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You are here: Home / Power Supply Circuits / 0-60V LM317HV Variable Power Supply Circuit

0-60V LM317HV Variable Power Supply Circuit

Last Updated on August 14, 2021 by Swagatam 57 Comments

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The high voltage LM317HV series of ICs will allow to go beyond the traditional voltage limits of an LM317 IC and enable controlling supplies that may be as high as 60V.

0-60V Regulation with a Single IC LM317

Therefore now you can build a universal 0-60V regulated power supply circuit loaded with all the essential features of a work bench test power supply circuit.

Normally a standard LM317 IC power supply is designed to work with inputs not exceeding over 40V, which implies that you cannot enjoy the features of this wonderful linear device for inputs that may be higher than this limit.

Probably the developers noticed this drawback of the device and decided to upgrade the same with its improved version LM317 HV which is specifically designed to handle voltages upto 60V, meaning now you can exploit all the special features of an LM317 IC even with inputs higher than its earlier specifications.

This makes the IC extremely versatile, flexible and a true friend of all electronic hobbyists who are always looking for an easy to build yet rugged and powerful workbench power supply circuit.

Let's learn how this high voltage LM317 HV design is created for the proposed 0-60V variable power supply circuit operations.

Pinout Configuration of LM317HV

The following diagram shows the pinout diagram of the device LM317HV

Pinout Configuration of LM317HV

Image Courtesy: http://www.ti.com/lit/ds/symlink/lm117hv.pdf

LM317HV 0-60V Regulated Adjustable Variable Power Supply The Design

The next diagram shows the standard LM317HV 0-60V variable regulated power supply circuit, in fact this configuration may be universally applicable to all LM317/LM117, LM338, and LM396 IC family.

0-60V LM317HV Variable Power Supply Circuit

Referring to the design taken from its datasheet we can see that the variable resistor or the potentiometer is specified as a 5K pot, but actually this should be much higher than this value, may be around 22K for achieving a complete 0 to max adjustable output.

The input shows a 48V but we can go a bit higher than this and use upto 56V DC as the input, but please do not stretch it to full 60V as that would mean operating the device at the verge of its breakdown limit and this could make the IC vulnerable to damage.

In case you operate it with a 60V input or slightly above this, then short circuiting the output terminals accidentally could cause an instant damage to the IC, that's why it is not recommended to force the IC to work at its full throttle. Below this limit, the internal short circuit protection feature could be expected to work normally and safeguard the IC from any possible short circuiting at the output.

C1 may be included only if the shown circuit stage is over 6 inches away from the bridge rectifier and the associated filter capacitor network

C2 is optional and may be included only to improve performance which would help eliminating all possible spikes or transients in the DC line.

For achieving a fixed regulated voltage, R2 could be replaced with a fixed resistor with respect to R1, this may be calculated using the following formula:

Vout = 1.25(1 + R2/R1), 

where 1.25 is the fixed reference voltage value generated by the ICs internal circuitry.

You can also use the following software for calculating the same:

LM317 LM338 Calculator

Adding Protection Diodes and Bypass Capacitor

The next diagram shows how a couple of diodes may be added to the basic voltage regulator design for reinforcing the circuit with extra protection, although this may not be too crucial.

Here D1 protects the IC from the discharge of C1 due to an accidental short circuit of Vin with the ground line, while D2 does the same against C2 discharge.

The role of C1 is already explained in the previous paragraph, C2 is used as a bypass capacitor. C2 may be included to further improve the output DC regulation as it would help to eliminate all sorts of ripple voltages that might appear across the output.

Adding a Simple Current Limiter Stage

Although the LM317HV is internally restricted to produce not more than 1.5 amps at the output, in case the output current is required to be strictly below this limit or any other desired limit below 1.5 amp, then this feature could be achieved by adding a straightforward BC547 stage as shown below:

The diagram also shows the complete LM317HV high voltage 0-60V variable regulated power supply circuit in a pictorial format.


Here R1 refers to 240 ohm, R2 could be a 22k pot, and Rc may be calculated using the following formula for achieving the required current control feature:

Rc = 0.6/Max current limit value.

For example if the maximum value is selected to be 1 amp, then the above formula could be calculated as:
Rc = 0.6/1 = 0.6 ohms
the wattage of the resistor could be calculated as given under:
0.6 x 1= 0.6 watts
The diode in the bridge rectifier should be preferably 1N5408 diodes for ensuring a smooth rectification with no heating issues.
C1 may be anything above 2200uF/100V, although lower values will also do for lower current loads and for non critical loads which do not mind slight ripple factor in the line.
The transformer could be a 0 - 42V/220V/2amp.
The 0 - 42V is recommended because after rectification and smoothing this final DC could exceed a little over 55V.

The next article we might possibly discuss regarding the various application circuits using the LM317HV high voltage regulator IC.

PCB Layout (with reference to the second diagram)
get free help for circuit diagrams

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  1. Madhav says

    June 22, 2022 at 8:54 am

    Dear Swagatam:
    Greetings.
    My LiFePO4 battery pack is being designed for 72 volts (nominal) with 23 cells in series and 58 cells in parallel amounting to 25kwH. I will be needing a charger at 230v AC input, and can take care of the demand for 78v at 100 amps. I am unsure if such a circuit can be built as a single unit. Can you help with a circuit, where I can put two or three modules in parallel with each of them at 78v, to arrive at the desired current rating? Thanks in advance.

    Reply
    • Swagatam says

      June 22, 2022 at 10:58 am

      Dear Madhav, a charger circuit with auto cut off can be built but you will require a transformer which can convert the 230V into 78V 100 amps for the batteries

      Reply
  2. Suat Kaleli says

    May 21, 2022 at 8:19 pm

    Hi Swagatam;
    I have test for LM317; input is 23 V output is 12 V load is 0.32 A. LM317 is overheating. My I have your opinion. Thank and regards

    Reply
    • Swagatam says

      May 22, 2022 at 9:43 am

      Hi Suat, yes if the input/output voltage difference is high then any linear regulator will heat up, you can do nothing about it except connect a large heatsink, or do fan cooling. A capacitive current dropper is the best method which can be connected to 23V AC and then rectified for the motor and meter.

      Reply
      • Suat Kaleli says

        May 22, 2022 at 10:32 am

        Okey Sir,
        then since my source transformer output is 23 AC and it is necessary to place capacitor after the rectifier and then DC output is 33 DC. That is over burden to LM317 or even 7812. As far as I understand your evaluation, I should either change my transformer or lower the AC input source to about 15 V. So I should search the second choice first. Kind Regards

        Reply
        • Swagatam says

          May 22, 2022 at 12:17 pm

          Hi Suat, yes using a 12V transformer will quickly solve the heating issue.

          Reply
  3. Suat Kaleli says

    May 15, 2022 at 2:52 pm

    Hi Swagatam;
    by considering above statement; “C1 above or min. 2200 mF”, let’s use 2200 or 6800 mF then in the aspect of output dc voltage, result would be same or 6800 is would be more effective? Regards

    Reply
    • Swagatam says

      May 15, 2022 at 4:25 pm

      Hi Suat, the higher the value of C1 the better will be the filtration. 2200uF is a reasonable value, but higher values can be tried for improving the output DC further.

      Reply
      • Suat Kaleli says

        May 16, 2022 at 12:01 pm

        Hi Again Swagatam;
        Sorry just to completely understand the matter let me ask; for instant I have transformer input 220 and output 24 V and 100 VA. (I think app. 4 Amps) When I use 2200 mf capacitor as a filter after diodes I measure about 34 V output. In case I would have used 3300 mF then the gain would be more output voltage or more stable voltage? and also please comment what about the output current would be the same, less or higher?-thanks and kind regards

        Reply
        • Swagatam says

          May 16, 2022 at 2:33 pm

          Hi Suat, the gain will be more stable voltage at higher loads. Max current will remain 4 amps only, but higher capacitor values will ensure that the output doesn’t drop with increasing loads upto 4 amps.

          Reply
          • Suat Kaleli says

            May 18, 2022 at 7:52 am

            Hi Swagatam;
            Thanks a lot the above info is highly precious for me. Then please advise if it is possible to place the capacitors as parallel to increase the capacity. For instance to use 2 of them as 2200 mF 35 V plus 3300 mF 63 V. Or capacitors voltage values should be the same too? Regards

            Reply
            • Swagatam says

              May 18, 2022 at 9:56 am

              Hi Suat, you can put the capacitors with different voltages in parallel, but the minimum voltage of a capacitor should be at least 1.5 times the DC output of the power supply. Higher voltage values than this will be OK, no issues.

              Reply
              • Suat Kaleli says

                May 20, 2022 at 10:12 am

                Thanks Swagatam;
                Power supply input 220 AC output is around 22 V DC but after bridge diode and capacitor that arises to 33 V DC. So, then I should consider 22 x 1.5= 33 V or 33 x 1.5= 50 V? For instance I have 35 V capacitor That will be any issue or tolerable? Regards

                Reply
                • Swagatam says

                  May 20, 2022 at 10:58 am

                  Hi Suat, a 35V capacitor can be too risky and might blow off if accidentally the DC across it exceeds above 35V. That is why, for better safety a 1.5 times more value is recommended. So a 50V capacitor is recommended for a 33V supply.

                  Reply
  4. BIVASH says

    April 26, 2022 at 2:04 pm

    Please suggest me a circuit diagram of a 60v 30a (1800watt) variable power supply.

    And also give a 1800 watt power supply diagram. Because I’m not able to find it nearby

    Reply
    • Swagatam says

      April 26, 2022 at 5:44 pm

      You can try the following circuit:
      https://www.homemade-circuits.com/lm317-variable-switch-mode-power-supply/
      replace the Q1 transistor with three IRF9540 mosfets in parallel, mounted over a common heatsink
      Also make sure to use very thick wires for the inductor L1.

      First test the original low current version, if you succeed with it, only then go for the upgrade

      Reply
  5. Bivash Banerjee says

    March 27, 2022 at 9:28 am

    I want to make a diy 0-60v and 0-20a variable power supply, using the diagram, the voltage issue has solved, but what about the amps?

    I have tip3055 transistor, can I use them anyhow?

    And what should be the wattage to power this kind of variable power supply?

    Reply
    • Swagatam says

      March 27, 2022 at 10:55 am

      You can do it by implementing the following design:
      high current LM317 power supply through 2N3055 emitter follower

      Reply
      • Bivash Banerjee says

        March 27, 2022 at 2:41 pm

        Is it capable to give 0-60v and 0-20a output?

        Reply
        • Bivash Banerjee says

          March 27, 2022 at 2:42 pm

          And because of I want a output voltage of 60v, should I use lm317hv instead of lm317?

          Reply
          • Swagatam says

            March 27, 2022 at 6:32 pm

            Yes that’s correct! You must use LM317HV

            Reply
        • Swagatam says

          March 27, 2022 at 6:33 pm

          If you use minimum 4nos of 2N3055 then 20 amp can be achieved.

          Reply
  6. HARISH PATEL says

    August 31, 2021 at 10:38 pm

    hi swagatam
    In this circuit can i use multiple lm317 hvt. How can i add cc control pot for 100 ma to 10 a. i m trying to make power supply 0-55 v and 10 amp.
    thank you
    harish

    Reply
    • Swagatam says

      September 1, 2021 at 9:27 am

      Hi Harish, in the second last diagram you can modify the Rc and the BC547 stage using the method shown in the following article:

      https://www.homemade-circuits.com/simple-current-sensor-circuit-modules/

      yes you can use multiple ICs in parallel just make sure to mount them closely over a common aluminum heatsink

      Reply
  7. HARISH PATEL says

    August 13, 2021 at 2:29 am

    hi swagatam
    i love ur website sir it is very informative.In above circuit if i want to add cc control how can i add.also if i want 10 amp can i add 7 lm317hv in parellel.I m trying to build 0-60 V 10 A with cc and cv control.
    thank you
    harish patel

    Reply
    • Swagatam says

      August 13, 2021 at 9:54 am

      Thank you Harish, yes you can connect the ICs in parallel and mount them over single common heatsink. However for 10 amps you may have to use 10 ICs in parallel. It is required to keep a 0.5 Amp margin for each IC, otherwise the ICs can heat up a lot.

      for CC you can apply the second concept from the following article:

      https://www.homemade-circuits.com/how-to-build-simplest-variable-power/

      Reply
      • HARISH PATEL says

        August 14, 2021 at 8:01 am

        hi swagatam
        do i have to use two seprate lm317hv for cc and cv ?
        thank you
        harish patel

        Reply
        • Swagatam says

          August 14, 2021 at 9:52 am

          Hi Harish, no need of using separate devices for the CC and CV, the BC547 will be able to provide the CC feature for the all the ICs combined, and the pot will enable the CV for the common output.

          Please see the example layout in the second last figure above.

          Reply
  8. Yukihiro KATO says

    March 1, 2021 at 4:28 pm

    Hello Swatatam, I changed the regulator to LR12 and tested it. Since the maximum current of my application is about 20mA, I decided that there is no problem with the rating of this regulator. The result is good. R1 = 1,5K, R2 = 100K/VR, C2=0.1μF, The output voltage could be adjusted up to about 70V. Thank you very much for your help. 73 de JF1BQS

    Reply
    • Swagatam says

      March 1, 2021 at 7:19 pm

      That sounds great Yukihiru! Glad you could achieve the required results so easily, please keep up the good work!

      Reply
  9. Yukihiro KATO says

    February 23, 2021 at 6:14 am

    Hello Swatatam, I enjoy ham radio and homebrew in Japan. The vacuum tube type regenerative receiver I made requires a stable 50V voltage to stabilize the regeneration. When using this LM317HV, I think that R1 = 240Ω and R2 ≒ 9400Ω are all right, but how much capacity do you think C1 needs? The maximum current is about 10mA. Please let me know if you have any other notes too. Yukihiro

    Reply
    • Swagatam says

      February 23, 2021 at 4:29 pm

      Hello Yukihiro, glad to know about your ham radio interest. You may find a few ham radio circuits in this blog too!
      The capacitor around the LM317 is actually not critical at all, if your source power supply is a good DC, and as long as your LM317 circuit is not situated far away from the power supply DC source. So C1 could be any value, but the voltage of C1, and C2 must be typically 1.5 times or 2 times higher than the maximum voltage that could be achieved from the LM317 output

      Reply
      • Yukihiro KATO says

        February 25, 2021 at 10:05 am

        Hi Swagatam, Thank you for your comment. I was relieved with your suggestion. Since the DC source is in the same box, there is no problem with distance. I tested with C1 = 0.1µF and C2 = 10µF and got good results. But I found another problem. The voltage applied to this LM317HV will be about 80V until the active of the vacuum tube stabilizes. It hasn’t failed so far, but I’m worried about the future, so I’m looking for a another regulator that can use a higher voltage input. I feel like I can use Microchip’s LR12N3-G. Your blog is easy to understand and very good contents. Thanks again. Yukihiro

        Reply
        • Swagatam says

          February 25, 2021 at 8:05 pm

          You are welcome Yukihiro! yes 80 V seems to be a bit high for the LM317HV as the max limit is 60 V.
          LR12 will do but the current output will be only 100 mA, if it suits your application, then no problem…

          Reply
  10. Buck says

    February 5, 2020 at 9:19 am

    Mr. Swagatam, last weekend I successfully built a multi-volt power supply using an LM338 regulator and a 10k ohm pot to power a mini subwoofer amp. I used the existing transformer of the non-working subwoofer(output current unknown). I set the pot to give me 24vdc out. I was getting pretty decent sound at a very low volume setting. But when I turned the volume up a few notches to test, the sound abruptly stopped. I discovered that R1 had burned up. I’m not sure if the pot was ruined or not. Instead of killing the voltage, it increased it from 24vdc to 39vdc, so I may have ruined the subwoofer amp as well. Since I have no info on the transformer’s output(it’s fairly large), I didn’t know how to determine the wattage for the resistors. Any suggestions on how I can beef things up? Thanks for any help.

    Buck

    Reply
    • Swagatam says

      February 5, 2020 at 1:38 pm

      Hello Buck, that looks strange, R1 is protected by the pot resistance, and if the pot resistance is reduced to zero, the output voltage would also reduce to 1.25V, so apparently there’s no chance of R1 burning, unless the IC itself is faulty or duplicate this can never happen. Please check your IC output voltage response to confirm if the IC is working.

      Reply
      • Buck says

        February 5, 2020 at 8:10 pm

        Thank you, sir. Will check it out, and let you know.

        Reply
        • Swagatam says

          February 5, 2020 at 8:21 pm

          No problem!

          Reply
          • Buck says

            February 6, 2020 at 6:04 am

            Mr. Swagatam, I checked the LM338, and I measured 38.9 vdc on all three legs. I had removed the burned out R1 and the pot, which was sparking when I turned it, so It looks bad too. By the way, I have the LM338 fastened to the back plate heat sink, but electrically isolated from it with insulators. I ordered a pack of five of those and they look new. FYI, the R1 I used was 1/2 watt.
            Buck

            Reply
            • Swagatam says

              February 6, 2020 at 1:10 pm

              Mr. Buck, 38V on all pins clearly indicates the IC is damaged, so probably the IC also needs to be changed

              Reply
            • Buck says

              February 7, 2020 at 7:10 am

              Wow, that’s bizarre. I’m trying to figure out what caused the failure in the first place. I turned up the volume a little, which drew more current from the power supply, which then fried R1 and apparently the pot as well, and probably the amp. You said that R1 failing should’ve only caused the IC to shut down, not open up. If the same holds true for the pot, then it looks like the IC may have been faulty to begin with. I’ve seen a few sources say there are fake LM338’s out there, so I’m wondering now if I got some. If anyone else has experienced this, I would like to hear about it. Thanks again, Mr. Swagatam. I really appreciate the guidance.
              Buck

              Reply
              • Swagatam says

                February 7, 2020 at 12:43 pm

                Actually I meant to say the opposite, it is the R1 and the pot which got damaged due to a faulty IC, otherwise R1 has no chance of failing.

                Reply
            • Buck says

              February 22, 2020 at 10:03 am

              Mr. Swagatam, I just wanted to let you know that I finally got my power supply to work. I burned up a total of three LM338’s from two different suppliers, two R1 resistors and one pot. On the fourth try, I decided to not solder the LM338 onto the board, but instead butt crimped three flying leads to it and then soldered those to the board. I was wondering if maybe I was damaging them during the soldering process. I also decreased the ac voltage of the transformer and went from 24 vdc to 15 vdc by using the center tap instead of the outer leads. Even at 15 vdc, the subwoofer puts out so much bass that I can’t turn it up very high. I just wanted to say thanks again for your help. Your website is a great resource.

              Reply
              • Swagatam says

                February 22, 2020 at 12:37 pm

                That’s great Buck, however a normal soldering will not damage the IC unless the leads are continuously touched for more than 10 seconds. Also, 24 V is perfectly within the specs of the IC so again that is fine. Anyway, glad you could sort it out finally.

                Reply
  11. Tolu says

    June 16, 2018 at 9:14 pm

    Hello sir, please I need a 90v high voltage regulator input to 0-24v output. Thanks

    Reply
    • Swag says

      June 17, 2018 at 10:16 am

      Sorry I do not have this at the moment

      Reply
  12. Kesav.N says

    January 13, 2018 at 9:12 am

    Hai sir…
    I have few doubts in Protection diode using in LM317…
    If we use protection diode D1,D2 in lm317 .it will protect the o/p short circuit…
    If vout short circuit to gnd what happen to ic..ic will damage or not…
    In our college lab many varaible power supply damages due to o/p short circuit…
    So by using protection diode in lm317 it will help or not..

    Reply
    • Swag says

      January 13, 2018 at 11:26 am

      Hi Kesav,

      LM317/LM338 ICs are internally protected from short circuit, overload current and from over heating (thermal protection) so it is virtually indestructible.

      the indicated protection diodes are actually not required, because its job is to protect the IC if a short circuit is made from the input side of the IC with a high value charged capacitor connected at the output side.

      Since the above possibility is quite unlikely, the shown protection diodes actually do not own much importance, and is not relevant to output short circuit situation….

      Reply
      • Kesav.N says

        January 13, 2018 at 1:58 pm

        Okay sir…
        But when o/p short circuit happens the IC get more heating…
        I’m so affair whether the ic will damage…
        If there any protection circuit available pls share me sir…
        Bcs many power supplies are got damaged..in college lab..
        I’m using 18-0-18v Transformer 1Ampere…
        How much size heat sink required for IC317

        Reply
        • Swag says

          January 13, 2018 at 2:22 pm

          LM317 already has all the protections in-built so no external means are required, when it heats up beyond a certain level the IC will shut down automatically until the heat returns to lower levels.

          you can use the following type of heatsink, and make sure the IC is original, duplicates may not have the above mentioned protections…

          https://3.bp.blogspot.com/-C_5QfBQJ9DM/WlnIPyaVA1I/AAAAAAAARaA/kGOJApt7Uo4qU-coCYtfbJJzE5o2CevZgCLcBGAs/s1600/208265.jpg

          Reply
          • Kesav.N says

            January 13, 2018 at 3:06 pm

            Thank u sir….
            I’m using ic company name is ST…
            Is this company good sir…

            Reply
            • Swag says

              January 13, 2018 at 6:06 pm

              yes it is good, but the problem is that duplicate companies can also put fake prints, but no problem mostly it should be original

              Reply
  13. ashok says

    September 6, 2017 at 10:35 am

    Sir I have some led driver which input is 24 volt AC and out is 54 volt dc.i want to opret it without transformer.can it possible 220 v drop into 24 volt AC or any other ideas.please suggest me.thanks in advance.

    Reply
    • Swag says

      September 6, 2017 at 11:57 am

      Ashok, that may be possible only through a 24V transformer or through another 220V to 24V SMPS…..

      however you can try a capacitive power supply also, using the following concept:

      https://www.homemade-circuits.com/2016/07/scr-shunt-for-protecting-capacitive-led.html

      replace the zener with a 24V zener in the design

      Reply
  14. Amadeu Mendes says

    July 20, 2017 at 12:25 pm

    Hello Mr. Swagatam.
    Is it possible to change this circuit giving a boost in amperage?
    Thanks.

    Reply
    • Swagatam says

      July 20, 2017 at 1:53 pm

      Hello Amadeu, yes that may be possible by implementing the following concept in the above design

      https://www.homemade-circuits.com/2016/10/lm317-variable-switch-mode-power-supply.html

      Reply
      • Bivash Banerjee says

        March 27, 2022 at 9:25 am

        Can’t it be done by adding multiple tip3055
        Power transistor in parallel?

        Reply

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