CN107087332A - A kind of LDO backlight drive circuits - Google Patents
A kind of LDO backlight drive circuits Download PDFInfo
- Publication number
- CN107087332A CN107087332A CN201710527993.1A CN201710527993A CN107087332A CN 107087332 A CN107087332 A CN 107087332A CN 201710527993 A CN201710527993 A CN 201710527993A CN 107087332 A CN107087332 A CN 107087332A
- Authority
- CN
- China
- Prior art keywords
- ldo
- electric capacity
- led load
- drive circuits
- backlight drive
- 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.)
- Pending
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Classifications
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The invention provides a kind of LDO backlight drive circuits, including direct-current input power supplying, anti-reverse diode, the first electric capacity, the second electric capacity, first resistor, second resistance, the first LED load, the second LED load and LDO chips.Circuit structure of the present invention is simple, and driving IC oneself power consumptions are relatively low, and usable single lithium battery is operated, and whole piece circuit cost is cheap, is suitably applied small volume and the LED flashlight of confined space.
Description
Technical field：
The present invention relates to a kind of electronic circuit, more particularly to a kind of LDO backlight drive circuits.
Background technology：
Battery is for white LED backlight drive circuit generally using two kinds of topological structures：The charge pump architecture of LED parallel configurations
Join the inductance boost type frame structure of configuration with LED strip.In actual production process, whether circuit structure is simple, driving IC itself work(
Consumption and use cost turn into important indicator, and the compromise factor of both schemes consideration all in need.
The content of the invention：
(1) technical problem solved
In order to solve the above problems, the invention provides a kind of LDO backlight drive circuits, its circuit structure is simple, selects
Drive IC conversion efficiencies higher, it is with low cost.
(2) technical scheme
A kind of LDO backlight drive circuits, including direct-current input power supplying, anti-reverse diode, the first electric capacity, the second electric capacity,
First resistor, second resistance, the first LED load, the second LED load and LDO chips；
The Vin pin of the LDO connect the anti-reverse diode negative terminal and described first electric capacity one end, the LDO respectively
Vout pin connect described second electric capacity one end, described first resistor one end and described second resistance one end respectively, the LDO's
GND pin are grounded；
The direct-current input power supplying anode series connection anti-reverse diode anode, the first resistor other end series connection institute
State the first LED load anode, the second resistance other end series connection the second LED load anode, the direct-current input power supplying
Negative terminal, the first electric capacity other end, the second electric capacity other end, the first LED load negative terminal and the 2nd LED are negative
End is loaded with all to be grounded.
Further, the direct-current input power supplying is 2.7~6V.
Further, the anti-reverse diode selects IN4148.
Further, the LDO selects AMC7135.
(3) beneficial effect
The invention provides a kind of LDO backlight drive circuits, its circuit structure is simple, and driving IC oneself power consumptions are relatively low, can
It is operated using single lithium battery, whole piece circuit cost is cheap, is suitably applied small volume and the LED flashlight of confined space
Cylinder.
Brief description of the drawings：
Fig. 1 is a kind of LDO backlight drive circuits schematic diagram involved in the present invention.
Embodiment：
Embodiment involved in the present invention is described in further details below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of LDO backlight drive circuits include direct-current input power supplying E, anti-reverse diode D1, the first electricity
Hold C1, the second electric capacity C2, first resistor R1, second resistance R2, the first LED load D2, the second LED load D3 and LDO chip U.
Direct-current input power supplying is 2.7~6V, and single-unit 1000mAh lithium batteries can be used, and anti-reverse diode D1 selects IN4148.LDO is selected
It is a 350mA ultra low differential pressures flow straightener with AMC7135, its efficiency high is up to 85%.AMC7135 Vin pin are power input
Pin, Vout pin are signal output pin, and GND pin are grounding leg.
AMC7135 Vin pin connect IN4148 negative terminals and electric capacity C1 one end respectively, and Vout pin connect electric capacity C2 mono- respectively
End, resistance R1 one end and resistance R2 one end, GND pin ground connection；Direct-current input power supplying E anodes series connection IN4148 anodes, resistance R1 is another
One end series connection LED load D2 anodes, the resistance R2 other ends series connection LED load D3 anodes, direct-current input power supplying E is born
End, the electric capacity C1 other ends, the electric capacity C2 other ends, LED load D2 negative terminals and LED load D3 negative terminals are all grounded.IN4148 prevents electricity
Pond reversal connection, electric capacity C1 and C2 are bypass filter capacitor, and resistance R1 and R2 are current-limiting resistance.
The invention provides a kind of LDO backlight drive circuits, its circuit structure is simple, and driving IC oneself power consumptions are relatively low, can
It is operated using single lithium battery, whole piece circuit cost is cheap, is suitably applied small volume and the LED flashlight of confined space
Cylinder.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to the structure of the present invention
Think and scope is defined.On the premise of design concept of the present invention is not departed from, technology of this area ordinary person to the present invention
The all variations and modifications that scheme is made, all should drop into protection scope of the present invention, claimed technology contents of the invention,
All record in detail in the claims.
Claims (4)
1. a kind of LDO backlight drive circuits, it is characterised in that：Including direct-current input power supplying, anti-reverse diode, the first electric capacity,
Second electric capacity, first resistor, second resistance, the first LED load, the second LED load and LDO chips；
The Vin pin of the LDO connect the anti-reverse diode negative terminal and described first electric capacity one end respectively, the LDO's
Vout pin connect described second electric capacity one end, described first resistor one end and described second resistance one end respectively, the LDO's
GND pin are grounded；
The direct-current input power supplying anode is connected the anti-reverse diode anode, the first resistor other end series connection described the
One LED load anode, the second resistance other end series connection the second LED load anode, the direct-current input power supplying negative terminal,
The first electric capacity other end, the second electric capacity other end, the first LED load negative terminal and second LED load are negative
End is all grounded.
2. a kind of LDO backlight drive circuits according to claim 1, it is characterised in that：The direct-current input power supplying is 2.7
~6V.
3. a kind of LDO backlight drive circuits according to claim 1, it is characterised in that：The anti-reverse diode is selected
IN4148。
4. a kind of LDO backlight drive circuits according to claim 1, it is characterised in that：The LDO selects AMC7135.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710527993.1A CN107087332A (en) | 2017-06-30 | 2017-06-30 | A kind of LDO backlight drive circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710527993.1A CN107087332A (en) | 2017-06-30 | 2017-06-30 | A kind of LDO backlight drive circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107087332A true CN107087332A (en) | 2017-08-22 |
Family
ID=59605980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710527993.1A Pending CN107087332A (en) | 2017-06-30 | 2017-06-30 | A kind of LDO backlight drive circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107087332A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205191282U (en) * | 2015-07-17 | 2016-04-27 | 林军 | Single high -power flashlight of LED |
| CN206977753U (en) * | 2017-06-30 | 2018-02-06 | 湖州升谱电子科技有限公司 | A kind of LDO backlight drive circuits |
-
2017
- 2017-06-30 CN CN201710527993.1A patent/CN107087332A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205191282U (en) * | 2015-07-17 | 2016-04-27 | 林军 | Single high -power flashlight of LED |
| CN206977753U (en) * | 2017-06-30 | 2018-02-06 | 湖州升谱电子科技有限公司 | A kind of LDO backlight drive circuits |
Non-Patent Citations (2)
| Title |
|---|
| ADDTEK CORP: "AMC7135", 《芯片手册》 * |
| 周志敏等: "《线性集成稳压电源实用电路》", 31 July 2006 * |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170822 |
|
| RJ01 | Rejection of invention patent application after publication |