DFFHV11FW2637 datasheet(13/13 Pages) AVX

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092315

Medium Power Film Capacitors

FFHV/FTHV 1500Vdc to 3000Vdc

CALCULATION FORM

SPECIFICATION

CALCULATIONS

Capacitance

C (μF)

Working voltage

Uw (V)

Rms current

Irms (Arms)

Frequency

f (Hz)

Ripple voltage

Ur (V)

Ambient temperature

θamb (°C)

Lifetime @ Uw,Irms and

θamb

hours

Parasitic inductance

L (nH)

Capacitance

C (μF)

Rated voltage

Un (V)

Serial resistance

Rs (mΩ)

between

Rth (°C/W)

hot spot and case

Your choice

Maximum ripple voltage

Urmax = 0.2 Un

Urmax =

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

Pj = RsxIrms2

Pj =

Dielectric losses

Pd = Qxtg

δ0=Qx 2.10-4

Pd =

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

1.3

1.2

1.1

0.9

0.8

0.7

100

1,000

10,000

100,000

1,000,000

Lifetime Expectancy (hours)

θHS = 60ºC

θHS = 70ºC

θHS = 80ºC

θHS = 85ºC

Expected lifetime at hot spot calculated and U = Uw

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