X5R Dielectric LD Series Tin/Lead Terminations - AVX

Medium Power Film Capacitors
FSB (RoHS Compliant)
STANDARDS
IEC 61071-1, IEC 61071-2: Power electronic capacitors
TANGENT OF LOSS ANGLE (TANδ 0 ) FOR
POLYPROPYLENE DIELECTRIC
Polypropylene has a constant dielectric loss factor of 2x10 -4
irrespective of temperature and frequency (up to 1 MHz).
IGBT SNUBBER
With
U0
I
U
T = 1/fr
L = stray inductance IGBT + capacitor
R = serial resistance IGBT + capacitor
t
t
HOT SPOT TEMPERATURE CALCULATION
See Hot Spot Temperature, page 3.
θ hot spot = θ ambient + (P d + P t ) x R th
with 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 ) 2
Rth : Rth ambient / hot spot in °C/W
where C n in Farad I rms in Ampere f in Hertz
V in Volt R s in Ohm θ in °C
Due to the design of the capacitor and its technology, the thermal
impedance between the terminations and the core
of the capacitor is low, it is necessary to take care that
the 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 thermal
exchanges, we recommend that thermal measurements shall
be made on the different components. We would be pleased
to advise you on specific applications.
WORKING TEMPERATURE
(according to the power to be dissipated) -40°C to +85°C
MARKING
TPC logo
Capacitance and tolerance in clear
Nominal DC voltage in clear
RMS current in clear
Date of manufacture (IEC coding)
Ieff = C b 2 U 0
2
with
0 1 e–2T
+
a 2
2j b
1
T [ b sin(2 b T) – a cos(2 b T)]+ 1 1
e –2T + a –
a b 2 +
a 2 a
b 0 = ; ;
b = b
0
LC a =
2L
b 2
R
2
– a 2
www.avx.com | 187