Switching Regulators

Discussion in 'General Electronics Chat' started by vladtess, Sep 9, 2011.

  1. vladtess

    Thread Starter Member

    Jan 5, 2011
    43
    1
    Hi there!!

    I know that getting linear regulators in parallel to gain a higher current is a bad idea because one would work more than the other.

    The thing is that I need higher currents and I was curious if something was possible in such case with switching regulators such as LM2576. I was thinking adding a transistor of some form or simply stacking two regulators in parallel. Would that work?

    Thanks much!!!
     
  2. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
    2,831
    89
    in linear requlator if you want more current then you can bypass it with help of transistor.
    in 78xx use pnp
     
  3. vladtess

    Thread Starter Member

    Jan 5, 2011
    43
    1
    OK. However now I'm working with the switching regulator.
     
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,392
    1,605
    I've seen multiple linear regulators put in parallel. Not the best way but it works.

    One regulator will naturally have a higher voltage then the other. Assuming a voltage foldback current limit, it puts out all the current it can until it's output nudges against the current limit, then the output drops to the point where the 2nd regulator picks up the load. So one regulator supplies all it can, the other makes up the difference.

    Sometimes that's all you need.
     
  5. Insertname

    New Member

    Mar 15, 2011
    12
    0
    If you absolutely must have equal currents drawn, have you though of using a current mirror? This would make both sections draw nearly the same current but of course would increase your component cost
     
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