Datasheet

CD10.482
CD-Series
DC/DC Converter 48V/48V, 5A, 240W
PRELIMINARY
4. INPUT INRUSH CURRENT
An active inrush limitation circuit (inrush limiting NTC resistor which is bypassed by a MOSFET) limits the input inrush
current after turn-on of the input voltage.
The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.
Inrush current Max. 10A
peak
Temperature independent
Typ. 7A
peak
Temperature independent
Inrush energy Max. 1A
2
s Temperature independent
Fig. 4-1 Typical input inrush current behavior at
nominal load and 25°C ambient
Input Current
Input Voltage
Output Voltage
Ipk 7A
Input: 48Vdc
Output: 48V, 5A, constant current load
Ambient: 25°C
Input current 2A / DIV
Input voltage 10V / DIV
Output voltage 10V / DIV
Time basis: 100ms / DIV
5. SOFT-START FEATURE
After the DC/DC converter is turned on, the internal output current rises slowly to its nominal value. This method
charges the output capacitors (internal and external capacitors) slowly and avoids high input currents during turn-on.
High input currents can produce a high voltage drop on the input wiring (especially with long and thin cables) which
reduces the terminal voltage on the DC/DC converter. If the terminal voltage is below the shut-down voltage, the
DC/DC converter will turn-off and will make a new start-up attempt. This effect is avoided with the integrated soft-
start function. Please note that this function increases the rise time of the output voltage by a small amount.
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.
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