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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.

Professional Power Module E_XS&F_XS series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 3KVDC for 1 minute.

A question commonly asked is,"What is the continuous voltage that can be applied across the part in normal operation?"

The E_XS&F_XS series 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 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-amissible 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. 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 for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation

system of physical spacing or barriers.

EFFICIENCY

LOAD

2F05(XX)XS

2F12(XX)XS

2E05(XX)XS

2E12(XX)XS

CHARACTERISATION

METHODS

Ripple & Noise Characterization Method

Ripple and noise measurements are performed with the following test configuration.

C1

1uF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter

C2

10uF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter

with an ESR of less than 100mΩ at 100KHz

C3

100nF multilayer ceramic capacitor, general purpose

R1

450Ω resistor, carbon film,+/-1% tolerance

R2

50Ω BNC termination

T1

3T of the coxa cable through a ferrite toroid

RLOAD

Resistive load to the maximum power rating of the DC/DC converter. Connections should be made via twisted wires

Measured values are multiplied by 10 to obtain the specified values.

Differential Mode Noise Test Schematic