Hold-up time

The input side of the DC/DC converter is equipped with a capacitor that maintains the output voltage for a certain time when the input voltage drops or is removed.
The capacitor can be discharged by loading the DC/DC converter on the output side or by a load in parallel with the input.

Notice 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.

Without a load, the hold-up time can be up to several seconds.
The green DC-OK LED also lights up during this time.

Hold-up time

Typ.

8 ms

At 24 Vdc input voltage, 24 V, 5 A output,
see Fig. Hold-up time vs. input voltage

Min.

6.5 ms

At 24 Vdc input voltage, 24 V, 5 A output,
see Fig. Hold-up time vs. input voltage

Typ.

4 ms

At 24 Vdc input voltage, 24 V, 10 A output,
see Fig. Hold-up time vs. input voltage

Min.

3.2 ms

At 24 Vdc input voltage, 24 V, 10 A output,
see Fig. Hold-up time vs. input voltage

Hold-up time 1:
Fig.6: Hold-up time vs. input voltage
Hold-up time 2:
Fig.7: Shut-down test setup; Shut-down behavior, definitions