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CRE1 Fiches technique(PDF) 2 Page - Murata Power Solutions Inc.

No de pièce CRE1
Description  Isolated 1W Single Output Isolated DC-DC Converters
Download  14 Pages
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Fabricant  MURATA-PS [Murata Power Solutions Inc.]
Site Internet  http://www.murata-ps.com
Logo MURATA-PS - Murata Power Solutions Inc.

CRE1 Fiches technique(HTML) 2 Page - Murata Power Solutions Inc.

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CRE1 Series
Isolated 1W Single Output Isolated DC-DC Converters
KDC_CRE1.D02 Page 2 of 14
www.murata-ps.com/support
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
Min.
Typ.
Max.
Units
Specification
All output types1
-40
85
°C
Storage
-50
130
Case temperature rise above
ambient
5V output types
41
All other output types
32
CRE1S0505MC
43
CRE1S0505MEC
12.5
Cooling
Free air convection
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 CRE1 series of DC-DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second for C versions and 3kVDC for
1 second for 3C versions.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The CRE1 series, through hole variants (excluding surface mount variants) have been recognised 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 offset 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 materials,
construction and environment. The CRE1 series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enamelled 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 testing, 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 functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
SAFETY APPROVAL
The CRE1 series has been recognised by Underwriters Laboratory (UL) to UL60950 for functional insulation in a maximum still air ambient temperature of 100°C for the C versions
and 130°C for the 3C versions as measured on the case of the unit (hotspot). The CRE1S0505MC is not currently UL recognised.
The CRE1 series of converters are not internally fused so to meet the requirements of UL60950 an anti-surge input line fuse should always be used with ratings as defined below.
CRE1S03xxS3C: 1A
CRE1S05xxxxC: 0.7A
CRE1S12xxSC: 0.2A
CRE1S24xxSC: 0.16A
All fuses should be UL recognised, 125V rated.
File number E151252 applies.
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
260°C
Input voltage VIN, 3.3V input
5.5V
Input voltage VIN, 5V input
7V
Input voltage VIN, 12V input
15V
Input voltage VIN, 24V input
28V
1. 24V input parts prior to date code D1635 have operating temperature range of 0 to 70°C.


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