Datasheet

UF20.481
UF-Series
48V, 20A, 100MS, BUFFER MODULE
4. ELECTRICAL RATINGS
Supply voltage Nom. DC 48V
-20%/+25%
Supply voltage range
1)
Nom. 38.4 - 60Vdc
Normal operating voltage range
2)
Typ. 46 – 60Vdc
Transfer voltage for switching
into buffer mode
Typ.
Typ.
45Vdc
V
IN
– 2V
Back-up threshold jumper set to “45V fixed”
Back-up threshold jumper set to “V
IN
– 2V”
See also chapter 5.
Transfer voltage for switching
from buffer mode into power
supply mode
Typ.
Typ.
45Vdc
V
BUFFER
+ 2V
Back-up threshold jumper set to “45V fixed”
Back-up threshold jumper set to “V
IN
– 2V”
See also chapter 5.
Buffer voltage Typ. Same as the transfer voltage for switching into buffer mode.
Ripple and noise voltage
- in buffer mode Max.
Max.
Max.
250mVpp
400mVpp
600mVpp
At 5A generated by the buffer module
At 10A generated by the buffer module
At 20A generated by the buffer module
Defined at 20Hz to 20MHz, 50Ohm
- in power supply mode The ripple and noise voltage is defined by the power supply.
Current consumption Typ.
Min.
Max.
40mA
300mA
500mA
When capacitor is fully charged
During charging of the capacitors
During charging of the capacitors
Power dissipation Typ. 1.9W When capacitor is fully charged
Buffer current Min. 20A
Buffer current overload behavior Electronically limited, buffering stops and capacitor gets discharged
below 34V. See Fig. 4-2.
Allowed voltage between supply
voltage and chassis ground
Max. 60Vdc or
42.4Vac
Continuous, IEC 62477-1
Capacitive and inductive loads No limitation
1) Supply Voltage Range:
At voltages within the input voltage range, control functions such as LEDs, monitoring features, relay contacts, etc. are functioning
normally. Within the input voltage range the unit can either be in power supply mode or in buffer mode.
2) Normal Operating Voltage Range:
The normal operating voltage range describes the supply voltage, which supports the full functionality of the buffer module (including
charging) but without entering the buffer mode.
Fig. 4-1 Selection of an appropriate power supply
Fig. 4-2 Output characteristic in buffer mode,
45V fixed mode, typ.
Buffer Voltage
0
8
16
24
56V
32
40
020
5/18
Internal
current
consumption
consumption
for charging
Current
Load
Current
Power
Supply
Current
124 8 16 32A24 28
Output Current
48 45V
Buffering stops
below 34V
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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