AVR-Chat

Kathy Quinlan wrote:
> Robert Adsett wrote:
> 
>>> 2) What is the purpose of the ferrite bead?
>> They can be used for EMI, I've not used one myself.
> 
> OK how do we select these, or are they just a one size fits most ?
> 
> People keep telling me to use them in SMPS designs, but I am still not 
> sure what I need, also which leg has the bead ? (in some designs I have 
> seen them on all legs ant thought it was more support that need)
> 
> 
Ferrite Breads,Commonly called prayer beads, that is, you see people sprinkling 
the former about when the latter would probably achieve a similar level of 
performance.

Ensure that your peak current is within spec of the ferrite performance range 
otherwise it will saturate and change from a frequency selective resistor to a 
piece of wire.


-- 
Cheers

Don