J
Joerg
- Jan 1, 1970
- 0
Jim said:Not determined yet, could be 3, 4, 5msec. In a circuit like this itJim said:[...]
"It's not cast in concrete yet but something like 24V industry rail with
tons of noise on there, coil about an ohm so it can ramp up to 3A or so
in a fraction of a msec, then must be held there for a msec or so, then
ramped down to hold (roughly 1/5th) in 100usec. All this must fit onto
the real estate of a postage stamp and dissipate next to nothing, as in
<500mW. If it doesn't it slowly cooks out the relay box, as has happened
on the heat pump controller we had in Europe."
... and "No supply rail". Of course 24V industrial means it should take
40V peaks.
Inductance?
"...held there for a msec or so"?? How many "so's"??
should not matter, I just make that time selectable with a component
such as R or C. It is something that will most likely have to be changed
later. Usually the allowed tolerance is large. If it had to be under 10%
there would always be the old CD4060 which nowadays even comes in TSSOP.
Inductance??
Around 10mH or a bit higher, also not cast in concrete yet. However, in
the end this doesn't matter much, it's just the principle of operation.
No problem to do it in all discretes but the layouter will have a cow.
Why camn't anyone make a L295 in CMOS? With all that automotive stuff
nowadays there should be a market for a 60V rated device. Maybe one of
your clients could make a profit there, although since Lopez they may
not like automotive much anymore.
Just fixed our wireless doorbell extender. Major "de-crudding", a D cell
had decided to take a significant pee. Why is it that out of a set of
leak-proof alkalines one has to leak?