CD5.121

CD-Series

DC/DC Converter 12V, 8A

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.

12.8ms

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

typ.

7ms

input 24Vdc, output: 12Vdc, 8A, see Fig. 6-1

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

0

2

4

6

8

12ms

18

20

22

24

28Vdc

Input Voltage

Hold-up Time

(a) 12V, 4A, typ.

(b) 12V, 4A, min.

(c) 12V, 8A, typ.

(d) 12V, 8A, min.

10

26

(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

- 5%

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. 1.5 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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