CN204256574U - Regulating circuit, circuit board and printer - Google Patents
Regulating circuit, circuit board and printer Download PDFInfo
- Publication number
- CN204256574U CN204256574U CN201420801809.XU CN201420801809U CN204256574U CN 204256574 U CN204256574 U CN 204256574U CN 201420801809 U CN201420801809 U CN 201420801809U CN 204256574 U CN204256574 U CN 204256574U
- Authority
- CN
- China
- Prior art keywords
- chip
- pin
- regulating circuit
- circuit
- output
- 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.)
- Expired - Fee Related
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model provides a kind of regulating circuit, circuit board and printer, this regulating circuit comprises the chip of LM2596 level pressure output type, input capacitance, inductance, output capacitance, diode and resistance, the input end of regulating circuit is connected with the input pin of chip, the positive pole of input capacitance is connected with the input pin of chip, the negative pole of input capacitance is connected with the grounding pin of chip, the grounding pin of chip is electrically connected with the strobe pin of chip, the positive pole of diode is connected with the grounding pin of chip, the negative pole of diode is connected with the output pin of chip, inductance is series between the output pin of chip and the output terminal of regulating circuit, the positive pole of output capacitance is connected with the output terminal of regulating circuit, the negative pole of output capacitance is connected with the grounding pin of chip, resistant series is between the feedback pin and the output terminal of regulating circuit of chip.The utility model decreases the peripheral component of chip, reduces cost, improves anti-interference and the reliability of circuit.
Description
Technical field
The utility model relates to regulating circuit, particularly a kind of LM2596 of use level pressure output type chip regulating circuit, be provided with the circuit board of this regulating circuit and comprise the printer of this circuit board.
Background technology
LM2596 series is the step-down switching type integrated voltage-stabilized chip of the 3A electric current output that National Semiconductor produces, there is the features such as simple, efficient, stable and high-power, be the preferred chip in power management R&D process, be widely used in various instrument and electronic equipment at present.The integrated frequency compensation of chip internal of LM2596 series and fixed frequency generator; switching frequency is 150KHz; there are perfect protection circuit, current limit circuit and Thermal shutdown circuit etc., utilize this device only to need few peripheral components just can form efficient mu balanced circuit.The chip of LM2596 series not only can be fixed and export 3.3V, 5V, 12V, can also the adjustable various voltages exported between 1.2V to 37V.
In the power management R&D process of reality; when using LM2596 level pressure output type chip; meet magnitude of voltage to make supply voltage to stablize and requirement such as ripple little grade, people often add reverse protection circuit, short-circuit protection circuit, current detection circuit, complicated filtering circuit and discrete power-supplying circuit etc. in the current supply circuit of application.The adding of these functional circuits add line pressure more or less to fall, the actual voltage value of application end is caused to decline, thus do not reach nominal voltage value, particularly in the application scenario of 3.3V and 5V working standard voltage, such as MCU (micro-control unit) chip, ADC (A-D converter) application, do the application etc. of benchmark and thresholding with supply voltage.
For the problems referred to above, can choice for use LM2596 adjustable voltage cake core, but need additionally to increase some components and parts such as resistance R1, resistance R2 and electric capacity C
fF, composition feedback network with it with the use of, as shown in Figure 1.After the feedback pin of chip increases peripheral component, can unfavorable factor be introduced, cause anti-interference and the reliability decrease of integrated circuit, and add cost and volume.
Utility model content
The technical problems to be solved in the utility model increases components and parts composition feedback network cause the anti-interference of circuit and reliability decrease, high, the bulky defect of cost to overcome in prior art LM2596 adjustable voltage cake core periphery, provides a kind of convenient and practical, regulating circuit that reliability is high.
The utility model solves above-mentioned technical matters by following technical proposals:
A kind of regulating circuit, its feature is, this regulating circuit comprises the chip of a LM2596 level pressure output type, one input capacitance, one inductance, one output capacitance, one diode and a resistance, the input end of this regulating circuit is connected with the input pin of this chip, the positive pole of this input capacitance is connected with the input pin of this chip, the negative pole of this input capacitance is connected with the grounding pin of this chip, the grounding pin of this chip is electrically connected with the strobe pin of this chip, the positive pole of this diode is connected with the grounding pin of this chip, the negative pole of this diode is connected with the output pin of this chip, this inductance is series between the output pin of this chip and the output terminal of this regulating circuit, the positive pole of this output capacitance is connected with the output terminal of this regulating circuit, the negative pole of this output capacitance is connected with the grounding pin of this chip, this resistant series is between the feedback pin and the output terminal of this regulating circuit of this chip.
In this programme, built-in sampling ratio circuit in the chip of LM2596 level pressure output type, by a resistance of connecting with the output terminal of regulating circuit in the feedback pin of this chip, the sampling ratio in existing sampling ratio circuit is changed, thus reach the object controlling output voltage.Regulating circuit of the present utility model also can be designed as a module, convenient transplanting.
Preferably, this regulating circuit also comprises a filtering circuit, this filtering circuit and this resistor coupled in parallel.In this programme, filtering circuit carries out filtering to the output voltage of regulating circuit.
Preferably, this chip is LM2596-3.3, LM2596-5.0 or LM2596-12 that National Semiconductor produces.LM2596-3.3 chip can be fixed and export 3.3V, LM2596-5.0 chip and can fix and export 5.0V, LM2596-12 chip and can fix and export 12V.
Preferably, this input capacitance and this output capacitance are electrochemical capacitor.
Preferably, this diode is schottky diode.
The invention also discloses a kind of circuit board, its feature is, this circuit board is provided with regulating circuit as above.
The invention also discloses a kind of printer, its feature is, this printer comprises circuit board as above.
Positive progressive effect of the present utility model is: compared with prior art, the utility model realizes controlling output voltage by the resistance of connecting with the output terminal of regulating circuit of the feedback pin at LM2596 level pressure output type chip, decrease peripheral component, reduce cost, make circuit board wiring simple, improve anti-interference and the reliability of circuit.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of regulating circuit in prior art.
Fig. 2 is the circuit diagram of the regulating circuit of the utility model embodiment.
Embodiment
Lift preferred embodiment below, and come by reference to the accompanying drawings clearlyer intactly the utility model to be described.
The circuit diagram of the present embodiment regulating circuit as shown in Figure 2, comprises the chip of LM2596 level pressure output type, input capacitance C
iN, inductance L, output capacitance C
oUT, diode D1 and resistance R, the pin 1 of this chip is input pin, and the pin 2 of this chip is output pin, and the pin 3 of this chip is grounding pin, and the pin 4 of this chip is feedback pin, and the pin 5 of this chip is strobe pin.The input end V of this regulating circuit
iNwith input capacitance C
iNpositive pole be all connected with pin 1, input capacitance C
iNnegative pole be connected with pin 3, pin 3 is connected with pin 5, and the positive pole of diode D1 is connected with pin 3, and the negative pole of diode D1 is connected with pin 2, and inductance L is series at the output terminal V of pin 2 and this regulating circuit
oUTbetween, the positive pole of this output capacitance is connected with the output terminal of this regulating circuit, output capacitance C
oUTnegative pole be connected with pin 3, resistance R is series at the output terminal V of pin 4 and this regulating circuit
oUTbetween.
When the LM2596 level pressure output type chip selected is LM2596-3.3, the output voltage values of the regulating circuit of the present embodiment is greater than 3.3V and is less than 37V; When the LM2596 level pressure output type chip selected is LM2596-5.0, the output voltage values of the regulating circuit of the present embodiment is greater than 5.0V and is less than 37V; When the LM2596 level pressure output type chip selected is LM2596-12, the output voltage values of the regulating circuit of the present embodiment is greater than 12V and is less than 37V.
In the regulating circuit of the present embodiment, can calculate the value of the resistance of feedback pin and the regulating circuit output terminal being series at this chip according to the output voltage values wanting to obtain and selected LM2596 level pressure output type chip, the precision of the output voltage values of this regulating circuit depends on the precision of this resistance.If the chip of choice for use is LM2596-3.3, the output voltage values obtained is wanted to be 5V, the resistance value that can calculate the feedback pin being series at LM2596-3.3 chip and regulating circuit output terminal is accordingly 5/0.494-6.7=3.42K Ω, wherein 0.494 is the sampling ratio value of LM2596-3.3 chip internal, and 6.7 is the parameter value of LM2596-3.3 chip internal.
The present embodiment additionally provides a kind of circuit board, and this circuit board is provided with the regulating circuit in the present embodiment as above.
The present embodiment additionally provides a kind of printer, and this printer comprises the circuit board in the present embodiment as above.The printer of the present embodiment comprises regulating circuit as above, and this regulating circuit is that printer provides stable voltage, and reliability is high, and the area taken in the circuit board is little, reduces cost.
Although the foregoing describe embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present utility model and essence, can make various changes or modifications to these embodiments, but these change and amendment all falls into protection domain of the present utility model.
Claims (7)
1. a regulating circuit, it is characterized in that, this regulating circuit comprises the chip of a LM2596 level pressure output type, one input capacitance, one inductance, one output capacitance, one diode and a resistance, the input end of this regulating circuit is connected with the input pin of this chip, the positive pole of this input capacitance is connected with the input pin of this chip, the negative pole of this input capacitance is connected with the grounding pin of this chip, the grounding pin of this chip is electrically connected with the strobe pin of this chip, the positive pole of this diode is connected with the grounding pin of this chip, the negative pole of this diode is connected with the output pin of this chip, this inductance is series between the output pin of this chip and the output terminal of this regulating circuit, the positive pole of this output capacitance is connected with the output terminal of this regulating circuit, the negative pole of this output capacitance is connected with the grounding pin of this chip, this resistant series is between the feedback pin and the output terminal of this regulating circuit of this chip.
2. regulating circuit as claimed in claim 1, it is characterized in that, this regulating circuit also comprises a filtering circuit, this filtering circuit and this resistor coupled in parallel.
3. regulating circuit as claimed in claim 1, is characterized in that, this chip is LM2596-3.3, LM2596-5.0 or LM2596-12 that National Semiconductor produces.
4. regulating circuit as claimed in claim 1, is characterized in that, this input capacitance and this output capacitance are electrochemical capacitor.
5. regulating circuit as claimed in claim 1, it is characterized in that, this diode is schottky diode.
6. a circuit board, is characterized in that, this circuit board is provided with as the regulating circuit in Claims 1 to 5 as described in any one.
7. a printer, is characterized in that, this printer comprises circuit board as claimed in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420801809.XU CN204256574U (en) | 2014-12-16 | 2014-12-16 | Regulating circuit, circuit board and printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420801809.XU CN204256574U (en) | 2014-12-16 | 2014-12-16 | Regulating circuit, circuit board and printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204256574U true CN204256574U (en) | 2015-04-08 |
Family
ID=52960860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420801809.XU Expired - Fee Related CN204256574U (en) | 2014-12-16 | 2014-12-16 | Regulating circuit, circuit board and printer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204256574U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596646A (en) * | 2016-12-26 | 2017-04-26 | 重庆市合川区九峰煤炭有限公司 | Mine gas detection system designed based on adjustable voltage stabilizing integrated circuit |
-
2014
- 2014-12-16 CN CN201420801809.XU patent/CN204256574U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596646A (en) * | 2016-12-26 | 2017-04-26 | 重庆市合川区九峰煤炭有限公司 | Mine gas detection system designed based on adjustable voltage stabilizing integrated circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207241434U (en) | Display instrument and automobile for automobile | |
| CN202906767U (en) | Switching power supply with continuously adjustable output voltage | |
| CN110504826B (en) | LED driving system, ripple removing circuit and method | |
| CN103647447B (en) | The supply unit of a kind of electric energy table communication module | |
| CN204256574U (en) | Regulating circuit, circuit board and printer | |
| CN203405750U (en) | Voltage stabilizing circuit and voltage stabilizing power supply device | |
| CN202602552U (en) | Conversion circuit capable of converting AC 220V into DC 5V directly | |
| CN205453496U (en) | Chip mounter equipment's power supply circuit | |
| CN207766145U (en) | A kind of MCU power supply circuits and electronic equipment | |
| CN204517690U (en) | Regulator rectifier circuit | |
| CN203204486U (en) | Current reducing protection type power stabilizer for communication equipment | |
| CN202978700U (en) | Voltage conversion circuit | |
| CN103036408A (en) | Power supply filter circuit | |
| CN202374179U (en) | Voltage-stabilizing circuit | |
| CN205490201U (en) | Voltage current transmitter's auxiliary power circuit | |
| CN101364771B (en) | Single chip controlled power supply apparatus | |
| CN203422693U (en) | Direct-current voltage stabilizing circuit | |
| CN202276285U (en) | Power supply filter circuit used for stored program control exchange | |
| CN206250963U (en) | A kind of highly reliable power supply circuit | |
| CN205193651U (en) | Instantaneous large current output circuit among low -power circuit | |
| CN101753047A (en) | Stabilized voltage output feedback isolation circuit | |
| CN204349821U (en) | The integrated power supply of high reliability | |
| CN201075826Y (en) | Power adapter controlled by single chip | |
| CN202135070U (en) | Dual-voltage capacitance-resistance voltage-reduction energy saving circuit | |
| CN203191920U (en) | Main board power supply |
Legal Events
| 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: 20150408 Termination date: 20211216 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |