Positive Switching Regulators
PSK / PSS Series
111
4.4"
3U
80
3.2"
16 TE
168
6.6"
The PSK/PSS Series of positive switching regulators is de-
signed as power supplies for electronic systems, where no
input-to-output isolation is required. Their major advantages in-
clude 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 types of housing 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 differ-
ent applications. Connector type: H15 or H15S4, depending on
output current.
Features
• RoHS lead-free-solder and lead-solder-exempted
products are available
• 5 year warranty for RoHS compliant products with an
extended temperature range
• Input voltage up to 144 VDC
• Single output of 5.1 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
Safety-approved to the latest edition of IEC/EN 60950-1
and UL/CSA 60950-1
111
4.4"
3U
60
2.4"
12 TE
168
6.6"
Table of Contents
Description............................................................................1
Model Selection ....................................................................2
Functional Description ..........................................................3
Electrical Input Data .............................................................4
Electrical Output Data...........................................................6
Auxiliary Functions .............................................................12
Electromagnetic Compatibility (EMC) .................................14
Mechanical Data .................................................................15
Immunity to Environmental Conditions ...............................16
Safety and Installation Instructions .....................................19
Description of Options ........................................................20
Accessories ........................................................................21
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BCD20029-G Rev AE, 31-Jan-2019
PSK / PSS Series
Model Selection
Table 1: Model Selection
Output
voltage
V
o nom
[V]
5.1
12
12
12
12
12
15
3
15
3
15
3
15
3
15
3
24
24
24
24
24
24
36
36
36
36
36
48
1
2
3
4
Positive Switching Regulators
Output
current
I
o nom
[A]
20
9
12
12
16
20
9
12
12
16
20
9
12
12
14
16
20
9
12
12
16
20
12
Operating input
voltage range
V
i
[V]
8 - 80
18 - 144
1
15 - 80
18 - 144
1
15 - 80
15 - 80
22 - 144
1
19 - 80
22 - 144
1
19 - 80
19 - 80
31 - 144
1
29 - 80
31 - 144
1
29 - 60
29 - 80
29 - 80
44 - 144
1
42 - 80
44 - 144
1
42 - 80
42 - 80
58 - 144
1
Nom. input
voltage
V
o nom
[V]
40
60
40
60
40
40
60
40
60
40
40
60
50
60
40
50
50
80
60
80
60
60
80
Efficiency
2
η
min
[%]
78
90
90
90
89
89
90
90
90
89
89
93
93.5
93.5
94.5
93.5
93.5
95
95
95
94.5
94.5
96
η
max
[%]
79
91
91
91
90
90
92
92
92
90
90
94
94
94
94
95
96
94
96
95
95
97
Type
designation
4
PSK5A20-9ECKG
PSS129-9G
PSS1212-9G
PSK1212-9G
PSK1216-9G
PSK1220-9G
PSS129-9G
PSS1212-9G
PSK1212-9G
PSK1216-9G
PSK1220-9G
PSS249-9G
PSS2412-9G
PSK2412-9G
PSS2414-2G
PSK2416-9G
PSK2420-9G
PSS369-9G
PSS3612-9G
PSK3612-9G
PSK3616-9G
PSK3620-9G
PSK4812-9G
Connector
type
H15
H15
H15
H15
H15
H15S4
H15
H15
H15
H15
H15S4
H15
H15
H15
H15
H15
H15S4
H15
H15
H15
H15
H15S4
H15
Options
B, B1
-7,
E, B, B1
B, B1
-7,
E, C, B, B1
-7,
E, C, B, B1
-7,
E, C, K, B, B1
E, B, B1
-7,
E, B, B1
-7,
E, C, B, B1
-7,
E, C, B, B1
-7,
E, C, K, B, B1
-7,
E, C, B, B1
-7,
E, B, B1
-7,
E, C, B, B1
B, B1
-7,
E, C, B, B1
-7,
E, C, K, B, B1
-7,
E, B, B1
B, B1
-7,
E, C, B, B1
-7,
E, C, B, B1
-7,
E, C, K, B, B1
-7,
E, C, B, B1
Surges up to 156 V for 2 s; see
Electrical Input Data
Efficiency at
V
i nom
and
I
o nom
. Models with opt. K (standard H15 connector) exhibit approx. 1 to 2% lower efficiency.
Output voltage
V
o
set to 15 V by R input.
Part numbers without suffix ‘G’ use the leaded solder exemption.
Note:
Non-standard input/output configurations or special custom adaptations are available on request.
NFND: Not for new designs.
Preferred for new designs.
Part Number Description
PSK 12 12 -9 E C B G
Positive switching regulator in case S01, K01 ........PSS, PSK
Nominal output voltage in Volt .................................... 5.1
–
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
Thyristor crowbar................................................ C
Standard H15 connector .....................................K
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.
Example:
PSS129-9ECB = Positive switching regulator with output 12 V, 9 A, ambient temperature range of –25 to 71 °C, inrush
current limitation, crowbar, and large cooling plate option B.
Note:
The sequence of options must follow the order above.
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PSK / PSS Series
Product Marking
Positive Switching Regulators
Type designation, applicable approvals marks, warnings, pin allocation, identification of LED, test sockets, and optional potentiometer.
Label with input voltage range, output voltage and current, protection degree, batch and serial no., and data code including production
site, version, and date of production.
Functional Description
The switching regulators are using the buck 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 choke and the freewheeling diode to the load. Regulation is accomplished
by varying on/off duty cycle. Switching frequency is approx. 100 kHz. The converters exhibit an undervoltage monitor to prevent
high currents at low input voltage, but no overvoltage monitor.
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 customers’ needs, various options and accessories are available.
03024a
Option E
I
i
Vi+
30
32
Fuse
C
o
+
4
6
Vo+
I
o
20
S+
22
T
14
i
16
R
18
S–
8
10
Input Filter
V
i
C
i
Option C
Control
circuit
V
o
Gi–
26
28
24
Go–
Option P
+
Fig. 1
Block diagram
–
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PSK / PSS Series
Electrical Input Data
Positive Switching Regulators
Table 2a: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Model
Characteristics
V
i
∆V
io min
V
i o
I
i 0
I
inr p
C
i
Operating input voltage
Min. diff. voltage
V
i
–
V
o
Undervoltage lockout
No-load input current
Inrush peak current
Input capacitance
Conditions
I
o
= 0 –
I
o nom
,
T
C min
–
T
C max
I
o
= 0,
V
i min
–
V
i max
V
i nom
, with option E
1600
min
29
12
50
40
1600
PSS2414
typ
max
60
5
6.5
50
40
1600
min
8
PSK5A20
typ
max
80
2.9
7.3
50
40
mA
A
µF
min
15
PSS1212
PSK1216
PSK1220
typ
max
80
3
VDC
Unit
Table 2b: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Model
Characteristics
V
i
∆V
io min
V
i o
I
i 0
I
inr p
C
i
1
PSS1212
1
PSK1216
1
PSK1220
1
Conditions
I
o
= 0 –
I
o nom
,
T
C min
–
T
C max
I
o
= 0,
V
i min
–
V
i max
V
i nom
, with option E
1600
min
19
7.3
50
40
typ
max
80
4
min
29
Operating input voltage
1
Min. diff. voltage
V
i
–
V
o
Undervoltage lockout
No-load input current
Inrush peak current
Input capacitance
PSS2412
PSK2416
PSK2420
typ
max
80
5
12
50
50
1600
min
42
PSS3612
PSK3616
PSK3620
typ
max
80
6
19
50
90
1600
Unit
VDC
mA
A
µF
Output set to 15 V with the R-input.
Table 2c: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Model
Characteristics
V
i
∆V
io min
V
i o
I
i 0
I
inr p
C
i
1
2
PSS129 / PSK1212
Conditions
I
o
= 0 –
I
o nom
,
T
C min
–
T
C max
I
o
= 0,
V
i min
–
V
i max
V
i nom
, with option E
620
min
18
12
50
4.5
typ
max
144
2
6
Operating input voltage
1
Min. diff. voltage
V
i
–
V
o
Undervoltage lockout
No-load input current
Inrush peak current
Input capacitance
PSS129
1
/ PSK1212
1
min
22
12
50
4.5
620
typ
max
144
2
7
PSS249 / PSK2412
min
31
24
50
4.5
620
typ
max
144
2
7
Unit
VDC
mA
A
µF
Output set to 15 V with the R-input.
Surges up to 156 V for 2 s are allowed (no shutdown).
Table 2d: Input data. General Conditions: T
A
= 25 °C, unless T
C
is specified
Model
Characteristics
V
i
∆V
io min
V
i o
I
i 0
I
inr p
C
i
1
PSS369 / PSK3612
Conditions
I
o
= 0 –
I
o nom
,
T
C min
–
T
C max
I
o
= 0,
V
i min
–
V
i max
V
i nom
, with option E
620
min
18
36
50
6
typ
max
144
2
8
min
22
Operating input voltage
1
Min. diff. voltage
V
i
–
V
o
Undervoltage lockout
No-load input current
Inrush peak current
Input capacitance
PSK4812
typ
max
144
2
10
48
50
6
620
Unit
VDC
mA
A
µF
Surges up to 156 V for 2 s are allowed (no shutdown).
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PSK / PSS Series
Input Filter and Fuse
Positive Switching Regulators
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 characteristic of a switched mode regulator. The input fuse protects against
fatal defects; see table 3.
Table 3: Input fuses
Model
PSK5A20
PSK1220, PSK2420, PSK3620
PSK1216
PSK2416, PSK2418, PSK3620
PSS1212, PSK1212
PSS2412, PSK2412
PSS3612, PSK3612, PSK3616
PSK4812
PSS129, PSS249, PSS369
Fuse type
F 25 A
F 20 A
6.3 x 32 mm
F 15 A
Littlefuse
Size
Supplier
F 10 A
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
= 1000 Hz /f
i
• 1 V (or 10
V
pp
at 100 Hz)
Inrush Current
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:
JM001c
L
ext
+
R
ext
Vi+
Converter
R
i
C
i
Vo+
Vi–
Vo–
Fig. 2
Equivalent input circuit
V
i source
I
inr p
=
_________
(R
s ext
+
R
i
)
To limit the inrush current, we recommend the choice of the active inrush current limitation circuit, option E.
Load
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