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.
Input inrush current | max. | 9 Apeak | At 40°C, cold start |
typ. | 8 Apeak | At 40°C, cold start | |
typ. | 7 Apeak | At 25°C, cold start | |
Inrush energy | max. | 1 A2s | At 40°C, cold start |
Fig.4: Typical input inrush current behavior at nominal load and 25°C ambient- Input: 48 Vdc
- Output: 24 V, 10 A, constant current load
- Ambient: 25°C
- Input current: 2 A / DIV
- Input voltage: 20 V / DIV
- Output voltage: 10 V / DIV
- Time basis:200 ms / DIV