CD5.243

CD-Series

DC/DC Converter 24V, 4A

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 21.1.

Peak current voltage dips

typ.

from 24V to 18V

at 8A for 50ms, resistive load

typ.

from 24V to 12.5V

at 16A for 2ms, resistive load

typ.

from 24V to 10V

at 16A for 5ms, resistive load

The input side of the DC/DC converter is equipped with a bulk capacitor which keeps the output voltage alive for a

certain period of time when the input voltage dips or is removed. The bulk capacitor can be discharged by loading the

DC/DC converter on the output side or through a load which is parallel to the input. There is no protection in the

DC/DC converter which prevents current from flowing back to the input terminals. If prevention is needed, an external

diode should be used.

Hold-up Time

typ.

5.8ms

input 12Vdc, output: 24Vdc, 2A, see Fig. 6-1

typ.

3.0ms

input 12Vdc, output: 24Vdc, 4A, see Fig. 6-1

Fig. 6-1 Hold-up time vs. input voltage

0

1

2

3

4

6ms

910

11

12

14Vdc

Input Voltage

Hold-up Time

(a) 24V, 2A, typ.

(b) 24V, 2A, min.

(c) 24V, 4A, typ.

(d) 24V, 4A, min.

5

13

(a)

(b)

(c)

(d)

Fig. 6-2 Shut-down test setup

Fig. 6-3 Shut-down behavior, definitions

Load

+

-

DC/DC

Converter

DC

Source

+

-

Input

Output

+

-

CD5

S1

- 10%

Hold-up Time

Output

Voltage

Intput

Voltage

S1 opens

Note: At no load, the hold-up time can be up to several seconds. The green DC-ok lamp is also on during this time.

Mar. 2016 / Rev. 1.3 DS-CD5.243-EN

All parameters are specified at 24V, 4A, 12Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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