While searching for good caps, I have found out what's exactly attached to this ROK-90S4 Layer Capacitor made by Straight Ltd., Japan
Also for ROK-90V8 Layer Capacitor
According to the website, they are connected in parallel.
And you'll see on top of the caps, the ROK-90S4 use 680 uF (not sure about this 'cause I don't have the caps yet and the pics on their web is not so clear.. unless someone who has it can confirm about it) and ROK-90V8 use 220 uF (it's clear from the pic)
Both are using nichicon caps products, vertical chip-type capacitor, with the datasheet you can find here
(see the "UD" series on top of the caps).
My questions are :
1. Is it low ESR same with low impedance, cause I always see in the capacitor datasheet, they always refer to impedance not ESR
2. Looking at the datasheet tabel for 220 & 680 caps, the lowest impedance for 220uF is 0.17 at 25V/35V and for 680uF at 0.09 at 10v/16v
Some say (in other thread
) low ESR should be max. 0.05 ohm for ESC
If the caps put in parallel, the capacitance will be multiplied but will the total impedance (ESR) be divided (decrease / lower) ?
3. How about the ripple in parallel caps, will it be divided or multiplied or remain the same ?
4. What are the advantage and disadvantage of putting the caps in parallel ?
I hope someone could enlightenment....
Really sorry to ask this 'cause I'm not electrician or have knowledge about power caps....