psb243-7ir Power-One, psb243-7ir Datasheet - Page 12

• Manufacturer Part Number: psb243-7ir
• Description: Psb Series Extended Positive Switching Regulators Rugged
• Manufacturer: Power-One

REV. OCT 17, 2003
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
be adjusted with a screwdriver in the range from 92 -
108% V
However, the minimum differential voltage D V
tween input and output voltages as specified in: Electrical
Input Data should be maintained.
C Thyristor 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 switch-
ing transistor defect, an internal fuse prevents excessive
current.
Accessories
A variety of electrical and mechanical accessories are
available including:
– PCB-tags and isolation pads for easy and safe PCB-
– Ring core chockes for ripple and interference reduction.
For more detailed information please refer to: Accessory
Products on the Power-One homepage.
Table 10: Crowbar trigger levels
V
t
o
Characteristics
s
mounting.
. When the trigger voltage V
o c
A
= –40 to 71°C. ( T
Trigger voltage
Delay time
o nom
.
C
Conditions
V
I
T
o
= –40 to 95°C, T
C min
i min
= 0 - I
- V
- T
o nom
i max
C max
o c
is reached, the thyristor
min max
5.8
5.1 V
S
= –55 to 100°C.)
6.8
1.5
i o min
13.5
min max
o
12 V
Page 12 of 13
can
be-
1.5
16
Positive Switching Regulators (Rugged)
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 80 mV
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 17 . The harmonics are small in comparison
with the fundamental wave. See also: Electrical Input
Data: RFI .
With option L, the maximum permissible additionally su-
perimposed ripple u
a specified input frequency f
Note: As a central overvoltage protection device, the
crowbar is usually connected to the external load via dis-
tributed inductance of the lines. For this reason, the over-
voltage at the load can temporarily exceed the trigger volt-
age V
ized overvoltage protection elements may have to be used
additionally. For further information see: Technical Infor-
mation: Application Notes.
16.5
min max
u
15 V
i max
o c
1.5
PSB Series Extended Data Sheet
19
. Depending on the application, further decentral-
= 10 V
min max
27
pp
24 V
at 100 Hz or V
i
1.5
31
of the input voltage (rectifier mode) at
min max
40
i
36 V
has the following values:
45.5
1.5
pp
= 1000 Hz/ f
rms
min max
55
. A reduction can
48 V
1.5
60
i
• 1V
Unit
µs
V