MEE1S0303SC Datasheet, PDF (6/7 Pages) Murata Power Solutions Inc. – Isolated 1W Single Output DC/DC Converters

MEE1 Series
Isolated 1W Single Output DC/DC Converters
TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand
Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test
voltage, applied for a specified time, across a component designed to provide electrical
isolation, to verify the integrity of that isolation.
Murata Power Solutions MEE1 series of DC/DC converters are all 100% production
tested at their stated isolation voltage. This is 1kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied
across the part in normal operation?”
The MEE1 has been recognized by Underwriters Laboratory for functional insulation,
both input and output should normally be maintained within SELV limits i.e. less than
42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to
transient voltages and the part should never be used as an element of a safety isolation
system. The part could be expected to function correctly with several hundred volts off-
set applied continuously across the isolation barrier; but then the circuitry on both sides
of the barrier must be regarded as operating at an unsafe voltage and further isolation/
insulation systems must form a barrier between these circuits and any user-accessible
circuitry according to safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can
actually degrade isolation capability, to a lesser or greater degree depending on materi-
als, construction and environment. The MEE1 series has toroidal isolation transformers,
with no additional insulation between primary and secondary windings of enameled
wire. While parts can be expected to withstand several times the stated test voltage,
the isolation capability does depend on the wire insulation. Any material, including this
enamel (typically polyurethane) is susceptible to eventual chemical degradation when
subject to very high applied voltages thus implying that the number of tests should be
strictly limited. We therefore strongly advise against repeated high voltage isolation test-
ing, but if it is absolutely required, that the voltage be reduced by 20% from specified
test voltage.
This consideration equally applies to agency recognized parts rated for better than func-
tional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
DIP Package
9.80 (0.386)
MEE1S0505DC
XYYWW
SIP Package
11.48
(0.45)
6.00
(0.236)
11.50 (0.453)
6.80 (0.268)
4.60 (0.181)
3.60 (0.142)
1.09 (0.043)
0.30 (0.0118)
0.20 (0.0078)
10.0
(0.394)
MEE1S0505SC
XYYWW
0.55 (0.022)
0.45 (0.018)
0.55 (0.022)
0.45 (0.018)
1
4
4.60 (0.181)
3.60 (0.142)
7.62 (0.3)
75
5.08 (0.2)
7.62 (0.3)
1.94 (0.0764)
1.25
(0.049)
1234
1.69 (0.067)
2.41 (0.094)
0.55 (0.022)
0.45 (0.018)
0.30 (0.0118)
0.20 (0.0078)
7.62
(0.3)
Weight: 1.28g (SIP), 1.56g (DIP)
All dimensions in mm ±0.25mm (inches ±0.01). All pins on a 2.54 (0.1) pitch and within ± 0.25 (0.01) of true position.
PIN CONNECTIONS - 8 PIN DIP
Pin
Function
1
-VIN
4
+VIN
5
+VOUT
7
-VOUT
PIN CONNECTIONS - 4 PIN SIP
Pin
Function
1
-VIN
2
+VIN
3
-VOUT
4
+VOUT
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KDC_MEE1.C01 Page 6 of 7