CLG04P050L28 Datasheet, PDF (20/26 Pages) List of Unclassifed Manufacturers – Super Capacitors To Improve Power Performance.

Voltage Drop
Two main factors affect the voltage drop of all capacitors including EDLC's.
The first voltage drop is defined as the Ohmic voltage drop.
The capacitor has an internal resistance defined as ESR (Equivalent Series Re-
sistance).
As current flows through the capacitor, a voltage drop occurs that obeys Ohms
law. This voltage drop is instantaneous and will diminish the
moment that no current is drawn.
The second voltage drop (capacitance related voltage drop) is due to
capacitor discharge.
The voltage of the capacitor is directly proportional to the charge
accumulated in the capacitor. During current discharge, capacitance is
consumed (current emitting from the capacitor) thus causing a linear
voltage decrease in the capacitor. When the current is stopped, the voltage of the
capacitor indicates the charge left in the capacitor. The combination of the Oh-
mic related voltage drop and the capacitance related voltage drop determine the
actual working voltage window of an EDLC under drain conditions (Fig. 4).
V1
V2
Voltage
window
V3
t1
t2
Fig. 4
Pulse width
Ohmic voltage drop = V1-V2=Ipulse*ESR
Capacitance related voltage drop = V2-V3= Ipulse*(t2-t1)/C
Working voltage window = V1-V3= Ipulse*ESR+ Ipulse*(t2-t1)/C
*Where C is Capacitance
20
Revision: 21-3-10
Subject to change without notice