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PICList Thread
'[OT] Power Supply Confusion'
1999\04\02@154718 by David Olson

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Folks,

Background:

Vi = 12v (automotive and all the baggage it brings)
RS485 network of PICs and the peripherals they control - switches, sensors,
displays
2 pair STP for cabling - bus and power

I need to design a power supply scheme that can power this network. From
reading the archives, I've noticed that there are, at least, two paths to
go:

1. Simple LM2490 setup (which there seems to be a lot of PIClist data).
2. More complicated switching setup (not as much data).

Since there won't usually be power where the peripherals are, I have to push
5v through the wire. My concern is that the LM2490 path won't be as reliable
as a legitimate power supply solution and I'm considering clean, abundant
power to be a necessary foundation in this plan. The last thing I want to do
is rework the supply circuits after this thing goes into beta.

Have any of you messed around with switching supplies in under-the-hood
automotive circuits? Any gotchas (other than the obvious spikes and dumps)?

I'm the process of ripping apart a dead Bosch Motronic ECU (engine
management) box to figure out what they do. While it's not an RS485-bus
setup, the damn things are real reliable.

Thanks.

David Olson

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