®
PSS, PSK Series Data Sheet
Positive Switching Regulators
111
4.4"
3U
60
2.4"
12 TE
168
6.6"
111
4.4"
3U
80
3.2"
16 TE
168
6.6"
Description
The PSS/PSK Series of positive switching regulators is
designed as power supplies for electronic systems, where no
input-to-output isolation is required. Their major advantages
include a high level of efficiency, high reliability, low output
ripple, and excellent dynamic response. Models with input
voltages up to 144 V are specially designed for secondary
switched and battery-driven mobile applications. The
converters are suitable for railway applications according to
EN 50155 and EN 50121.
Two type of housings are available allowing operation up to
71 °C. They are designed for insertion into a 19" DIN-rack or
for chassis mounting. Replacing the heat sink by an optional
cooling plate, allows chassis or wall mounting on top of a metal
surface, acting as heat sink.
Various options are available to adapt the converter to different
applications. Connector type: H15 or H15S4, depending on
output current.
Features
•
Input voltage up to 144 VDC
•
Single output of 3.3 to 48 VDC
•
No input-to-output isolation
•
High efficiency up to 97%
•
Extremely wide input voltage range
• Low input-to-output differential voltage
•
Very good dynamic properties
•
Input undervoltage lockout
•
Active current sharing for parallel operation
• Output voltage adjustment, inhibit, and sense lines
•
Continuously no-load and short-circuit proof
•
All boards are coated with a protective lacquer
Table of Contents
Page
Page
Immunity to Environmental Conditions ............................... 13
Mechanical Data ................................................................. 14
Safety and Installation Instructions ..................................... 16
Description of Options ........................................................ 17
Accessories ......................................................................... 19
EC Declaration of Conformity ............................................. 20
Description ............................................................................ 1
Model Selection .................................................................... 2
Functional Description .......................................................... 3
Electrical Input Data .............................................................. 4
Electrical Output Data ........................................................... 6
Auxiliary Functions .............................................................. 10
Electromagnetic Compatibility (EMC) ................................. 12
BCD20029-G Rev AA, 28-Apr-09
Page 1 of 20
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®
PSS, PSK Series Data Sheet
Positive Switching Regulators
Model Selection
Table 1: All models
Output
voltage
V
o nom
[V]
3.3
5.1
5.1
5.1
5.1
5.1
5.1
12
12
12
12
12
12
12
15
3
15
3
15
3
15
3
15
3
15
3
15
3
24
24
24
24
24
24
24
36
36
36
36
36
48
48
1
2
3
4
Output
current
I
o nom
[A]
25
12
14
16
18
20
25
9
12
12
14
16
18
20
9
12
12
14
16
18
20
9
12
12
14
16
18
20
9
12
12
16
20
9
12
Operating input Nom. input
voltage range
voltage
V
i
[V]
V
i nom
[V]
8 – 40
8–
8–
8–
8–
8–
8–
80
40
80
40
80
40
20
40
20
40
20
40
20
60
40
60
30
40
30
40
60
40
60
30
40
30
40
60
50
60
40
50
40
50
80
60
80
60
60
80
80
Efficiency
2
η
min
[%]
η
typ
[%]
81
78
83
78
82
78
82
90
90
90
90
89
90
89
90
90
90
90
89
90
89
93
93
93
94
93
90
93
95
93
95
94
94
96
96
82
79
79
79
82
91
91
91
90
90
92
92
92
90
90
94
94
94
94
94
96
94
96
95
95
97
97
Type
designation
PSK3E25-7
PSS5A12-7
PSS5A14-2
PSK5A16-7
PSS5A18-2
PSK5A20-9
PSK5A25-9
PSS129-7
PSS1212-7
PSK1212-7
PSS1214-2
PSK1216-7
PSK1218-2
PSK1220-7
PSS129-7
PSS1212-7
PSK1212-7
PSS1214-2
PSK1216-7
PSK1218-2
PSK1220-7
PSS249-7
PSS2412-7
PSK2412-9
PSS2414-2
PSK2416-9
PSK2418-2
PSK2420-9
PSS369-9
PSS249-9
PSK3612-9
PSK3616-9
PSK3620-9
PSS489-9
PSK4812-9
Connector
type
H15S4
H15
H15
H15
H15
H15S4
H15S4
H15
H15
H15
H15
H15
H15
H15S4
H15
H15
H15
H15
H15
H15
H15S4
H15
H15
H15
H15
H15
H15
H15S4
H15
H15
H15
H15
H15S4
H15
H15
Options
-9, E, B, B1, G
-9, E, P, C, B,
B, B1
-9, E, P, C, B,
B, B1
-9, E, P, C, B,
-9, E, P, C, B,
-9, E, P, C, B,
-9, E, P, C, B,
-9, E, P, C, B,
B, B1
-9, E, P, C, B,
B, B1
-9, E, P, C, B,
B1, G
B1, G
B1, G
B1, G
B1, G
B1, G
B1, G
B1, G
B1, G
G
G
G
G
G
18 – 144
1
15 – 80
18 – 144
1
15 – 40
15 – 80
15 – 40
15 – 80
22 – 144
1
19 – 80
22 – 144
1
19 – 40
19 – 80
19 – 40
19 – 80
31 – 144
1
29 – 80
31 – 144
1
29 – 60
29 – 80
29 – 60
29 – 80
44 – 144
1
42 – 80
44 – 144
1
42 – 80
42 – 80
58 – 144
1
58 – 144
1
-9, E, C, B, B1,
-9, E, C, B, B1,
-9, E, C, B, B1,
B, B1
-9, E, C, B, B1,
B, B1
-9, E, C, B, B1,
-9, E, P, C, B,
-9, E, P, C, B,
-9, E, P, C, B,
B, B1
-9, E, P, C, B,
B, B1
-9, E, P, C, B,
B1, G
B1, G
B1, G
B1, G
B1, G
-9, E, P, C, B, B1, G
Surges up to 156 V for 2 s; see
Electrical Input Data
Efficiency at
V
i nom
and
I
o nom
.
Output voltage
V
o
set to 15 V by R input
Not available for PSK3E25
Note:
Non-standard input/output configurations or special
custom adaptions are available on request.
BCD20029-G Rev AA, 28-Apr-09
Page 2 of 20
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®
PSS, PSK Series Data Sheet
Positive Switching Regulators
Part Number Description
PSK 12 12 -7 E P C B G
Positive switching regulator in case S01, K01 ....... PSS, PSK
Nominal output voltage in volt .................................... 3.3
–
48
Nominal output current in ampere ................................ 9
–
25
Operational ambient temperature range
T
A
– 10 to 50 °C ..................................................... -2
– 25 to 71 °C ..................................................... -7
– 40 to 71 °C (optional) ..................................... -9
Options:
Inrush current limitation ..................................... E
Potentiometer to adjust
V
o 1
............................... P
Thyristor crowbar ............................................... C
Cooling plate large/small ............................. B, B1
RoHS-compliant for all 6 substances .............. G
2
1
2
Option P excludes R-features and vice versa.
G is always placed at the end of the part number. Consult Power-One for availability!
Example:
PSS 129-7EPCB = Positive switching regulator with output 12 V, 9 A, ambient temperature range of –25 to 71 °C,
inrush current limitation, potentiometer, crowbar, and large cooling plate option B.
Input voltage range, nominal output voltage and current,
protection degree, batch no., serial no., and data code
including production site, version (modificationstatus), and
date of production.
Product Marking
Type designation, applicable safety approvals and recognition
marks, warnings, pin allocation, Power-One patents and
company logo.
Identification of LED, test sockets, and optional potentiometer.
Functional Description
The switching regulators are using the buck converter
topology. The input is not electrically isolated from the output.
During the on period of the switching FET, current is
transferred to the output, and energy is stored in the output
choke. During the off period, this energy forces the current to
continue flowing through the output chocke to the load and
back through the freewheeling diode.
accomplished by varying on/off duty cycle.
Regulation
is
These regulators are ideal for applications, where an input to
output isolation is not necessary or where it is already provided
by an external front end, e.g., a transformer with rectifier. To
optimize customer’s needs, various options and accessories
are available.
03024a
Option E
I
i
Vi+
Fuse
30
32
4
I
o
Vo+
+
C
o
Input Filter
6
20
S+
22
T
V
i
C
i
Option C
Control
circuit
14
i
16
R
18
S–
V
o
26
Gi–
28
24
8
10
Go–
Option P
Fig. 1
Block diagram
BCD20029-G Rev AA, 28-Apr-09
Page 3 of 20
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–
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PSS, PSK Series Data Sheet
Positive Switching Regulators
Electrical Input Data
Table 2a: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Input
Characteristics
V
i
ΔV
io min
V
i o
I
i 0
V
i RFI
1
PSS5A14
PSK5A18
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
min
8
typ
max
40
2.9
7.3
I
o
= 0,
V
i min
–
V
i max
V
i nom
,
I
o nom
50
A
min
PSS1214
PSK1218
typ
max
40
3/4
1
7.3
50
A
min
29
PSS2414
PSK2418
typ
max
60
5
12
50
A
Unit
Operating input voltage
Min. diff. voltage
V
i
–
V
o
Undervoltage lock-out
No load input current
Input RFI level, EN 55011/22
0.15 – 30 MHz
15/19
1
VDC
mA
The second value is valid, if output is set to 15 V with the R-input.
Table 2b: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Input
PSK3E25
PSK5A25
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
min
8
typ
max
40
4.7/2.9
1
6.5
I
o
= 0,
V
i min
–
V
i max
V
i nom
, with option E
V
i nom
,
I
o nom
50
20
B
6.5
50
40
B
min
8
PSS5A12
PSK5A16
PSK5A20
typ
max
80
2.9
7.3
50
40
B
mA
A
PSS1212
PSK1216
PSK1220
min
15
typ
max
80
3
VDC
Unit
Characteristics
V
i
ΔV
io min
V
i o
I
i 0
I
inr p
V
i RFI
1
Operating input voltage
1
Min. diff. voltage
V
i
–
V
o
Undervoltage lock-out
No load input current
Peak value of inrush current
Input RFI level, EN 55011/22
0.15 – 30 MHz
Values for PSK3E25/PSK5A20
Table 2c: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Input
PSS1212
1
PSK1216
PSK1220
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
min
19
typ
max
80
4
7.3
I
o
= 0,
V
i min
–
V
i max
V
i nom
, with option E
V
i nom
,
I
o nom
50
40
B
12
50
50
B
min
29
PSS2412
PSK2416
PSK2420
typ
max
80
5
19
50
90
B
mA
A
min
42
PSS3612
PSK3616
PSK3620
typ
max
80
6
VDC
Unit
Characteristics
V
i
ΔV
io min
V
i o
I
i 0
I
inr p
V
i RFI
1
Operating input voltage
1
Min. diff. voltage
V
i
–
V
o
Undervoltage lock-out
No load input current
Peak value of inrush current
Input RFI level, EN 55011/22
0.15 – 30 MHz
Output set to 15 V with the R-input.
BCD20029-G Rev AA, 28-Apr-09
Page 4 of 20
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®
PSS, PSK Series Data Sheet
Positive Switching Regulators
Table 2d: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Input
Characteristics
V
i
ΔV
io min
V
i o
I
i 0
I
inr p
V
i RFI
1
2
PSS129
PSK1212
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
min
18
typ
max
144
2
6
12
I
o
= 0,
V
i min
–
V
i max
V
i nom
, with option E
V
i nom
,
I
o nom
50
4.5
B
min
22
PSS129
1
PSK1212
1
typ
max
144
2
7
12
50
4.5
B
min
31
PSS249
PSK2412
typ
max
144
2
7
24
50
4.5
B
Unit
Operating input voltage
Min. diff. voltage
V
i
–
V
o
Undervoltage lock-out
No load input current
Peak value of inrush current
Input RFI level, EN 55011/22
0.15 – 30 MHz
VDC
mA
A
Output set to 15 V with the R-input.
Surges up to 156 V for 2 s are allowed.
Table 2e: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Input
Characteristics
V
i
ΔV
io min
V
i o
I
i 0
I
inr p
V
i RFI
1
PSS369
PSK3612
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
min
18
typ
max
144
1
8
36
I
o
= 0,
V
i min
–
V
i max
V
i nom
, with option E
V
i nom
,
I
o nom
50
6
B
min
22
PSS488
PSK4812
typ
max
144
1
10
48
50
6
B
Unit
Operating input voltage
Min. diff. voltage
V
i
–
V
o
Undervoltage lock-out
No load input current
Peak value of inrush current
Input RFI level, EN 55011/22
0.15 – 30 MHz
VDC
mA
A
Surges up to 156 V for 2 s are allowed.
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
Table 3: Input fuses
Model
PSK3E25, PSK5A20, PSK5A25
PSK1220, PSK2420, PSK3620
PSK5A16, PSK1216, PSK1218
PSK2416, PSK2418, PSK3620
PSS5A12, PSS5A14,
PSS1212, PSK1212, PSS1214
PSS2412, PSK2412, PSS2414
PSS3612, PSK3612, PSK3616
PSK4812
PSS129, PSS249
PSS369, PSS489
Fuse type
F 25 A
F 20 A
F 15 A
Size
Supplier
6.3
×
32 mm Littlefuse
characteristic of a switched mode regulator. The input fuse
protects against severe defects.
The maximum permissible additionally superimposed ripple
v
i
of the input voltage (rectifier mode) at a specified input
frequency
f
i
has the following values:
v
i max
= 10 V
pp
at 100 Hz, or
V
pp
= 1000 Hz/f
i
• 1 V
The input fuses are specified in the table 3.
Inrush Current
Depending on the input source and the input impedance, the
inrush current into the converter may reach a very high peak
value during the switch-on sequence. It also determine the
rating of input devices such as switches, relays, fuses, etc. To
protect these input devices by limiting the inrush current, we
recommend the choice of the active inrush current limitation
circuit, option E.
F 10 A
BCD20029-G Rev AA, 28-Apr-09
Page 5 of 20
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