PSB Series Extended Data Sheet
Positive Switching Regulator (Industrial)
Input voltage up to 80 V DC
Single output of 5.1 to 36 V DC
No input to output isolation
•
High efficiency up to 96%
•
Wide input voltage range
• Low input to output differential voltage
•
Very good dynamic properties
•
Input undervoltage lock-out
•
External output voltage adjustment and inhibit
32
1.3"
69
2.7"
106
4.2"
•
2 temperature ranges
•
Continuous no-load and short-circuit proof
•
No derating
Safety according to IEC/EN 60950
Summary
The PSB 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 range, high
reliability, low ripple and excellent dynamic response. Mod-
ules with input voltages up to 80 V are specially designed
for secondary switched and battery driven applications. 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]
7
6
5
5
5
5
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
Type
designation
PSB 5A7-7iR
PSB 5A6-7iR
PSB 125-7iR
PSB 155-7iR
PSB 245-7iR
PSB 365-7iR
Options
h
min
[%]
h
typ
[%]
83
79
89
90
93
95
84
81
90
92
95
96
-9, L, P, C
Superseded
old type
(phased-out)
PSR 57-7
PSR 55-7
PSR 124-7
PSR 154-7
PSR 244-7
PSR 364-7
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.
See also:
Commercial Information: Inquiry Form for Customized Power Supply.
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. OCT 17, 2003
Page 1 of 13
PSB Series Extended Data Sheet
Positive Switching Regulator (Industrial)
Part Number Description
PSB 12 5 -7 L i R P C
Positive switching regulator in case B02 ................... PSB
Nominal output voltage in volt (5A for 5.1 V) ........ 5A, ...36
Nominal output current in ampere .......................... 5, 6, 7
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
1
Feature R excludes option P and vice versa.
Example:
PSB 125-7LiPC = A positive switching regulator with a 12 V, 5 A output, ambient temperature range of
–25 to 71°C, input filter, inhibit input, 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. During the off period, this energy forces the current
to continue flowing through the output choke to the load
and back through the freewheeling diode. Regulation is
accomplished by varying the on/off duty ratio of the power
switch.
I
i
Option C
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 transformer with rectifier). To optimise
customer’s needs, additional options and accessories are
available.
03011
I
o
Input Filter
Option L
Vi+
Vo+
i
Control circuit
Option C
V
i
V
o
R
G
Gi–
Go–
Option P
Fig. 1
Block diagram
REV. OCT 17, 2003
Page 2 of 13
PSB Series Extended Data Sheet
Positive Switching Regulator (Industrial)
Electrical Input Data
General Conditions:
T
A
= 25°C, unless
T
C
is specified
Table 2a: Input data
Input
Characteristics
Conditions
min
7
PSB 5A7
typ
max
40
1.9
6.3
7.3
45
75
5
40
100
15
100
B
150
5
40
180
15
100
B
40
150
5
40
180
15
100
B
A
µs
min
8
PSB 5A6
typ
max
80
2.9
7.3
35
mA
A
µs
min
15
PSB 125
typ
max
80
3
Unit
V DC
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 UVL
I
i NL
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
I
o
= 0,
V
i min
–
V
i max
Peak value of inrush current
V
i nom
without option L
Rise time
Time to half-value
Peak value of inrush current
V
i nom
with option L
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
Table 2b: Input data
Input
Characteristics
Conditions
min
19
PSB 155
typ
max
80
4
7.3
12
35
150
5
40
180
15
100
B
150
5
40
180
15
100
B
35
150
5
40
180
15
100
B
A
µs
min
29
PSB 245
typ
max
80
5
19
40
mA
A
µs
min
42
PSB 365
typ
max
80
6
1
Unit
V DC
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
I
o
= 0 –
I
o nom
T
C min
–
T
C max
I
o
= 0,
V
i min
–
V
i max
Peak value of inrush current
V
i nom
without option L
Rise time
Time to half-value
Peak value of inrush current
V
i nom
with option L
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
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)
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–
04016
Vo+
Go–
Fig. 2
Switching regulator with long supply lines.
REV. OCT 17, 2003
Page 3 of 13
PSB Series Extended Data Sheet
Positive Switching Regulator (Industrial)
Electrical Output Data
General Conditions:
–
T
A
= 25°C, unless
T
C
is specified
– R pin not connected, with opt. P,
V
o
adjusted to
V
o nom
at
I
o nom
Table 3a: Output data
Output
Characteristics
Conditions
min
5.07
0
7.0
15
19
25
10
120
40
±1
±0.02
PSB 5A7
typ
max
5.13
7.0
9.1
25
29
45
25
min
5.07
0
6.0
15
19
25
10
100
50
±1
±0.02
PSB 5A6
typ
max
5.13
6.0
7.8
35
39
45
25
min
11.93
0
5.0
25
29
25
20
100
60
±2
±0.02
µs
mV/K
%/K
PSB 125
typ
max
12.07
5.0
6.5
45
49
50
35
mV
mV
pp
Unit
V
A
V
o
I
o
I
oL
u
o
Output voltage
Output current
1
V
i nom
,
I
o nom
V
i min
–
V
i max
T
C min
–
T
C max
Output current limitation
response
1
Output
voltage
noise
Switching freq.
V
i nom
,
I
o nom
IEC/EN 61204
2
Total
BW = 20 MHz
Static line regulation
Static load regulation
V
i min
–
V
i max
,
I
o nom
V
i nom
,
I
o
= 0 –
I
o nom
V
o d
t
d
a
V
o
Dynamic
load
regulation
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
5.0
40
44
40
30
100
60
±3
±0.02
PSB 155
typ
max
15.09
5.0
6.5
70
74
75
65
min
23.86
0
5.0
45
50
70
70
120
80
±5
±0.02
PSB 245
typ
max
24.14
5.0
6.5
120
125
150
120
min
35.78
0
5.0
70
75
100
120
180
100
±8
±0.02
µs
mV/K
%/K
PSB 365
typ
max
36.22
5.0
6.5
180
185
200
160
mV
mV
pp
Unit
V
A
V
o
I
o
I
oL
u
o
Output voltage
Output current
1
V
i nom
,
I
o nom
V
i min
–
V
i max
T
C min
–
T
C max
Output current limitation
response
1
Output
voltage
noise
Switching freq.
V
i nom
,
I
o nom
IEC/EN 61204
2
Total
BW = 20 MHz
Static line regulation
Static load regulation
V
i min
–
V
i max
,
I
o nom
V
i nom
,
I
o
= 0 –
I
o nom
V
o d
t
d
α
V
o
Dynamic
load
regulation
Voltage deviat.
V
i nom
I
↔
1
/
3
I
o nom
Recovery time
o nom
IEC/EN 61204
2
Temperature coefficient
∆
V
o
/∆T
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. OCT 17, 2003
Page 4 of 13
PSB Series Extended Data Sheet
Positive Switching Regulator (Industrial)
V
o
Vod
05010
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 tem-
perature
T
A
may exceed 71°C, provided additional meas-
ures (heat sink, fan, etc.) are taken to ensure that the case
temperature
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
/I
ensures correct operation of the system.
I
o 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
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.
T
C max
V
o
/V
o nom
1.2
1.0
0.8
Convection cooling
I
o nom
05043
T
A min
50
60
70
80
90
100
T
A
[˚C]
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
I
o L
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. OCT 17, 2003
1.2
1.4
I
o
/I
o nom
Fig. 5
Overload, short-circuit behaviour V
o
versus I
o
Page 5 of 13
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