PSC Series Extended Data Sheet
Positive Switching Regulators (Industrial)
Input voltage up to 80 VDC
Single output of 5.1 - 36 VDC
No input to output isolation
•
High efficiency up to 96%
•
Wide input voltage range
• Low input to output differential voltage
•
Very good dynamic properties
32
1.3"
88
3.5"
151
5.9"
•
Input undervoltage lock-out
•
External output voltage adjustment and inhibit
•
Two temperature ranges
•
Continuous no-load and short-circuit proof
•
No derating
Safety according to IEC/EN 60950
Summary
The PSC series of positive switching regulators is designed
as power supply modules for electronic systems. Their ma-
jor advantages include a high level of efficiency that re-
mains virtually constant over the entire input voltage range,
high reliability, low ripple and excellent dynamic response.
Modules with input voltages up to 80 V are specially de-
signed for secondary switched and battery driven applica-
tions. The case design allows operation at nominal load up
to 71°C without additional cooling.
Model Selection and Key Data
Table 1: Type survey
Output
voltage
V
o nom
[V]
5.1
5.1
12
15
24
36
1
2
Output
current
I
o nom
[A]
12
10
8
8
8
8
Input
voltage range
V
i
[V]
1
7 - 40
8 - 80
15 - 80
19 - 80
29 - 80
42 - 80
Input
voltage
V
i nom
[V]
20
40
40
40
50
60
Efficiency
2
h
min
[%]
82
76
88
90
93
95
h
typ
[%]
83
79
89
91
94
96
Type
designation
PSC 5A12-7iR
PSC 5A10-7iR
PSC 128-7iR
PSC 158-7iR
PSC 248-7iR
PSC 368-7iR
Options
Superseded
old type
(phased-out)
PSR 512-7
PSR 510-7
PSR 128-7
PSR 158-7
PSR 248-7
PSR 368-7
-9, L, P, C, D
See:
Electrical Input Data:
D
V
io min
(min. differential voltage
V
i
–
V
o
).
Efficiency at
V
i nom
and
I
o nom
.
Non standard input/output configurations or special custom adaptions are available on request.
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) .............................. 7
Immunity to Environmental Conditions ............................ 8
Mechanical Data .............................................................. 9
Safety and Installation Instructions ................................ 10
Description of Options ................................................... 11
Accessories ................................................................... 12
EC-Declaration of Conformity ........................................ 13
Summary .......................................................................... 1
Model Selection and Key Data ......................................... 1
Part Number Description ................................................. 2
Functional Description ..................................................... 2
Electrical Input Data ......................................................... 3
Electrical Output Data ...................................................... 4
Auxiliary Functions ........................................................... 6
REV. MAY 12, 2004
Page 1 of 13
PSC Series Extended Data Sheet
Positive Switching Regulators (Industrial)
Part Number Description
PSC 12 8 -7 L i R P C D
Positive switching regulator in case C03 .................... PSC
Nominal output voltage in volt (5A for 5.1 V) ......... 5A - 36
Nominal output current in ampere ............................ 8 - 12
Operational ambient temperature range
T
A
–25 to 71°C ......................................................... -7
–40 to 71°C (option) ............................................ -9
Input filter (option) ............................................................ L
Inhibit input ....................................................................... i
Control input for output voltage adjustment
1
.................. R
Potentiometer
1
(option) ................................................... P
Thyristor crowbar (option) ............................................... C
Input/output voltage monitor (option) ......................... D/D1
1
Feature R excludes option P and vice versa.
Example:
PSC 128-7LiPC = A positive switching regulator with a 12 V, 8 A output, ambient temperature range of
–25 to 71°C, input filter, inhibit input, output adjust potentiometer and thyristor crowbar.
Functional Description
The switching regulators are designed using the buck con-
verter topology. See also:
Technical Information: Topolo-
gies.
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 in the form of flux. During the off period, this energy
forces the current to continue flowing through the output, to
the load and back through the freewheeling diode. Regula-
tion is accomplished by varying the on to off duty ratio of the
power switch.
I
i
These regulators are ideal for a wide range of applications,
where input to output isolation is not necessary, or where
already provided by an external front end (e.g. a trans-
former with rectifier). To optimise customer’s needs, addi-
tional options and accessories are available.
03018
Vi+
Fuse
1
Input Filter
Option L
Vo+
D (option)
i
Control circuit
Option C
R
G
I
o
V
i
V
o
Gi–
V
t
Option D
1
Fuse
V
o
Option P
Go–
fitted for option
Fig. 1
Block diagram
REV. MAY 12, 2004
Page 2 of 13
PSC Series Extended Data Sheet
Positive Switching Regulators (Industrial)
Electrical Input Data
General Conditions:
T
A
= 25°C, unless
T
C
is specified
Table 2a: Input data
Input
Characteristics
Conditions
PSC 5A12
min
7
typ
max
40
1.9
6.3
7.3
45
150
5
40
250
5
40
350
25
125
B
B
40
250
5
40
350
25
125
B
A
µs
min
8
PSC 5A10
typ
max
80
2.9
7.3
35
mA
A
µs
min
15
PSC 128
typ
max
80
3
Unit
VDC
V
i
Operating input voltage
D
V
io min
Min. diff. voltage
V
i
–
V
o 1
I
o
= 0 -
I
o nom
T
C min
-
T
C max
V
i o
I
i 0
I
inr p
t
inr r
t
inr h
I
inr p
t
inr r
t
inr h
u
i RFI
Undervoltage lock-out
No load input current
Peak value of inrush current
Rise time
Time to half-value
Peak value of inrush current
Rise time
Time to half-value
Input RFI level, EN 55011/22
V
i nom
,
I
o nom
0.15 - 30 MHz
with option L
2
I
o
= 0,
V
i min
-
V
i max
V
i nom
without option L
V
i nom
with option L
250
25
125
Table 2b: Input data
Input
Characteristics
Conditions
min
19
PSC 158
typ
max
80
4
7.3
12
35
250
5
40
250
5
40
350
25
125
B
B
35
250
5
40
350
25
125
B
A
µs
min
29
PSC 248
typ
max
80
5
19
40
mA
A
µs
min
42
PSC 368
typ
max
80
6
1
Unit
VDC
V
i
V
i o
I
i 0
I
inr p
t
inr r
t
inr h
I
inr p
t
inr r
t
inr h
u
i RFI
1
Operating input voltage
D
V
io min
Min. diff. voltage
V
i
–
V
o 1
Undervoltage lock-out
No load input current
Peak value of inrush current
Rise time
Time to half-value
Peak value of inrush current
Rise time
Time to half-value
I
o
= 0 -
I
o nom
T
C min
-
T
C max
I
o
= 0,
V
i min
-
V
i max
V
i nom
without option L
V
i nom
with option L
350
25
125
Input RFI level, EN 55011/22
V
i nom
,
I
o nom
0.15 - 30 MHz
with option L
2
2
The minimum differential voltage
D
V
io min
between input and output increases linearly by 0 to 1 V between
T
A
= 46°C and 71°C
(T
C
= 70°C and 95°C)
With additional external input capacitor
C
e
= 120
µF/100
V (e.g. Nichicon PF series, or equivalent).
04016
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 super-
imposed interference voltages. See also:
Technical Infor-
mation: Application Notes.
+
Vi+
a
b
Gi–
Vo+
Go–
Fig. 2
Switching regulator with long supply lines.
REV. MAY 12, 2004
Page 3 of 13
PSC Series Extended Data Sheet
Positive Switching Regulators (Industrial)
Electrical Output Data
General Conditions:
–
T
A
= 25°C, unless
T
C
is specified
– With R or option P, output voltage
V
o
=
V
o nom
at
I
o nom
Table 3a: Output data
Output
Characteristics
Conditions
PSC 5A12
min
5.07
0
12.0
25
29
30
20
130
40
±1
±0.02
typ
max
5.13
12.0
15.6
30
34
45
25
min
5.07
0
10.0
25
29
30
20
130
50
±1
±0.02
PSC 5A10
typ
max
5.13
10.0
13.0
30
34
45
25
min
11.93
0
8.0
50
54
50
30
130
60
±2
±0.02
µs
mV/K
%/K
PSC 128
typ
max
12.07
8.0
10.4
90
94
75
35
mV
mV
pp
Unit
V
A
V
o
I
o
I
oL
u
o
Output voltage
Output current
1
Output current limitation
response
Output
voltage
noise
Switching freq.
Total
V
i nom
,
I
o nom
V
i min
-
V
i max
T
C min
-
T
C max
V
i nom
,
I
o nom
IEC/EN 61204
2
BW = 20 MHz
V
i min
-
V
i max
,
I
o nom
V
i nom
,
I
o
= 0 -
I
o nom
D
V
o U
D
V
o l
Static line regulation
Static load regulation
Dynamic
load
regulation
u
o d
t
d
a
Uo
Voltage deviat.
V
i nom
I
↔
1
/
3
I
o nom
Recovery time
o nom
IEC/EN 61204
2
Temperature coefficient
D
V
o
/DT
C
(T
C min
-
T
C max
)
V
i min
-
V
i max
I
o
= 0 -
I
o nom
Table 3b: Output data
Output
Characteristics
Conditions
min
14.91
0
8.0
50
54
70
30
130
60
±3
±0.02
PSC 158
typ
max
15.09
8.0
10.4
90
94
100
45
min
23.86
0
8.0
55
60
150
120
150
80
±5
±0.02
PSC 248
typ
max
24.14
8.0
10.4
150
155
220
160
min
35.78
0
8.0
80
85
200
125
220
100
±8
±0.02
µs
mV/K
%/K
PSC 368
typ
max
36.22
8.0
10.4
190
195
270
160
mV
mV
pp
Unit
V
A
V
o
I
o
I
oL
u
o
Output voltage
Output current
1
Output current limitation
response
Output
voltage
noise
Switching freq.
Total
V
i nom
,
I
o nom
V
i min
-
V
i max
T
C min
-
T
C max
V
i nom
,
I
o nom
IEC/EN 61204
2
BW = 20 MHz
V
i min
-
V
i max
,
I
o nom
V
i nom
,
I
o
= 0 -
I
o nom
D
V
o U
D
V
o l
Static line regulation
Static load regulation
Dynamic
load
regulation
u
o d
t
d
a
Uo
Voltage deviat.
V
i nom
I
↔
1
/
3
I
o nom
Recovery time
o nom
IEC/EN 61204
2
Temperature coefficient
D
V
o
/DT
C
(T
C min
-
T
C max
)
V
i min
-
V
i max
I
o
= 0 -
I
o nom
1
2
See also:
Thermal Considerations.
See:
Technical Information: Measuring and Testing.
REV. MAY 12, 2004
Page 4 of 13
PSC Series Extended Data Sheet
Positive Switching Regulators (Industrial)
V
o
Vod
05010
Parallel and Series Connection
Outputs of equal nominal voltages can be parallel-con-
nected. However, the use of a single unit with higher output
power, because of its power dissipation, is always a better
solution.
In parallel-connected operation, one or several outputs may
operate continuously at their current limit knee-point which
will cause an increase of the heat generation. Conse-
quently, the max. ambient temperature value should be re-
duced by 10 K.
Outputs can be series-connected with any other module. In
series-connection the maximum output current is limited by
the lowest current limitation. Electrically separated source
voltages are needed for each module!
Short Circuit Behaviour
A constant current limitation circuit holds the output current
almost constant whenever an overload or a short circuit is
applied to the regulator's output. It acts self-protecting and
recovers – in contrary to the fold back method – automati-
cally after removal of the overload or short circuit condition.
V
o
/V
o nom
1.2
1.0
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
D
V
o I
D
V
o I
t
d
I
o
/I
o nom
1
Vod
t
d
t
0
≥10
µs
≥10
µs
t
Fig. 3
Dynamic load regulation.
Thermal Considerations
When a switching regulator is located in free, quasi-station-
ary air (convection cooling) at a temperature
T
A
= 71°C and
is operated at its nominal output current
I
o nom
, the case
temperature
T
C
will be about 95°C after the warm-up
phase, measured at the
Measuring point of case tempera-
ture T
C
(see:
Mechanical Data).
Under practical operating conditions, the ambient tempera-
ture
T
A
may exceed 71°C, provided additional measures
(heat sink, fan, etc.) are taken to ensure that the case tem-
perature
T
C
does not exceed its maximum value of 95°C.
Example: Sufficient forced cooling allows
T
A max
= 85°C. A
simple check of the case temperature
T
C
(T
C
≤
95°C) at full
load ensures correct operation of the system.
I
o
/I
o nom
Forced cooling
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
05031
I
o nom
05033
I
o L
I
o
/I
o nom
Fig. 5
Overload, short-circuit behaviour V
o
versus I
o
.
Convection cooling
T
C max
T
A min
50
60
70
80
90
100
T
A
[˚C]
Fig. 4
Output current derating versus temperature
Output Protection
A voltage suppressor diode which in worst case conditions
fails into a short circuit (or a thyristor crowbar, option C)
protects the output against an internally generated over-
voltage. Such an overvoltage could occur due to a failure of
either the control circuit or the switching transistor. The out-
put protection is not designed to withstand externally ap-
plied overvoltages. The user should ensure that systems
with Power-One power supplies, in the event of a failure, do
not result in an unsafe condition (fail-safe).
REV. MAY 12, 2004
Page 5 of 13
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