MKP1840M Vishay, MKP1840M Datasheet - Page 9

• Manufacturer Part Number: MKP1840M
• Description: Ac And Pulse Metallized Polypropylene Film Capacitors Mkp Radial Potted Type
• Manufacturer: Vishay

MEASURING THE COMPONENT TEMPERATURE
A thermocouple must be attached to the capacitor body as in:
The temperature is measured in unloaded (T
The temperature rise is given by ΔT = T
To avoid radiation or convection, the capacitor should be tested in a wind-free box.
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/dt) shall not exceed the rated voltage pulse slope in an RC-circuit at rated voltage and without
4. The maximum component surface temperature rise must be lower than the limits (see graph max. allowed component
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
Document Number: 26018
Revision: 22-Jan-09
ALLOWED VOLTAGES
Maximum continuous RMS voltage
Maximum temperature 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:
T is the pulse duration
temperature rise).
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).
2
×
T
∫
0
⎛
⎝
dU
------- -
dt
⎞
⎠
2
×
dt U
AC and Pulse Metallized Polypropylene Film Capacitors
<
Rdc
P
) shall not be greater than the rated DC voltage (U
O-P
×
) (< 2 s)
⎛
⎝
dU
------- -
dt
⎞
⎠
P-P
rated
) shall not be greater than the maximum (U
c
MKP Radial Potted Type
- T
For technical questions, contact: [e-mail]
amb
amb
.
) and maximum loaded condition (T
T
1.25 x U
amb
1.6 x U
U
≤ 85 °C
Rac
Rdc
Thermocouple
Rdc
Rac
p-p
)
) to avoid the ionisation inception level
C
).
Vishay Roederstein
85 °C < T
MKP 1840 M
1.25 x U
1.1 x U
U
amb
Rac
Rdc
≤ 100 °C
Rac
www.vishay.com
Rdc
and
155