CN108260244A - The method that great power LED constant-current driven chip is made to adapt to input voltage variation - Google Patents
The method that great power LED constant-current driven chip is made to adapt to input voltage variation Download PDFInfo
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- CN108260244A CN108260244A CN201611238590.7A CN201611238590A CN108260244A CN 108260244 A CN108260244 A CN 108260244A CN 201611238590 A CN201611238590 A CN 201611238590A CN 108260244 A CN108260244 A CN 108260244A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- 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]
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Abstract
The method that great power LED constant-current driven chip is made to adapt to input voltage variation.Traditional die typical case scheme input voltage amplitude of variation is no more than ± 10%, if it exceeds the range, output current trueness error will dramatically increase.The method that great power LED constant-current driven chip is made to adapt to input voltage variation, after input voltage VIN is connected, voltage regulator high pressure LDO starts to work, and the power supply VOUT of 5 V is provided for analog control circuit part.When under-voltage latch units (UVLO) monitor that the output of LDO reaches 4 V,It can be to biasing circuit module,Overheating protection circuit module,Logic control circuit modules and drive circuit module send out enable signal (EN),Chip whole system is started to work at this time,Built-in NLDMOS power devices M1 conductings,The electric current of inductance L is begun to ramp up,Since the electric current on sampling resistor RSNS is equal to the electric current on inductance L,After the electric current flows through feedback resistance RSNS,Generate a feedback voltage V SNS,VSNS can feed back to chip interior by Vfb pins,And a reference voltage Vref generated by chip interior benchmark can be generated in Vfb pins (design chips are 200 mV),Feedback voltage V SNS and reference voltage Vref can be compared by the comparator in chip at this time,If feedback voltage V SNS is less than reference voltage Vref,So chip can make internal NLDMOS conductings,The time TON of conducting is determined by the resistance RON and input voltage VIN being connected with clt pins.After turn-on time TON, NLDMOS can turn off a time, this time is referred to as minimum turn-off time TOFF MIN (the chip minimum turn-off time of design is 200 ns).After minimum turn-off time TOFF MIN terminate, chip is compared VSNS and reference voltage Vref, if VSNS is less than Vref, M1 conductings start cycle operation next time, compare the size between feedback voltage V SNS and reference voltage Vref again.The present invention adapts to for the external environment of great power LED constant-current driven chip.
Description
Technical field：
The present invention relates to a kind of methods that great power LED constant-current driven chip is made to adapt to input voltage variation.
Background technology：
LED is by energy consumption is low, luminous efficiency is high, environmentally friendly, service life is long, numerous advantages such as safe and reliable are in lighting area
Obtain one seat, and have ever-expanding trend, similary LED Lighting Industries also bring very significant economic benefit and
Social benefit.Therefore, the rapid proliferation of LED illumination has also driven flourishing for LED drive chip industry so that LED drives
Chip has become the important component in electric power management circuit market.Due to LED illumination brightness and its conducting electric current it is strong
Spend it is closely related, constant current driving be optimal selection.And the typical case scheme of traditional chip changes width to input voltage
It spends more demanding, is usually no more than ± 10%, if input voltage amplitude of variation is more than this range, output current trueness error
It will dramatically increase, so designing a kind of great power LED constant-current driven chip on the basis of traditional die to adapt to input voltage
Variation.
Invention content：
The object of the present invention is to provide a kind of methods that great power LED constant-current driven chip is made to adapt to input voltage variation.
Above-mentioned purpose is realized by following technical scheme：
A kind of method that great power LED constant-current driven chip is made to adapt to input voltage variation, after input voltage VIN is connected, electricity
Adjuster high pressure LDO is pressed to start to work, the power supply VOUT of 5 V is provided for analog control circuit part.When under-voltage latch units
It (UVLO), can be to biasing circuit module, overheating protection circuit module, logic control circuit when monitoring that the output of LDO reaches 4 V
Module and drive circuit module send out enable signal (EN), and chip whole system is started to work at this time, built-in NLDMOS power devices
Part M1 is connected, and the electric current of inductance L is begun to ramp up, since the electric current on sampling resistor RSNS is equal to the electric current on inductance L, the electric current
After flowing through feedback resistance RSNS, chip interior can be fed back to by Vfb pins by generating feedback voltage V a SNS, VSNS, and Vfb
A reference voltage Vref generated by chip interior benchmark (design chips are 200 mV) can be generated in pin, at this time in chip
Comparator feedback voltage V SNS and reference voltage Vref can be compared, if feedback voltage V SNS be less than reference voltage
Vref, then chip can make internal NLDMOS conductings, and the time TON of conducting is resistance RON by being connected with clt pins and defeated
Enter what voltage VIN was determined.After turn-on time TON, NLDMOS can turn off a time, this time is referred to as minimum
Turn-off time TOFF-MIN (the chip minimum turn-off time of design is 200 ns).Minimum turn-off time TOFF-MIN terminate with
Afterwards, chip is compared VSNS and reference voltage Vref, if VSNS is less than Vref, M1 conductings start cycle next time
Work, compares the size between feedback voltage V SNS and reference voltage Vref again.In addition, when NLDMOS is connected, if outside
Element such as value of resistance RON and inductance L in portion's is inappropriate, such as resistance RON is excessive or inductance L is too small, so as to cause on Vfb
Voltage drop be more than 300 mV, being connected to the output state signal of another comparator at Vfb ends at this time can overturn, force
NLDMOS is turned off, and chip is stopped, and the chip shares 8 pins, important pin have input pin VIN, switch foot SW,
Drive module the floating power supply foot VCC and grounding leg VSS of power NLDMOS.Supply pin VCC and switch foot in chip application
A capacitance is connected between SW, therefore, the pad of supply pin VCC is disposed close to the place of switch foot SW.In addition chip
Surrounding is all ground wire, and being mainly in view of grounding leg VSS to the design that grounding leg VSS pads are placed needs close to voltage reference source
Module, the placements of other pin pads are mainly considered from saving chip area.
Described makes the method that great power LED constant-current driven chip adapts to input voltage variation, logic control electricity
Road turns respectively with turn-on time control circuit, minimum turn-off time circuit, under-voltage protecting circuit, TSD overheating protection circuits, level
Circuit, the connection of current limliting timer are changed, the level shifting circuit is connect with gate driving under-voltage protecting circuit, the current limliting
Timer is connect with BUCK switching current detection circuits, the gate driving under-voltage protecting circuit and voltage regulator high pressure
LDO connections, the BUCK switching currents detection circuit respectively with the level shifting circuit, the gate driving is under-voltage
Protect circuit, the voltage regulator high pressure LDO connections.
Beneficial effects of the present invention：
1. the present invention is DC/DC voltage-dropping type LED constant current driving chips, wide input voltage range, reach 6 V to 45 V, export
Forward current reaches as high as 1.5 A, can meet most of DC application, can make to flow through the series connection no more than maximum output voltage
The electric current of LED is stablized.Using sluggish control model, using the not mutability of inductive current in Buck circuits, by sampling electricity
The feedback voltage of resistance and the reference voltage of chip interior are compared, and output voltage conducting are controlled to close by internal switch mosfet
It closes, so as to fulfill the purpose of constant current, constant current driving is carried out to LED.This chip has that reference voltage is low, transient response pole simultaneously
Soon, the characteristics of digital (PWM) light modulation, UVLO under-voltage protections, overheating protection.Control mode of this chip based on control turn-on time
High-precision is realized, and there is wide input voltage range, low reference voltage source and PWM light modulations etc., driving current can reach
1.5 A, and just being capable of steady operation without compensation.
In Fig. 2, it is added to R1 and R2 resistance respectively in VIN ports and Vjb ports, wherein R1 is big resistance, designs resistance value
Larger, R2 is low resistance, and design resistance value is smaller.When input voltage VIN increase, feedback voltage V CS2 is consequently increased, this will rise
Counteracting output current increases and increased effect with input voltage, as long as so big resistance R1 and low resistance R2 choose it is suitable,
The relationship of output current IF and input voltage VIN can be seen that just by the mathematical relationship between the R1 on R2 and denominator on molecule
Become very little, it might even be possible to ignore.Solves the driving of chip typical case using the LED drive schemes of the present invention
The problem of circuit input voltage amplitude of variation can only be limited in ± 10% allows input voltage amplitude of variation to reach ± 50% even
More, the function of the chip is significantly improved, has further widened the chip application range.
Description of the drawings：
Attached drawing 1 is the circuit diagram of the present invention.
Attached drawing 2 is the circuit diagram using this great power LED constant-current driven chip and method driving LED.
Specific embodiment：
Embodiment 1：
The method that great power LED constant-current driven chip is made to adapt to input voltage variation, after input voltage VIN is connected, voltage tune
It saves device high pressure LDO to start to work, the power supply VOUT of 5 V is provided for analog control circuit part.As under-voltage latch units (UVLO)
When monitoring that the output of LDO reaches 4 V, can to biasing circuit module, overheating protection circuit module, logic control circuit modules and
Drive circuit module sends out enable signal (EN), and chip whole system is started to work at this time, and built-in NLDMOS power devices M1 is led
Logical, the electric current of inductance L is begun to ramp up, and since the electric current on sampling resistor RSNS is equal to the electric current on inductance L, which flows through instead
After feed resistance RSNS, chip interior can be fed back to by Vfb pins by generating feedback voltage V a SNS, VSNS, and in Vfb pins
A reference voltage Vref generated by chip interior benchmark (design chips are 200 mV), the at this time comparison in chip can be generated
Feedback voltage V SNS and reference voltage Vref can be compared by device, if feedback voltage V SNS is less than reference voltage Vref, that
Chip can make internal NLDMOS conductings, and the time TON of conducting is resistance RON and input voltage by being connected with clt pins
What VIN was determined.After turn-on time TON, NLDMOS can turn off a time, when this time is referred to as minimum turn-off
Between TOFF-MIN (the chip minimum turn-off time of design be 200 ns).After minimum turn-off time TOFF-MIN terminates, chip
VSNS and reference voltage Vref are compared, if VSNS is less than Vref, M1 conductings start cycle operation next time, then
Secondary size relatively between feedback voltage V SNS and reference voltage Vref.In addition, when NLDMOS is connected, if outer member is such as
The value of resistance RON and inductance L are inappropriate, such as resistance RON is excessive or inductance L is too small, so as to cause the voltage drop on Vfb
More than 300 mV, being connected to the output state signal of another comparator at Vfb ends at this time can overturn, and NLDMOS is forced to close
Disconnected, chip is stopped.
This chip shares 8 pins, and important pin has the drive module of input pin VIN, switch foot SW, power NLDMOS
Floating power supply foot VCC and grounding leg VSS.A capacitance is connected between supply pin VCC and switch foot SW in chip application,
Therefore, the pad of supply pin VCC is disposed close to the place of switch foot SW.In addition all it is ground wire around chip, to ground connection
The design that foot VSS pads are placed, which is mainly in view of grounding leg VSS, to be needed close to Voltage Reference source module, other pin pads are put
It puts and mainly considers from chip area is saved.
Embodiment 2：
The method that great power LED constant-current driven chip is made to adapt to input voltage variation：The logic control circuit 1 is respectively with leading
Logical time control circuit 2, minimum turn-off time circuit 3, under-voltage protecting circuit 4, TSD overheating protection circuits 5, level shifting circuit
6th, current limliting timer 7 connects, and the level shifting circuit is connect with gate driving under-voltage protecting circuit 8, and the current limliting is determined
When device connect with BUCK switching currents detection circuit 9, the gate driving under-voltage protecting circuit and voltage regulator high pressure
LDO, piece number：10 connection, the BUCK switching currents detection circuit respectively with the level shifting circuit, the grid
Drive under-voltage protecting circuit, the voltage regulator high pressure LDO connections.
Claims (2)
1. a kind of method that great power LED constant-current driven chip is made to adapt to input voltage variation, it is characterized in that：Work as input voltage
After VIN is connected, voltage regulator high pressure LDO starts to work, and the power supply VOUT of 5 V is provided for analog control circuit part.When deficient
When pressure latch units (UVLO) monitor that the output of LDO reaches 4 V, understand to biasing circuit module, overheating protection circuit module, patrol
It collects control circuit module and drive circuit module sends out enable signal (EN), chip whole system is started to work at this time, built-in
NLDMOS power devices M1 is connected, and the electric current of inductance L is begun to ramp up, since the electric current on sampling resistor RSNS is equal on inductance L
Electric current, after which flows through feedback resistance RSNS, generate feedback voltage V a SNS, VSNS can be fed back to by Vfb pins
Chip interior, and the reference voltage Vref generated by chip interior benchmark (design chips 200 can be generated in Vfb pins
MV), feedback voltage V SNS and reference voltage Vref can be compared by the comparator in chip at this time, if feedback voltage V SNS
Less than reference voltage Vref, then chip can make internal NLDMOS conductings, and the time TON of conducting is by being connected with clt pins
Resistance RON and input voltage VIN determined.After turn-on time TON, NLDMOS can turn off a time, this
Time is referred to as minimum turn-off time TOFF-MIN (the chip minimum turn-off time of design is 200 ns).The minimum turn-off time
After TOFF-MIN terminates, chip is compared VSNS and reference voltage Vref, if VSNS is less than Vref, M1 conductings are opened
The cycle operation to begin next time, compares the size between feedback voltage V SNS and reference voltage Vref again.In addition, work as NLDMOS
During conducting, if the outer member such as value of resistance RON and inductance L is inappropriate, such as resistance RON is excessive or inductance L is too small,
It is more than 300 mV so as to cause the voltage drop on Vfb, is connected to the output state signal of another comparator at Vfb ends at this time
It can overturn, force NLDMOS shutdowns, chip is stopped, and the chip shares 8 pins, and important pin has input pin
VIN, drive module the floating power supply foot VCC and grounding leg VSS for switching foot SW, power NLDMOS.The power supply in chip application
A capacitance is connected between foot VCC and switch foot SW, therefore, the pad of supply pin VCC is disposed close to switch foot SW's
Place.In addition all it is ground wire around chip, the design placed to grounding leg VSS pads is mainly in view of grounding leg VSS needs
Close to Voltage Reference source module, the placements of other pin pads mainly considers from chip area is saved.
2. the method according to claim 1 that great power LED constant-current driven chip is made to adapt to input voltage variation, feature
It is：
The logic control circuit respectively with turn-on time control circuit, minimum turn-off time circuit, under-voltage protecting circuit,
TSD overheating protection circuits, level shifting circuit, the connection of current limliting timer, the level shifting circuit and gate driving are under-voltage
Circuit connection is protected, the current limliting timer connect with BUCK switching current detection circuits, the gate driving is under-voltage guarantor
Protection circuit is connect with voltage regulator high pressure LDO, the BUCK switching currents detection circuit respectively with the level conversion
Circuit, the gate driving under-voltage protecting circuit, the voltage regulator high pressure LDO connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238590.7A CN108260244A (en) | 2016-12-28 | 2016-12-28 | The method that great power LED constant-current driven chip is made to adapt to input voltage variation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238590.7A CN108260244A (en) | 2016-12-28 | 2016-12-28 | The method that great power LED constant-current driven chip is made to adapt to input voltage variation |
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| Publication Number | Publication Date |
|---|---|
| CN108260244A true CN108260244A (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611238590.7A Pending CN108260244A (en) | 2016-12-28 | 2016-12-28 | The method that great power LED constant-current driven chip is made to adapt to input voltage variation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601683A (en) * | 2019-08-19 | 2019-12-20 | 麦歌恩电子(上海)有限公司 | Switch control circuit and control method |
| CN112218410A (en) * | 2019-09-19 | 2021-01-12 | 浙江大学 | Alternating current direct-connected LED driving chip with high output power and low stroboscopic effect and device |
| CN115167606A (en) * | 2022-06-22 | 2022-10-11 | 清华大学 | Drive chip of turn-off device and control method thereof |
| CN116403517A (en) * | 2023-06-09 | 2023-07-07 | 中科(深圳)无线半导体有限公司 | Self-adaptive control method for power source of LED display system |
-
2016
- 2016-12-28 CN CN201611238590.7A patent/CN108260244A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601683A (en) * | 2019-08-19 | 2019-12-20 | 麦歌恩电子(上海)有限公司 | Switch control circuit and control method |
| CN110601683B (en) * | 2019-08-19 | 2023-02-10 | 麦歌恩电子(上海)有限公司 | Switch control circuit and control method |
| CN112218410A (en) * | 2019-09-19 | 2021-01-12 | 浙江大学 | Alternating current direct-connected LED driving chip with high output power and low stroboscopic effect and device |
| CN115167606A (en) * | 2022-06-22 | 2022-10-11 | 清华大学 | Drive chip of turn-off device and control method thereof |
| CN116403517A (en) * | 2023-06-09 | 2023-07-07 | 中科(深圳)无线半导体有限公司 | Self-adaptive control method for power source of LED display system |
| CN116403517B (en) * | 2023-06-09 | 2023-08-29 | 中科(深圳)无线半导体有限公司 | Self-adaptive control method for power source of LED display system |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180706 |
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| WD01 | Invention patent application deemed withdrawn after publication |