buck converter

Discussion in 'General Electronics Chat' started by pokiko, Sep 17, 2009.

  1. pokiko

    Thread Starter New Member

    Sep 17, 2009
    3
    0
    Hi guys

    I need a power supply design has 3.3V 30A input and 2v 40A output(may adjusting the output voltage by pwm). I am thinking of build design with pic microcontrols by triggering a mosfet. I have never made such a design before so i am newbie.
    So, How can i realize such a circuit?
    Can you give me such a design examples? or any ideas about the driving part and mosfet?

    Best regards
     
  2. steinar96

    Active Member

    Apr 18, 2009
    239
    4
    Since SMPS are usually quite complicated i recommend you buy a IC that does most of the work for you for example

    http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1236

    This is a configurable 5V/3.3V switchmode regulator. This one however does not handle currents over 2A. There are also good books on the subject if you want to design one from scratch. But overall designing SMPS's from scratch is alot of work.
     
  3. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,693
    904
    What is your input power going to be?

    John
     
  4. pokiko

    Thread Starter New Member

    Sep 17, 2009
    3
    0
    input power will be nearly 80-100W. 2A output is too low for us. We need more than 40A output. And input voltage does not need to be 3.3V. It may be higher. We may do it by dc-dc step down convertor or with pwm control of mosfet.
     
  5. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,693
    904
    Is your input power AC (mains) or DC, e.g, batteries?

    John
     
  6. pokiko

    Thread Starter New Member

    Sep 17, 2009
    3
    0
    our input is a dc voltage.
     
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