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  1. #21
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    Re: current-mode boost converter UC3845

    Hi,
    Datasheet says:
    PCB Layout Considerations
    To achieve best performance from an LT3782 circuit, the
    PC board layout must be carefully done. For lower power
    applications, a two-layer PC board is suffi cient. However,
    at higher power levels, a multiplayer PC board is recom-
    mended. Using a solid ground plane under the circuit is
    the easiest way to ensure that switching noise does not
    affect the operation.

    In order to help dissipate the power from MOSFETs and
    diodes, keep the ground plane on the layers closest to the
    layers where power components are mounted. Use power
    planes for MOSFETs and diodes in order to improve the
    spreading of the heat from these components into the
    PCB.
    Klaus
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  2. #22
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    Re: current-mode boost converter UC3845

    turn on your fets slower to reduce radiated noise - try 33 ohm for starters ...



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  3. #23
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    Re: current-mode boost converter UC3845

    pcb design as attached



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  4. #24
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    Re: current-mode boost converter UC3845

    thank you all
    can i use pcb trace as shunt resistor?i need two 0/008 ohm resistor for current sensing.can i use 10mm length and 0/8mm width trace(0/008 ohm resistance and 0/4 watt losses) as current sense resistor?



  5. #25
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    Re: current-mode boost converter UC3845

    Sorry no its temperature dependent.



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