947C271K122CCM Cornell Dubilier Electronics (CDE), 947C271K122CCM Datasheet - Page 6

• Manufacturer Part Number: 947C271K122CCM
• Description: CAP FILM 270UF 1200V POST TERM
• Manufacturer: Cornell Dubilier Electronics (CDE)
• Series: 947Cr

Specifications of 947C271K122CCM

• Capacitance: 270µF
• Voltage - Dc: 1200V (1.2kV)
• Dielectric Material: Polypropylene, Metallized
• Tolerance: ±10%
• Esr (equivalent Series Resistance): 2.9 mOhm
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Chassis Mount
• Package / Case: Radial, Can - Screw Terminals
• Size / Dimension: 3.543" Dia (90.00mm)
• Height: 5.709" (145.00mm)
• Termination: Screw Terminals
• Lead Spacing: 1.772" (45.00mm)
• Features: General Purpose
• Capacitor Application: DC Link
• Capacitor Dielectric Type: Polypropylene
• Capacitance Tolerance: ± 10%
• Voltage Rating: 1200VDC
• Capacitor Case Style: CAN
• Capacitor Mounting: Panel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Ac: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Type 947C Polypropylene, DC Link Capacitors
High Current, High Capacitance for Inverter Applications
To use the Expected Lifetime curves calculate Va ⁄Vr and core
temperature T. Start by estimating:
Units:
NOTE: The temperature rise in the 947C is I²(ESR) times the
thermal resistance θ. The ESR is mainly the metal resistance;
the metal resistance is the 10 kHz ESR. For operation below 10
kHz add the dielectric resistance. It is the dielectric dissipation
factor—no more than 0.0002—times the capacitive reactance,
i.e., 0.0002 ⁄(2πfC). That’s equal to 31.83 ⁄(fC).
Expected Lifetime Predictions
CDE Cornell Dubilier • 1605 E. Rodney French Blvd. • New Bedford, MA 02744 • Phone: [phone] • Fax: [phone]
Applied dc voltage Va
Ripple Current I
Ripple Frequency f
Ambient Temperature Ta
Airflow speed v
A=m²
C=µF
ESR=mW
f=kHz
I=A
1.7
1.6
1.5
1.4
1.3
1.2
1.1
0.9
0.8
As an illustration at 50 °C the expected lifetime is 100,000 h with the 24-hour Va ∕ Vr.
Expected lifetime can be calculated for varying exposure to overvoltage transients.
Expected Lifetime vs Core Temperature and Applied DC Voltage
1
The expected lifetime predictions assume no exposure to overvoltage transients.
100
T, Ta & Tc=°C
θ, θca & θcc =°C/W
v=m/s
Va &Vr=Vdc
For applications with more severe 24-hour profiles, contact us.
COPY & PASTE A CDE PART NUMBER TO CHECK STOCK ONLINE:
1000
Va / Vr
1.67
1.50
1.30
1.10
1.00
Expected Lifetime (h)
10000
1. Start with the 10 kHz ESR from the Ratings table. If frequency is
less than 10 kHz, add 31.83 ⁄(fC).
2. Compute total thermal resistance θ as the sum of core-to-case
thermal resistance θcc and case-to-ambient thermal resistance
θca.
θcc is for 10 kHz or less. For frequency > 10 kHz multiply θcc
by
For moving air use the capacitor surface area A and airflow speed
v to calculate θca = 1 ⁄[A(5+17(v+0.1)
3. Compute Va ⁄Vr and the core temperature T.
4. Look up estimated lifetime from the Expected Lifetime curves.
5. If you want a longer expected lifetime, choose a capacitor with
higher voltage rating or consider using multiple capacitors in
parallel to share the ripple current.
85ºC
70ºC
50ºC
60ºC
Duration
T = Ta + I²(ESR)θ
100 ms
11.9 h
Both are in the Ratings table but θca is for still air and
9.6 h
2.5 h
5 m
[1+(f –10)/100], e.g., for 75 kHz multiply θcc by 1.65.
100000
0.66
1000000
)].
GO