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trace width for 2A current

Discussion in 'Electronic Design' started by Ajab, Dec 7, 2007.

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  1. Ajab

    Ajab Guest

    What is the ideal trace width for 2A current...on a Non Impedance
    controlled board?
    I tried calculating it ..but the values are different...
    Can anyone tell me regarding this?
     
  2. Guest

    How thick is the copper? How thick is the board? How much temperature
    rise? How long?
     
  3. Ajab

    Ajab Guest

    The Cu is 0.0675 on top and 0.0350 on internal layers. Temp rise is
    not mentioned. but the system will operate in industrial area. 2A
    current is the max current. It is not constant.1.6-1.7A is the
    constant current. But sometimes 2A. board thickness is just 3.2782 .
     
  4. John Fields

    John Fields Guest

     
  5. Ecnerwal

    Ecnerwal Guest

    There is no "Ideal". There is "good enough", or preferably, "Good enough
    plus some margin for error." More is approximately always better, since
    you don't care about capacitance.

    How much room have you got? How wide can you make it?

    If you can cram in a 3/8" (centimeter) wide trace, do so. If you have to
    narrow the ends down to make things fit, do that. If your PCB program
    can't manage that, use one that can. If you are tightly space
    constrained, the question becomes more along the lines of "what's the
    bare minimum I can get away with?" Then you can work up from that if you
    can make the space. Here a a couple of guesstimators for that:

    http://www.circuitboards.com/capacity.php3

    http://circuitcalculator.com/wordpress/2006/01/31/pcb-trace-width-calcula
    tor/
     
  6. John Larkin

    John Larkin Guest

    A skinny trace, 20 mils (0.02 inches) wide maybe, can handle 2 amps.
    But you should calculate the voltage drop and see if it's going to be
    a problem.

    1 oz copper has a resistance of about 500 micro-ohms per square, and
    the number of squares is just the trace length/width ratio.

    But you're lucky to get 1 oz copper even when you specify it, so
    overkill some.

    John
     
  7. John Larkin

    John Larkin Guest

    Cool. The trace width should be NaN.

    John
     
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