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In Reply to: Electrolytic voltage rating in dac posted by Tweaker456 on June 25, 2016 at 13:27:58:
That specified max voltage rating for a cap it is already into a safe working area (for the specified number of working hours, and for the rated temperature), so as it is market on its body by the factory.
A cap rated 12v it can tolerate 16v, but is not recommended to work at that voltage. A 25v cap it tolerate 30v, a 63 it can do 70v and so on. The safest higher voltage a cap is rated for, it is labelled on it, and it can work very well at that max voltage (for the specified number of hours). Exception from this "rule" are the double layers caps, which even are rated for a certain max voltage, and a working temperature, for the specified working hours, it is recommended to be used at the lowest as possible voltage, to increase its life. This is because their quite special construction, enough different that the rest of the common electrolytic capacitors, widely used out there.
In my opinion, the use of two times or more higher rated voltage caps for the in fact working voltage is just stupid design. Well, there is something else when about AC rated voltages, high frequencies, or high voltage circuits. Such areas are not in discussion here, especially your question it is about (DAC device).
The subject here is is about power system filtering caps, and eventual decoupling caps.
The higher the rated voltage for a cap, the bigger its physical dimensions, and wasting of space. Fulling an inside space of a device with big caps it lower the ventilation capabilities, it increase the PCB dimensions, and so on... Not about many advantages also...
Definitely, there is not rational or any functional reason to use f. ex. a 63v rated cap for a 12v working voltage. A 63v rated cap should be used in a rational manner for a 50v working voltage area/circuit.
When about mass production consumer devices, there may be economical/financial reasons for a such use. There are deals between the device manufacturer and caps providers which favorise use of such standard voltage rated for the whole design. There are discounts involved in businesses, as another similar production/financial reasons, which it have very little to do with the in fact devices functionality, but more about organising the production, costs, profit, and so on (in this direction)...
Edits: 06/25/16
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Follow Ups
- RE: Electrolytic voltage rating in dac - Coris 15:16:12 06/25/16 (0)
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