Datasheet

UF20.481
UF-Series
48V, 20A, 100MS, BUFFER MODULE
5. SELECTION OF THE BACK-UP THRESHOLD VOLTAGE
The buffer behavior can be selected with the back-up jumper selector between “Fixed Mode” and “Variable Mode”.
Fixed Mode: (Jumper in position „2-3“ or „45V fixed”)
If the supply output voltage falls below 45V, buffering starts and the supply voltage will be kept at this level.
This adjustment is recommended:
- when power supplies other than the DIMENSION Q-series are used
- with back-feeding loads
- when the buffer module is placed close to the load or
- whenever in doubt.
Variable Mode: (Jumper in position „1-2“ or „V
IN
– 2V”)
Buffering starts if the supply voltage decreases by more than 2V. Buffering ends when supply voltage increases by
more than 2V
Voltage changes slower than 1.1V/s will be ignored if the voltage is above 45V. Below 45V buffering starts
immediately.
This adjustment is recommended for any application where 45V is too low for the application or when the buffer
module is placed close to the power supply.
The factory setting is fixed mode, A missing jumper means also fixed mode.
6. BUFFER TIME
The buffer time (sometimes also called autonomy time) is the maximum period of time for which the capacitor can
maintain the required output current. The buffer time mainly depends on the output current in buffer mode.
To increase the buffer time any given number of buffer modules can be connected in parallel.
Buffer time Min. 100ms
At 45V, 20A
Min. 200ms
At 45V, 10A
Typ. 150ms
At 45V, 20A
Typ. 300ms
At 45V, 10A
Typ. 21s
At 45V, 0.1A
Fig. 6-1 Buffer time, typ.
Fig. 6-2 Buffer time for small buffer currents,
typ.
Buffer Current, typ.
Buffer Current, typ.
20A
6/18
0
00.3 3s
5
15
10
0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.4
0
3 18s
Buffer Time
0.25
0.75
0.5
1.0A
6912 15
Buffer Time
Oct. 2016 / Rev. 2.0 DS-UF20.481-EN
All parameters are specified at 48V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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