CN205160369U - Power step -down control circuit - Google Patents
Power step -down control circuit Download PDFInfo
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- CN205160369U CN205160369U CN201520934922.XU CN201520934922U CN205160369U CN 205160369 U CN205160369 U CN 205160369U CN 201520934922 U CN201520934922 U CN 201520934922U CN 205160369 U CN205160369 U CN 205160369U
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Abstract
The utility model discloses a power step -down control circuit, its specific circuit component include the switching power supply chip, and be first to third resistance, first to the 6th electric capacity, diode and inductance. The utility model discloses a power step -down control circuit, simple structure, convenient to use can play dual function so that the step -down controller steps down in the negative output - steps up in the topology.
Description
Technical field
The utility model discloses a kind of power voltage step down control circuit, relate to electric and electronic technical field.
Background technology
Switching Power Supply utilizes modern power electronics technology, the time ratio that control switch pipe turns on and off, and maintain a kind of power supply of regulated output voltage, Switching Power Supply is generally made up of pulse width modulation (PWM) control IC and MOSFET.Along with development and the innovation of power electronic technology, switch power technology is also constantly being innovated.At present, Switching Power Supply to be widely used nearly all electronic equipment with small-sized, light weight and high efficiency feature, is the indispensable a kind of power mode of current electronics and information industry develop rapidly.
Under electronic circuit is all operated in positive voltage stabilizing output voltage usually, and these voltages are generally all provided by voltage-releasing voltage stabilizer.If also need negative output voltage simultaneously, so in buck-boost topology, just identical buck controller can be configured.Negative output voltage buck-boost is referred to as oppositely negative sometimes, and its operative duty cycles is 50%, can provide and be equivalent to input voltage but opposite polarity output voltage.It can regulate duty ratio along with the fluctuation of input voltage, maintains voltage stabilizing with a step-down or a boost output voltage.
Lack a kind of appropriate design in prior art, make buck controller play double action in negative output buck-boost topology.
Utility model content
Technical problem to be solved in the utility model is: for the defect of prior art, provides a kind of power voltage step down control circuit.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
A kind of power voltage step down control circuit, circuit element comprises switching power source chip, the first to the 3rd resistance, the first to the 6th electric capacity, diode and inductance, wherein,
The model of described switching power source chip is TPS5430, the positive pole of circuit respectively with one end of the second electric capacity, 7th pin of switching power source chip is connected and ground connection, the other end of the second electric capacity respectively with the second pin of switching power source chip, 3rd pin, 6th pin, 9th pin, one end of second resistance, one end of 3rd resistance, the positive pole of diode, one end of 3rd electric capacity, one end of 4th electric capacity is connected, the 4th pin of switching power source chip respectively with one end of the 5th electric capacity, the other end of the second resistance, one end of first resistance, one end of 6th electric capacity is connected, and the other end of the 5th electric capacity is connected with the other end of the 3rd resistance, and the first pin of switching power source chip is connected with one end of the first electric capacity, the other end of the first electric capacity respectively with the second pin of switching power source chip, one end of inductance, the negative pole of diode is connected, the other end of inductance respectively with the other end of the 3rd electric capacity, the other end of the 4th electric capacity, the other end of the 6th electric capacity, the other end of the first resistance, the negative pole of circuit is connected and ground connection.
As further preferred version of the present utility model, described 3rd electric capacity is polar capacitor.
As further preferred version of the present utility model, the model of described diode is MBRS340.
As further preferred version of the present utility model, described first, second, the 4th, the 5th, the 6th electric capacity is pottery or polymer capacitors.
As further preferred version of the present utility model, the size of described inductance is 4.7 μ H.
The utility model adopts above technical scheme compared with prior art, there is following technique effect: power voltage step down control circuit disclosed in the utility model, structure is simple, easy to use, and buck controller can be made in negative output buck-boost topology to play double action.
Accompanying drawing explanation
Fig. 1 is circuit components connection diagram of the present utility model,
Wherein: U1 is switching power source chip, R1 to R3 is the first to the 3rd resistance, and C1 to C6 is the first to the 6th electric capacity, and D1 is diode, and L1 is inductance.
Embodiment
Be described below in detail execution mode of the present utility model, the example of described execution mode is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the execution mode be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
Circuit components connection diagram of the present utility model as shown in Figure 1, a kind of power voltage step down control circuit, circuit element comprises switching power source chip, the first to the 3rd resistance, the first to the 6th electric capacity, diode and inductance, wherein,
The model of described switching power source chip is TPS5430, the positive pole of circuit respectively with one end of the second electric capacity, 7th pin of switching power source chip is connected and ground connection, the other end of the second electric capacity respectively with the second pin of switching power source chip, 3rd pin, 6th pin, 9th pin, one end of second resistance, one end of 3rd resistance, the positive pole of diode, one end of 3rd electric capacity, one end of 4th electric capacity is connected, the 4th pin of switching power source chip respectively with one end of the 5th electric capacity, the other end of the second resistance, one end of first resistance, one end of 6th electric capacity is connected, and the other end of the 5th electric capacity is connected with the other end of the 3rd resistance, and the first pin of switching power source chip is connected with one end of the first electric capacity, the other end of the first electric capacity respectively with the second pin of switching power source chip, one end of inductance, the negative pole of diode is connected, the other end of inductance respectively with the other end of the 3rd electric capacity, the other end of the 4th electric capacity, the other end of the 6th electric capacity, the other end of the first resistance, the negative pole of circuit is connected and ground connection.
As further preferred version of the present utility model, described 3rd electric capacity is polar capacitor.
As further preferred version of the present utility model, the model of described diode is MBRS340.
As further preferred version of the present utility model, described first, second, the 4th, the 5th, the 6th electric capacity is pottery or polymer capacitors.
As further preferred version of the present utility model, the size of described inductance is 4.7 μ H.
By reference to the accompanying drawings execution mode of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, can also make a variety of changes under the prerequisite not departing from the utility model aim.The above, it is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, although the utility model discloses as above with preferred embodiment, but and be not used to limit the utility model, any those skilled in the art, do not departing within the scope of technical solutions of the utility model, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solutions of the utility model content, according to technical spirit of the present utility model, within spirit of the present utility model and principle, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection range all still belonging to technical solutions of the utility model.
Claims (5)
1. a power voltage step down control circuit, is characterized in that: circuit element comprises switching power source chip, the first to the 3rd resistance, the first to the 6th electric capacity, diode and inductance, wherein,
The model of described switching power source chip is TPS5430, the positive pole of circuit respectively with one end of the second electric capacity, 7th pin of switching power source chip is connected and ground connection, the other end of the second electric capacity respectively with the second pin of switching power source chip, 3rd pin, 6th pin, 9th pin, one end of second resistance, one end of 3rd resistance, the positive pole of diode, one end of 3rd electric capacity, one end of 4th electric capacity is connected, the 4th pin of switching power source chip respectively with one end of the 5th electric capacity, the other end of the second resistance, one end of first resistance, one end of 6th electric capacity is connected, and the other end of the 5th electric capacity is connected with the other end of the 3rd resistance, and the first pin of switching power source chip is connected with one end of the first electric capacity, the other end of the first electric capacity respectively with the second pin of switching power source chip, one end of inductance, the negative pole of diode is connected, the other end of inductance respectively with the other end of the 3rd electric capacity, the other end of the 4th electric capacity, the other end of the 6th electric capacity, the other end of the first resistance, the negative pole of circuit is connected and ground connection.
2. a kind of power voltage step down control circuit as claimed in claim 1, is characterized in that: described 3rd electric capacity is polar capacitor.
3. a kind of power voltage step down control circuit as claimed in claim 1, is characterized in that: the model of described diode is MBRS340.
4. a kind of power voltage step down control circuit as claimed in claim 1, is characterized in that: described first, second, the 4th, the 5th, the 6th electric capacity is pottery or polymer capacitors.
5. a kind of power voltage step down control circuit as claimed in claim 1, is characterized in that: the size of described inductance is 4.7 μ H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520934922.XU CN205160369U (en) | 2015-11-20 | 2015-11-20 | Power step -down control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520934922.XU CN205160369U (en) | 2015-11-20 | 2015-11-20 | Power step -down control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205160369U true CN205160369U (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520934922.XU Active CN205160369U (en) | 2015-11-20 | 2015-11-20 | Power step -down control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108528051A (en) * | 2017-03-06 | 2018-09-14 | 珠海天威技术开发有限公司 | Source voltage control circuit and its working method, consumable chip and its working method |
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2015
- 2015-11-20 CN CN201520934922.XU patent/CN205160369U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108528051A (en) * | 2017-03-06 | 2018-09-14 | 珠海天威技术开发有限公司 | Source voltage control circuit and its working method, consumable chip and its working method |
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| C14 | Grant of patent or utility model | ||
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