How to make high current regulated power supply

Discussion in 'The Projects Forum' started by TINTIN2015, Jun 12, 2015.

  1. TINTIN2015

    Thread Starter New Member

    Apr 6, 2015
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    0
    I want to build a 15 Volt 9 Amp power supply using a center tap transformer , 2N3055, LM317.
    The transformer output is 32 volt. I need the circuit diagram.
    Thanks in advanced.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    You would better have a look at the LM338, wich is capable of 5 Amps on its own.
    In the datasheet on page 10 there is a circuit on how to use 3 of them in parallel upto 15 Amps.

    Bertus
     
  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,544
    1,251
    Or another variation on page 14. If you want to use the classic one-transistor current booster circuit with a 317, the power transistor needs to be PNP.

    ak
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Here is a well-written treatment of the subject...

    For the regulator, if you are set on using 2N3055s (NPN), use a LM337 (1.5A, TO220, negative, adjustable). See the data sheet.

    This way, the collector of the 2N3055 can be connected to the minus terminal of the supply, which can be chassis ground if a floating supply is not needed.
     
    Last edited: Jun 12, 2015
  5. crutschow

    Expert

    Mar 14, 2008
    13,033
    3,241
    Alternately you can use the common/cheap 2N3055 power NPN, along with a small PNP, such as the 2N2907, in a Sziklai pair, which together act as a high-gain, power PNP (in the Wiki article schematic the polarities need to be reversed with Q1 the 2N2907 and Q2 the 2N3055, as discussed in paragraph 3).
     
    Last edited: Jun 12, 2015
    RichardO and Dr.killjoy like this.
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
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