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.	9A_peak	At 40°C, cold start
	typ.	8A_peak	At 40°C, cold start
	typ.	7A_peak	At 25°C, cold start
Inrush energy	max.	1A²s	At 40°C, cold start

Input inrush current 1: — Typical input inrush current behavior at nominal load and 25°C ambient

Input: 48Vdc
Output: 24V, 10A, constant current load
Ambient: 25°C

Input current: 2A / DIV
Input voltage: 20V / DIV
Output voltage: 10V / DIV
Time basis:200ms / DIV