225 EDLC-R ENYCAP™

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Vishay BCcomponents

Revision: 06-Apr-2022

5

Document Number: 28449

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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 UR

- Constant voltage charge at UR

- Constant current discharge with 10 mA/F to 0.1 V

Fig. 4 - Voltage Diagram for Capacitance Measurement

Capacitance value CR is given by discharge current ID, time

t and rated voltage UR, according to the following equation:

EQUIVALENT SERIES RESISTANCE (ESRDC)

- Constant current charge to UR

- Constant voltage charge at UR

- 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.

CR

Rated capacitance, in F

UR

Rated voltage, in V

U1

Starting voltage, 0.8 x UR in V

U2

Ending voltage, 0.4 x UR in V

ΔU3

Voltage drop at internal resistance, in V

t1

Time from start of discharge until voltage U1 is

reached, in s

t2

Time from start of discharge until voltage U2 is

reached, in s

ID

Absolute value of discharge current, in A

UR

U1

U2

t1

t2

ΔU3

(s)

30 min

C

R

F

[]

I

D

A

[] x t

2

s

[] - t

1

s

[]

()

U

1

V

[] - U

2

V

[]

---------------------------------------------------------------

=

ESRDC

Equivalent series resistance, in

Ω

ΔUR

Voltage drop at internal resistance, in V

ID

Absolute value of discharge current, in A

ESR

DC

Ω

[]

ΔU

3

V

[]

I

D

A

[]

---------------------

=