Actually, I once designed a PCB with a choice of TO-220 & DPak
regulators. The +5 output was fed through the TO220's +5 pad which fed
the power-plane which had thermal reliefs. Without burning out the
thermal reliefs, they made just enough heat generated around them to
make the unused TO220 pad black. Eventually, the thermal reliefs would
burn out.
Brad Velander wrote:
Brian,
That must be the black pad condition that follows the vaporized traces?
8^>
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
#14 - 1925 Kirschner Road,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2232 ext. 225
fax (250) 762-3374
-----Original Message-----
From: Brian Guralnick [mailto:[EMAIL PROTECTED]
Sent: Monday, August 13, 2007 8:56 AM
To: Jeff Condit; Protel EDA Discussion List
Subject: Re: [PEDA] Black Pad
Before, or, after powering up of the PCB?
____________________
Brian Guralnick
Vergent Technologies Inc.
438 Brahms Ave.
Dollard Des Ormeaux
Quebec, Canada
H9G 2S6
(514) 624-4003
[EMAIL PROTECTED]
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____________________
Brian Guralnick
Vergent Technologies Inc.
438 Brahms Ave.
Dollard Des Ormeaux
Quebec, Canada
H9G 2S6
(514) 624-4003
[EMAIL PROTECTED]
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