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944U700K142ABI Datasheet(PDF) 3 Page - Cornell Dubilier Electronics |
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944U700K142ABI Datasheet(HTML) 3 Page - Cornell Dubilier Electronics |
3 / 4 page CDE Cornell Dubilier •1605 E. Rodney French Blvd.•New Bedford, MA 02740•Phone: (508)996-8561•Fax: (508)996-3830 www.cde.com Type 944U Polypropylene Film Capacitors for DC Filtering To use the Expected Lifetime curves calculate Va ⁄Vr and core temperature T. Start by estimating: Applied dc voltage Va Ripple Current I Ripple Frequency f Ambient Temperature Ta Airflow speed v Units: A=m² T, Ta & Tc=°C C=μF θ , θca & θcc =°C/W ESR=mΩ v=m/s f=kHz Va &Vr=Vdc I=A NOTE: The temperature rise in the 944U is I²(ESR) times the thermal resistance θ. The ESR is mainly the metal resistance; the metal resistance is the 10 kHz ESR. For operation below 10kHz add the dielectric resistance. It is the dielectric dissipation factor—no more than 0.0002—times the capacitive reactance, i.e., 0.0002 ⁄(2πfC). That’s equal to 31.83 ⁄(fC). 1. Start with the 10 kHz ESR from the Ratings table. If frequency is less than 10 kHz, add 31.83 ⁄(fC). 2. Compute total thermal resistance θ as the sum of core-to-case thermal resistance θcc and case-to-ambient thermal resistance θ ca. Both are in the Ratings table but θca is for still air and θcc is for 10 kHz or less. For frequency > 10 kHz multiply θcc by [1+(f –10)/100], e.g., for 75 kHz multiply θcc by 1.65. For moving air use the capacitor surface area A and airflow speed v to calculate θ ca = 1 ⁄[A(5+17.5(v+0.1)0.66)]. 3. Compute Va ⁄Vr and the core temperature T. T = Ta + I²(ESR)θ 4. Look up estimated lifetime from the Expected Lifetime curves. 5. If you want a longer expected lifetime, choose a capacitor with higher voltage rating or consider using multiple capacitors in parallel to share the ripple current. Expected Lifetime Predictions Permissible Voltage Surge Duty for 100,000 Hour Life Expectancy at 50 ºC Core Temperature Factor Duration Frequency 1.67x t≤ 100 ms 1x/day 1.50x t≤ 5 minutes 1x/day 1.30x t≤ 2.5 hours 1x/day 1.10x t≤ 9.6 hours 1x/day 1.00x balance (11.9 h) 1x/day |
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