Datasheet
235 EDLC-HVR ENYCAP™
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Vishay BCcomponents
Revision: 19-Nov-2019
5
Document Number: 28455
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MEASURING OF CHARACTERISTICS
CAPACITANCE (C)
Capacitance shall be measured by constant current
discharge method.
- Constant current charge with 10 mA/F to U
R
- Constant voltage charge at U
R
- Constant current discharge with 10 mA/F to 0.1 V
Fig. 3 - Voltage Diagram for Capacitance Measurement
Capacitance value C
R
is given by discharge current I
D
, time
t and rated voltage U
R
, according to the following equation:
EQUIVALENT SERIES RESISTANCE (ESR
DC
)
- Constant current charge to U
R
- Constant voltage charge at U
R
- Constant current discharge to 0.1 V
Statements about product lifetime are based on calculations and internal testing. They should only be interpreted as estimations. Also due to external factors, the
lifetime in the field application may deviate from the calculated lifetime. In general, nothing stated herein shall be construed as a guarantee of durability.
C
R
Rated capacitance, in F
U
R
Rated voltage, in V
U
1
Starting voltage, 0.8 x U
R
in V
U
2
Ending voltage, 0.4 x U
R
in V
U
3
Voltage drop at internal resistance, in V
t
1
Time from start of discharge until voltage U
1
is
reached, in s
t
2
Time from start of discharge until voltage U
2
is
reached, in s
I
D
Absolute value of discharge current, in A
U
R
U
1
U
2
t
1
t
2
ΔU
3
(s)
30 min
C
R
F
I
D
A x t
2
s - t
1
s
U
1
V - U
2
V
---------------------------------------------------------------
=
ESR
DC
Equivalent series resistance, in
U
R
Voltage drop at internal resistance, in V
I
D
Absolute value of discharge current, in A
ESR
DC
U
3
V
I
D
A
---------------------
=