QNT Triple Output DC-DC Series Data Sheet
80W • 48V Input • 0.95V to 5V Outputs
Safety Considerations
EMC Specifications
These converters feature 1500 Volt DC isolation from
input to output. The input to output resistance is
greater than 10MΩ. These converters are provided
with Basic insulation between input and output circuits
according to all IEC60950 based standards.
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.
Please observe the PCB keep-out areas shown in the
Mechanical Drawings. These documents include
UL60950 - CSA60950-00 and EN60950, although
specific applications may have other or additional
requirements.
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).
The results for this solution are displayed below.
To meet level B for the above standards it may be
necessary to fit a filter circuit across the input
terminals. (Consult factory for application note).
dbµV
Conducted EMI (Input Terminals)
80
70
60
50
40
30
20
10
0
EN55022
A
QP.
AV.
EN55022 A
In order for the output of the converter to be
considered as SELV (Safety Extra Low Voltage) or
TNV-1, according to all IEC60950 based standards,
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
greater than 5.0A 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 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.
0.1
1
10
30
1.E+05
1.E+06
1.E+07
1.E+08
FREQ (MHz)
Electromagnetic Susceptibility:
Standard
Applied
Stress
Class Performance
Level
Outcome *
Electrostatic
Discharge
EN61000-4-2
Electromagnetic
Field
EN61000-4-3
Electrical Fast
Transient
EN61000-4-4
Conducted
Disturbances
EN61000-4-6
2KV to
pins
1
B
3V/m
2
3
2
A
B
B
• If the voltage source feeding the module is SELV,
the output of the converter is considered SELV and
may be grounded or ungrounded.
2000Vp
to input
The components on the converter carry transients that
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.
3Vrms to
input
*A denotes normal operation, no deviation from specification.
*B denotes temporary deviation from specification is possible.
REV. JAN 31, 2005
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