[SI-LIST] Re: Power module
- From: Hal Murray <hmurray@xxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 04 Jun 2012 23:31:30 -0700
> Perhaps a good figure to start out with is to specify about 20 to 25 percent
> higher current capacity above that required by your circuit.
One consideration is that modules are only available in a few power ranges,
typically factors of 2, so your choices are often not-quite-enough and way
more than I need.
The nasty case is when one is almost-enough, or just-barely enough. Have you
really correctly estimated the power your circuit will draw? Will the module
(and your filter caps) work from DC to GHz?
What happens if some software does 23 memory reads, thinks for the same time,
then repeats. Will your module support that sort of on/off pattern for all
frequencies?
Another version if where the CPU crunches for a while, then goes to sleep.
If it does that in a loop and the sleep time is the same as the crunch time,
you have a 50/50 on/off duty cycle which is nasty for the power brick.
--
These are my opinions. I hate spam.
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