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Inductors, DC-DC conversion, power management question

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binaryninja

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I am looking a dc-dc converter design using a switching regulator. The schematic shows an inductor on Vin. What is the purpose of having an inductor before the conversion? I should mention there is also a cap to ground after the inductor.
E.G.

Vin ------mm--------> LM2595 -----> Vout


Thanks!
 

That inductor / capacitor is to suppress conducted emissions
(from the converter pulsed current-draw) headed back to the
source. The capacitor provides the real-time charge reservoir
since the inductor blocks abrupt current changes. These two
elements' parasitic resistances will figure in overall efficiency
(input cap ESR especially).
 
Thanks for replying! Is that something that is necessary to have? National Sem. has a webench program to help with power designs... none of them have inductors on the voltage input.
 

It is necessary if your customer insists on you not polluting
the local ether. It does nothing for the function per se, just
makes you a better neighbor.
 
Haha... agreed. Thanks for the help! I assumed it had to do with current transients but wasn't sure.
 

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