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RND DC-DC Series Data Sheet
10W SMT Converter ? 3.3V & 5V to ± 15V Dual
Safety Considerations
These converters feature 1500 VDC isolation from
input to output. The input-to-output resistance is
greater than 10M ? . These converters are provided
with Basic Insulation between input and output
circuits according to EN60950 / UL1950 /
CSA60950-00. Nevertheless, if the system using
the converter needs to receive safety agency
approval, certain rules must be followed in the
design of the system. In particular, all of the
creepage and clearance requirements of the end-use
safety requirements must be observed. These
documents include UL60950, CSA60950-00 and
EN60950, although specific applications may have
EMC Specifications
Conducted Noise:
The converters meet the requirements of EN55022,
CISPR22 and FCC CFR title 47 part 15 Sub-part J -
Conducted (conducted noise on the input terminals)
without any external components. The results for this
solution are displayed below.
To meet level B for the above standards it is
necessary to fit a 3.3 μ F ceramic capacitor across
the input terminals.
additional requirements.
In order for the output of the converter to be
considered as SELV (Safety Extra Low Voltage) or
TNV-1, according to EN60950 / UL1950 /
CSA60950-00, one of the following requirements
must be met in the system design:
? The converter has no internal fuse. An external
fuse must be provided to protect the system from
catastrophic failure. A fuse with a rating not
dbμV
80
70
60
50
40
30
20
Conducted EMI (Input Term inals)
EN55022 A QP .
EN55022 A A V.
greater than 2.0 A is recommended. The user
can select a lower rating fuse based upon the
inrush transient and the maximum input current of
the converter, which occurs at the minimum input
voltage. Both input traces and the chassis
10
0
1.E+05
1.E+06
FREQ (MHz)
1.E+07
30
1.E+08
ground trace (if applicable) must be capable of
conducting a current of 1.5 times the value of the
fuse without opening. The fuse must not be
placed in the grounded input line, if any.
Electromagnetic Susceptibility:
Standard
Applied
Class
Performance
? If the voltage source feeding the module is SELV,
the output of the converter is considered SELV
and may be grounded or ungrounded.
? The circuitry on the converter carry transients,
which exceed the input voltage. Even if the input
voltage is SELV (<60V) the components on the
primary side of the converter may have to be
considered as hazardous. A safety interlock may
be needed to prevent the user from accessing the
converter while operational.
Electrostatic
Discharge
EN61000-4-2
Electromagnetic
Field
EN61000-4-3
Electrical Fast
Transient
EN61000-4-4
Conducted
Disturbances
EN61000-4-6
Stress
2 kV to
pins
3V/m
2000 Vp
to input
3Vrms to
input
Level
1
2
3
2
Outcome *
B
A
B
B
* A denotes normal operation, no deviation from
specification. B denotes temporary deviation from
specification is possible.
MCD10214 Rev. 1.0, 20-Aug-10
Page 12 of 16
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