NTA1215MC Просмотр технического описания (PDF) - Unspecified

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NTA1215MC

Isolated DC/DC Converters 1W12-9VDUAL1kV

Unspecified 

NTA Series

Isolated 1W Dual Output SM 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 NTA 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 NTA 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 NTA 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 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.

RoHS COMPLIANCE, MSL AND PSL INFORMATION

This series is compatible with RoHS soldering systems and is also backward compatible with Sn/Pb soldering systems.

The NTA series has a process, moisture, and reflow sensitivity classification of MSL1 PSL R7F as defined in J-STD-020

and J-STD-075. This translates to: MSL1 = unlimited floor life, PSL R7F = Peak reflow temperature 245°C with a

limitation on the time above liquidus (217°C) which for this series is 60sec max. The pin termination finish on this product

series is Gold with a plating thickness of 0.05 microns minimum.

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

PART NUMBER STRUCTURE

Series name

NTA XX XX M C -R

Packaging code

Input voltage

Output voltage

RoHS compliant

Package type

S - SIP

D - DIP

M - Surface mount

www.murata-ps.com/support

KDC_NTA.I09 Page 3 of 8

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