[SI-LIST] Re: How to measure inrush current.

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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