Re: CPCI hotswap controller design concern

I don't know anything about the parts involved but it sounds like there are
some capacitors being charged that cause an initial current surge as the
card is plugged in.



--

Dan Hollands
1120 S Creek Dr
Webster NY 14580
585-872-2606
QuickScore@xxxxxxxxxxxxx
www.QuickScoreRace.com


"minlin" <minlinf@xxxxxxxxxxxxxxxx> wrote in message
news:42c2bf18$0$18649$14726298@xxxxxxxxxxxxxxxxxx
>I posted a message here a few days ago about the hotswap controller chip
> LTC1643.
>
> I use this chip to design a CPCI card that is having a problem --the board
> gets shutdown everytime a redundant PSU or a second CPCI card is
> hotswapped.
>
> I have been trying a lot of things that are related to load, capacitance,
> etc. but none of them works.
>
> Had a break-through yesterday after checking one of other made CPCI board.
> This board's hotswap controller has a current limit set to 26Amps! So we
> tried increasing the LTC1643's sense current to a large amount (7 Amps)
> although the board itself only draws 200mA. This seems to fix the shutdown
> problem.
>
> So is this large current limit a common sense when designing hotswapptable
> CPCI card to avoid current surge during hot-swap activity?
>
> Thank you for your patient.
>
> Minlin
>
>
>
>
>


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