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    转载自:CircuitCalculator.com


    关键词:

    PCB,Layout,电流,导线宽度。


    This Javascript web calculator calculates the trace width for printed circuit boards based on a curve fit to IPC-2221 (formerly IPC-D-275). Also see thevia calculator.

    New features:

    • Results update as you type
    • Several choices of units
    • Units and other settings are saved between sessions
    • Blog format allows user comments


    Inputs:

    Current Amps
    Thickness

    Optional Inputs:

    Temperature Rise Deg
    Ambient Temperature Deg
    Trace Length

    Results for Internal Layers:

    Required Trace Width
    Resistance Ohms
    Voltage Drop Volts
    Power Loss Watts

    Results for External Layers in Air:

    Required Trace Width
    Resistance Ohms
    Voltage Drop Volts
    Power Loss Watts


    Notes:

    The trace width is calculated as follows:

    First, the Area is calculated:

    Area[mils^2] = (Current[Amps]/(k*(Temp_Rise[deg. C])^b))^(1/c)

    Then, the Width is calculated:

    Width[mils] = Area[mils^2]/(Thickness[oz]*1.378[mils/oz])

    For IPC-2221 internal layers: k = 0.024, b = 0.44, c = 0.725

    For IPC-2221 external layers: k = 0.048, b = 0.44, c = 0.725

    where k, b, and c are constants resulting from curve fitting to the IPC-2221 curves

    For geometry diagrams, click on the pictures below.

    pcb-trace-geometry-2.png    pcb-trace-geometry-1.png

    For frequently asked questions, see the comments.

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  • 原文地址:https://www.cnblogs.com/techstone/p/3321270.html
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