DFFHV11MR2637 Datasheet, PDF (13/13 Pages) AVX Corporation – Medium Power Film Capacitors

Medium Power Film Capacitors
FFHV/FTHV 1500Vdc to 3000Vdc
CALCULATION FORM
SPECIFICATION
Capacitance
Working voltage
Rms current
Frequency
Ripple voltage
Ambient temperature
Lifetime @ Uw,Irms and θamb
Parasitic inductance
C (μF)
Uw (V)
Irms (Arms)
f (Hz)
Ur (V)
θamb (°C)
hours
L (nH)
Your choice
PN
Capacitance
Rated voltage
Serial resistance
between
hot spot and case
C (μF)
Un (V)
Rs (mΩ)
R_th (°C/W)
CALCULATIONS
Maximum ripple voltage
U_rmax = 0.2 U_n
U_rmax =
V
The maximum ripple voltage of the selected capacitor must be in any case higher than the ripple voltage of your application
Ratio Uw/Un
ρ = Uw/Un
ρ=
Joule losses
P_j = R_sxI_rms²
P_j =
W
Dielectric losses
Pd = Qxtgδ0=Qx 2.10^-4
Pd =
W
Hot spot temperature
θHS = θamb+(Pj+Pd)xRth
θHS =
°C
The hot spot temperature must be in any case lower than 85°C
LIFETIME EXPECTANCY VS HOT SPOT TEMPERATURE AND VOLTAGE
1.5
1.4
θ_HS = 60ºC
1.3
θ_HS = 70ºC
1.2
θ_HS = 80ºC
1.1
θ_HS = 85ºC
1
0.9
0.8
0.7
100
1,000
10,000
100,000
Lifetime Expectancy (hours)
1,000,000
Expected lifetime at hot spot calculated and U = U_w
092315
67