2002 Oct 09
37
BCcomponents
Product specification
Metallized polypropylene filter capacitors
MKP 416 to 420
Application note and limiting conditions
These capacitors are not suitable for mains applications as across-the-line capacitors without additional protection, as
described hereunder. These mains applications are strictly regulated in safety standards and therefore electromagnetic
interference suppression capacitors conforming the standards must be used.
To select the capacitor for a certain application, the following conditions must be checked:
1. The peak voltage (Up) shall not be greater than the rated DC voltage (URdc).
2. The peak-to-peak voltage (Up-p) shall not be greater than the maximum Up-p.
3. The voltage pulse slope (dU/dt) shall not exceed the rated voltage pulse slope in an RC-circuit at rated voltage and
without ringing. If the pulse voltage is lower than the rated DC voltage, the rated voltage pulse slope may be multiplied
by URdc and divided by the applied voltage.
For all other pulses following equation must be fulfilled:
T is the pulse duration.
4. The maximum component surface temperature rise must be lower than the limits in Fig.27.
5. Since in circuits used at voltages over 280 V peak-to-peak the risk for an intrinsically active flammability after a
capacitor breakdown (short circuit) increases, it is recommended that the power to the component is limited to
100 times the values mentioned in Table 1 “Heat conductivity”.
6. When using these capacitors in the input filters or as series connected with an impedance to the mains the applicant
must guarantee that following conditions are fulfilled in any case (spikes and surge voltages from the mains or line card
supply included).
VOLTAGE CONDITIONS FOR 6 ABOVE
Example
C=0.1
µF - 250 V used for the sine voltage signal of 2 VRMS at 1 MHz superimposed on 160 V (DC).
The ambient temperature is 50
°C. The circuit is high ohmic during a capacitor breakdown.
Checking the conditions:
1. The peak voltage Up = 162.8 V is lower than 250 V (DC).
2. The peak-to-peak voltage 5.6 V is lower than
.
3. The signal is not pulsed.
4. This is a sinewave, according the curves in, the capacitor can be applied.
5. Not applicable.
6. Not applicable.
ALLOWED VOLTAGES
T amb ≤
≤≤≤ 85 °°°°C
Maximum continuous RMS voltage
URac
Maximum temporary RMS -overvoltage (
<24 hours)
1.25
× URac
Maximum peak voltage (Vo-p) (<2s)
1.6
× URdc
2
dU
dt
--------
2
0
T
∫
dt
×
×
URdc
dU
dt
--------
rated
×
<
2
2
100 V AC
()
×
×
280 Upp
–
=
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