CD5.121

CD-Series

DC/DC Converter 12V, 8A

Daisy chaining (jumping from one DC/DC-converter output to the next) is allowed as long as the average output

current through one terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal

block.

Fig. 21-4 Daisy chaining of outputs

Fig. 21-5 Using distribution terminals

DC/DC

Converter

+ +

- -

Input

Output

Load

+

-

max 25A!

DC/DC

Converter

+ +

- -

Input

Output

Load

+

-

Distribution

Terminals

DC/DC

Converter

+ +

- -

Input

Output

DC/DC

Converter

+ +

- -

Input

Output

DC/DC converters of the exact same type can be connected in series for higher

output voltages. It is possible to connect as many units in series as needed,

providing the sum of the output voltage does not exceed 150Vdc. Voltages with

a potential above 60Vdc are not SELV any more and can be dangerous. Such

voltages must be installed with a protection against touching. Earthing of the

output is required when the sum of the output voltage is above 60Vdc. Avoid

return voltage (e.g. from a decelerating motor or battery) which is applied to the

output terminals. Keep an installation clearance of 15mm (left / right) between

two DC/DC-converters and avoid installing the DC/DC-converters on top of each

other. Do not use DC/DC-converters in series in mounting orientations other than

the standard mounting orientation (input terminals on the bottom and output terminals on top of the unit).

Unit A

Input

Output

Unit B

-

+

-

+

+

-

Input

Output

Load

When the DC/DC-converter is installed in a tightly sealed enclosure, the temperature inside the enclosure will be

higher than outside. In such situations, the inside temperature defines the ambient temperature for the DC/DC-

converter.

The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.

The DC/DC-converter is placed in the middle of the box, no other heat producing items are inside the box

Enclosure:

Rittal Typ IP66 Box PK 9516 100, plastic, 110x180x165mm

Load:

12V, 6.4A; (=80%) load is placed outside the box

Input:

24Vdc

Temperature inside enclosure:

48.0°C (in the middle of the right side of the DC/DC converter with a distance of 2cm)

Temperature outside enclosure: 22.6°C

Temperature rise:

25.4K

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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