CN204518162U - A kind of charge pump type LED drive chip - Google Patents
A kind of charge pump type LED drive chip Download PDFInfo
- Publication number
- CN204518162U CN204518162U CN201520211381.8U CN201520211381U CN204518162U CN 204518162 U CN204518162 U CN 204518162U CN 201520211381 U CN201520211381 U CN 201520211381U CN 204518162 U CN204518162 U CN 204518162U
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a kind of charge pump type LED drive chip.A kind of charge pump type LED drive chip comprises enable control circuit, band-gap reference circuit, pierce circuit, soft starting circuit, protective circuit, error amplifier, control logic, drive circuit and charge pump circuit.The conversion efficiency of the application circuit of the charge pump type LED drive chip composition utilizing the utility model to provide can up to about 96%, and the charge pump of employing is 2 times of boosting charge pumps.
Description
Technical field
The utility model relates to integrated circuit technique, refers more particularly to a kind of charge pump type LED drive chip.
Background technology
Based on needs, devise a kind of charge pump type LED drive chip.
Summary of the invention
The utility model aims to provide a kind of charge pump type LED drive chip.
A kind of charge pump type LED drive chip, comprises enable control circuit, band-gap reference circuit, pierce circuit, soft starting circuit, protective circuit, error amplifier, control logic, drive circuit and charge pump circuit:
The input termination Enable Pin EN of described enable control circuit, output controls described control logic; When Enable Pin EN connects high level, circuit normally works; When EN ground connection, circuit is in closed condition, and circuit does not work;
Described band-gap reference circuit is used for producing the bandgap voltage reference of chip internal, and as the reference voltage of other circuit, the accuracy of these voltages directly affects the voltage accuracy of output;
Described pierce circuit provides internal clock frequencies 1MHz, and as internal synchronizing clock;
When described soft starting circuit is used for avoiding chip enable, inrush current is excessive;
Described protective circuit has overcurrent protection, short-circuit protection function; Play the function of overcurrent and short-circuit protection respectively;
The difference of output voltage VO UT and reference voltage 0.8V carries out amplifying and feeding back by described error amplifier, ensures precision of voltage regulation during stable state;
Described control logic is according to external sampling and external feedback signal, controls the unlatching of circuit and shutoff; By digital circuit, generate the square wave of non-overlapping, for switch tube driving circuit provides control signal;
Described drive circuit input control signal is converted to the control signal with larger driving force by inner large scale metal-oxide-semiconductor, is used for controlling the shutoff of charge pump switches pipe;
Described charge pump circuit adopts 2 times of boosted charge pump configurations, comprises the power switch pipe controlling charge pump charging.
Operation principle: enable control determines whether whole chip works; When EN signal is high level, chip is in normal operating conditions; After now adding input voltage, chip starts to start, and soft-start module starts to work.During beginning, soft-start module is limited in high potential by output signal the grid potential of current-limited power pipe, and the path that output is charged is in cut-off state; Therefore at this moment input does not charge to output.After the time delay of tens microseconds, input voltage and band-gap reference current potential are stablized gradually, and input and output connect, output voltage starts to rise, now soft start controls at suitable current potential, makes the electric current flowing through input not be very large, avoids the appearance of surge current; When output voltage rises to about 1V, the switching tube controlling charge pump is started working on off state, and frequency is 1MHz.The signal that oscillator generates, through logic control and drive circuit, generates drive singal and controls charge pump switches pipe.After this input is by charge pump constantly to output charging, and the speed of charging depends on output capacitor and input current.By the time, after output is elevated to burning voltage 5V, soft start terminates automatically; Now error amplifier output signal controls, and makes output voltage stabilization at 5V.
When a short circuit occurs, output voltage can drop to very low value, and now short-circuit protection circuit is started working, and makes the electric current flowing through current-limited power pipe only have tens milliamperes, thus reaches the object of short-circuit protection.
The charge pump that this chip adopts is 2 times of boosting charge pumps.Input voltage is lower, and the difference of 2VIN-VOUT is less; VIN is minimum when being 2.7V, and VOUT is 5V; Like this when charging to output with charge pump, energy loss is less, and conversion efficiency is higher; Otherwise VIN is higher, energy loss is larger, and conversion efficiency is lower.Take into account this situation when design chips, when VIN reaches 5V, adopt straight mold filling formula, allow charge pump quit work, such conversion efficiency can up to about 96%.
This chip adopts 2 times of boosted charge pump configurations, greatly can improve conversion efficiency, when input voltage is at 5V, and also can forward conduction LED without the need to boosting; When cell voltage is lower than 5V, do 2 times of boosting inverters to input voltage, this structure saves the energy loss that boosting inverter causes as far as possible.
Accompanying drawing explanation
Fig. 1 is the internal circuit diagram of a kind of charge pump type LED drive chip of the present utility model.
When Fig. 2 is the input voltage 2.7 ~ 5V utilizing charge pump type LED drive chip of the present utility model, output voltage is the application circuit of 5V.
Embodiment
Below in conjunction with accompanying drawing, the utility model content is further illustrated.
A kind of charge pump type LED drive chip, as shown in Figure 1, comprises enable control circuit, band-gap reference circuit, pierce circuit, soft starting circuit, protective circuit, error amplifier, control logic, drive circuit and charge pump circuit:
The input termination Enable Pin EN of described enable control circuit, output controls described control logic; When Enable Pin EN connects high level, circuit normally works; When EN ground connection, circuit is in closed condition, and circuit does not work;
Described band-gap reference circuit is used for producing the bandgap voltage reference of chip internal, and as the reference voltage of other circuit, the accuracy of these voltages directly affects the voltage accuracy of output;
Described pierce circuit provides internal clock frequencies 1MHz, and as internal synchronizing clock;
When described soft starting circuit is used for avoiding chip enable, inrush current is excessive;
Described protective circuit has overcurrent protection, short-circuit protection function; Play the function of overcurrent and short-circuit protection respectively;
The difference of output voltage VO UT and reference voltage 0.8V carries out amplifying and feeding back by described error amplifier, ensures precision of voltage regulation during stable state;
Described control logic is according to external sampling and external feedback signal, controls the unlatching of circuit and shutoff; By digital circuit, generate the square wave of non-overlapping, for switch tube driving circuit provides control signal;
Described drive circuit input control signal is converted to the control signal with larger driving force by inner large scale metal-oxide-semiconductor, is used for controlling the shutoff of charge pump switches pipe;
Described charge pump circuit adopts 2 times of boosted charge pump configurations, comprises the power switch pipe controlling charge pump charging.
Operation principle: enable control determines whether whole chip works; When EN signal is high level, chip is in normal operating conditions; After now adding input voltage, chip starts to start, and soft-start module starts to work.During beginning, soft-start module is limited in high potential by output signal the grid potential of current-limited power pipe, and the path that output is charged is in cut-off state; Therefore at this moment input does not charge to output.After the time delay of tens microseconds, input voltage and band-gap reference current potential are stablized gradually, and input and output connect, output voltage starts to rise, now soft start controls at suitable current potential, makes the electric current flowing through input not be very large, avoids the appearance of surge current; When output voltage rises to about 1V, the switching tube controlling charge pump is started working on off state, and frequency is 1MHz.The signal that oscillator generates, through logic control and drive circuit, generates drive singal and controls charge pump switches pipe.After this input is by charge pump constantly to output charging, and the speed of charging depends on output capacitor and input current.By the time, after output is elevated to burning voltage 5V, soft start terminates automatically; Now error amplifier output signal controls, and makes output voltage stabilization at 5V.
When a short circuit occurs, output voltage can drop to very low value, and now short-circuit protection circuit is started working, and makes the electric current flowing through current-limited power pipe only have tens milliamperes, thus reaches the object of short-circuit protection.
The charge pump that this chip adopts is 2 times of boosting charge pumps.Input voltage is lower, and the difference of 2VIN-VOUT is less; VIN is minimum when being 2.7V, and VOUT is 5V; Like this when charging to output with charge pump, energy loss is less, and conversion efficiency is higher; Otherwise VIN is higher, energy loss is larger, and conversion efficiency is lower.Take into account this situation when design chips, when VIN reaches 5V, adopt straight mold filling formula, allow charge pump quit work, such conversion efficiency can up to about 96%.
When being illustrated in figure 2 the input voltage 2.7 ~ 5V utilizing charge pump type LED drive chip of the present utility model, output voltage is the application circuit of 5V.This chip adopts 2 times of boosted charge pump configurations, greatly can improve conversion efficiency, when input voltage is at 5V, and also can forward conduction LED without the need to boosting; When cell voltage is lower than 5V, do 2 times of boosting inverters to input voltage, this structure saves the energy loss that boosting inverter causes as far as possible.
Claims (1)
1. a charge pump type LED drive chip, is characterized in that, comprises enable control circuit, band-gap reference circuit, pierce circuit, soft starting circuit, protective circuit, error amplifier, control logic, drive circuit and charge pump circuit:
The input termination Enable Pin EN of described enable control circuit, output controls described control logic; When Enable Pin EN connects high level, circuit normally works; When EN ground connection, circuit is in closed condition, and circuit does not work;
Described band-gap reference circuit is used for producing the bandgap voltage reference of chip internal, and as the reference voltage of other circuit, the accuracy of these voltages directly affects the voltage accuracy of output;
Described pierce circuit provides internal clock frequencies 1MHz, and as internal synchronizing clock;
When described soft starting circuit is used for avoiding chip enable, inrush current is excessive;
Described protective circuit has overcurrent protection, short-circuit protection function; Play the function of overcurrent and short-circuit protection respectively;
The difference of output voltage VO UT and reference voltage 0.8V carries out amplifying and feeding back by described error amplifier, ensures precision of voltage regulation during stable state;
Described control logic is according to external sampling and external feedback signal, controls the unlatching of circuit and shutoff; By digital circuit, generate the square wave of non-overlapping, for switch tube driving circuit provides control signal;
Described drive circuit input control signal is converted to the control signal with larger driving force by inner large scale metal-oxide-semiconductor, is used for controlling the shutoff of charge pump switches pipe;
Described charge pump circuit adopts 2 times of boosted charge pump configurations, comprises the power switch pipe controlling charge pump charging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520211381.8U CN204518162U (en) | 2015-04-09 | 2015-04-09 | A kind of charge pump type LED drive chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520211381.8U CN204518162U (en) | 2015-04-09 | 2015-04-09 | A kind of charge pump type LED drive chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204518162U true CN204518162U (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520211381.8U Expired - Fee Related CN204518162U (en) | 2015-04-09 | 2015-04-09 | A kind of charge pump type LED drive chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204518162U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921902A (en) * | 2017-03-14 | 2017-07-04 | 无锡纳瓦特电子有限公司 | A kind of Earphone Amplifier with turn-off function OCL output capacitance-less |
| CN111869038A (en) * | 2019-02-28 | 2020-10-30 | Oppo广东移动通信有限公司 | Charging circuit and method for electronic device, and storage medium |
| CN113608569A (en) * | 2021-08-05 | 2021-11-05 | 广东合科泰实业有限公司 | Display screen driving IC |
-
2015
- 2015-04-09 CN CN201520211381.8U patent/CN204518162U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921902A (en) * | 2017-03-14 | 2017-07-04 | 无锡纳瓦特电子有限公司 | A kind of Earphone Amplifier with turn-off function OCL output capacitance-less |
| CN111869038A (en) * | 2019-02-28 | 2020-10-30 | Oppo广东移动通信有限公司 | Charging circuit and method for electronic device, and storage medium |
| CN111869038B (en) * | 2019-02-28 | 2021-06-04 | Oppo广东移动通信有限公司 | Charging circuit and method for electronic device, and storage medium |
| US11502535B2 (en) | 2019-02-28 | 2022-11-15 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging circuit for electronic device, charging method, and electronic device |
| CN113608569A (en) * | 2021-08-05 | 2021-11-05 | 广东合科泰实业有限公司 | Display screen driving IC |
| CN113608569B (en) * | 2021-08-05 | 2022-09-16 | 广东合科泰实业有限公司 | Display screen driving IC |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 Termination date: 20160409 |
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| CF01 | Termination of patent right due to non-payment of annual fee |