Also you will dissipate the energy in the semiconductor instead of the
external snubber circuit.
I'm usually very happy to get even a little power dissipation away
from the switch.....
I think if you provide sufficient margin it would be no less reliable,
but even measuring avalanche energy is not that easy and many
designers will rather avoid it. Also there is the problem that the
avalanche mode is not always well specified (depends on the
manufacturer).
The EMC issue alone usually warrants the external snubber, but I am
not opposed to rely on avalanche for transient events.
ST
On Sun, Dec 14, 2014 at 7:10 PM, 'Paul Kraemer' elespe@...
[TekScopes] <TekScopes@...> wrote:
Our experience with devices in industrial control is most manufacturers use external circuit anyway, not trusting the built in approach of the semiconductor manufacturer
Paul
From: mailto:TekScopes@...
Sent: Sunday, December 14, 2014 10:05 AM
To: TekScopes@...
Subject: [TekScopes] little bit O.T IGBT doesn't need snubber
The recent "design ideas" discussion led me to an announcement of a IGBT
that does not require a snubbing circuit
when used in the typical offline flyback PS.
Supposedly it handles this on chip and to me this is one of those "why
doesn't everyone do it this way?" moments.
Searching on the listed part number led nowhere.
Has anyone worked with these?
Thanks,
Bert
