E2S Series – Eighth-Brick DC/DC Converter
48V Input
Data Sheet
5.0V, 3.3V, 2.5V, 2.0V, 1.8V, 1.5V, 1.2V Output
REV. MAR 11, 2003
Page 7 of 10
Thermal Considerations
The E2S15 series converters are designed for
natural or forced convection cooling.
The
maximum
allowable
output
power
of
the
converters is determined by meeting the derating
criteria of all electronic components used in the
power supplies.
An example of the derating
criteria for the semiconductor junction tem-
perature is not to exceed 120C to provide reliable
long-term operation of the converters.
The graphs in figures. 11-18 show the maximum
output current of the E2S15 series converters at
different ambient temperatures under both natural
and forced (airflow direction from pin1 to pin3)
convection.
Ambient Temperature [°C]
20
30
40
50
60
70
80
90
Lo
ad
Current
[A
d
c
]
0
2
4
6
8
10
12
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Figure 11. E2S10ZG (5.0V) Derating Curves
Ambient Temperature [°C]
20
30
40
50
60
70
80
90
Lo
ad
C
u
rr
en
t
[A
dc
]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Figure 12. E2S15ZE (3.3V) Derating Curves
Ambient Temperature [°C]
20
30
40
50
60
70
80
90
Lo
ad
Cu
rr
en
t
[
A
d
c]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Figure 13. E2S15ZD (2.5V) Derating Curves
Ambient Temperature [°C]
20
30
40
50
60
70
80
90
Lo
ad
Cu
rr
en
t
[
A
d
c]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Figure 14. E2S15ZC (2.0V) Derating Curves
Ambient Temperature [°C]
20
30
40
50
60
70
80
90
Loa
d
Cur
re
n
t
[A
dc
]
0
5
10
15
20
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Figure 15. E2S15ZB (1.8V) Derating Curves