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MKT18134468065R Datasheet(PDF) 8 Page - Coilcraft lnc. |
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MKT18134468065R Datasheet(HTML) 8 Page - Coilcraft lnc. |
8 / 13 page MKT 1813 Vishay Roederstein DC Film Capacitor MKT Axial Type www.vishay.com For technical questions, contact: dc-film@vishay.com Document Number: 26013 24 Revision: 08-Dec-08 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 ambient temperature. The power dissipation can be calculated according type detail specification “HQN-384-01/101: Technical Information Film Capacitors”. The component temperature rise ( ΔT) can be measured (see section “Measuring the component temperature” for more details) or calculated by ΔT = P/G: •ΔT = 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 ΔT = 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 2√2 x URac to avoid the ionisation inception level 3. The voltage peak 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 The rated voltage pulse slope is valid for ambient temperatures up to 85 °C. For higher temperatures a derating factor of 3 % per K shall be applied. 4. The maximum component surface temperature rise must be lower than the limits (see figure max. allowed component temperature rise). Thermocouple 2 dU dt -------- ⎝⎠ ⎛⎞ 2 0 T ∫ dt U Rdc dU dt -------- ⎝⎠ ⎛⎞ rated × < × × |
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