CN202632724U - LCD backlight driving module in learning machine circuit - Google Patents
LCD backlight driving module in learning machine circuit Download PDFInfo
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- CN202632724U CN202632724U CN 201220201414 CN201220201414U CN202632724U CN 202632724 U CN202632724 U CN 202632724U CN 201220201414 CN201220201414 CN 201220201414 CN 201220201414 U CN201220201414 U CN 201220201414U CN 202632724 U CN202632724 U CN 202632724U
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- backlight driving
- driving chip
- learning machine
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Abstract
The utility model discloses an LCD (Liquid Crystal Display) backlight driving module in a learning machine circuit, comprising a backlight driving chip with a model of TT8539, wherein pins of the backlight driving chip are connected with a Zener diode, an inductor, and a plurality of resistors and capacitors, so that a working voltage of the backlight driving chip is stable. The LCD backlight driving module of the utility model can effectively raise frame stability of an LCD screen of a learning machine, so as to raise a display effect of the learning machine.
Description
Technical field
The utility model relates to the learning machine circuit field, is specially the LCD backlight drive module in a kind of learning machine circuit.
Background technology
Learning machine is a kind of electronic instruction series products, is widely used in the student group at home.Learning machine generally is made up of main control module and other peripheral circuit thereof, like LCD backlight drive module etc.Prior art learning machine lcd screen is prone in use because the problem of the small shake of picture, the normal demonstration of the machine that interferes with one's studies appear in spread of voltage.
The utility model content
The utility model purpose provides the LCD backlight drive module in a kind of learning machine circuit, to solve the problem that prior art learning machine lcd screen is prone to float.
In order to achieve the above object, the technical scheme that the utility model adopted is:
LCD backlight drive module in a kind of learning machine circuit; It is characterized in that: include the backlight driving chip U9 that model is TT8539; Be connected to inductance L 6 between the IN pin of backlight driving chip U9 and the SW pin; Also have two line conductors on the IN pin of backlight driving chip U9, a line conductor inserts voltage VB on the IN pin, and another line conductor is through capacitor C 61 ground connection on the IN pin; The SW pin of backlight driving chip U9 also is connected with the OVP pin of backlight driving chip U9 through voltage stabilizing diode D7; Also have two line conductors to draw between voltage stabilizing diode D7 and the OVP pin, a line conductor is through capacitor C 62 ground connection between voltage stabilizing diode D7 and the OVP pin, and another line conductor is drawn and inserted LCD screen positive pole between voltage stabilizing diode D7 and the OVP pin; Be connected to capacitor C 63 between the EN pin of backlight driving chip U9 and the GND pin; The EN pin of backlight driving chip U9 also inserts the main control chip of learning machine through resistance R 45, the GND pin is also through lead ground connection, and the FB pin of backlight driving chip U9 inserts LCD screen negative pole through resistance R 65; There is lead to draw between resistance R 65 and the LCD screen negative pole through resistance R 68 ground connection; Be divided into three the tunnel after having lead to draw between resistance R 65 and the FB pin to be connected to resistance R 71, a line conductor is through capacitor C 67 ground connection on the resistance R 71, and another line conductor inserts voltage VCCA through capacitor C 66 on the resistance R 71; The Third Road lead inserts the main control chip of learning machines through resistance R 70 on the resistance R 71, and has lead to draw through the last piezoelectric voltage VCCIO of resistance R 73 accesses between resistance R 70 and the learning machine main control chip.
The utility model is connected with the main control chip of learning machine, drives the lcd screen work of learning machine, on backlight driving chip, inserts voltage stabilizing diode, inductance, and through resistance and capacity earth, can guarantee the stable of backlight driving chip WV.The utility model can effectively improve learning machine lcd screen picture stability, and then has improved the display effect of learning machine.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
As shown in Figure 1.LCD backlight drive module in a kind of learning machine circuit; Include the backlight driving chip U9 that model is TT8539, be connected to inductance L 6 between the IN pin of backlight driving chip U9 and the SW pin, also have two line conductors on the IN pin of backlight driving chip U9; A line conductor inserts voltage VB on the IN pin; Another line conductor is through capacitor C 61 ground connection on the IN pin, and the SW pin of backlight driving chip U9 also is connected with the OVP pin of backlight driving chip U9 through voltage stabilizing diode D7, also has two line conductors to draw between voltage stabilizing diode D7 and the OVP pin; A line conductor is through capacitor C 62 ground connection between voltage stabilizing diode D7 and the OVP pin; Another line conductor is drawn and is inserted LCD screen positive pole between voltage stabilizing diode D7 and the OVP pin, is connected to capacitor C 63 between the EN pin of backlight driving chip U9 and the GND pin, and the EN pin of backlight driving chip U9 also inserts the main control chip of learning machines through resistance R 45; The GND pin is also through lead ground connection; The FB pin of backlight driving chip U9 inserts LCD screen negative poles through resistance R 65, and resistance R 65 is shielded between the negative pole with LCD has lead to draw through resistance R 68 ground connection, is divided into three the tunnel after having lead to draw between resistance R 65 and the FB pin to be connected to resistance R 71; A line conductor is through capacitor C 67 ground connection on the resistance R 71; Another line conductor inserts voltage VCCA through capacitor C 66 on the resistance R 71, and the Third Road lead inserts the main control chip of learning machines through resistance R 70 on the resistance R 71, and has lead to draw through resistance R 73 between resistance R 70 and the learning machine main control chip to insert upward piezoelectric voltage VCCIO.
Claims (1)
1. the LCD backlight drive module in the learning machine circuit; It is characterized in that: include the backlight driving chip U9 that model is TT8539; Be connected to inductance L 6 between the IN pin of backlight driving chip U9 and the SW pin; Also have two line conductors on the IN pin of backlight driving chip U9, a line conductor inserts voltage VB on the IN pin, and another line conductor is through capacitor C 61 ground connection on the IN pin; The SW pin of backlight driving chip U9 also is connected with the OVP pin of backlight driving chip U9 through voltage stabilizing diode D7; Also have two line conductors to draw between voltage stabilizing diode D7 and the OVP pin, a line conductor is through capacitor C 62 ground connection between voltage stabilizing diode D7 and the OVP pin, and another line conductor is drawn and inserted LCD screen positive pole between voltage stabilizing diode D7 and the OVP pin; Be connected to capacitor C 63 between the EN pin of backlight driving chip U9 and the GND pin; The EN pin of backlight driving chip U9 also inserts the main control chip of learning machine through resistance R 45, the GND pin is also through lead ground connection, and the FB pin of backlight driving chip U9 inserts LCD screen negative pole through resistance R 65; There is lead to draw between resistance R 65 and the LCD screen negative pole through resistance R 68 ground connection; Be divided into three the tunnel after having lead to draw between resistance R 65 and the FB pin to be connected to resistance R 71, a line conductor is through capacitor C 67 ground connection on the resistance R 71, and another line conductor inserts voltage VCCA through capacitor C 66 on the resistance R 71; The Third Road lead inserts the main control chip of learning machines through resistance R 70 on the resistance R 71, and has lead to draw through the last piezoelectric voltage VCCIO of resistance R 73 accesses between resistance R 70 and the learning machine main control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220201414 CN202632724U (en) | 2012-05-07 | 2012-05-07 | LCD backlight driving module in learning machine circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220201414 CN202632724U (en) | 2012-05-07 | 2012-05-07 | LCD backlight driving module in learning machine circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202632724U true CN202632724U (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220201414 Expired - Fee Related CN202632724U (en) | 2012-05-07 | 2012-05-07 | LCD backlight driving module in learning machine circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202632724U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128389A (en) * | 2016-08-29 | 2016-11-16 | 合肥惠科金扬科技有限公司 | A kind of TFT LCD liquid crystal display screen display delayed control circuit |
| CN106340276A (en) * | 2016-08-29 | 2017-01-18 | 合肥惠科金扬科技有限公司 | Circuit voltage stabilizer of liquid crystal display screen |
-
2012
- 2012-05-07 CN CN 201220201414 patent/CN202632724U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128389A (en) * | 2016-08-29 | 2016-11-16 | 合肥惠科金扬科技有限公司 | A kind of TFT LCD liquid crystal display screen display delayed control circuit |
| CN106340276A (en) * | 2016-08-29 | 2017-01-18 | 合肥惠科金扬科技有限公司 | Circuit voltage stabilizer of liquid crystal display screen |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20130507 |