On Sat, 16 Feb 2013 00:35:59 -0000, you wrote:
>Hello
>
>I am building a DC PWM board.
>
>I am designing my own board on diptrace that I intend to etch myself. and would like to use surface mount components.
>
>I need to use an 8 ampsurface mount diode ( http://www.electro-tech-online.com/c...6b80af50a6.pdf)
>
>
>I understand that i will need to use a heatsink but i do not now how to do this with surface mount devices.
>
>Can any one explain how this is done?
There are several ways. One involves using an extended plane of
copper, I'm not sure of the design rules for size, but you might see
them in the design specifications of the device.
Another method is to put a heatsink ∗over∗ the chip which is used to
dissipate the heat. Some chips are designed to use the leads as
heatsinks, or thermal paths to a heatsink, although the upper surface
can also be used.
The data sheet ought to tell you a bit.
Harvey
>
>Thanks.
> Charlie