Simulating the positive temperature co-efficient using resistances
114 7
ajay.chakkaravarthy 6 days ago
Hello peeps, I am currently working on a circuit that can simulate the function of KTY81-110 temperature sensor using resistances. The value of resistances have been obtained from the datasheet of the sensor for three diffrenent temperatures. The input is derived from a DC-DC converter and the value is 9V, 111mA.  I am trying to use a constant current diode (S-102T) to maintain the current at 1mA before deriving the output from the circuit. I am consfused with the placement of the CRD in the circuit. I am still a beginner with simulating sensors. So any advice, comments or flaws in this design is welcome. Thank you people :) ![image.png](//image.easyeda.com/pullimage/OSA4fGadCACkU7jivdUJOCh91p5uFPjXxILoJvl1.png)![image.png](//image.easyeda.com/pullimage/dRP6xPuzhwmRnfhM83FzovPO208eqE1w8WTk7tvn.png)
Comments
andyfierman 6 days ago
Please post links to the datasheet and application notes for: the KTY81-110 temperature sensor and the S-102T constant current diode.
Reply
andyfierman 6 days ago
Please also read: [https://docs.easyeda.com/en/Simulation/Headings/index.html](https://docs.easyeda.com/en/Simulation/Headings/index.html)
Reply
ajay.chakkaravarthy 6 days ago
@andyfierman  The links are as follows S-102T   [https://www.mouser.de/datasheet/2/362/P22-23-CRD-1729293.pdf](https://www.mouser.de/datasheet/2/362/P22-23-CRD-1729293.pdf) KTY81-110 [https://www.nxp.com/docs/en/data-sheet/KTY81_SER.pdf](https://www.nxp.com/docs/en/data-sheet/KTY81_SER.pdf)<br> <br> Thank you
Reply
ajay.chakkaravarthy 6 days ago
@andyfierman I will definitely read it. Thanks for sharing
Reply
ajay.chakkaravarthy 6 days ago
@andyfierman I will definitely read it. Thanks for sharing
Reply
andyfierman 6 days ago
Sorry but you circuit does not seem to make sense. The top schematic will provide a constant 1mA to any load connected from output to ground and presenting a voltage drop of less than about 6V (i.e. leaving at least 3V across the S-102T). This is irrespective of any of the other components in the circuit as long as the 9V rail stays up at 9V. The lower schematic will provide a constant 9V to any load connected from output to ground, irrespective of any of the other components in the circuit, as long as the 9V rail stays up at 9V.
Reply
andyfierman 6 days ago
I think you should read this too: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)<br> <br> and: 1. think carefully about what you are trying to achieve and;  2. write a Design Requirement Specification and;  3. write a How It Works document. This will focus your mind on what you want to do and how best to achieve it. It will also help others to help you.
Reply
Login or Register to add a comment
goToTop
你现在访问的是EasyEDA海外版,使用建立访问速度更快的国内版 https://lceda.cn(需要重新注册)
如果需要转移工程请在个人中心 - 工程 - 工程高级设置 - 下载工程,下载后在https://lceda.cn/editor 打开保存即可。
有问题联系QQ 3001956291 不再提醒
svg-battery svg-battery-wifi svg-books svg-more svg-paste svg-pencil svg-plant svg-ruler svg-share svg-user svg-logo-cn svg-double-arrow
We use cookies to offer you a better experience. Detailed information on the use of cookies on this website is provided in our Privacy Policy. By using this site, you consent to the use of our cookies.