DC FILTERING
FFB* RoHS Compliant
The FFB series uses a metallized polypropylene or polyester dielectric
with the controlled self-healing process, specially treated to have a very
high dielectric strength in operating conditions up to 105°C.
This is a dry solution for polypropylene and dry or wet for polyester.
The FFB has been designed for printed circuit board mounting.
Furthermore, their performances allow to be
a very interesting
alternative to electrolytic technology because they can withstand much
higher levels of surge voltage.
APPLICATIONS
The FFB capacitor is particularly designed for DC filtering, low reactive
power.
HOT SPOT CALCULATION
See Hot Spot Temperature, page 3.
θhot spot = θambient + (Pd + Pt) x Rth
with Pd (Dielectric losses) = Q x tgδ0
Q x tgδ0 [ ½ x Cn x (Vpeak to peak)2 x f ] x tgδ0
tgδ0 (tan delta)
For polypropylene, tgδ0 = 2 x 10-4 for frequencies
up to 1MHz and is independent of temperatures.
For polyester, tgδ0 values are shown in graph 4
on page 3.
PACKAGING MATERIAL
Self-extinguishing plastic case (V0 = in accordance with UL 94) filled
thermosetting resin.
2
Pt (Thermal losses) = Rs x (Irms
)
Self-extinguishing thermosetting resin (V0 = in accordance with UL 94;
I3F2 = in accordance with NF F 16-101).
where
Cn in Farad
I
rms in Ampere fꢀin Hertz
Vꢀin Volt
Rsꢀin Ohm θ in °C
STANDARDS
R
th in °C/W
IEC 61071-1, IEC 61071-2: Power electronic capacitors
IEC 60384-16: Fixed metallized polypropylene film
dielectric DC capacitors
OPERATING TEMPERATURE RANGE
IEC 60384-16-1: Fixed metallized polypropylene film
dielectric DC capacitors Assessment
level E
IEC 60384-17: Fixed metallized polypropylene film
dielectric AC and pulse capacitors
IEC 60384-17-1: Fixed metallized polypropylene film
dielectric AC and pulse capacitors
Assessment level E
(according to the power to be dissipated) -55°C to +105°C
LIFETIME EXPECTANCY
One unique feature of this technology (as opposed to electrolytics) is
how the capacitor reacts at the end of its lifetime. Unlike aluminum,
electrolytics film capacitors do not have a catastrophic failure mode.
Film capacitors simply experience a parametric loss of capacitance of
about 2%, with no risk of short circuit.
IEC 60384-2: Fixed metallized polyester
capacitors
Please note that this is theoretical, however, as the capacitor continues
to be functional even after this 2% decrease.
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or
available online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
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