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參數(shù)資料
| 型號(hào)： | 48IMP3-1212-7S |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 3 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數(shù)： | 7/7頁 |
| 文件大?。?/td> | 179K |
| 代理商： | 48IMP3-1212-7S |
Board Mountable
DC-DC Converters
IMP 3 Series
Edition 5/5.2000
7/6
Safety of operator accessible output circuit
If the output circuit of a DC-DC converter is operator acces-
sible, it shall be an SELV circuit according to IEC/EN 60950
related safety standards
The following table shows some possible installation con-
figurations, compliance with which causes the output circuit
of the DC-DC converter to be an SELV circuit according to
IEC/EN 60950 up to a configured output voltage (sum of
nominal voltages if in series or +/
–
configuration) of 30 V.
However, it is the sole responsibility of the installer to as-
sure the compliance with the relevant and applicable safety
regulations. More information is given in: Technical Infor-
mation: Safety
AC-DC
front
end
DC-DC
con-
verter
Mains
~
Fuse
Battery
Earth
connection
Suppressor
diode
SELV
Earth
connection
+
–
~
10004
Fig. 8
Schematic safety concept. Use fuse, suppressor diode
and earth connection as per table: Safety concept leading
to an SELV output circuit.
Table 10: Insulation concept leading to an SELV output circuit
Conditions Front end
DC-DC converter
Result
Supply
voltage
Minimum required grade
of isolation, to be provided DC output
by the AC-DC front end,
including mains supplied
battery charger
Maximum
Minimum required safety
status of the front end
output circuit
Measures to achieve the
specified safety status of the
output circuit
Safety status of
the DC-DC
converter output
circuit
voltage
from the
front end
1
Mains
≤
250 V AC
Basic
≤
60 V
Earthed SELV circuit
2
Operational insulation, pro-
vided by the DC-DC converter
SELV circuit
ELV circuit
Input fuse
3
output suppressor
diodes
4
, and earthed
output circuit
2
Earthed SELV
circuit
>60 V
Hazardous voltage
secondary circuit
Double or reinforced
≤
60 V
SELV circuit
Operational insulation, pro-
vided by the DC-DC converter
SELV circuit
>60 V
TNV-2 circuit
Earthed output circuit
2
Earthed SELV
circuit
TNV-3 circuit
(only with IXP units)
Double or reinforced insu-
lated unearthed hazardous suppressor diodes
4
voltage secondary circuit
5
Input fuse
3
and output
SELV circuit
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 conductor
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 double or reinforced insulation according to the relevant safety standard, based on the maximum
output voltage from the front end.
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