Current output of LM2596

Discussion in 'General Electronics Chat' started by worldHello, Nov 8, 2014.

  1. worldHello

    Thread Starter New Member

    Oct 15, 2014
    23
    0
    So I want to produce 5 V and 2 V from 12 V. My plan is to use LM2596 buck converter.

    I want the output to be 2W-10W. However, it does not give me enough current.
    When it is 12V to 2V, the output current is about 5mA. What may the issue be?


    This is for a project. Hence, it is not for powering anything. The load is simply a resistor.

    Thank you!
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    I suspect D17 is in backwards, but that is a complete guess.

    Got a schematic to post? Got picture of your build?
     
  3. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
    Is this a home work or personal practice?
    Wrong diode, wrong conductor?
    Please show the bread board or pcb with parts, some photos.
     
  4. worldHello

    Thread Starter New Member

    Oct 15, 2014
    23
    0
    This is like a homework.

    I did not put anything around my buck converter. I simply feed 12 V in to the converter. There's nothing else
     
  5. b1u3sf4n09

    Member

    May 23, 2014
    115
    14
    http://www.ti.com/lit/ds/symlink/lm2596.pdf

    Attached is a link to the datasheet for LM2596. It shows a typical circuit layout for this converter on the first page. You will have to provide the external components that are shown for your switching converter to work. This is not like a linear regulator that simply dissipates unused power as heat.
     
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