[Mobile-Portable] Big Farad versus Hybrid Caps?

[kd4e]

Someone asked if the ESR requirement changes if one uses 
only part
of the charge in the cap, e.g. one anticipates mazimum 75A peak
surges and installs a cap rated at 300A.

WDYT?

>> What is the ESR you would say is necessary for effective results?
> 
> Rough Order of Magnitude you want 1/RC to be of order the frequency of 
> the load variation that you're trying to smooth. So, for C = 1 F and f = 
> 1kHz you want R < 1 milliOhm.
> 
> Consider this device 
> <http://www.maxwell.com/pdf/uc/datasheets/BC_15V_PAK_power_1009645_rev4.pdf> 
> 
> 
> 20F and 32 mohm ==> 1/RC = 1.6 Hz that's not  useful for load variation 
> at audio frequencies.

-- 

Thanks! & 73, doc, KD4E
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