User manual

CD5.121
CD–Series
DC/DC Converter; 12V, 8A
Jan. 08 / Rev. 1.1 DS-CD5.121-EN / All parameters are specified at 12V, 8A and 24Vdc input at 25°C ambient unless otherwise noted.
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5. INPUT VOLTAGE
Input
nom. DC 24V
Input voltage range
nom. 18.0-32.4Vdc Continuous operation
14.0-18.0Vdc Max. 60 seconds or with de-rating, see Fig. 5-2
max. 36.0Vdc Absolute maximum continuous input voltage with no
damage to the DC/DC converter.
Allowed voltage between input
and earth (ground)
max. 60Vdc or
42.4Vac
Allowed input ripple voltage
max. 5Vpp 47Hz-40kHz, the momentary input voltage must always be
within the specified limits.
Turn-on voltage typ. 17.5Vdc Steady-state value, see Fig. 5-1
Shut-down voltage typ. 14.0Vdc Steady-state value, see Fig. 5-1
typ. 35Vdc Steady-state value, see Fig. 5-1
Input current
typ. 4.6A At 24Vdc input and output 12V, 8A, see Fig. 5-4
Start-up delay typ.
420ms
See Fig. 5-3
Rise time typ. 210ms 0mF, 12V, 8A constant current load, see Fig. 5-3
typ. 240ms 8mF, 12V, 8A constant current load, see Fig. 5-3
Turn-on overshoot
max.
500mV
See Fig. 5-3
Input capacitance typ.
3000µF
External capacitors on the input voltage bus are allowed without any limitations.
Fig. 5-1 Input voltage range
Fig. 5-2 Allowable output current below 18V
input voltage
Turn-on
17.5Vdc
V
IN
P
OUT
Shut-down
32.4Vdc 14.0Vdc 18.0Vdc
Rated input range
35.0Vdc
0
2
4
6
8
10A
14 16 18 20 24Vdc
Input Voltage
Output Current
22
(
a
)
(
b
)
(a) Ambient < 45°C
(b) Ambient < 60°C
Fig. 5-3 Turn-on behavior, definitions Fig. 5-4 Input current vs. output load
Start-up
delay
Rise
Time
Overshoot
- 5%
Output
Voltage
Intput
Voltage
10
A
1
23 5
7
0
2
4
6
8A
9
Output Current
4
6
8
I
n
p
u
t
:
2
4
V
d
c
Input
Current,
typ.
I
n
p
u
t
:
1
8
V
d
c