1 Watt-Family
DC-DC Converters <40 W
Rugged Environment
Safety Instructions
If the output circuit of a DC-DC converter is operator-acces-
sible according to the IEC 950 related safety standards, it
shall be an SELV circuit (Safety Extra Low Voltage circuit,
i.e. a circuit, separated from mains by at least basic insula-
tion, that is so designed and protected that under normal
and single fault conditions, the voltage between any two
conductors and between any conductor and earth does not
exceed DC 60 V).
In the following section an interpretation is provided of the
IEC 950 safety standard with respect to the safety status of
the output circuit. However, it is the sole responsibility of the
installer or user to assure the compliance with the relevant
and applicable safety standards.
If the following table is observed, the output of any DC-DC
converter is considered to be an SELV circuit up to a nomi-
nal output voltage of 30 V (2 x 15 V in series).
Table 2: Insulation concept for SELV circuits
Nominal Minimum required grade Maximum Minimum required
Minimum required grade of
isolation between the input
Resulting safety
status of the
mains
of isolation, to be
output
safety status of the
supply
provided by the AC-DC
voltage
front end output circuit
and the output of the DC-DC DC-DC converter
voltage front end, including mains from the
converter, provided by
the converter
output circuit
(AC)
supplied battery charger front end
≤250 V
Basic
≤60 V
≤60 V
Earthed SELV circuit 1
SELV circuit
Operational
Operational
SELV circuit
SELV circuit
Double or reinforced
1
The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC 950.
Immunity to Environmental Conditions
Thermal Considerations
Table 3: Temp. specification values given are valid for air pressures in the range 800...1200 hPa (800...1200 mbar)
Characteristics
Conditions
Standard -N
Option -T
Option -S
Unit
min
0
max
71
min
max
71
min
–40
–40
max
TA
TC
TS
Ambient temperature
Ui min...Ui max
Io = 0...Io nom
–25
–25
–55
85
°C
Case temperature
0
91
91
105
Storage temperature
not operational
105
The case temperature TC must not exceed the maximum value. In applications with limited air circulation, additional meas-
ures must be taken (either larger spacing or a fan) to avoid case temperatures higher than TC max
!
Table 4: MTBF
Values at specified
Case Temperature
Modules Types
Ground Benign
40°C
Ground Fixed
Ground Mobile
Unit
40°C
70°C
40°C
70°C
60'000
45'000
MTBF according to
MIL-HDBK-217F
Single output
7'400'000
5'700'000
3'200'000 260'000
2'500'000 200'000
880'000
670'000
h
Double and dual outputs
6 - 4
Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
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