Datasheet

CD5.121
CD-Series
DC/DC Converter 12V, 8A
3. INPUT VOLTAGE
Input voltage nom. DC 24V
Input voltage range 18.0-32.4Vdc full specified
14.4-18.0Vdc maximal 60 seconds or with de-rating see Fig. 3-2
max. 36.0Vdc absolute maximum continuous input voltage with no
damage to the DC/DC converter
Allowed voltage between input
and earth
max. 60Vdc or
42.2Vac
in case the output voltage is not grounded.
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. 3-1
Shut-down voltage typ. 14.0Vdc steady-state value, see Fig. 3-1
typ. 35.0Vdc steady-state value, see Fig. 3-1
Input current typ. 4.6A at 24Vdc input and output 12V, 8A, see Fig. 3-4
Start-up delay typ. 420ms see Fig. 3-3
Rise time typ. 210ms 0mF, 12V, constant current load 5A, see Fig. 3-3
typ. 240ms 8mF, 12V, constant current load 5A, see Fig. 3-3
Turn-on overshoot max. 500mV see Fig. 3-3
Input capacitance typ. 3 000μF external capacitors on the input voltage bus are allowed
without any limitations.
Fig. 3-1 Input voltage range
Fig. 3-2 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. 3-3 Turn-on behavior, definitions Fig. 3-4 Input current vs. output load
Start-up
delay
Rise
Time
Overshoot
- 5%
Output
Voltage
Input
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
Oct 2009 / Rev. 1.3 DS-CD5.121-EN
All parameters are specified at 12V, 8A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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