DC FILTERING
18 ■ JUNE 2015
Medium Power Film Capacitors
FFV3 (RoHS Compliant)
The series uses a metallized polypropylene or polyester dielec-
tric, 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 FFV3 has been designed for printed circuit board mounting.
DC FILTERING
APPLICATIONS
The FFV3 capacitors are particularly designed for DC filter-
ing, low reactive power.
STANDARDS
IEC 61071-1, IEC 61071-2: Power electronic capacitors
IEC 60384-16: Fixed metallized polypropylene
film dielectric DC capacitors
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
IEC 60384-2: Fixed metallized polyester
capacitors
LIFETIME EXPECTANCY
One unique feature of this technology (as opposed to elec-
trolytics) 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.
Please note that this is theoretical, however, as the capacitor
continues to be functional even after this 2% decrease.
PACKAGING MATERIAL
Self-extinguishing plastic case (V0 = in accordance with UL 94)
filled thermosetting resin.
Self-extinguishing thermosetting resin (V0 = in accordance with
UL 94; I3F2 = in accordance with NF F 16-101).
HOT SPOT CALCULATION
See Hot Spot Temperature, page 3.
θ
hot spot
= θ
ambient
+ (P
d
+ P
t
) x (R
th
+ 7.4)
θ
hot spot
= θ
case
+ (P
d
+ P
t
) x R
th
with P
d
(Dielectric losses) = Q x tgδ
0
⇒ [
1
⁄2 x C
n
x (V
peak
to
peak
)
2
x f ] x tgδ
0
tgδ
0
(tan delta)
For polypropylene, tgδ
0
= 2 x 10
-4
for frequencies
up to 1MHz and is independent of temperatures.
For polyester, tgδ
0
values are shown in graph 4
on page 3.
P
t
(Thermal losses) = R
s
x (I
rms
)
2
where C
n
in Farad I
rms
in Ampere f in Hertz
Vin Volt R
s
in Ohm θ in °C
R
th
in °C/W R
th
: R
th
case/hot spot in °C/W