CN206977756U - A kind of DC DC step-down LED constant-current drive circuits - Google Patents
A kind of DC DC step-down LED constant-current drive circuits Download PDFInfo
- Publication number
- CN206977756U CN206977756U CN201720843487.9U CN201720843487U CN206977756U CN 206977756 U CN206977756 U CN 206977756U CN 201720843487 U CN201720843487 U CN 201720843487U CN 206977756 U CN206977756 U CN 206977756U
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- pin
- electric capacity
- current drive
- drive circuit
- decompression
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Abstract
The utility model provides a kind of DC DC step-down LED constant-current drive circuits, including direct-current input power supplying, the first~the 4th electric capacity, first~3rd resistor, the first~the 3rd LED load and DC DC decompression chips.The utility model only needs external four conventional ceramic electric capacity, without afterflow inductance, you can realizes the decompression constant current driving of LED load, its circuit structure is simple, and cost is cheap, can be applied to white LED backlight driving.
Description
Technical field：
A kind of electronic circuit is the utility model is related to, more particularly to a kind of DC-DC step-down LEDs constant-current drive circuit.
Background technology：
At present, LED DC-DC step-down constant currents drive circuit is mostly using super capacitor and the topology knot of afterflow inductance
Structure, its response speed is slower, and dynamic range is narrower, and conversion efficiency is relatively low.
Utility model content：
(1) technical problem solved
In order to solve the above problems, the utility model proposes a kind of DC-DC step-down LEDs constant-current drive circuit, only needs
External four conventional ceramic electric capacity.
(2) technical scheme
A kind of DC-DC step-down LEDs constant-current drive circuit, including direct-current input power supplying, the first~the 4th electric capacity, first~
3rd resistor, the first~the 3rd LED load and DC-DC decompression chips；
DC-DC decompression chip I N pin respectively with the direct-current input power supplying anode and described 3rd electric capacity one end phase
Even, DC-DC decompression chip C1+ pin and C1- pin be by first capacitance connection, the DC-DC decompression chip C2+ pin and
C2- pin by second capacitance connection, the DC-DC decompression chip OUT pin respectively with described 4th electric capacity one end and described
First~the 3rd LED load anode is connected, DC-DC decompression chip GND pin respectively with the direct-current input power supplying negative terminal and
The 3rd electric capacity other end is connected and then is grounded；
Described first~the 3rd LED load negative terminal is connected with described first~3rd resistor one end respectively, the 4th electricity
Hold the other end respectively with first~3rd resistor other end to be connected and then be grounded.
Further, the direct-current input power supplying is 2.7~5.3V.
Further, the described first~the 4th electric capacity is conventional ceramic electric capacity, and capacitance is identical.
Further, first~3rd resistor resistance is identical.
Further, the DC-DC decompressions chip selects SC600.
(3) beneficial effect
The utility model provides a kind of DC-DC step-down LEDs constant-current drive circuit, only needs external four conventional ceramic electricity
Hold, without afterflow inductance, you can realize the decompression constant current driving of LED load, its circuit structure is simple, and cost is cheap, can apply
Driven in white LED backlight.
Brief description of the drawings：
Described in Fig. 1 a kind of new involved DC-DC step-down LEDs constant-current drive circuit schematic diagram is used for this.
Embodiment：
The embodiment involved by the utility model is described in further details below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of DC-DC step-down LEDs constant-current drive circuit, including direct-current input power supplying E, the first~the 4th
Electric capacity C1~C4, first~3rd resistor R1~R3, the first~the 3rd LED load D1~D3 and DC-DC decompression chips U.Wherein
Direct-current input power supplying E is 2.7~5.3V, and conventional ceramic electric capacity C1~C4 capacitances are identical, and resistance R1~R3 resistances are identical, DC-DC
Decompression chip U select SC600, for a wide dynamic range high efficiency dc-to-dc step-down constant current driving chip, its C1+ pin,
C1- pin, C2+ pin and C2- pin are external capacitor pin, and IN pin are chip power pin, and OUT pin are signal output pin, and GND pin are ground connection
Pin.
SC600 IN pin are connected with direct-current input power supplying E anodes and electric capacity C3 one end respectively, SC600 C1+ pin and C1-
Pin is connected by electric capacity C1, and SC600 C2+ pin are connected with C2- pin by electric capacity C2, SC600 OUT pin respectively with electric capacity C4 mono-
End is connected with LED load D1~D3 anodes, SC600 GND pin respectively with direct-current input power supplying E negative terminals and electric capacity C3 other end phases
Even and then it is grounded；LED load D1~D3 negative terminals are connected with resistance R1~R3 one end respectively, the electric capacity C4 other ends respectively with resistance R1
~R3 the other ends are connected and then are grounded.Electric capacity C1~C4 is filter capacitor, and resistance R1~R3 is divider resistance.
The utility model provides a kind of DC-DC step-down LEDs constant-current drive circuit, only needs external four conventional ceramic electricity
Hold, without afterflow inductance, you can realize the decompression constant current driving of LED load, its circuit structure is simple, and cost is cheap, can apply
Driven in white LED backlight.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality
New spirit and scope are defined.On the premise of the utility model design conception is not departed from, ordinary people in the field couple
The all variations and modifications that the technical solution of the utility model is made, the scope of protection of the utility model, this reality all should be dropped into
With new claimed technology contents, all record in detail in the claims.
Claims (5)
- A kind of 1. DC-DC step-down LEDs constant-current drive circuit, it is characterised in that：Including direct-current input power supplying, the first~the 4th electricity Appearance, first~3rd resistor, the first~the 3rd LED load and DC-DC decompression chips；The DC-DC decompressions chip I N pin are connected with the direct-current input power supplying anode and described 3rd electric capacity one end respectively, institute State DC-DC decompression chip C1+ pin and C1- pin and pass through first capacitance connection, the DC-DC decompression chip C2+ pin and C2- pin By second capacitance connection, DC-DC decompression chip OUT pin respectively with described 4th electric capacity one end and described first~ 3rd LED load anode is connected, DC-DC decompression chip GND pin respectively with the direct-current input power supplying negative terminal and described the The three electric capacity other ends are connected and then are grounded；Described first~the 3rd LED load negative terminal is connected with described first~3rd resistor one end respectively, and the 4th electric capacity is another One end is connected and then is grounded with first~3rd resistor other end respectively.
- A kind of 2. DC-DC step-down LEDs constant-current drive circuit according to claim 1, it is characterised in that：The direct current is defeated It is 2.7~5.3V to enter power supply.
- A kind of 3. DC-DC step-down LEDs constant-current drive circuit according to claim 1, it is characterised in that：Described first~ 4th electric capacity is conventional ceramic electric capacity, and capacitance is identical.
- A kind of 4. DC-DC step-down LEDs constant-current drive circuit according to claim 1, it is characterised in that：Described first~ 3rd resistor resistance is identical.
- A kind of 5. DC-DC step-down LEDs constant-current drive circuit according to claim 1, it is characterised in that：The DC-DC Decompression chip selects SC600.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720843487.9U CN206977756U (en) | 2017-07-12 | 2017-07-12 | A kind of DC DC step-down LED constant-current drive circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720843487.9U CN206977756U (en) | 2017-07-12 | 2017-07-12 | A kind of DC DC step-down LED constant-current drive circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206977756U true CN206977756U (en) | 2018-02-06 |
Family
ID=61403010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720843487.9U Expired - Fee Related CN206977756U (en) | 2017-07-12 | 2017-07-12 | A kind of DC DC step-down LED constant-current drive circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206977756U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107249233A (en) * | 2017-07-12 | 2017-10-13 | 湖州升谱电子科技有限公司 | A kind of DC DC step-down LED constant-current drive circuits |
-
2017
- 2017-07-12 CN CN201720843487.9U patent/CN206977756U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107249233A (en) * | 2017-07-12 | 2017-10-13 | 湖州升谱电子科技有限公司 | A kind of DC DC step-down LED constant-current drive circuits |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180206 Termination date: 20180712 |
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| CF01 | Termination of patent right due to non-payment of annual fee |