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Document Number: 28362

166

Revision: 15-Apr-08

196 DLC

Vishay BCcomponents

Double Layer Capacitors

DISCHARGE CHARACTERISTICS

Backup time of 196 DLC series capacitors depends on

minimum memory holding voltage and discharge current

(corresponding with the current consumption of the load).

For minimum backup times of standard and vertical

miniaturized

series

see Figs 9 and 10

(charging

time

≥ 24 hours).

Figure 11 shows the backup time when a 196 DLC capacitor

is discharged by a constant resistance

(charging time

≥ 24 hours).

The horizontal axis shows the initial value of discharge

current if 5 V is connected to the capacitor via a fixed series

resistor.

EXAMPLE: 1 µA CORRESPONDS TO 5 M

Ω AND 0.1 µA

CORRESPONDS TO 50 M

Ω

The vertical axis shows that period of time during which the

voltage drops from 5 to 2 V.

Fig.9 Typical backup time as a function of discharge current

10

MGA695

1

10

3

10

2

10

backup

time

(s)

discharge current (mA)

10

-3

10

-2

10

-1

5

4

3

2

1

Curve 1: 1.0 F, 5.5 V

Curve 2: 0.47 F, 5.5 V

Curve 3: 0.22 F, 5.5 V

Curve 4: 0.1 F, 5.5 V

Curve 5: 0.047 F, 5.5 V

Voltage drop from 5.0 to 3.5 V

Fig.10 Typical backup time as a function of discharge current

10

1

10

4

10

3

10

4

backup

time

(s)

discharge current (mA)

10

-3

10

-2

10

-1

MGA696

5

4

3

2

1

Curve 1: 1.0 F, 5.5 V

Curve 2: 0.47 F, 5.5 V

Curve 3: 0.22 F, 5.5 V

Curve 4: 0.1 F, 5.5 V

Curve 5: 0.047 F, 5.5 V

Voltage drop:

from 5.0 to 2.0 V

Fig.11 Typical backup time as a function

of initial discharge current

10

3

10

10

2

10

2

10

1

backup

time

(s)

initial value discharge current (mA)

10

-2

10

-1

1

MLB203

1

2

3

4

5

Curve 1: 1.0 F, 5.5 V

Curve 2: 0.47 F, 5.5 V

Curve 3: 0.22 F, 5.5 V

Curve 4: 0.1 F, 5.5 V

Curve 5: 0.047 F, 5.5 V

Voltage drop from 5.0 to 2.0 V

by means of a fixed resistor