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PSB Series Data Sheet
?
? Connecting the input to a secondary circuit, which is
subject to a maximum transient rating of 1500 V.
The switching regulators are subject to manufacturing
surveillance in accordance with the above mentioned
standards and with ISO 9001:2000.
Isolation
Electric strength test voltage between input connected with
output against case: 1500 VDC, ≥ 1 s (for some PSB models
only with version V103 or higher).
Description of Options
-9 Extended Temperature Range
This option defines an extended temperature range as
Positive Switching Regulators
These tests are performed in the factory as routine test in
accordance with EN 50116 and IEC/EN 60950. The electric
strength test should not be repeated by the customer.
Railway Application
The regulators have been developed observing the railway
standards EN 50155 and EN 50121. All boards are coated with
a protective lacquer.
With option L, the maximum permissible additionally super-
imposed 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 ? 1V
specified in table 7.
C
Thyristor Crowbar
P Potentiometer
Note: Option P is not recommended, if several regulators are
operated in parallel connection.
Option P excludes R function; the R-input (pin 16) should be
left open-circuit. The output voltage V o can be adjusted in the
range 90 – 110% of V o nom .
However, the minimum differential voltage ? V i o min between
input and output specified in Electrical Input Data should be
observed.
Option C protects the load against power supply malfunction. It
is not designed to sink external currents. A fixed-value
monitoring circuit checks the output voltage V o . When the
trigger voltage V o c is reached, the thyristor crowbar triggers and
disables the output. It may be deactivated by removal of the
input voltage. In case of a defect switching transistor, the
internal fuse prevents excessive current.
Note : The crowbar can be reset by removal of the input voltage
only. The inhibit signal cannot deactivate the thyristor.
L Input Filter
Option L is recommended to reduce superimposed inter-
G
RoHS Compliance
ference voltages and to prevent oscillations, if input lines
exceed the length of approx. 5 m in total. The fundamental
wave (approx. 120 kHz) of the reduced interference voltage
between Vi+ and Gi– has, with an input line inductance of
5 μH, a maximum magnitude of 4 mVAC.
The input impedance of the switching regulator at 120 kHz is
about 3.5 ? . The harmonics are small in comparison with the
fundamental wave.
Table 9: Crowbar trigger levels
Models with G are RoHS-compliant for all six substances.
Characteristics
Conditions
V o = 5.1 V
V o = 12 V
V o = 15 V
V o = 24 V
V o = 36 V
Unit
V o c Trigger voltage T C min – T C max
min
5.8
typ
max min
6.8 13.5
typ
max min
16
16.5
typ
max
19
min
27
typ
max
31
min
40
typ max
45
V
t s
Delay time
V i min – V i max
I o = 0 – I o nom
1.5
1.5
1.5
1.5
1.5
μs
BCD20026-G Rev AA, 18-May-2011
Page 14 of 15
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