MKP385 Vishay, MKP385 Datasheet - Page 10

• Manufacturer Part Number: MKP385
• Description: Ac And Pulse Metallized Polypropylene Film Capacitors Mkp Radial Potted Type
• Manufacturer: Vishay

MKP 385
Vishay BCcomponents
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 (U
2. The peak-to-peak voltage (U
3. The voltage peak slope (dU/d
4. The maximum component surface temperature rise must be lower than the limits (see figure max allowed component temp rise)
5. Since in circuits used at voltages over 280 V peak-to-peak the risk for an intrinsically active flammability after a capacitor
6. When using these capacitors as across-the-line capacitor in the input filter for mains applications or as series connected with
Voltage Conditions for 6 Above
EXAMPLE
C = 4n7 1600 V used for the voltage signal shown in next figure.
U
The ambient temperature is 80 °C. In case of failure, the oscillation is blocked.
Checking the conditions:
1.
2. The peak-to-peak voltage 1000 V is lower than 2 √2 x 550 Vac = 1600 U
3. The voltage pulse slope dU/dt = 1000 V/4 µs = 250 V/µs. This is lower than 4000 V/µs (see specific reference data for each version)
4. The dissipated power is 35 mW as calculated with Fourier terms and typical tgd.
5. Oscillation is blocked
6. Not applicable
Voltage signal:
www.vishay.com
168
p-p
ALLOWED VOLTAGES
Maximum continuous RMS voltage
Maximum temporary RMS-overvoltage (< 24 h)
Maximum peak voltage (V
ringing. If the pulse voltage is lower than the rated DC voltage, the rated voltage pulse slope may be multiplied by U
divided by the applied voltage.
For all other pulses following equation must be fulfilled:
2 × ⌠⎛dU⎞
T is the pulse duration
breakdown (short circuit) increases, it is recommended that the power to the component is limited to 100 times the values
mentioned in the table: “Heat conductivity”
an impedance to the mains the applicant must guarantee that the following conditions are fulfilled in any case (spikes and
surge voltages from the mains included).
The peak voltage U
The temperature rise for w
This is lower than 10 °C temperature rise at 80 °C, acc. figure.
= 1000 V; U
⌡⎝ dt ⎠
T
0
2
× dt < U
p
= 900 V; T
Rdc
p
×
p
) shall not be greater than the rated DC voltage (U
= 900 V is lower than 1600 Vdc
o-p
⎛dU⎞
⎝ dt ⎠
) (< 2 s)
Voltage
U
1
p
rated
max.
= 12 µs; T
p-p
t
) shall not exceed the rated voltage pulse slope in an RC-circuit at rated voltage and without
= 6.0 and pitch = 10 mm will be 35 mW/9 mW/°C = 3.9 °C
) shall not be greater than the maximum (U
AC and Pulse Metallized Polypropylene Film Capacitors
T
For technical questions, contact: [e-mail]
3
2
= 64 µs; T
T
1
T
2
3
= 4 µs
U
MKP Radial Potted Type
p-p
T
1.25 x U
amb
1.6 x U
U
≤ 85 °C
Rac
Rdc
Rac
Rdc
p-p
p-p
)
) to avoid the ionisation inception level
85 °C < T
0.875 x U
0.7 x U
1.1 x U
Time
amb
Rac
Rdc
≤ 110 °C
Rac
Document Number: 28152
110 °C < T
0.625 x U
Revision: 13-Oct-08
0.5 x U
0.8 x U
amb
Rac
Rdc
≤ 125 °C
Rac
Rdc
and