57

092315

Medium Power Film Capacitors

FFHV/FTHV 1500Vdc to 3000Vdc

HOW TO CHOSE THE RIGHT CAPACITOR

Time

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

Calculate the maximum ripple voltage allowed for the selected cap:

Copy out:

2. Hot spot temperature calculation

δ0 with

–––––

C

• tg

Hot spot temperature will be:

HS

absolute maximum is 85°C

If temperature is higher than 85°C, come back to #1 and start again

with another selection.

width

HS

CASE

AMB

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

0.95

1,000,000

Lifetime Expectancy (hours)