Datasheet

CD10.241
CD-Series
DC/DC Converter 24V/24V, 10A, 240W
22. APPLICATION NOTES
22.1. PEAK CURRENT CAPABILITY
The unit can deliver peak currents (up to several milliseconds) which are higher than the specified short term currents.
This helps to start current demanding loads. 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.
The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The load
branches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch
circuit, the fuse or circuit breaker need a certain amount of over-current to open in a timely manner. This avoids
voltage loss in adjacent circuits.
The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of
the power supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The
following two examples show typical voltage dips:
Fig. 22-1 Peak loading with 2x the nominal current
for 50ms, typ.
Fig. 22-2 Peak loading with 4x the nominal current
for 5ms, typ.
Output
Voltage
Output
Current
24V
0A
20A
16V
10ms/DIV
2ms/DIV
Output
Voltage
Output
Current
24V
0A
40A
6V
Peak load 20A (resistive load) for 50ms
Output voltage dips from 24V to 16V.
Peak load 40A (resistive load) for 5ms
Output voltage dips from 24V to 6V.
Peak current voltage dips typ. from 24V to 16V at 20A for 50ms, resistive load
typ. from 24V to 12V at 40A for 2ms, resistive load
typ. from 24V to 6V at 40A for 5ms, resistive load
Apr. 2018 / Rev. 1.2 DS-CD10.241-EN All parameters are typical values at 24V, 10A, 24Vdc input voltage, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.
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