Information

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10
Gold Capacitors Technical Guide
Principles and Operation of Gold Capacitors
2-4-5 Discharging Characteristics
Self discharge characteristics
The self discharge characteristics of an electric double
layer capacitor are shown in equation (5).
With a fully charged capacitor, the amount of voltage that is lost
at the terminals is equal to the amount caused by the self-dis-
charge leakage current. However, if the capacitor has not reached
the fully charged state, the rate at which the terminal voltage
changes over time is shown in Fig.15.
Characteristics of Constant Current and Constant Resistance Discharging
The time required for the constant current and constant resistance discharging are respectively presented by the
equations (6) and (7) below:
The above equations may not always be accurate, as the terminal down voltage must be considered after the start of
discharge if load resistance or load current is present.
Backup Characteristics for IC
If the capacitor is used as a back-up for an integrated circuit, the V-I characteristics of the integrated circuit must
also be considered. It can, therefore, be said that if the voltage is low, the current is also low and the actual back-up
time will be longer than that calculated. To be certain that the capacitor selected is of suffi cient value to maintain the
necessary energy and time, it should be checked and measured under actual operating conditions.
2-5 Features
The capacitance of an electric double layer capacitor can be expressed by equation (8):
(6)
(7)
(5)
where R
L
is insulation resistance
(8)