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How to Multiply the Output Current of LM317


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LM317 is one of the most popular adjustable regulator chips. The output voltage of the regulator can be adjusted from 1.25V to 35V. However, the chip can deliver currents up to 1.5A which is not enough for some power applications. In this article/video, I will discuss two methods of LM317 current boosting, using power PNP and NPN pass transistors.

 

 

 

References

Article: https://www.pcbway.com/blog/technology/LM317_Current_Boosting_Secrets.html

[1]: LM317 Datasheet: http://www.ti.com/lit/ds/slvs044x/slvs044x.pdf

[2]: LM317 Library: https://componentsearchengine.com/part.php?partID=299235

[3]: MJ2955 Datashet: https://www.mouser.com/datasheet/2/308/2n3055-d-1190033.pdf

[4]: MJ2955 Library: https://componentsearchengine.com/part.php?partID=697997

[5]: 2N3055 Datahseet: https://www.onsemi.com/pub/Collateral/2N3055-D.PDF 

[6]: 2N3055 Library: https://componentsearchengine.com/part.php?partID=788620

[7]: CAD Plugins: https://www.samacsys.com/library-loader-help

 

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