FFB
DC FILTERING ELECTRICAL CHARACTERISTICSDC FILTERING FOR LOW VOLTAGEHOT SPOT CALCULATION
Capacitance rangeC
n 6.2F to 110F Tolerance on C
n 10% Rated DC voltageV
n dc75 to 400 V Dielectricpolyester θ
hot spot = θ
ambient + (P
d + P
t ) x R
th withP
d (Dielectric losses) = Q x tg δ
Q x tg δ
⇒ [
1 ⁄
2 x C
n x (V
peak to
peak )
2 x f ] x tg δ
(see tg δ
for polyester dielectric page 3)P
t (Thermal losses) = R
s x (I
rms )
2 whereC
n in FaradI
rms in Amperefin HertzVin VoltR
s in Ohm θ in CR
th in C/W
6