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參數(shù)資料
| 型號(hào)： | 48IMS25-15-9 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 24 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 3/11頁(yè) |
| 文件大?。?/td> | 225K |
| 代理商： | 48IMS25-15-9 |
Board Mountable
DC-DC Converters
IMS 25 Series
Edition 2/4.2000
11/11
AC-DC
front
end
DC-DC
con-
verter
Mains
Fuse
Battery
Earth
connection
Suppressor
diode
SELV
Earth
connection
+
–
~
10004
Fig. 14
Schematic safety concept. Use fuse, suppressor diode
and earth connection as per table: Safety concept leading
to an SELV output circuit
.
Table 14: Insulation concept leading to an SELV output circuit
Conditions Front end
DC-DC converter
Result
Supply
Minimum required grade
Maximum
Minimum required safety
Measures to achieve the
Safety status of
voltage
of isolation, to be provided DC output
status of the front end
specified safety status of the
the DC-DC
by the AC-DC front end,
voltage
output circuit
converter output
including mains supplied
from the
circuit
battery charger
front end 1
Mains
Basic
≤60 V
Earthed SELV circuit 2
Operational insulation (pro-
SELV circuit
≤250 V AC
vided by the DC-DC converter)
ELV circuit
Input fuse 3 output suppressor
Earthed SELV
>60 V
Hazardous voltage
diode(s) 4, and earthed
circuit
secondary circuit
output circuit(s) 2
Double or reinforced
≤60 V
SELV circuit
Operational insulation (pro-
SELV circuit
vided by the DC-DC converter)
>60 V
TNV-2 circuit
Supplementary insulation,
Double or reinforced insu-
based on the maximum input
lated unearthed hazardous
voltage (provided by the
voltage secondary circuit 5
DC-DC converter)
1 The front end output voltage should match the specified input voltage range of the DC-DC converter.
2 The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950.
3 The installer shall provide an approved fuse (type with the lowest rating suitable for the application) in a non-earthed input line directly
at the input of the DC-DC converter (see fig.:
Schematic safety concept). For UL’s purpose, the fuse needs to be UL-listed. See also:
Input Fuse.
4 Each suppressor diode should be dimensioned in such a way, that in the case of an insulation fault the diode is able to limit the output
voltage to SELV (<60 V) until the input fuse blows (see fig.:
Schematic safety concept).
5 Has to be insulated from earth by basic insulation according to the relevant safety standard, based on the maximum output voltage
from the front end.
Description of Option
Option i Inhibit
Excluces shut down
The output(s) of the converter may be enabled or disabled
by means of a logic signal (TTL, CMOS, etc.) applied to the
inhibit pin. No output voltage overshoot will occur when the
unit is turned on. If the inhibit function is not required the
inhibit pin should be connected to Vi– to enable the output
(active low logic, fail safe).
Converter operating:
–10 V...0.8 V
Converter inhibited or
inhibit pin left open circuit
2.4...5 V
Fig. 15
If the inhibit is not used the inhibit pin should be con-
nected to Vi–
Vi+
Vi –
i
06070
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