PSA/PSR Series Data Sheet
Positive Switching Regulators
Features
• RoHS lead-free-solder and lead-solder-exempted
products are available
•
Compliant to EN 45545 (version V104 or later)
•
Input voltage up to 144 VDC
•
Single output 5 to 48 V
•
No input-to-output isolation
•
High efficiency up to 95%
•
Extremely wide input voltage range
• Low input-to-output differential voltage
•
Very good dynamic properties
•
Input undervoltage lockout
25
1.0"
50
2.0"
70
2.8"
• Output voltage adjustment and inhibit function
•
Continuously no-load and short-circuit proof
•
All boards are coated with a protective lacquer
•
Board or chassis mountable
Safety-approved to the latest edition of IEC/EN 60950-1 and
UL/CSA 60950-1
Description
The PSA Series of positive switching regulators are designed
as power supplies for electronic systems when 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 especially designed for secondary-switched and
battery-driven mobile applications. The regulators are suitable
for railway applications according to EN 50155 and EN 50121.
The case design allows for operation up to 71 °C. The PSA
Series is designed for wall or chassis mounting with faston
connections or with solder pins for insertion into a PCB.
Various options are available to adapt the regulators to different
applications.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) ................................. 10
Immunity to Environmental Conditions ............................... 11
Mechanical Data ................................................................. 12
Safety and Installation Instructions ..................................... 12
Description of Options ........................................................ 13
Accessories ......................................................................... 14
Description ............................................................................ 1
Model Selection .................................................................... 2
Functional Description .......................................................... 3
Electrical Input Data .............................................................. 4
Electrical Output Data ........................................................... 6
Auxiliary Functions ................................................................ 9
Copyright © 2017, Bel Power Solutions Inc. All rights reserved.
BCD20025-G Rev AE, 13-Jul-2017
MELCHER
The Power Partners.
Page 1 of 15
PSA/PSR Series Data Sheet
Positive Switching Regulators
Model Selection
Table 1: PSA Series
Output
voltage
V
o nom
[V ]
5
5
5
5
5.1
5.1
12
12
12
15
15
15
24
24
24
36
36
48
1
2
3
Output
current
I
o nom
[A]
2
3
4
5
2
5
1.5
2.5
3
1.5
2.5
3
1.5
2
2.5
1.2
2
1
Operating input
voltage range
V
i
[V ]
8
8
7
7
–
–
–
–
80
80
40
35
Nom. input
voltage
V
i nom
[V ]
40
40
20
20
20
20
60
40
20
60
40
30
60
50
40
80
60
80
Efficiency
2
η
min
[%]
71.5
85
82
81
75
83
86
86
89
86
88
90
92
91
93
94
92
94
η
typ
[% ]
74
87
83
83
-
-
87
87
-
87
89
-
93
92
-
95
94
95
Type
designation
PSR52-7
PSR53-9 G
PSR54-9 iG
PSA55-9 iG
PSA5A2-2
PSA5A5-2
PSA121.5-9i RG
PSR122.5-9 iG
PSA123-2
PSA151.5-9i RG
PSR152.5-9 G
PSA153-2
PSA241.5-9i RG
PSR242-9 iG
PSA242.5-2G
PSA361-9iRG
PSR362-9 iRG
PSA481-9iRG
Options
Y
-7, i, P, R, Y, non-G
-7,
P, R, Y, non-G
-7,
R, Y, non-G
i RY
3
-7,
i RY
3
-7,
Y, non-G
-7,
P, R, Y, non-G
i RY
3
-7, Y, non-G
-7,
P, R, Y, non-G
i RY
3
-7, Y, non-G
-7,
P, R, Y, non-G
i RY
3
, non-G
-7,
Y, non-G
-7,
Y, non-G
-7,
Y, non-G
8 – 40
7 – 35
18 – 144
1
15 – 80
15 – 40
22 – 144
1
19 – 80
19 – 40
31 – 144
1
29 – 80
29 – 60
44 – 144
1
42 – 80
58 –144
1
Surges up to 156 V for 2 s; see
Electrical Input Data
Efficiency at
V
i nom
and
I
o nom
Options iRY in a package
NFND: Not for new designs.
Preferred for new designs
Note:
The output voltage
V
o
is adjusted to 108% of
V
o nom
for all models with option P or R, if they don’t have option Y
in addition.
Part Number Description
Positive switching regulator in case A01 ....... PSA or PSR
Nominal output voltage in Volt ................................ 5 to 48
Nominal output current in Ampere ............................ 1 to 5
Operational ambient temperature range
T
A
–10 to 50 °C ........................................................ -2
–25 to 50 °C (customer-specific models) ............ -5
–25 to 71 °C (option) ........................................... -7
–40 to 71 °C ........................................................ -9
other (customer-specific models) ....................... - 0
Inhibit input (standard for all -7 and -9 models) ............... i
Control input for output voltage adjustment
1 ..........................
R
Potentiometer
1
(option, NFND) ........................................ P
RoHS-compliant for all 6 substances ............................. G
1
PSA 12 1.5 -9 i R G
Option P (not available for PSA models) excludes feature R.
Note:
The sequence of options must follow the order above.
Example:
PSA121.5 - 9iRG designates a positive switching
regulator with an output 12 V, 1.5 A, ambient temperature –40
to 71 °C, inhibit input, output voltge adjust by R-pin, RoHS-
compliant for all 6 substances.
BCD20025-G Rev AE, 13-Jul-2017
MELCHER
The Power Partners.
Page 2 of 15
PSA/PSR Series Data Sheet
Positive Switching Regulators
Customer-specific Models
Positive switching regulator in case A01 .................... PSA
Nominal output voltage in Volt (without decimals) ......... 12
Decimal places:
0.0 V ..................................................................... Z
0.1 V ..................................................................... A
0.15 V ................................................................... B
0.2 V .................................................................... C
0.25 V .................................................................. D
0.3 V ..................................................................... E
0.4 V ..................................................................... F
0.5 V .................................................................... G
0.6 V .................................................................... H
0.7 V ..................................................................... J
0.8 V ..................................................................... K
0.9 V ..................................................................... L
other ..................................................................... Y
Output current in Ampère ................................................ 3
Identification character ............................................ A, B, ..
Temperature range and options, e.g. ...................... -9 i RG
PSA 12 Z 3 A -9 i RG
Produkt Marking
Type designation, applicable safety approval marks, pin
allocation, patent information, company logo.
Label with input voltage range, nominal output voltage and
current, protection degree, batch no., serial no., data code
comprising production site, version (modification status), date
of production.
Functional Description
The switching regulators use the buck converter topology. The
input is not electrically isolated from the output. During the on
period of the switching transistor, 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, to the load, and back through the
freewheeling diode. Regulation is accomplished by varying the
duty cycle (on/off ratio) of the main switch. The regulator starts
operating only when the input voltage exceeds the trigger level
of the UVL (undervoltage lockout).
These regulators are ideal for a wide range of applications,
where input to output isolation is not necessary or is already
provided by an external front end (e.g., a transformer with
rectifier). To optimize customers’ needs, additional options and
accessories are available.
03016b
I
i
Bead
I
o
Vo+
Input Filter
Vi+
i
Control circuit
C
i
R
+
V
o
V
i
C
e
+
Gi–
Go–
Fig. 1
Block diagram.
The resistance of the input circuit
Option P
BCD20025-G Rev AE, 13-Jul-2017
MELCHER
The Power Partners.
Page 3 of 15
PSA/PSR Series Data Sheet
Positive Switching Regulators
Electrical Input Data
General Conditions:
T
A
= 25°C, unless
T
C
is specified
Table 2a: Input data
Model
Characteristics
V
i
Operating input voltage
∆V
io min
Min. diff. voltage
V
i
–
V
o
V
i UVL
I
i 0
I
inr p
R
i
C
i
v
i RFI
Undervoltage lockout
No load input current
Peak value of inrush current
Input resistance
Input capacity
EN 55011, 0.15 – 30 MHz
V
i nom
,
I
o nom
I
o
= 0,
V
i min
–V
i max
V
i nom
75
10
6.8
B
1
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
PSA55
PSA5A5
PSR54
PSA5A2
max
40
2.9
7.3
7.6
50
75
10
6.8
--
mA
A
mΩ
µF
Class
V
Unit
min typ max min typ max min typ max min typ
7
35
2
6.3
6.6
45
75
10
6.8
--
6.3
7
35
1.9
6.4
50
75
10
6.8
B
1
6.3
7
40
2
6.5
45
8
Tab. 2b: Input data
Model
Characteristics
V
i
Operating input voltage
∆V
io min
Min. diff. voltage (V
i
–
V
o
)
V
i UVL
I
i 0
I
inr p
R
i
C
i
v
i RFI
Undervoltage lockout
No load input current
Peak value of inrush current
Input resistance
Input capacity
EN 55011, 0.15 – 30 MHz
V
i nom
,
I
o nom
I
o
= 0,
V
i min
–
V
i max
V
i nom
75
10
6.8
--
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
min
15
PSA123
typ
max
40
3
7.3
8.0
50
150
10
6.8
--
7.3
min
19
PSA153
typ
max
40
4
9.0
50
150
10
6.8
--
12
PSA242.5
min
29
typ
max
60
5
13.7
50
mA
A
mΩ
µF
Class
V
Unit
Tab. 2c: Input data
Model
Characteristics
V
i
Operating input voltage
∆V
io min
Min. diff. voltage (V
i
–
V
o
)
V
i UVL
I
i 0
I
inr p
R
i
C
i
v
i RFI
1
2
PSR52
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
min
8
typ
max
80
3
7.3
I
o
= 0,
V
i min
–
V
i max
V
i nom
150
10
6.8
V
i nom
,
I
o nom
B
2
7.6
40
min
8
PSR53
typ
max
80
3
7.3
7.6
40
150
10
6.8
B
2
PSR122.5
min
15
typ
max
80
3
7.3
8
35
150
10
6.8
B
2
Unit
V
Undervoltage lockout
No load input current
Peak value of inrush current
Input resistance
Input capacity
EN 55011, 0.15 – 30 MHz
mA
A
mΩ
µF
Class
With
C
e
= 470 µF / 40 V and input filter FP38; see
Accessories.
With
C
e
= 470 µF / 100 V and input filter FP80; see
Accessories.
BCD20025-G Rev AE, 13-Jul-2017
MELCHER
The Power Partners.
Page 4 of 15
PSA/PSR Series Data Sheet
Positive Switching Regulators
Table 2d: Input data. General Conditions as per table 2a
Model
Characteristics
V
i
Operating input voltage
∆V
io min
Min. diff. voltage
V
i
–
V
o
V
i UVL
I
i 0
I
inr p
R
i
C
i
v
i RFI
Undervoltage lockout
No load input current
Peak value of inrush current
Input resistance
Input capacity
EN 55011, 0.15 – 30 MHz
V
i nom
,
I
o nom
I
o
= 0,
V
i min
–V
i max
V
i nom
150
10
6.8
B
2
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
PSR152.5
PSR242
PSR362
PSA121.5
max
144
1
6
12
12.5
20
150
10
2.2
B
3
mA
A
mΩ
µF
Class
V
Unit
min typ max min typ max min typ max min typ
19
80
3
7.3
9.0
35
150
10
6.8
B
2
12
29
80
4
13.7
35
150
10
6.8
B
2
42
80
5
19 20.5
40
18
Table 2e: Input data. General Conditions as per table 2a
Model
Characteristics
V
i
Operating input voltage
∆V
io min
Min. diff. voltage
V
i
–
V
o
V
i UVL
I
i 0
I
inr p
R
i
C
i
v
i RFI
1
2
3
PSA151.5
Conditions
I
o
= 0 –
I
o nom
T
C min
–
T
C max
PSA241.5
PSA361
PSA481
max
144
1
10
44
45
25
150
10
2.2
B
3
Unit
min typ max min typ max min typ max min typ
22
144
1
31
7
18 18.5
22
144
1
7
23
20
150
10
2.2
B
3
150
10
2.2
B
3
31
44
144
1
8
32
25
58
V
Undervoltage lockout
No load input current
Peak value of inrush current
Input resistance
Input capacity
EN 55011, 0.15 – 30 MHz
V
i nom
,
I
o nom
I
o
= 0,
V
i min
–V
i max
V
i nom
20
150
10
2.2
B
3
mA
A
mΩ
µF
Class
Surges up to 156 V for 2 s
With
C
e
= 470 µF/ 100 V and input filter FP80; see
Accessories
With
C
e
= 2
×
3.3 µF / 250 V MKT and input filter FP144; see
Accessories
External Input Circuitry
The sum of the lengths of the supply lines to the source or to
the nearest capacitor
≥100 µF
(a + b) should not exceed 5 m,
unless option L is fitted. This option is recommended in order
to prevent power line oscillations and reduce superimposed
interference voltages.
04016a
+
Vi+
a
b
Gi–
Vo+
Go–
Fig. 2
Switching regulator with long supply lines.
BCD20025-G Rev AE, 13-Jul-2017
MELCHER
The Power Partners.
Page 5 of 15
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