UC28510 Rant

[Genome]

I've posted a schematic in PDF format to ABSE. The question is why do
they do this and why did I waste my time?

Once again, foiled by the fact that IC manufacturers seem to be
incapable of releasing ICs that are fit for use. In particular the
things just do not logically route when you bring them to the PCB.

I spend a little bit of time over schematics in an effort to allow the
person who might have to read them to make sense of the scheme of
things. I'll not claim that this one is 100%, I could do a bit more.

However, the general point is that if you look at the schematic it is,
generally, uncluttered..... there is a certain flow to it. One side of
the IC has become the PFC section, the other side is the converter
section.

It's also the case that you can almost visualise the way it might be
layed out on the PCB. The schematic is practically the PCB layout
already.

But then take a look at the way I've had to organise the pin order on
the IC to achieve this. It didn't take me long, it shouldn't take them
long but they haven't.

The net result is the IC does not logically route on the PCB.

It's shit, I'm not using it...... congratulations.

DNA

 

[Active8]

On Tue, 04 May 2004 18:28:12 GMT, Spehro Pefhany wrote:

On Tue, 4 May 2004 13:57:22 -0400, the renowned Active8
reply2group@ndbbm.net> wrote:

Amen, bro. I usually have to route critical traces, lock them down,
and place keepouts before auto routing. I was handed some boards
from a baord house once. Who routed them, I can't say for sure, but
one of the feedback resistors for one of the op amps was at an
opposite corner of the board. Nice big antenna goining into a high Z
pin, eh?

That's not a routing issue, that's a placement issue. Placement is the
hardest part of the problem. Auto-routing of digital signal traces is
now good enough for many purposes (after the power, high voltage,
sensitive and other critical ones have been locked down and keepouts
placed, as you say). But auto-placement is a sick joke. And
single-layer auto-routing is no great shakes either.

Best regards,
Spehro Pefhany

Yeah. It probably *was* auto placed. It was a double sided board.
Nonetheless, I haven't been impressed with autorouting. I've heard
that LMKS has a paid service to autoroute boards submitted via web
and that it's much better than most.
--
Best Regards,
Mike