Datasheet

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Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
13
KEMET Organic Capacitor (KO-CAP
®
) – Automotive Grade
T591, T598, T597, and T599 High Humidity and High Temperature Automotive Grade Polymer Electrolytic, 2.5 - 50 VDC
Ripple Current/Ripple Voltage
PermissibleACripplevoltageandcurrentarerelatedto
equivalent series resistance (ESR) and the power dissipation
capabilitiesofthedevice.PermissibleACripplevoltage
whichmaybeappliedislimitedbytwocriteria:
 1.ThepositivepeakACvoltageplustheDCbiasvoltage,
ifany,mustnotexceedtheDCvoltageratingofthe
capacitor.
 2.ThenegativepeakACvoltageincombinationwith
biasvoltage,ifany,mustnotexceedtheallowablelimits
speciedforreversevoltage.SeetheReverseVoltage
sectionforallowablelimits.
Themaximumpowerdissipationbycasesizecanbe
determinedusingthetableatright.Themaximumpower
dissipationratingstatedinthetablemustbereduced
withincreasingenvironmentaloperatingtemperatures.
Refertothetablebelowfortemperaturecompensation
requirements.
Temperature Compensation Multipliers
for Maximum Ripple Current
T≤45°C
45°C<T≤85°C
85°C<T≤105°C
T≤125°C
T≤150°C
1.00
0.70
0.25
0.25
0.20
T = Environmental temperature
The maximum power dissipation rating must be reduced with increasing
environmental operating temperatures. Refer to the Temperature
Compensation Multiplier table for details.
Case Code
EIA
Case Code
Maximum Power
Dissipation (Pmax)
mWatts at 45°C
with +30°C Rise
B
3528-21
127
D
7343-31
225
P
2012-10
25
S
3216-12
60
V
7343-20
187
X
7343-43
247
UsingthePmaxofthedevice,themaximumallowablerms
ripplecurrentorvoltagemaybedetermined.
I(max) = √Pmax/R
E(max) = Z √Pmax/R
I = rms ripple current (amperes)
E = rms ripple voltage (volts)
Pmax = maximum power dissipation (watts)
R = ESR at specied frequency (ohms)
Z = Impedance at specied frequency (ohms)