Electrical Input Data
General conditions:
– T
A
= 25 C, unless
T
C
is specified.
– Shut down pin left open circuit (not connected).
– Trim input not connected.
Table 2: Input Data
Input
Characteristics
Conditions
min
32
48
100
0.25
0.5
0.1
5
ms
40
mA
uF
0.7
5
1
2
mA
A
kHz
60
B
mA
pp
V DC
s
48 IMS
typ
max
75
Unit
V DC
U
i
U
i nom
U
i sur
t
start up
t
rise
I
i NL
C
i
U
SD
Input voltage range
1
Nominal input voltage
Repetitive input surge
voltage
Converter
Switch on
start-up time
SD high
Rise time
No load input current
Input capacitance
Shut down voltage
T
C min
...T
C max
I
o
= 0...I
o nom
max 3 s
U
i min
,
I
o
=
I
o nom 2
I
o
= 0,
U
i min
...U
i max
SD high
for surge calculation
Unit disabled
Unit operating
–10
1.5
30
1.5
I
SD
I
inr p
f
s
I
i rr
u
i RFI
1
Input current of SD input
Inrush peak current
4
Switching frequency
Reflected
ripple current
Input RFI level conducted
U
i
=
U
i nom
U
i min
,
I
o nom
I
o
= 0...I
o nom
EN 55022
3
1.5
approx. 250
2
3
4
U
i min
will not be as stated if
U
o
is increased above
U
o nom
by use of the Trim input. If the output voltage is set to a higher value,
U
i min
will be proportionally increased.
Measured with a resistive and the max. admissible capacitive load.
Measured with a lead length of 0.1 m, leads twisted.
Source impedance according to prETS 300132-2, version 4.3.
Inrush Current
The inrush current has been kept as low as possible by
choosing a very small input capacitance.
A series resistor may be installed in the input line to further
limit this current.
I
[A]
1.4
1.2
1
0.8
0.6
0.4
0.2
0
–2
–1
0
1
2
3
4
5
6
7
04058
Input Undervoltage Lock-out
The IMS30 converters are fitted with a defined input under-
voltage lock-out:
turn off
turn on
(approx. values)
U
o
U
o nom
48 IMS 30
31.5 V
32 V
04008
t
rise
t
t
start up
t
[ms]
8
Fig. 3
Converter start-up and rise time (applying U
i nom
).
Fig. 2
Typical inrush current at U
i nom
, P
o nom
versus time
(48 IMS30-0503-9G). Source impedance according to
prETS 300132-2, version 4.3 at U
i nom
.
3/11
POWER-ONE [ POWER-ONE ]
