5V to 3.3V 3A using AMS1117

Discussion in 'Power Electronics' started by BarryTron, May 17, 2019.

  1. BarryTron

    Thread Starter Member

    Nov 18, 2018
    70
    7
    Trying to convert 5V to 3.3V 3A using the AMS1117.

    Most diagrams online show a 1A setup.

    zzz.JPG

    What i was thinking about doing is duplicate above 3 times to get the needed 3A. Will it work?

    CCC.jpg

    Thank you for any feedback.
     
  2. Sensacell

    Moderator

    Jun 19, 2012
    2,273
    726
    No,

    Parallel voltage sources are problematic.
    They will never share the load current equally.

    Find a 3A regulator.
     
  3. Zaishens

    New Member

    Monday
    27
    1
    If you put a small resistor (10mOhm) between every pin1 and source gnd, you get a small voltage on pin1 wich will reduce the voltage depending on the current ever so slightly (max 10 mV) which is enough to devide the current pretty equally amongst the 1117 ICs. But you have to leave room for margins to not overdraw a single IC. Better is to use a 3A regulator, switching is more energy efficient than linear.
     
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