Puls CD5.241 Technical Data

CD5.241

CD-Series

DC/DC Converter 24V, 5A

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. 5 2
max. 36.0Vdc absolute maximum continuous input voltage with no

damage to the DC/DC converter

Allowed voltage between input
and earth

Allowed input ripple voltage

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. 5.5A at 24Vdc input and output 24V, 5A, see Fig. 5 4
Start-up delay typ. 650ms see Fig. 5 3
Rise time typ. 80ms 0mF, 24V, constant current load 5A, see Fig. 5 3
typ. 150ms 5mF, 24V, constant current load 5A, see Fig. 5 3
Turn-on overshoot max. 500mV see Fig. 5 3
Input capacitance typ. 3 000μF external capacitors on the input voltage bus are allowed

Fig. 3-1 Input voltage range

P

OUT

Shut-down

0Vdc

14.

Rated input range

Turn-on

0Vdc

17.5Vdc

18.

Fig. 3-3 Turn-on behavior, definitions Fig. 3-4 Input current vs. output load

Input
Voltage

Output
Voltage

- 5%

Start-up

delay

Rise

Time

max. 60Vdc or

in case the output voltage is not grounded.

42.2Vac

max. 5Vpp 47Hz-40kHz, the momentary input voltage must always

be within the specified limits.

without any limitations.

Fig. 3-2 Allowable output current below 18V

Output Current

6A

5

4

3

2

1

0

14 16 18 20 24Vdc

Input

8A

Current,
typ.

6

4

2

0

1

input voltage

Input Voltage

Output Current

2.5

1.5 2 3

(

a

)

)

(

b

(a) Ambient < 45°C
(b) Ambient < 60°C

t

u

p

n

I

p

n

I

3.5

4

4.5

22

c

d

V

8

1

:

c

Vd

4

2

:

t

u

5.5

5

6A

4Vdc

32.

V

35.0Vdc

ershoot
Ov

IN

Oct 2009 / Rev. 1.3 DS-CD5.241-EN
All parameters are specified at 24V, 5A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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CD5.241

CD-Series

DC/DC Converter 24V, 5A

4. 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. 1.6A
typ. 1.2A
Inrush energy typ. negligible -25°C to +70°C, input: 24Vdc

Fig. 4-1 Input inrush current, typical behavior

Input Current

Input Voltage

Output Voltage

-25°C to +70°C, input: 24Vdc

peak

-25°C to +70°C, input: 24Vdc

peak

Input: 24Vdc
Output: 24V, 5A, constant current load
Ambient: 25°C

Upper curve: Input current 2A / DIV
Middle curve: Input voltage 20V / DIV
Lower curve: Output voltage 20V / DIV
Time basis: 100ms / DIV

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. 4-2 Soft-start behavior

Input Current

Output Voltage

Input: 24Vdc
Output: 24V, 5A, constant current load
Ambient: 25°C
No additional external output capacitors

Upper curve: Input current 2A / DIV
Lower curve: Output voltage 10V / DIV
Time basis: 20ms / DIV

Oct 2009 / Rev. 1.3 DS-CD5.241-EN
All parameters are specified at 24V, 5A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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A

c

CD5.241

CD-Series

DC/DC Converter 24V, 5A

5. OUTPUT

Output voltage nom. 24V
Adjustment range min. 23-28V guaranteed
max. 30V at clockwise end position of potentiometer
Factory setting 24.1V ±0.2%, at full load, cold unit
Line regulation max. 25mV Input voltage variations between 18 to 32.4Vdc
Load regulation max. 100mV static value, 0A Æ 5A
Ripple and noise voltage max. 50mVpp 20Hz to 20MHz, 50Ohm
Output capacitance typ. 2 200μF
Output current nom. 6A at 24V, ambient < 45°C, see Fig. 5-1
nom. 5A at 24V, ambient < 60°C, see Fig. 5-1
nom. 5.2A at 28V, ambient < 45°C, see Fig. 5-1
nom. 4.3A at 28V, ambient < 60°C, see Fig. 5-1
Output power nom. 144W for ambient temperatures < 45°C
nom. 120W for ambient temperatures < 60°C
Short-circuit current min. 7A continuous current, short circuit impedance 200mOhm
max. 10A continuous current, short circuit impedance 200mOhm

Fig. 5-1 Output voltage vs. output current at

Output Voltage

24Vdc input voltage, typ.

28V

24

20

16

12

8

4
0

Output Current

048

Adjustment

Range

12

1062

Fig. 5-2 Current limitation vs. input voltage,

(23V constant voltage load), typ.

Output Current

6.6A

6.5

6.4

6.3

6.2

6.1

6.0

5.9

5.8
15 21 27

Input Voltage

Peak current capability (up to several milliseconds)

The DC/DC converter can deliver a peak current, which is higher than the specified short term current. This helps to
start current demanding loads or to safely operate subsequent circuit breakers.

The extra current is supplied by the output capacitors inside the DC/DC converter. During this event, the capacitors will
be discharged and causes a voltage dip on the output. Detailed curves can be found in chapter 22.1.

Peak current voltage dips typ. from 24V to 18V at 10A for 50ms, resistive load
typ. from 24V to 15V at 20A for 2ms, resistive load
typ. from 24V to 11.5V at 20A for 5ms, resistive load

302418 33Vd

Oct 2009 / Rev. 1.3 DS-CD5.241-EN
All parameters are specified at 24V, 5A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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