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參數資料
| 型號： | 40IMX35-12-12-9 |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 35 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數： | 9/18頁 |
| 文件大?。?/td> | 375K |
| 代理商： | 40IMX35-12-12-9 |
Board Mountable
DC-DC Converters
IMX 35 Series
Edition 3/4.2000
17/18
Table 19: Insulation concept leading to an SELV output circuit
Conditions
Front end
DC-DC converter
Result
Supply
Minimum required grade
Maximum
Minimum required
Type
Measures to achieve the
Safety status of
voltage
of isolation, to be provided DC output
safety status of the
specified safety status of
the DC-DC
by the AC-DC front end,
voltage
front end output
the output circuit
converter output
including mains supplied
from the
circuit
battery charger
front end 1
Mains
Basic
≤60 V
Earthed SELV circuit 2 IMX 35
Operational insulation
SELV circuit
≤250 V AC
(provided by the DC-DC
converter)
≤75 V
Hazardous voltage
IMX 35
Input fuse 3 output sup-
Earthed SELV
secondary circuit
pressor diodes 4, and
circuit
earthed output circuit 2
Double or reinforced
≤60 V
SELV circuit
IMX 35
Operational insulation
(provided by the DC-DC
converter)
≤75 V
Double or reinforced
IMX 35
Supplementary insulation
insulated unearthed
based on the maximum
hazardous voltage
rated output voltage from
secondary circuit 5
the front end (provided by
the DC-DC converter)
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 the 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 42 V.
However, it is the sole responsibility of the installer to en-
sure the compliance with the relevant and applicable safety
regulations. More information is given in:
Technical Infor-
mation: Safety.
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 at least basic insulation according to the relevant safety standard, based on the maximum output
voltage from the front end.
AC-DC
front
end
DC-DC
con-
verter
Mains
Fuse
Battery
Earth
connection
Suppressor
diode
SELV
Earth
connection
+
–
~
10004
Fig. 23
Schematic safety concept. Use fuse, suppressor diode
and earth connection as per table: Safety concept leading
to an SELV output circuit
.
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