[SI-LIST] Re: Pulse current handling capability of PCB
- From: steve weir <weirsi@xxxxxxxxxx>
- To: "Deepak V.L" <deepak.vl@xxxxxxxxxxxxxx>
- Date: Tue, 15 Sep 2009 05:50:08 -0700
Assuming whatever is connecting to this is not limiting, then the rule
of thumb is:
Resistive loss density = I^2*0.5mW/( copper_weight * trace_width^2 ) where:
resistive loss density is W/sq in
copper weight is in oz / sq ft.
trace width is in inches
For even something as short as 20us I would stay below 100W / sq in.
Steve.
Deepak V.L wrote:
> Hi Havermann, Pls find the answers below
>
> -is this a periodic surge event (>1Hz) or will it just happen "once a day"?
> It is not a periodic surge, It can happen only once when the system is
> switched on.
>
> -is this surge current the only current on this trace?
> Yes
>
> -are there other traces on the surrounding area that might coheat this
> trace?
> No
>
> -whats the copper weight?
> 1 oz
>
> -on which layer of how many layers
> The traces are in the external layers (dobulb sided board)
>
> Thanks,
> Depak
>
>
> ----- Original Message -----
> From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
> To: "Deepak V.L" <deepak.vl@xxxxxxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Sent: Tuesday, September 15, 2009 5:46 PM
> Subject: AW: [SI-LIST] Pulse current handling capability of PCB
>
>
> Dear Deepak,
>
> This depends on many factors:
> -is this a periodic surge event (>1Hz) or will it just happen "once a day"?
> -is this surge current the only current on this trace?
> -are there other traces on the surrounding area that might coheat this
> trace?
> -whats the copper weight?
> -on which layer of how many layers
>
>
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> Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
> Auftrag von Deepak V.L
> Gesendet: Dienstag, 15. September 2009 13:51
> An: si-list@xxxxxxxxxxxxx
> Betreff: [SI-LIST] Pulse current handling capability of PCB
>
>
> Dear Experts,
> Could someone please guide me how to select a trace width for carrying a
> 100A surge current for 20us over a PCB trace ?
>
>
> Thanks in advance,
> Deepak
>
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