CD5.121

CD-Series

DC/DC Converter 12V, 8A

Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up coil. The inrush current

demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal

output current (including the PowerBoost) The same situation applies, when starting a capacitive load.

Branch circuits are often protected with circuit breakers or fuses. In case of a short or an overload in the branch circuit,

the fuse needs a certain amount of over-current to trip or to blow. The peak current capability ensures the safe

operation of subsequent circuit breakers.

Assuming the input voltage is turned on before such an event, the built-in large sized output capacitors inside the

DC/DC converter can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following

two examples show typical voltage dips:

Fig. 21-1 Peak loading with 2x the nominal

current for 50ms, typ.

Fig. 21-2 Peak loading with 5x the nominal

current for 5ms, typ.

10ms/DIV

Output

Voltage

Output

Current

12V

1A

16A

8.3V

1ms/DIV

Output

Voltage

Output

Current

12V

1A

40A

4.3V

Peak load 16A (resistive load) for 50ms

Output voltage dips from 12V to 8.3V.

Peak load 40A (resistive load) for 5ms

Output voltage dips from 12V to 4.3V.

Loads such as decelerating motors and inductors can feed voltage back to the DC/DC converter. This feature is also

called return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).

This DC/DC converter is resistant and does not show malfunctioning when a load feeds back voltage to the DC/DC

converter. It does not matter, whether the DC/DC converter is on or off.

The maximum allowed feed-back-voltage is 16Vdc. The absorbing energy can be calculated according to the built-in

large sized output capacitance which is specified in chapter 5.

The unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.

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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