Datasheet

CD10.482
CD-Series
DC/DC Converter 48V/48V, 5A, 240W
PRELIMINARY
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. 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 10A Resistive peak load (2x the nominal
current) for 50ms, typ.
Fig. 22-2 25A Resistive peak load (5x the nominal
current) for 5ms, typ.
10ms/DIV
Output Voltage
Output
Current
0A
10A
32V
48V
2ms/DIV
Output
Voltage
Output Current
0A
25A
13V
48V
Peak current voltage dips typ. from 48V to 32V At 10A for 50ms, resistive load
typ. from 48V to 28V At 25A for 2ms, resistive load
typ. from 48V to 13V At 25A for 5ms, resistive load
July 2018 / Rev. 0.1 DS-CD10.482-EN All values are typical figures specified at 48Vdc input voltage 48V, 5A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone [phone] Germany
22/27