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參數(shù)資料
| 型號(hào)： | IMS30 |
| 英文描述： | Dual outputs 5V & 3.3V ; 3.3V & 1.8V |
| 中文描述： | 5V的雙輸出 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 1153K |
| 代理商： | IMS30 |
AC-DC
front
end
DC-DC
con-
verter
Mains
~
Fuse
Battery
Earth
connection
Suppressor
diode
SELV
Earth
connection
+
–
~
10004
Fig. 13
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
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
diode(s)
4
, and earthed
output circuit(s)
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
Supplementary insulation,
based on the maximum input
voltage (provided by the
DC-DC converter)
Double or reinforced insu-
lated unearthed hazardous
voltage secondary circuit
5
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:
Converter inhibited or
inhibit pin left open circuit
–10 V...0.8 V
2.4...5 V
Fig. 14
If the inhibit is not used the inhibit pin should be con-
nected to Vi–
Vi+
Vi–
i
06070
11/11
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