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DFFHV35MX2637 Datasheet(PDF) 3 Page - AVX Corporation

Part # DFFHV35MX2637
Description  Medium Power Film Capacitors
Download  13 Pages
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Manufacturer  AVX [AVX Corporation]
Direct Link  http://www.avx.com
Logo AVX - AVX Corporation

DFFHV35MX2637 Datasheet(HTML) 3 Page - AVX Corporation

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57
092315
Medium Power Film Capacitors
FFHV/FTHV 1500Vdc to 3000Vdc
HOW TO CHOSE THE RIGHT CAPACITOR
Time
Uw
Un
Ur
1/f
The capacitor lifetime depends on the working voltage and the hot spot temperature.
Our caps are designed to meet 100000 hours lifetime at rated voltage and 70°C hot spot temperature. In accordance with
operating conditions, please calculate the hot spot temperature and deduce from this calculation if the obtained lifetime can suit
the application.
1. From the tables, select a capacitor with required capacitance
Cn and voltage Un.
Calculate the maximum ripple voltage allowed for the selected cap:
Urmax = 0.2Un
If Ur>Urmax, select a capacitor with higher rated voltage
Make sure Irms application < Irms table
Copy out:
• serial resistance (Rs): see table of values
• thermal resistances Rth1 and Rth2 (depending on cooling conditions)
2. Hot spot temperature calculation
Total losses are calculated as follow: Pt=Pj+Pd
Joule losses: Pj = Rs x Irms²
Dielectric losses: Pd = Q x tg
δ0 with
• Q(reactive power) = Irms2 for a sinusoidal waveform
–––––
C
• tg
δ0 = 2 x 10-4 (dielectric losses of polypropylene)
Hot spot temperature will be:
HS =
amb + (Pj + Pd) x (Rth1 + Rth2)
HS
absolute maximum is 85°C
If temperature is higher than 85°C, come back to #1 and start again
with another selection.
Rth1: thermal resistance between hot spot and case
Rth2: thermal resistance between case and ambient air
3. Refer to the curve and deduce the lifetime vs Uw/Un ratio
width
HS
CASE
AMB
Rth1
Rth2
eg: rated voltage 2000V
working voltage 1900V
ρ = 0.95 ⇒ lifetime 200,000 hours
@ 70°C hot spot temperature
Please, find a calculation form at the end of the catalog
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
100
1,000
10,000
100,000 200,000
0.95
1,000,000
Lifetime Expectancy (hours)
θHS = 65ºC


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