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Power & Energy
Forum LM317 in parallel - Answered -> LM2596 circuit question
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Related

LM317 in parallel - Answered -> LM2596 circuit question

ckambiselis
ckambiselis over 12 years ago

Hello,

 

I am building a DC-DC converter to convert the 14.8v 6A power coming from a professional camera battery to 9V 2.5A used by a DSLR, I am trying to build this converter using the LM317 since it's the only easily available power regulator (which I don't have to order 2500pcs to place an order), the problem is the LM317 can only output 1.5A max, can I build the circuit using 2 of them and connecting the outputs of each circuit in paralel to get 9V 3A, is there going to be any kind of problem that may fry the camera?

 

Thank you

Oscar

 

Message was edited by: Christos Oscar Kambiselis

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Top Replies

  • mconners
    mconners over 12 years ago in reply to johnbeetem +2
    In the LM 317 datasheet http://www.ti.com/lit/ds/symlink/lm317.pdf (sorry about the pdf) figure 13 on page 12 shows three of them in parallel (of course with supporting circuitry) to create an adjustable…
  • Former Member
    Former Member over 12 years ago +2 suggested
    I invented the Lm317. It is NOT designed to be paralleled. If you parallel devices, one will supply all the current until it thermally or current limits and then the other one will come on. This not reliable…
  • mconners
    mconners over 12 years ago +1
    One thing to keep in mind is that you said you will be running this off of a battery. I think John Beetem is correct in asserting that you will be generating quite a bit of heat with this circuit. Heat…
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  • sqkybeaver
    0 sqkybeaver over 12 years ago

    the lm2596 is a good choice for a simple buck converter http://www.ti.com/lit/ds/symlink/lm2596.pdf

     

    it is avalable in through hole, and needs minimal heat sinking. and the math is straight forward right on data sheet

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  • sqkybeaver
    0 sqkybeaver over 12 years ago

    the lm2596 is a good choice for a simple buck converter http://www.ti.com/lit/ds/symlink/lm2596.pdf

     

    it is avalable in through hole, and needs minimal heat sinking. and the math is straight forward right on data sheet

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  • ckambiselis
    0 ckambiselis over 12 years ago in reply to sqkybeaver

    Sheldon the LM2596 seems to be a good choise, since I can find already assembled circuits using it even on eBay for not more than 4€, seems that I will order a bunch of them since they are adjustable and use them in my other projects too.

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