Medium Power Film Capacitors
FFB
The FFB series uses a non-impregnated 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 100°C.
The FFB has been designed for printed circuit board mount-
ing. Furthermore, their performances allow to be a very inter-
esting alternative to electrolytic technology because they
can withstand much higher levels of surge voltage.
DC FILTERING
APPLICATIONS
The FFB capacitor is particularly designed for DC filtering,
low reactive power.
GENERAL CHARACTERISTICS
Climatic category
55/100/56 (IEC 68)
Test voltage between terminals @ 25°C
1.5 x V
n
dc
STANDARDS
IEC 1071-1, IEC 1071-2: Power electronic capacitors
IEC 60 384-16: Fixed metallized polypropylene
film dielectric DC capacitors
IEC 60 384-16-1: Fixed metallized polypropylene
film dielectric DC capacitors
Assessment level E
IEC 60 384-17: Fixed metallized polypropylene
film dielectric AC and pulse
capacitors
IEC 60 384-17-1: Fixed metallized polypropylene
film dielectric AC and pulse
capacitors
Assessment level E
HOT SPOT TEMPERATURE CALCULATION
You can calculate the maximum operating (hot spot) temper-
ature of this capacitor in the following manner:
The loss factor of the capacitor is made up of the sum of two
components. The first represents electrical losses in the
dielectric and the second component represents Joule effect
in the connection and foils (Rs.C.2
π
f).
For all applications, the temperature in the hot spot capaci-
tor must be lower than 100°C.
θ
hot spot
=
θ
ambient
+
[
tgδ
0
.Q+R
s
.(I
rms
)
2
]
.R
th
With:
Q : Reactive power in Var
R
S
in Ohm
I
rms
in Ampere
R
th
: Rth ambient / hot spot in °C/W
tg
δ
0
.(10
-4
) is the tangent of loss angle
(see tan
δ
0
page 3)
WORKING TEMPERATURE
(according to the power to be dissipated) -55°C to +100°C
LIFETIME EXPECTANCY
One unique feature of this technology (as opposed to elec-
trolytics) is how the capacitor reacts at the end of its lifetime.
Whereas, with an electrolytic, there is a strong risk of explo-
sion of the case. However, with our line of film capacitors, the
capacitor will simply experience at the end of life a loss of
capacitance of about 5%, with no risk of explosion.
Please note that this is theoretical, however, as the capacitor
continues to be functional even after this 5% decrease.
PACKAGING
Self-extinguishing plastic case (V0 = in accordance with UL 94)
filled thermosetting resin.
Self-extinguishing thermosetting resin (V0 = in accordance with
UL 94; M2F1 = in accordance with NF F 16-101).
4
Medium Power Film Capacitors
FFB
DC FILTERING FOR INDUSTRIAL APPLICATION
These capacitors have been designed principally for high and medium power DC filtering applications.
DC FILTERING
ELECTRICAL CHARACTERISTICS
Capacitance range C
n
Tolerance on C
n
Rated DC voltage V
n
dc
Dielectric
1.5µF to 13µF
±10%
525 to 1100 V
polypropylene
TANGENT OF LOSS ANGLE (TANδ
0
)
FOR POLYPROPYLENE DIELECTRIC
Polypropylene has a constant dielectric loss factor of 2x10
-4
irrespective of temperature and frequency (up to 1 MHz).
For all applications, the temperature in the hot spot capaci-
tor must be lower than 100°C. Heating calculation of hot
spot capacitor:
θ
hot spot
=
θ
ambient
+
[
tgδ
0
.Q+R
s
.(I
rms
)
2
]
.R
th
With:
Q : Reactive power in Var
R
S
in Ohm
I
rms
in Ampere
R
th
: Rth ambient / hot spot in °C/W
tg
δ
0
.(10
-4
) is the tangent of loss angle for polypropy-
lene dielectric. Polypropylene has a constant dielectric
losses factor of 2x10
-4
irrespective of temperature and
frequency (up to 1 MHz).
HOT SPOT TEMPERATURE CALCULATION
You can calculate the maximum operating (hot spot) temper-
ature of this capacitor in the following manner:
The loss factor of the capacitor is made up of the sum of
two components. The first represents electrical losses
(tg
δ
0
= 2x10
-4)
and the second component represents Joule
effect in the connection and foils, (Rs.C.2
π
f).
8
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