CN205092240U - Temperature protection circuit - Google Patents
Temperature protection circuit Download PDFInfo
- Publication number
- CN205092240U CN205092240U CN201520844227.4U CN201520844227U CN205092240U CN 205092240 U CN205092240 U CN 205092240U CN 201520844227 U CN201520844227 U CN 201520844227U CN 205092240 U CN205092240 U CN 205092240U
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- CN
- China
- Prior art keywords
- resistance
- npn
- npn pipe
- pipe
- nmos tube
- 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
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- Semiconductor Integrated Circuits (AREA)
Abstract
The utility model discloses a TEMPERATURE PROTECTION CIRCUIT, including first resistance, second resistance, a NMOS pipe, third resistance and a NPN pipe, a termination power voltage VCC of first resistance, the one end of another termination second resistance and the drain electrode of NMOS pipe and the base that a NPN managed, the base of the one end of the first resistance of a termination of second resistance and the drain electrode of NMOS pipe and NPN pipe, other end ground connection, the grid of NMOS pipe connects the one end of third resistance and the collecting electrode of NPN pipe, and the drain electrode connects one end and the one end of second resistance and the base of NPN pipe of first resistance, source electrode ground connection. The utility model discloses first resistance and the 2nd resistive voltage divider obtain the base voltage that a voltage was managed as a NPN, and when the temperature rose, a NPN piping expert made output VOUT become the low level, normal during operation, NPN pipe does not switch on, and output VOUT is the high level.
Description
Technical field
The utility model relates to integrated circuit technique, refers more particularly to temperature protection circuit.
Background technology
In integrated circuits, can produce error message when temperature is too high, in order to avoid such phenomenon occurs, meeting set temperature protective circuit, is used for turning off corresponding output.
Summary of the invention
The utility model aims to provide a kind of output signal can along with the temperature protection circuit of variations in temperature.
Temperature protection circuit, comprises the first resistance, the second resistance, the first NMOS tube, the 3rd resistance and a NPN and manages:
One termination supply voltage VCC of described first resistance, the base stage of one end of the second resistance described in another termination and the drain electrode of described first NMOS tube and a described NPN pipe;
The base stage of one end of the first resistance described in one termination of described second resistance and the drain electrode of described first NMOS tube and a described NPN pipe, other end ground connection;
The grid of described first NMOS tube connects one end of described 3rd resistance and the collector electrode of a described NPN pipe, and drain electrode connects the base stage of one end of described first resistance and one end of described second resistance and a described NPN pipe, source ground;
One termination supply voltage VCC of described 3rd resistance, the collector electrode of a NPN pipe described in another termination and the grid of described first NMOS tube;
The base stage of a described NPN pipe connects the drain electrode of one end of described first resistance and one end of described second resistance and described first NMOS tube, and collector electrode connects one end of described 3rd resistance and the grid of described first NMOS tube, grounded emitter.
Described first resistance and described second electric resistance partial pressure obtain the base voltage of a voltage as a described NPN pipe, when temperature height, because the BE junction voltage of a described NPN pipe 50 is negative temperature coefficients, when temperature reaches uniform temperature, a described NPN pipe conducting makes output VOUT become low level; During normal work, because a described NPN manages not conducting, such output VOUT is high level.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of temperature protection circuit of the present utility model.
Fig. 2 is temperature protection voltage variation with temperature figure of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model content is further illustrated.
Temperature protection circuit, as shown in Figure 1, comprises the first resistance 10, second resistance 20, first NMOS tube 30, the 3rd resistance 40 and a NPN pipe 50:
One termination supply voltage VCC of described first resistance 10, the base stage of one end of the second resistance 20 described in another termination and the drain electrode of described first NMOS tube 30 and a described NPN pipe 50;
The base stage of one end of the first resistance 10 described in one termination of described second resistance 20 and the drain electrode of described first NMOS tube 30 and a described NPN pipe 50, other end ground connection;
The grid of described first NMOS tube 30 connects one end of described 3rd resistance 40 and the collector electrode of a described NPN pipe 50, and drain electrode connects the base stage of one end of described first resistance 10 and one end of described second resistance 20 and a described NPN pipe 50, source ground;
One termination supply voltage VCC of described 3rd resistance 40, the collector electrode of a NPN pipe 50 described in another termination and the grid of described first NMOS tube 30;
The base stage of a described NPN pipe 50 connects the drain electrode of one end of described first resistance 10 and one end of described second resistance 20 and described first NMOS tube 30, and collector electrode connects one end of described 3rd resistance 40 and the grid of described first NMOS tube 30, grounded emitter.
Described first resistance 10 and described second resistance 20 dividing potential drop obtain the base voltage of a voltage as a described NPN pipe 50, when temperature height, because the BE junction voltage of a described NPN pipe 50 is negative temperature coefficients, when temperature reaches uniform temperature, described NPN pipe 50 conducting makes output VOUT become low level; During normal work, due to a described NPN pipe 50 not conducting, such output VOUT is high level.
As shown in Figure 2, be temperature protection voltage variation with temperature figure.During normal work, output VOUT is high level; When temperature reaches preset temperature, output VOUT becomes low level.
Claims (1)
1. temperature protection circuit, is characterized in that: comprise the first resistance, the second resistance, the first NMOS tube, the 3rd resistance and a NPN and manage;
One termination supply voltage VCC of described first resistance, the base stage of one end of the second resistance described in another termination and the drain electrode of described first NMOS tube and a described NPN pipe;
The base stage of one end of the first resistance described in one termination of described second resistance and the drain electrode of described first NMOS tube and a described NPN pipe, other end ground connection;
The grid of described first NMOS tube connects one end of described 3rd resistance and the collector electrode of a described NPN pipe, and drain electrode connects the base stage of one end of described first resistance and one end of described second resistance and a described NPN pipe, source ground;
One termination supply voltage VCC of described 3rd resistance, the collector electrode of a NPN pipe described in another termination and the grid of described first NMOS tube;
The base stage of a described NPN pipe connects the drain electrode of one end of described first resistance and one end of described second resistance and described first NMOS tube, and collector electrode connects one end of described 3rd resistance and the grid of described first NMOS tube, grounded emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520844227.4U CN205092240U (en) | 2015-10-26 | 2015-10-26 | Temperature protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520844227.4U CN205092240U (en) | 2015-10-26 | 2015-10-26 | Temperature protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205092240U true CN205092240U (en) | 2016-03-16 |
Family
ID=55482899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520844227.4U Expired - Fee Related CN205092240U (en) | 2015-10-26 | 2015-10-26 | Temperature protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205092240U (en) |
-
2015
- 2015-10-26 CN CN201520844227.4U patent/CN205092240U/en not_active Expired - Fee Related
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160316 Termination date: 20161026 |