[SI-LIST] Re: current carrying capacity of Via with time

  • From: "Rich Peyton" <p2rich@xxxxxxxxxxxxx>
  • To: <hariharan@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 9 May 2003 07:31:10 -0400

I found this one during my research but have not had time to do any =
testing
to validate its correctness, so this is given as found:
-----------------------------------------

I-cont =3D Continuous Current (Need to know max current rating of via)
F=3D Fraction of "ON" time
Where F =3D Fraction of "ON" time. =3D ( ON TIME/(ON TIME+OFF TIME))

I-pulsed =3D I-cont/sqrt of F

------------------------------------------

Example:

I-cont =3D .47 amps
An "ON" time of 1 millisecond and "OFF" time of 9 milliseconds.

F=3D 1/1+9=3D0.1

I-pulsed=3D 0.47amps/sqrt0.1 =3D 1.49 amps can be pulsed through at =
1msec.

---------------------------------------------

If you or anyone else on the SI-list test out this formula let me know =
how
it compares to measurements.

Hariharan, I'd also be interested if anyone else sends you something
regarding this subject- please forward if it is not replied to SI-list =
also.


Regards,
Rich

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of hariharan
Sent: Friday, May 09, 2003 2:15 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] current carrying capacity of Via with time

Hi,

I'd like to know how to calculate whether a via can withstanda 25 amps =
of
current for 2-3 sec?

Is there any formula for this?

regards
Hariharan


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