CD5.241 Datasheet, PDF (5/22 Pages) PULS GmbH – DC/DC Converter

CD-Series
CD5.241
DC/DC Converter 24V, 5A
4. SOFT-START AND INPUT INRUSH CURRENT SURGE
Inrush current limitation
An active inrush limitation circuit (inrush limiting resistor which is bypassed by a relay contact) 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
Inrush energy
max.
typ.
typ.
1.6Apeak
1.2Apeak
negligible
-25°C to +70°C, input: 24Vdc
-25°C to +70°C, input: 24Vdc
-25°C to +70°C, input: 24Vdc
Fig. 4-1 Input inrush current, typical behavior
Input Current
Input Voltage
Output Voltage
Input:
Output:
Ambient:
24Vdc
24V, 5A, constant current load
25°C
Upper curve:
Middle curve:
Lower curve:
Time basis:
Input current 2A / DIV
Input voltage 20V / DIV
Output voltage 20V / DIV
100ms / DIV
Soft-start function:
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.
Fig. 4-2 Soft-start behavior
Input Current
Output Voltage
Input:
24Vdc
Output:
24V, 5A, constant current load
Ambient:
25°C
No additional external output capacitors
Upper curve:
Lower curve:
Time basis:
Input current 2A / DIV
Output voltage 10V / DIV
20ms / DIV
Mar. 2016 / Rev. 1.5 DS-CD5.241-EN
All parameters are specified at 24V, 5A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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