[SI-LIST] Re: How to measure inrush current.
- From: Joe Paul M <joepaulm@xxxxxxxxx>
- To: vijayanand@xxxxxxxxxxxxx
- Date: Sat, 21 Jul 2007 17:50:31 +0530
Hi Vijay,
Easiest way is ; Use a spice simulator.
Do remember to add a sensible amount of interal resistance for battery,
resistance & inductance of wires and connectors.
You have to get the input capacitor / filter details of the 48 to 3V
module you are using.
Else the error may be considerable.
(Including ESR values of cap , makes the result more closer to actual)
If you don't have any spice tool handy , download an eval version from
http://www.spectrum-soft.com/index.shtm.
Thanks
Joe Paul
Juniper Networks, Bangalore
Vijay Anand wrote:
> Hi,
> We use to hot swap our board from the backplane which is fed by -48V supply
> from a battery. In the board we are using a isolated 48V to 3.3V DCto DC
> converter which is having slow start feature. At the primary section we have
> parallel capacitors at the 48v side whose total capacitance = 44uF. At the
> secondary side (3.3V side) we have many decaps which is spread over the rails
> of 3.3V. My question is how to calculate the inrush current ? What is the
> total capacitance of my circuit whether i have to add both the capacitors in
> primary side as well as secondary side while calculating for inrush current?
> With Regards,
> Vijay anand. G
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