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FFLC16FD4427 Datasheet(PDF) 2 Page - AVX Corporation

Part # FFLC16FD4427
Description  Medium Power Film Capacitors
Download  9 Pages
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Manufacturer  AVX [AVX Corporation]
Direct Link  http://www.avx.com
Logo AVX - AVX Corporation

FFLC16FD4427 Datasheet(HTML) 2 Page - AVX Corporation

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JUNE 2015
43
Medium Power Film Capacitors
FFLC
LIFETIME EXPECTANCY VS HOT SPOT TEMPERATURE AND VOLTAGE
1.4
1.3
1.2
1.1
1.0
0.9
0.8
100
1,000
10,000
100,000
1,000,000
Lifetime Expectancy (hours)
θHS = 70ºC
θHS = 85ºC
θHS = 55ºC
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
width
HS
CASE
AMB
Rth1
Rth2


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