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PSK, PSS Series Data Sheet
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Table 2d: Input data. General Conditions: T A = 25 °C, unless T C is specified
Positive Switching Regulators
Input
PSS129
PSK1212
PSS129 1
PSK1212 1
PSS249
PSK2412
Unit
Characteristics
V i
Operating input voltage
Conditions
I o = 0 – I o nom
min
18
typ
max
144 2
min
22
typ
max
144 2
min
31
typ
max
144 2
VDC
? V io min
V i o
Min. diff. voltage V i – V o
Undervoltage lock-out
T C min – T C max
12
6
12
7
24
7
I i 0
I inr p
C x
No load input current
Peak value of inrush current
Input capacitance
I o = 0, V i min – V i max
V i nom , with option E
620
50
4.5
620
50
4.5
620
50
4.5
mA
A
μF
1
2
Output set to 15 V with the R-input.
Surges up to 156 V for 2 s are allowed (no shutdown).
Table 2e: Input data. General Conditions: T A = 25 °C, unless T C is specified
Input
PSS369
PSK3612
PSS488
PSK4812
Unit
Characteristics
Conditions
min
typ
max
min
typ
max
V i
Operating input voltage
I o = 0 – I o nom
18
144 1
22
144 1
VDC
? V io min
V i o
Min. diff. voltage V i – V o
Undervoltage lock-out
T C min – T C max
36
8
48
10
I i 0
I inr p
C x
No load input current
Peak value of inrush current
Input capacitance
I o = 0, V i min – V i max
V i nom , with option E
620
50
6
620
50
6
mA
A
μF
1
Surges up to 156 V for 2 s are allowed (no shutdown).
Input Filter and Fuse
An input filter and a fuse are incorporated in all converters as
standard. The filter reduces emitted electrical noise and
prevents oscillations caused by the negative input impedance
frequency f i has the following values:
v i max = 1000 Hz / f i ? 1 V (or 10 V pp at 100 Hz)
Inrush Current
Table 3: Input fuses
Model
Fuse type
Size
Supplier
R ext
I inr p
R i
JM085a
Vo+
PSK3E25, PSK5A20, PSK5A25
PSK1220, PSK2420, PSK3620
F 25 A
6.3 × 32 mm Littlefuse
+
V i source
C X
+
PSK5A16, PSK1216, PSK1218
PSK2416, PSK2418, PSK3620
F 20 A
Vo–
PSS5A12, PSS5A14,
PSS1212, PSK1212, PSS1214
PSS2412, PSK2412, PSS2414
PSS3612, PSK3612, PSK3616
PSK4812
PSS129, PSS249
PSS369, PSS489
F 15 A
F 10 A
Fig. 2
Equivalent input circuit
Depending on the input source and the input impedance, the
inrush current into the converter may reach a high peak value
during the switch-on. The inrush current peak value can be
determined by following calculation; see also fig. 2:
I inr p = –––––––––
characteristic of a switched mode regulator. The input fuse
protects against fatal defects; see table 3.
The maximum permissible additionally superimposed ripple
v i of the input voltage (rectifier mode) at a specified input
V i source
( R s ext + R i )
To limit the inrush current, we recommend the choice of the
active inrush current limitation circuit, option E.
BCD20029-G Rev AB, 12-Aug-2013
MELCHER
The Power Partners.
Page 5 of 20
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