Puls CD5.242 Technical Data
CD–Series
DC/DC Converter; 24V, 5A
CD5.242
5. INPUT VOLTAGE
Input
Input voltage range
typ. 30.5-36.0Vdc Max. 60 seconds or with de-rating, see Fig. 5-2
Allowed voltage between input
and earth (ground)
Allowed input ripple voltage
Turn-on voltage typ. 34.5Vdc Steady-state value, see Fig. 5-1
Shut-down voltage typ. 30.5Vdc Steady-state value, see Fig. 5-1
Input current
Start-up delay typ.
Rise time typ. 80ms 0mF, 24V, 5A, constant current load, see Fig. 5-3
Turn-on overshoot
Input capacitance typ.
External capacitors on the input voltage bus are allowed without any limitations.
Fig. 5-1 Input voltage range
P
OUT
Shut-down
30.5Vdc
Rated input range
Turn-on
35.0Vdc
36.0Vdc
Fig. 5-3 Turn-on behavior, definitions Fig. 5-4 Input current vs. output load
Intput
Voltage
Output
Voltage
- 5%
Start-up
delay
Rise
Time
nom. DC 48V
nom. 36.0-60.0Vdc Continuous operation
max. 63.0Vdc Absolute maximum continuous input voltage with no
damage to the DC/DC converter. Please note that the unit
can switch off above 60Vdc
max. 60Vdc or
42.4Vac
max. 5Vpp 47Hz-40kHz, the momentary input voltage must always be
within the specified limits.
typ. 63.5Vdc Steady-state value, see Fig. 5-1
typ. 2.75A At 48Vdc input and output 24V, 5A, see Fig. 5-4
670ms
0mF, 24V, 5A, constant current load, see Fig. 5-3
typ. 150ms 5mF, 24V, 5A, constant current load, see Fig. 5-3
60.0Vdc
500mV
800µF
V
IN
63.5Vdc
Overshoot
See Fig. 5-3
Fig. 5-2 Allowable output current below 36V
Output Current
6A
5
4
3
2
1
0
30 32 34 36 40Vdc
Input
4A
Current,
typ.
3
2
1
0
1
1.5 2 3
input voltage
(a) Ambient < 45°C
(b) Ambient < 60°C
Input Voltage
Output Current
3.5
2.5
u
p
n
I
n
I
4
t
p
4.5
)
a
(
)
b
(
38
c
d
V
6
3
:
V
8
4
:
t
u
5
d
5.5
c
6A
max.
July 08 / Rev. 1.2 DS-CD5.242-EN / All parameters are specified at 24V, 5A and 48Vdc input at 25°C ambient unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
3/21
CD–Series
DC/DC Converter; 24V, 5A
CD5.242
6. SOFT-START AND INPUT INRUSH CURRENT SURGE
Inrush current limitation
An active inrush limitation circuit (inrush limiting resistor which is bypassed by a relay contact) limits the input inrush
current after turn-on of the input voltage.
The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.
Inrush current
max. 0.8A
typ. 0.6A
Inrush energy
typ. negligible -25°C to +70°C
Fig. 6-1 Input inrush current, typical behavior
Input Current
Input Voltage
Input 48Vdc
-25°C to +70°C
peak
-25°C to +70°C
peak
Input: 48Vdc
Output: 24Vdc, 5A, constant current load
Ambient: 25°C
Upper curve: Input current 1A / DIV
Middle curve: Input voltage 50V / DIV
Lower curve: Output voltage 20V / DIV
Time scale: 100ms / DIV
Output Voltage
Soft-start function:
After the DC/DC converter is turned on, the internal output current rises slowly to its nominal value. This method
charges the output capacitors (internal and external capacitors) slowly and avoids high input currents during turn-on.
High input currents can produce a high voltage drop on the input wiring (especially with long and thin cables) which
reduces the terminal voltage on the DC/DC converter. If the terminal voltage is below the shut-down voltage, the
DC/DC converter will turn-off and will make a new start-up attempt. This effect is avoided with the integrated softstart function. Please note, that this function increases the rise time of the output voltage by a small amount.
Fig. 6-2 Soft-start behavior
Input: 48Vdc
Output: 24Vdc, 5A, constant current load
Ambient: 25°C
No additional external capacitors
Input Current
Upper curve: Input current 2A / DIV
Lower curve: Output voltage 10V / DIV
Time scale: 20ms / DIV
Output Voltage
July 08 / Rev. 1.2 DS-CD5.242-EN / All parameters are specified at 24V, 5A and 48Vdc input at 25°C ambient unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
4/21
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