DFFHV11FW2637 datasheet(5/13 Pages) AVX

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Medium Power Film Capacitors

FFHV/FTHV 1500Vdc to 3000Vdc

MEAN TIME BETWEEN FAILURE (MTBF)

MTBF = 1

/λ hours

MTBF CALCULATION

GENERAL FAILURE RATE

Based on Return Of Experience from the field of more than 30 years, we have established the following relation.

The failure rate

λB depends on hot spot temperature θHS and charge ratio ρ.

ρ = Uw/Un

(

)

(

in failures/hour

λ=λB x πQ x πB x πE failures/hour • πQ, πB and πE see following tables

Qualification

factor πQ

Product qualified on IEC61071

and internal qualification

Product qualified on IEC61071

Product answering on

another norm

Product without qualification

Environment

factor πE

On ground (good conditions)

On ground (fixed materials)

On ground (on board)

On ship

On plane

Environment

factor πB

Favorable

Unfavourable

SURVIVAL FUNCTION

N = N0 x exp (-

λt)

N is the number of pieces still working after t hours.

N0 is the number of pieces at the origin (t = 0)

FAILURE MODE

Main failure mode due to AVX’s Controlled Self-Healing Technology is only losses of capacitance. Thanks to Controlled

Self-Healing solution to interrupt self-healing process in order to prevent avalanche effect due to polypropylene molecular

cracking producing gas and potential explosion in confined box for none Controlled Self-Healing capacitors.

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