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DIY Hobby projects, diagram, schematic

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DIY Hobby projects, diagram, schematic

LM317 Calculator

electronicecircuits, August 9, 2009September 6, 2023
LM 317 calculator

LM317 Calculator or LM317 Toolkit Software

Program to calculate the resistance at a LM317 / LM117. Because you can get correct regulated output voltage using this LM317 calculator.

lm317 calculator software, lm317 toolkit download, lm 317

The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. Also It requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. It includes current limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional even if the ADJUST terminal is disconnect.

LM317 calculation

The LM317 provides an internal reference voltage of 1.25 V between the output and adjustments
terminals. This voltage use to set a constant current flow across an external resistor divider giving an output voltage VO of:
VO = VREF (1 + R2/R1) + IADJ R2
This ic design to minimize the term IADJ (100 µA max) and to maintain it very constant with line and load changes. Usually, the error term IADJ × R2 can be neglect. To obtain the previous requirement, all the regulator quiescent current is returned to the output terminal, imposing a minimum load current condition. If the load is insufficient, the output voltage will rise. Since the LM317 is a floating regulator and “sees” only the input-to- output differential voltage, supplies of very high voltage with respect to ground can be regulated as long as the maximum input-to-output differential is not exceeded.

Also Check This post – LM317 power supply circuit schematic

LM317 Regulator design

Furthermore, programmable regulators are easily obtainable and, by connecting a fixed resistor between the adjustment and output, this device can use as a precision current regulator. In order to optimize the load regulation, the current set resistor R1 should be install as close as possible to the regulator, while the ground terminal of R2 should be near the ground of the load to provide remote ground sensing. Performance can improve with added capacitance as follow:

  • An input bypass capacitor of 0.1 µF
  • An adjustment terminal to ground 10 µF capacitor to improve the ripple rejection of about 15 dB (CADJ).
  • An 1 µF tantalum (or 25 µF Aluminium electrolytic) capacitor on the output to improve transient response In addition to external capacitors, also good practice to add protection diodes,

LM317 toolkit software is completely free but fully functional and easy to use. Finally it runs under Microsoft Windows NT, 2000, XP, Vista and Seven .

Download

Source:https://www.ulrichradig.de

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Comments (19)

  1. Rajen Shah says:
    September 18, 2010 at 6:09 pm

    This is really a useful tool

    Reply
  2. vijay lashkari says:
    October 29, 2010 at 5:59 pm

    sir i want this calculater software

    Reply
  3. Jacques STEVELINCK says:
    January 21, 2011 at 3:49 pm

    Many thanks for the LM 317 Calculator

    Reply
  4. David Cotterill-Drew says:
    March 31, 2011 at 4:46 am

    Excellent tool…works well. I needed to find R2 resistor values for a 3.3V regulator using the LM317L. This calculator solved it well…circuit was produced and tested… output voltage was 3.314V.

    Reply
  5. Ricfed says:
    April 23, 2011 at 7:22 am

    very good

    Reply
  6. manuala says:
    May 29, 2011 at 12:22 pm

    stutiy

    Reply
  7. ad.noctis says:
    September 12, 2011 at 4:25 am

    Very nice, if you have time please add the correction factor

    your formula+ Iadj*R2

    to trasform these usefull program in the LM350 calcolator too.

    Thankyou

    Marco (italy)

    Reply
  8. Henry Jose B. Cornejo says:
    January 12, 2012 at 2:10 am

    Hi, i am working on a project and i found this simple program very useful.

    Reply
  9. N A says:
    March 29, 2012 at 4:30 am

    AAAAA

    Reply
  10. Jan H says:
    May 10, 2012 at 1:58 pm

    Many thanks for the software

    Reply
  11. vu the anh says:
    November 1, 2012 at 9:12 am

    Rajen Shah :
    This is really a useful tool

    idea ,I like it thank so much for your help

    Reply
  12. ivam says:
    November 9, 2012 at 4:11 pm

    ivam :
    ok

    Reply
  13. suranga says:
    December 26, 2012 at 9:28 am

    ස්තුතියි.
    ජය වේවා……

    Reply
  14. Venelin B says:
    March 21, 2013 at 2:48 am

    Many thanks for sharing!

    Reply
  15. Jose Fernández says:
    April 28, 2013 at 12:06 am

    Muy útil y funcionando muy bien. Gracias por la aportación. By Rey

    Reply
  16. Nico Frank Costales says:
    September 2, 2013 at 11:07 am

    How can i get the software?

    Reply
  17. jun aplaon says:
    September 9, 2014 at 8:49 am

    Thank you” Very Help full tool.

    Reply
  18. ayaz mohamadzade says:
    April 23, 2015 at 12:39 pm

    vcer thanks

    Reply
  19. Pingback: LM 317 Power Supply - Electronic Circuits LM317

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