DFFHV11MR2637 Datasheet, PDF (5/13 Pages) AVX Corporation – Medium Power Film Capacitors

Medium Power Film Capacitors
FFHV/FTHV 1500Vdc to 3000Vdc
MTBF CALCULATION
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
GENERAL FAILURE RATE
λ=λB x πQ x πB x πE failures/hour • πQ, πB and πE see following tables
Qualification
Product qualified on IEC61071
and internal qualification
Product qualified on IEC61071
Product answering on
another norm
Product without qualification
Qualification
factor πQ
1
2
5
15
Environment
On ground (good conditions)
On ground (fixed materials)
On ground (on board)
On ship
On plane
Environment
factor πE
1
2
4
9
15
Environment
Favorable
Unfavourable
Environment
factor πB
1
5
MEAN TIME BETWEEN FAILURE (MTBF)
MTBF = 1/λ hours
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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