PSC5A12-7iR Power-One AG, PSC5A12-7iR Datasheet - Page 11

• Manufacturer Part Number: PSC5A12-7iR
• Description: Positive Switching Regulators
• Manufacturer: Power-One AG

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Description of Options
-9 Extended Temperature Range
The operational ambient temperature range is extended to
T
P Potentiometer
Option P excludes R function. The output voltage V
adjusted with a screwdriver in the range from 0.92 - 1.08 of
the nominal output voltage V
However, the minimum differential voltage D V
input and output voltages as specified in: Electrical Input
Data should be maintained.
L Input Filter
Option L is recommended to reduce superimposed inter-
ference voltages and to prevent oscillations, if input lines
exceed approx. 5 m in total length. The fundamental wave
(approx. 120 kHz) of the reduced interference voltage be-
tween Vi+ and Gi– has, with an input line inductance of
5 µH, a maximum magnitude of 4 mVAC. A reduction can
be achieved by insertion of a capacitor across the input
(e.g. plastic foil between Vi+ and Gi–).
The input impedance of the switching regulator at 120 kHz
is about 3.5 Ω. The harmonics are small in comparison with
the fundamental wave. See also: Electrical Input Data: RFI .
D Save Data Input Undervoltage Monitor
Terminal D and Go– are connected to a normally conduct-
ing field effect transistor (JFET). The switching characteris-
tics of the option D output are shown in fig. Definition of V
and V
overvoltages.
The voltage V
tiometer by means of a screwdriver. The hysteresis V
is <2%. Terminal D stays low for a minimum time t
order to prevent any oscillation. V
between V
comes conductive when V
Table 10: Crowbar trigger levels
REV. MAY 12, 2004
V
t
A
Note: Output instead of input undervoltage monitor is
Characteristics
s
o c
= –40 to 71°C. ( T
H
Trigger voltage
Delay time
. A 0.5 W Zener diode provides protection against
available on request (Option D1).
i min
t
can be externally adjusted with a trim poten-
and V
C
i max
= –40 to 95°C, T
Conditions
V
I
T
o
C min
i min
= 0 - I
. Please note that the JFET be-
D
- V
- T
increases above 7 V approx.
o nom
o nom
i max
C max
.
t
can be set to a value
min
5.8
S
= –55 to 100°C.)
5.1 V
max
i o min
6.8
1.5
between
low min
o
can be
H
13.5
min
Page 11 of 13
of V
, in
12 V
Positive Switching Regulators (Industrial)
t
t
max
1.5
16
With option L, the maximum permissible additionally su-
perimposed ripple u
a specified input frequency f
Units with max input voltage 40 V:
Units with max input voltage 80 V:
C Crowbar
This option is recommended to protect the load against
power supply malfunction, but it is not designed to sink ex-
ternal currents.
A fixed-value monitoring circuit checks the output voltage
V
crowbar triggers and disables the output. It may be deacti-
vated by removal of the input voltage. In case of a switching
transistor defect, an internal fuse prevents excessive cur-
rent.
Note: As a central overvoltage protection device, the crow-
bar is usually connected to the external load via distributed
inductance of the lines. For this reason, the overvoltage at
the load can temporarily exceed the trigger voltage V
pending on the application, further decentralized over-
voltage protection elements may have to be used addition-
ally.
V
Fig. 13
Test circuit with definition of voltage V
o
t
. When the trigger voltage V
u
u
i max
i max
16.5
Gi –
Vi +
min
PSC Series Extended Data Sheet
15 V
= 12 V
= 22 V
max
1.5
JFET
19
pp
pp
at 100 Hz or V
at 100 Hz or V
i
of the input voltage (rectifier mode) at
min
27
24 V
8.2 V
max
Go –
1.5
31
i
has the following values:
D
o c
pp
pp
is reached, the thyristor
= 1200 Hz/ f
= 2200 Hz/ f
V
min
I
40
D
D
D
36 V
and current I
max
45.5
1.5
10 kΩ
100 pF
i
i
• 1V
• 1V
Unit
11025
o c
µs
V
D
. De-
+5 V
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