CN201937471U - Novel high-low voltage conversion circuit - Google Patents
Novel high-low voltage conversion circuit Download PDFInfo
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- CN201937471U CN201937471U CN2011200412963U CN201120041296U CN201937471U CN 201937471 U CN201937471 U CN 201937471U CN 2011200412963 U CN2011200412963 U CN 2011200412963U CN 201120041296 U CN201120041296 U CN 201120041296U CN 201937471 U CN201937471 U CN 201937471U
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Abstract
The utility model discloses a novel high-low voltage conversion circuit. An SY8142 of American Silergy Company is adopted as a DC (direct current)-DC converter, a peripheral circuit of the SY8142 inputs a 12V DC power supply through a pin 7, and an inductor L1 connected in series with a pin 6 is used as output; resistors R1 and R4 are connected in series to form an output end sampling circuit which is connected with a sampling input end pin 1; a pin 5 is connected to an output end through a capacitor; and a pin 8 is connected to the 12V DC power supply through a resistor. In the high-low voltage conversion circuit, the SY8142 DC-DC converter of American Silergy Company is integrated with one 2A schottky diode and an MOS (Metal Oxide Semiconductor) tube, thereby realizing 12V DC input and 3.3V DC output through the simple peripheral circuit; and the circuit can save the direct cost by 25 percent compared with other IC (integrated circuit) with the same functions, the size of a PCB (Printed circuit board) can be integrated by 50 percent, and the novel high-low voltage conversion circuit is especially applicable to taking an EPON (Ethernet Passive Optical Network) product as a low-cost compact DC power supply.
Description
Technical field
The utility model relates to a kind of level shifter circuit that is used for the direct voltage conversion.
Background technology
The DC/DC transducer is widely used in the various electronic products such as mobile phone, MODEM, router, switch, EPON, GPON at present as changing behind the input voltage the effectively electric pressure converter of output fixed voltage.Along with the continuous development of market and technology, these electronic product renewal speed are more and more faster, and more and more miniaturization for making things convenient for popularizing and promoting of market, requires its volume constantly to dwindle thereupon, and corresponding cost constantly reduces.
The utility model content
The purpose of this utility model is to provide a kind of novel level shifter circuit, and not only circuit is simple, is easy to realize that it is little to have the PCB of taking size simultaneously, the characteristics that price is lower.
For achieving the above object, the utility model is achieved through the following technical solutions:
A kind of novel level shifter circuit, adopt the SY8142 of U.S. Silergy Corporation as the DC-DC transducer, its peripheral circuit is by 7 pin input 12VDC power supply, by the L1 inductance of connecting with 6 pin as output, resistance R 1 and R4 are composed in series the output sample circuit, and be connected with sampling input 1 pin, 5 pin are connected to output by electric capacity, and 8 pin are connected to the 12VDC power supply by resistance.
The size of the size decision output voltage of R1 and R4 resistance, its pass is an output voltage V
Out=0.6 * (1+R1/R4), it is 10K-200K Ω that R4 recommends resistance value.
Described output is parallel with output filter capacitor, more than the preferred 22 μ F.
Level shifter circuit described in the utility model, the SY8142DC-DC of the U.S. Silergy Corporation transducer that is adopted is integrated 1 2A Schottky diode and metal-oxide-semiconductor, can realize 12VDC input 3.3VDC output by simple peripheral circuit, other IC direct costs that this circuit is more identical than function can save 25%, the PCB size can be integrated 50%, especially can be applicable to the EPON product as low-cost compact DC power supply.
Description of drawings
According to embodiment and accompanying drawing the utility model is described in further detail below.
Fig. 1 is that the described 12VDC of the utility model embodiment is converted to the 3.3VDC circuit theory diagrams;
Fig. 2 is the SY8142DC-DC of a described U.S. Silergy Corporation converter function block diagram.
Embodiment
As shown in Figure 1, the circuit theory diagrams of a specific embodiment of novel level shifter circuit described in the utility model have been provided.
This circuit is used for the EPON product, and input voltage is 12VDC, by this circuit 12VDC is converted to 3.3VDC.This circuit structure is simple, can form 2A by simple peripheral circuit, the 3.3V DC power supply.The U.S. Silergy Corporation SY8142 DC-DC transducer that is adopted is integrated 1 2A Schottky diode and metal-oxide-semiconductor; its internal structure functional block diagram as shown in Figure 2; by comparator; the PWM controller; protector (overcurrent, overvoltage, temperature protection circuit are formed); compositions such as output driven MOS pipe, its each pinout is as shown in the table.
| Pin | Definition | Describe |
| BS | 5 | Output enable is connected with LX by 0.1uF electric capacity |
| IN | 7 | Input pin |
| LX | 6 | Output pin connects |
| GND | ||
| 4 | | |
| FB | ||
| 1 | Output sampling pin, this pin is connected to the output voltage pin by resistance | |
| EN | 8 | PWM control enables, and height has. |
| NC | 2,3 | Empty pin |
The 12VDC power supply is imported by 7 pin, the L1 inductance output 3.3V power supply of 6 pin, resistance R 1 and R4 are composed in series the output sample circuit, and 1 pin is connected to 3.3V as the sampling input, 5 pin are connected to 12VDC by 0.1 μ F electric capacity, 8 pin by on draw 10k Ω resistance to be connected to 12VDC.
The size of R1 and R4 resistance has determined, the size of output voltage, and its relation is as follows:
V
Out=0.6 * (1+R1/R4), it is 10K-200k Ω that R4 recommends resistance value,
Above-mentioned 3.3V circuit calculates, R1=100K Ω, R4=22.1K Ω.
Output filter capacitor C4 selects, and more than the 22 μ F, this enforcement is executed example and selected 470 μ F;
The L1 inductance value is selected as follows:
This power supply product test is summed up:
Input 12VDC, output 3.3V, when loading on 0.2-2.0A, efficient reaches 85%;
Output 3.3V, output ripple is less than 50mV during 1.5A
Switching frequency is stablized 800khz;
Chip operation is stablized 52 degree, and operational environment is 25 degree.
Other IC direct costs that this circuit is more identical than function can save 25%, and the PCB size can integrated 50%.
Claims (3)
1. novel level shifter circuit, it is characterized in that, adopt the SY8142 of U.S. Silergy Corporation as the DC-DC transducer, its peripheral circuit is by 7 pin input 12VDC power supply, as output, resistance R 1 and R4 are composed in series the output sample circuit by the L1 inductance of connecting with 6 pin, and are connected with sampling input 1 pin, 5 pin are connected to output by electric capacity, and 8 pin are connected to the 12VDC power supply by resistance.
2. a kind of novel level shifter circuit according to claim 1 is characterized in that: the size of the size decision output voltage of R1 and R4 resistance, its pass is an output voltage V
Out=0.6 * (1+R1/R4), it is 10K-200K Ω that R4 recommends resistance value.
3. a kind of novel level shifter circuit according to claim 1, it is characterized in that: described output is parallel with output filter capacitor, more than the preferred 22 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200412963U CN201937471U (en) | 2011-02-18 | 2011-02-18 | Novel high-low voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200412963U CN201937471U (en) | 2011-02-18 | 2011-02-18 | Novel high-low voltage conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201937471U true CN201937471U (en) | 2011-08-17 |
Family
ID=44448976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200412963U Expired - Lifetime CN201937471U (en) | 2011-02-18 | 2011-02-18 | Novel high-low voltage conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201937471U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995007A (en) * | 2019-11-29 | 2020-04-10 | 北京航天长征飞行器研究所 | Isolated high-low voltage conversion self-holding circuit |
-
2011
- 2011-02-18 CN CN2011200412963U patent/CN201937471U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995007A (en) * | 2019-11-29 | 2020-04-10 | 北京航天长征飞行器研究所 | Isolated high-low voltage conversion self-holding circuit |
| CN110995007B (en) * | 2019-11-29 | 2021-11-16 | 北京航天长征飞行器研究所 | Isolated high-low voltage conversion self-holding circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN DONGZHI TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHENZHEN DONGZHI EQUIPMENT CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518055 Nanshan District, Shenzhen, Zhongshan Road, dawn Industrial Zone, building three, building five, building Patentee after: Shenzhen Dong Zhi Science and Technology Ltd. Address before: 518055 Nanshan District, Shenzhen, Zhongshan Road, dawn Industrial Zone, building three, building five, building Patentee before: Shenzhen Torch Equipment Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518055 Nanshan District, Shenzhen, Zhongshan Road, dawn Industrial Zone, building three, building five, building Patentee after: Shenzhen Technology Co., Ltd. Address before: 518055 Nanshan District, Shenzhen, Zhongshan Road, dawn Industrial Zone, building three, building five, building Patentee before: Shenzhen Dong Zhi Science and Technology Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110817 |