Datasheet

使 Application Guidelines
- 5 -
Index
Discharge Characteristics
EDLCESR
EDLC discharges with a sloping voltage curve. When determining the capacitance and ESR requirements
for an application, it is important to consider both the resistive and capacitive discharge components. In
high current pulse applications, the resistive component is the most critical. In low current and long duration
applications, the capacitive discharge component is the most critical.
It () Vdrop
Vdrop = I (R+t/C)
使ESR (R) EDLC
使 (C) EDLC
The formula for the voltage drop, Vdrop, during a discharge at I current for t seconds is:
Vdrop = I (R+t/C)
To minimize voltage drop in a pulse application, use an EDLC with low ESR (R value).
To minimize voltage drop in a low current application, use an EDLC with large capacitance (C value).
Charge Methods
EDLC
EDLC
使EDLC
EDLCESR
EDLC can be charged using various methods including constant current, constant power, constant voltage or
by paralleling to an energy source, i.e. battery, fuel cell, DC converter, etc. If an EDLC is configured in parallel
with a battery, adding a low value resistor in series will increase the life of the battery. If a series resistor is
used, ensure that the voltage outputs of the EDLC are connected directly to the application and not through
the resistor; otherwise the low ESR of the EDLC will be nullified. Many battery systems exhibit decreased life
time when exposed to high current discharge pulses.