EDLHW706D2R1R【PDF 1/8 页】CAP SUPER 70F 2.1V RADIAL

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Type EDL , Electric Double Layer Supercapacitors

Ultra High Capacitance, Small Case Size Options

Type EDL electric double layer supercapacitors offer extremely

high capacitance values (farads) in a variety of packaging options

that will satisfy, low profile, surface mount, through hole and high

density assembly requirements. The EDL is a cut above the standard

electrolytic capacitor in that it can act as a battery without having

to deal with the environmental or hazardous material issues that

batteries entail.

Highlights

Specifications

Operating Temperature Range

Rated Voltage Range

Capacitance Range

- Unlimited charging and discharging capability

- Recycling is not necessary

- Long Life - 15 years

- Low ESR

- Will extend battery life up to 1.6 times

- First class performance with economy pricing

–25 oC to +85 oC

2.1 Vdc to 5.5 Vdc

0.022 F to 70 F

How To Select an Electric Double Layer Capacitor

Estimated Initial Backup Time

Select the optimum supercapacitor according to applied

current

Back-up time for Type EDL Electric Double Layer Supercapacitors decreas-

es with use and over time especially when the current is large or operat-

ing at high temperature. Be sure to specify extra back-up time initially to

allow for product changes.

The internal resistance of the supercapacitor prevents drawing high

discharge currents. Select the supercapacitor capable of delivering the

peak current a t switchover to back-up mode using t he following table.

Maximum Operating (Discharge) Current

Series

SG, SD, NF

0.047 F

200 μA

–

0.1 F to

0.33 F

300 μA

10 μA

–

0.47 F to

1.5 F

1 mA

300 μA

–

3.3 F to

4.7 F

–

300 mA

10 F to

50 F

–

Back Up Time Example

Back-up time is the time it takes for the applied voltage to decay to the

cut-off voltage set by the user after applying the application’s maximum

voltage at application maximum temperature.

Example: An F Type EDL, P/N EDLF105B5R5C (Rated at 5.5 V, 1.0 F) is

charged to 5.0 Vdc. The circuit requirement is such that it must maintain a

memory circuit with a current drain of 10 μA in an ambient temperature of

+40 oC. The memory RTC cut-off voltage is 2.0 Vdc.

Using minimum capacitance, calculate the back-up time as

follows:

t = CΔV ? I = C[V0–(i?R)–V1] ? (i+iL)

C = 1.0 F–20% = 0.8 F, R=50 Ω, V0=5 V, V1=2 V, i=10 μA

Therefore,

t = 0.8 (5–0.0005–2) ? ((10+2) x10^–6)= 55 hours

And thus the initial back-up time is 55 hours. After 1000 hours,

calculate the back-up time will drop to about 38 hours.

t: Back-up time (s)

C: Capacitance of Type EDL (F)

V 0 : Applied voltage (V)

V 1 : Cut-off voltage (V)

i: Current during back-up (A)

i L : Leakage current (A)

R: Internal resistance (Ω) at 1 kHz

CDE Cornell Dubilier ? 1605 E. Rodney French Blvd. ? New Bedford, MA 02744 ? Phone: (508)996-8561 ? Fax: (508)996-3830

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