CV Capability Guide - AVX

Medium Power Film CapacitorsFSB (RoHS Compliant)STANDARDSIEC 61071-1, IEC 61071-2: Power electronic capacitorsTANGENT OF LOSS ANGLE (TANδ 0 ) FORPOLYPROPYLENE DIELECTRICPolypropylene has a constant dielectric loss factor of 2x10 -4irrespective of temperature and frequency (up to 1 MHz).IGBT SNUBBERWithU0IUT = 1/frL = stray inductance IGBT + capacitorR = serial resistance IGBT + capacitorttHOT SPOT TEMPERATURE CALCULATIONSee Hot Spot Temperature, page 3.θ hot spot = θ ambient + (P d + P t ) x R thwith P d (Dielectric losses) = Q x tgδ 0⇒ [ 1 ⁄2 x C n x (V ripple peak to peak ) 2 x f ] x (2 x 10 -4 )P t (Thermal losses) = R s x (I rms ) 2Rth : Rth ambient / hot spot in °C/Wwhere C n in Farad I rms in Ampere f in HertzV in Volt R s in Ohm θ in °CDue to the design of the capacitor and its technology, the thermalimpedance between the terminations and the coreof the capacitor is low, it is necessary to take care thatthe capacitor is never overheated by use of wrongly sized connections.Do not use the capacitor as a heat sink.Due to the complexity of the IGBT / capacitor thermalexchanges, we recommend that thermal measurements shallbe made on the different components. We would be pleasedto advise you on specific applications.WORKING TEMPERATURE(according to the power to be dissipated) -40°C to +85°CMARKINGTPC logoCapacitance and tolerance in clearNominal DC voltage in clearRMS current in clearDate of manufacture (IEC coding)Ieff = C b 2 U 02with0 1 e–2T +a 22j b1T [ b sin(2 b T) – a cos(2 b T)]+ 1 1e –2T + a –a b 2 +a 2 a b 0 = ; ;b = b0LC a =2Lb 2R2– a 2www.avx.com | 185