electrode of power MOS pipe, the end of oppisite phase of overcurrent protection comparator 6 is connected with VCC end.Under-voltage protective module
8 and overheat protector module 10 be connected with Logic control module 1 respectively.
PWM light-adjusting module 9 includes transmission gate TG, phase inverter A1 and switching tube M1, the outfan of band-gap reference module 2 and biography
The input of defeated door TG connects, and the outfan of transmission gate TG is connected with the positive terminal of error amplifier 3, the input of phase inverter A1
Being connected with PWM end respectively with the first control end of transmission gate TG, the second control end of transmission gate TG and the grid of switching tube M1 divide
Not being connected with the outfan of phase inverter A1, the drain electrode of switching tube M1 is connected with the positive terminal of error amplifier 3, the source of switching tube M1
Pole ground connection.Wherein, switching tube M1 is PMOS switch pipe, and the first control end of transmission gate TG is the grid of PMOS, transmission gate TG
Second control end be the grid of NMOS tube.
Wherein, band-gap reference module 2 produces the bandgap voltage reference within driving chip, as the ginseng of other circuit modules
Examining voltage, the feedback voltage that error amplifier 3 feeds back to from VFB end compares with reference voltage, its difference is amplified and goes forward side by side
Row feedback, the precision of voltage regulation in time ensureing stable state, the voltage error signal that error amplifier 3 is exported by PWM comparator 4 with adopt
Sample signal compares, and exports corresponding pulse-width signal, controls the dutycycle of power MOS pipe, thus reaches regulation output
The purpose of voltage, the voltage signal on sampling resistor Rsense is amplified by current sample amplifier 7, and output sampled signal is extremely
In PWM comparator 4.When circuit just starts to start, the voltage of VFB end is the lowest, and the output of error amplifier 3 is very big, such merit
Rate metal-oxide-semiconductor can be constantly on, causes damaging device, in order to avoid this phenomenon, the electricity that will obtain on sampling resistor Rsense
Pressure signal accesses the positive terminal of overcurrent protection comparator 6, thus controls the dutycycle of power MOS pipe；Logic control module 1 realizes
The logic control function of system, and control the duty of power MOS pipe.VCC voltage is adopted by under-voltage protective module 8
Sample, and compare with a vdd voltage, vdd voltage can be for reference voltage produced by band-gap reference module 2, when VCC voltage
Occur under-voltage abnormal time, corresponding voltage signal can be sent to Logic control module 1, it is achieved under-voltage protection function.When chip temperature
Spending height, overheat protector module 10 can send corresponding voltage signal to Logic control module 1, it is achieved overheat protector function.
For PWM light-adjusting module, the PWM end external world adjustable square wave of dutycycle, when the square wave of input is in high level, pass
Defeated door TG turns off, and switching tube M1 turns on, the positive terminal ground connection of error amplifier 3；When the square wave of input is in low level, transmission
Door TG conducting, switching tube M1 disconnects, voltage on the basis of the positive terminal of error amplifier 3.Therefore, by regulation PWM end input
The dutycycle of square wave, changes the output signal of error amplifier 3, and then the turn-on and turn-off time of control power MOS pipe, reaches
Change the purpose of the brightness of LED.
Constant-current LED driving chip of the present utility model provides constant-current driving and PWM dimming control function, and has
Stream protection, current detecting, under-voltage protection and overheat protector function, the most whole loop is one-pole system, therefore need not mend
Repay circuit and be to ensure that the stability of system.
It will be apparent to those skilled in the art that can technical scheme as described above and design, make other various
Corresponding change and deformation, and all these change and deformation all should belong to the protection of this utility model claim
Within the scope of.
Claims (3)
1. a constant-current LED driving chip, it is characterised in that including: Logic control module, band-gap reference module, PWM dim mould
Block, error amplifier, PWM comparator, overcurrent protection comparator, current sample amplifier, under-voltage protective module, overheat protector mould
Block, power MOS pipe and sampling resistor, also include VCC end, PWM end, VFB end, SW end and GND end；
The input of described band-gap reference module connects VCC end, and the outfan of band-gap reference module connects the defeated of PWM light-adjusting module
Entering end, the control end of PWM light-adjusting module is connected with PWM end, and the outfan of PWM light-adjusting module connects with the positive terminal of error amplifier
Connecing, the end of oppisite phase of error amplifier connects VFB end, and the outfan of error amplifier connects the end of oppisite phase of PWM comparator, PWM ratio
The positive terminal of relatively device connects the outfan of current sample amplifier, and current ratio connects sampling resistor compared with the positive terminal of sampling amplifier
One end, current ratio connects the other end of sampling resistor compared with the end of oppisite phase of sampling amplifier, and one end of sampling resistor connects power
The source electrode of metal-oxide-semiconductor, the other end of sampling resistor connects GND end, and the grid of power MOS pipe is connected with Logic control module, power
The drain electrode of metal-oxide-semiconductor is connected with SW end, and the positive terminal of overcurrent protection comparator is connected with the source electrode of power MOS pipe, overcurrent protection ratio
The end of oppisite phase of relatively device is connected with VCC end；Under-voltage protective module and overheat protector module are connected with Logic control module respectively.
Constant-current LED driving chip the most according to claim 1, it is characterised in that described power MOS pipe is NMOS tube.
Constant-current LED driving chip the most according to claim 1, it is characterised in that described PWM light-adjusting module includes transmission
Door, phase inverter and switching tube, the described outfan of band-gap reference module is connected with the input of transmission gate, the outfan of transmission gate
Being connected with the positive terminal of error amplifier, the input of phase inverter and the first control end of transmission gate are connected with PWM end respectively, pass
Second control end of defeated door and the grid of switching tube are connected with the outfan of phase inverter respectively, and the drain electrode of switching tube is amplified with error
The positive terminal of device connects, the source ground of switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620754268.9U CN205830106U (en) | 2016-07-15 | 2016-07-15 | A kind of constant-current LED driving chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620754268.9U CN205830106U (en) | 2016-07-15 | 2016-07-15 | A kind of constant-current LED driving chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205830106U true CN205830106U (en) | 2016-12-21 |
Family
ID=57562790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620754268.9U Active CN205830106U (en) | 2016-07-15 | 2016-07-15 | A kind of constant-current LED driving chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205830106U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793288A (en) * | 2016-12-15 | 2017-05-31 | 广东威创视讯科技股份有限公司 | Led drive circuit |
| CN106879121A (en) * | 2017-03-30 | 2017-06-20 | 横店集团得邦照明股份有限公司 | A kind of digital control constant current output drives change-over circuit and its implementation |
| CN107272808A (en) * | 2017-08-11 | 2017-10-20 | 何金昌 | A kind of LDO circuit applied to integrated chip |
| CN108541101A (en) * | 2018-04-10 | 2018-09-14 | 厦门元顺微电子技术有限公司 | The circuit structure of chip |
| CN112104348A (en) * | 2020-08-31 | 2020-12-18 | 深圳市优必选科技股份有限公司 | Protection circuit of MOS pipe |
| CN113056063A (en) * | 2021-03-31 | 2021-06-29 | 黄山市瑞兴汽车电子有限公司 | High-precision and high-reliability LED car lamp driving circuit |
| CN114879803A (en) * | 2022-05-24 | 2022-08-09 | 西安微电子技术研究所 | Current-limiting protection circuit structure of LDO (low dropout regulator) |
-
2016
- 2016-07-15 CN CN201620754268.9U patent/CN205830106U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793288A (en) * | 2016-12-15 | 2017-05-31 | 广东威创视讯科技股份有限公司 | Led drive circuit |
| CN106879121A (en) * | 2017-03-30 | 2017-06-20 | 横店集团得邦照明股份有限公司 | A kind of digital control constant current output drives change-over circuit and its implementation |
| CN106879121B (en) * | 2017-03-30 | 2019-03-22 | 横店集团得邦照明股份有限公司 | A kind of digital control constant current output driving conversion circuit and its implementation |
| CN107272808A (en) * | 2017-08-11 | 2017-10-20 | 何金昌 | A kind of LDO circuit applied to integrated chip |
| CN107272808B (en) * | 2017-08-11 | 2019-01-29 | 泉州市天龙电子科技有限公司 | A kind of LDO circuit applied to integrated chip |
| CN108541101A (en) * | 2018-04-10 | 2018-09-14 | 厦门元顺微电子技术有限公司 | The circuit structure of chip |
| CN112104348A (en) * | 2020-08-31 | 2020-12-18 | 深圳市优必选科技股份有限公司 | Protection circuit of MOS pipe |
| CN113056063A (en) * | 2021-03-31 | 2021-06-29 | 黄山市瑞兴汽车电子有限公司 | High-precision and high-reliability LED car lamp driving circuit |
| CN113056063B (en) * | 2021-03-31 | 2024-02-23 | 黄山市瑞兴汽车电子有限公司 | High-precision high-reliability LED car lamp driving circuit |
| CN114879803A (en) * | 2022-05-24 | 2022-08-09 | 西安微电子技术研究所 | Current-limiting protection circuit structure of LDO (low dropout regulator) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205830106U (en) | A kind of constant-current LED driving chip | |
| CN106604448B (en) | A kind of light modulation toning control circuit and LED illumination product | |
| US8253342B2 (en) | Light emitting diode illumination system | |
| CN101959352A (en) | LED driving circuit with LED short-circuit protection | |
| CN103079322B (en) | Closed loop light-emitting diode (LED) current control circuit and power-switching circuit | |
| CN204031553U (en) | A kind of LED drive circuit and soft starting circuit thereof | |
| CN107734777A (en) | LED drive chip, LED drive circuit and LED light device | |
| CN105916239A (en) | Over-voltage adaptive regulation circuit for linear constant current driven LED | |
| US9814107B2 (en) | Drive circuit and illumination device comprising the drive circuit | |
| CN203757403U (en) | LED (Light Emitting Diode) candle lamp with incandescent light bulb dimming effect | |
| CN105792433B (en) | Switching Power Supply driving chip and controllable silicon light modulation LED drive circuit | |
| CN109302777B (en) | LED dimming device and dimming system | |
| CN104159365B (en) | Backlight circuit and backlight | |
| CN107666732B (en) | Control circuit and control method for high-power LED for vehicle | |
| KR101488682B1 (en) | Dimming control of led lighting circuits | |
| CN203590567U (en) | AC power supply-based LED drive circuit with function of automatic illumination intensity adjusting | |
| CN205611001U (en) | Linear constant current PWM optoelectronic isolation receiving terminal of high pressure | |
| CN203352865U (en) | LED dimming system | |
| CN209419956U (en) | LED dimming device and light adjusting system | |
| CN210118646U (en) | Plant lamp with variable spectrum | |
| CN106982492A (en) | A kind of light modulator with overload protecting circuit | |
| CN208623945U (en) | A kind of multiple-channel output dimming power source meeting U.S. rule CLASS2 | |
| CN208424857U (en) | A kind of RCC light adjusting circuit and luminaire | |
| CN205830107U (en) | A kind of LED drive chip | |
| CN104602387B (en) | Dummy load circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |