NMF2409SC 데이터 시트보기 (PDF) - Unspecified

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NMF2409SC

Isolated 1W Regulated Single Output DC-DC Converters

Unspecified 

NMF Series

Isolated 1W Regulated Single Output DC-DC Converters

TYPICAL APPLICATIONS

Pressure sensor, or strain gauge equivalent circuit

Scmitt Trigger

7DD

7

/.'4$

7

"OPEF

/.'4$

7065

7P

$BUIPEF

(/%

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 NMF 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?”

For a part holding no specific agency approvals, such as the NMF series, 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 NMF 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 testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage.

This consideration equally applies to agency recognised 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.

TEMPERATURE DERATING GRAPH

RoHS COMPLIANCE INFORMATION

100%

70°C

50% Safe Operating Area

125ºC

0

0

50

100

150

Ambient Temperature (ºC)

This series is compatible with RoHS soldering

systems with a peak wave solder temperature of

260ºC for 10 seconds. The pin termination finish

on the SIP package type is Tin Plate, Hot Dipped

over Matte Tin over Nickel Preplate. The DIP

types are Matte Tin over Nickel Preplate. Both

types in this series are backward compatible

with Sn/Pb soldering systems.

For further information, please visit www.murata-ps.com/rohs

www.murata-ps.com/support

KDC_NMF.H01 Page 3 of 5

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