CPS20.241-60
C-Series
24V,
400W,
DC/DC
C
ONVERTER
Sep. 2019 / Rev. 1.1 DS-CPS20.241-60-EN
All parameters are specified at 24.5V, 16.3A, 110Vdc, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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8/22
9.
E
FFICIENCY AND
P
OWER
L
OSSES
Efficiency
typ.
93.7%
at 110Vdc input and 16.3A output current
Average efficiency
*)
typ.
92.3%
25% at 4.1A, 25% at 8.2A,
25% at 12.2A. 25% at 16.3A
Power losses
typ.
4.7W
at 110Vdc input and 0A output current
typ.
17.4W
at 110Vdc input and 8.2A output current
typ.
26.9W
at 110Vdc input and 16.3A output current
*) The average efficiency is an assumption for a typical application where the DC/DC converter is loaded with 25% of the nominal load for
25% of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with
100% of the nominal load for the rest of the time.
Fig. 9-1
Efficiency vs. output current, typ
Fig. 9-2
Losses vs. output current, typ.
Efficiency
2
4
6
8
12
16A
88
89
90
91
92
93
94%
Output Current
10
14
87
Power Losses
0
2
6
8
12 14 16A
10
0
15
20
30W
4
10
5
25
Output Current
10.
L
IFETIME
E
XPECTANCY AND
MTBF
Lifetime expectancy
*)
222 000h
*)
at 8.2A and 40°C
627 000h
*)
at 8.2A and 25°C
151 000h
*)
at 16.3A and 40°C
428 000h
*)
at 16.3A and 25°C
MTBF
**)
SN 29500, IEC 61709
571 000h
at 16.3A and 40°C
932 000h
at 16.3A and 25°C
MTBF
**)
MIL HDBK 217F
238 000h
at 16.3A and 40°C, Ground Benign GB40
322 000h
at 16.3A and 25°C, Ground Benign GB25
51 000h
at 16.3A and 40°C, Ground Fixed GF40
67 000h
at 16.3A and 25°C, Ground Fixed GF25
*) The
Lifetime expectancy
shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime
expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the
capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years
(131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**)
MTBF
stands for
M
ean
T
ime
B
etween
F
ailure, which is calculated according to statistical device failures, and indicates reliability of a
device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that
statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit
has been running for 50 000h or only for 100h.
