Mosfet as voltage regulator

Discussion in 'General Electronics Chat' started by Avijit Palit, Aug 4, 2017.

  1. Avijit Palit

    Thread Starter Member

    Jul 19, 2017
    81
    1
    May I use any other mosfet as voltage regulator?
    Such as C4106, P40NF, C5027
    [​IMG]
     
  2. Papabravo

    Expert

    Feb 24, 2006
    12,158
    2,669
    Last edited: Aug 5, 2017
  3. Avijit Palit

    Thread Starter Member

    Jul 19, 2017
    81
    1
    My smps output is 12 volt 20 amp. Which IC should be used as voltage regulator?
    LM317, LM7805, LM350 or LM338
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    9,647
    1,110
    LM317 can be used
    Next do not ask for us to make a circuit.
    Google it first.
     
  5. crutschow

    Expert

    Mar 14, 2008
    22,216
    6,472
    Not if he wants 20A. :eek:
     
  6. Avijit Palit

    Thread Starter Member

    Jul 19, 2017
    81
    1
    Then what is this site for?
     
  7. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    9,647
    1,110
    To help you not to spoon feed you.
    We do not design and make things for any one who do not have the time to do a simple search and study it and try it.

    You need to find a circuit or design one and ask help for it if you ran into a road bump
     
  8. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    9,647
    1,110
    He can always use a current amp to get it up ;)
     
  9. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    9,647
    1,110
    SMPS ???
    What voltage are you regulating ??

    What are you trying to do ??
     
  10. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    9,709
    2,345
    The 12V is already regulated. What voltage do you want to reduce it to?
     
  11. Avijit Palit

    Thread Starter Member

    Jul 19, 2017
    81
    1
    I want to make a variable bench power supply with the help of a smps which output is 12volt 18amp.
     
  12. bertus

    Administrator

    Apr 5, 2008
    19,550
    3,984
    Hello,

    When you want to use the LM317 as regulator, you will get a max of about 10 Volts on the output as the LM317 needs some voltage to regulate.
    Also the current will be limited to about 1.5 Amperes, as the LM317 can not handle more.

    Bertus
     
  13. dl324

    AAC Fanatic!

    Mar 30, 2015
    8,305
    2,005
    Why didn't you say so in the first place?

    In addition to a MOSFET, you need an inductor, capacitor, diode, and circuit to control output voltage. There are many references on the Web.
     
  14. ak52

    Member

    Oct 15, 2014
    195
    5
    18amps current for a bench power supply is a bit of an overkill!!!
    Assuming you want a voltage less than or equal to 12 volts, you will need to build a step down converter or a buck converter.
     
  15. wayneh

    Expert

    Sep 9, 2010
    16,099
    6,212
    Agreed. The first project many of us do on the bench is to make an LM317 circuit to control voltage to our breadboard. Most projects don't need more than 100mA or so, and the capabilities of the LM317 are more than adequate for this. It might even be thought of as a protective device for the breadboard, since the LM317 is not going to pass enough current to seriously damage everything.

    Don't move to higher power supplies until you're in control and understand the risks.
     
    absf likes this.
  16. Avijit Palit

    Thread Starter Member

    Jul 19, 2017
    81
    1
    I know that 18 amps is very high and dangerous. Then, is there any option to control to limit current without droping voltage.
     
  17. Avijit Palit

    Thread Starter Member

    Jul 19, 2017
    81
    1
    There is a convention of measurement that everyone measure electronics components as voltage that is 3 volt led or 12 volt motor etc. But current is another unit to considered to be measured. For example, a 12 volt motor can not run on smps (output 12 volt, 18 amps). Sorry for stupid english.
     
  18. GopherT

    AAC Fanatic!

    Nov 23, 2012
    7,983
    6,779
    What is the goal of your bench power supply? I electronics, motors, heater, LED lighting? Also, what is the rating of your LEDs, motor, or what every you plan to do with it.

    Note that your request for 12V 20A (240 watts) needs 240W from an AC wall socket.
     
  19. Avijit Palit

    Thread Starter Member

    Jul 19, 2017
    81
    1
    What should be the standard amount of current for 12 volt output source?
     
  20. dendad

    Distinguished Member

    Feb 20, 2016
    2,748
    738
    Some of your comments and questions make no real sense. I suggest you read up on some basic electronic theory and get to understand that first. There have been some good reference sites shown to you on other threads if I remember rightly and it would help you a great deal to follow them up. Then if you get stuck, you can ask real questions with meaning.
     
Loading...