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BFC238370682 Datasheet(PDF) 21 Page - Vishay Siliconix

Part No. BFC238370682
Description  AC and Pulse Double Metallized Polypropylene Film Capacitors
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

BFC238370682 Datasheet(HTML) 21 Page - Vishay Siliconix

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Document Number: 28124
For technical questions, contact: dc-film@vishay.com
www.vishay.com
Revision: 19-Mar-13
207
MMKP 383
AC and Pulse Double Metallized Polypropylene
Film Capacitors MMKP Radial Potted Type
Vishay BCcomponents
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Not Recommended for New Design, Use New MMKP383
POWER DISSIPATION AND MAXIMUM COMPONENT TEMPERATURE RISE
The power dissipation must be limited in order not to exceed the maximum allowed component temperature rise as a function of
the free air ambient temperature.
The power dissipation can be calculated according type detail specification “HQN-384-01/101: Technical Information Film
Capacitors”.
The component temperature rise (
T) can be measured (see section “Measuring the component temperature” for more details)
or calculated by
T = P/G:
T = Component temperature rise (°C)
 P = Power dissipation of the component (mW)
 G = Heat conductivity of the component (mW/°C)
MEASURING THE COMPONENT TEMPERATURE
A thermocouple must be attached to the capacitor body as in:
The temperature is measured in unloaded (Tamb) and maximum loaded condition (TC).
The temperature rise is given by
T = T
C - Tamb.
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 (UP) shall not be greater than the rated DC voltage (URdc)
2. The peak-to-peak voltage (UP-P) shall not be greater than 22 x URac to avoid the ionisation inception level
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 (see graph max. allowed component
temperature rise).
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 the table: “Heat Conductivity”
Thermocouple
2
dU
dt
--------


2
0
T
dt
U
Rdc
dU
dt
--------


rated


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