Hold-up time

The input side of the DC/DC converter is equipped with a bulk capacitor which keeps the output voltage alive for a certain period of time when the input voltage dips or is removed. The bulk capacitor can be discharged by loading the DC/DC converter on the output side or through a load which is parallel to the input. There is no protection in the DC/DC converter which prevents current from flowing back to the input terminals. If prevention is needed, an external diode should be used.

At no load, the hold-up time can be up to several seconds. The green DC-OK LED is also on during this time.

Hold-up time	typ.	14 ms	At 48 Vdc input voltage, 24 V, 5 A output, see Fig. Hold‑up time vs. input voltage
	min.	11 ms	At 48 Vdc input voltage, 24 V, 5 A output, see Fig. Hold‑up time vs. input voltage
	typ.	7 ms	At 48 Vdc input voltage, 24 V, 10 A output, see Fig. Hold‑up time vs. input voltage
	min.	5 ms	At 48 Vdc input voltage, 24 V, 10 A output, see Fig. Hold‑up time vs. input voltage