WPMIx9200501S / 1779205x4

FISM

– Fixed Isolated SIP Module

we-online.com

Würth Elektronik eiSos GmbH & Co. KG

– Data Sheet Rev. 1.0

©July 2016

8/21

DIELECTRIC STRENGTH TEST SETUP (HIGH POT TEST)

+VIN

1

7

2

-VIN

5

+VOUT

-VOUT

DC

DC

Sup ply

Connect all input

– and output terminals together (see Figure) before connecting the supply voltage. When testing, set the

cut-off current to 1mA.

Parameters Supply Device: Current limit set to 1mA, Test voltage 4000Vdc, Test time 1sec.

REPEATED HIGH-VOLTAGE ISOLATION TESTING

A repeated high voltage test of a barrier component will degrade its isolation capabilities.

The primary and secondary windings within this transformer are enameled (coated) but do not possess additional isolation.

Typically, parts can withstand many times their stated test voltage and still perform optimally. The enamel coating can

degrade over time due to chemical reactions that occur at high voltages. We recommend keeping high voltage isolation

testing to a minimum to better protect the isolation between the windings. If repeated high voltage isolation testing is

required, consider reducing the voltage by a significant amount e.g. 20% from the test voltage stated within the datasheet.

These safety concerns are equally applicable to components that utilize functional isolation beyond wire enamel (i.e.

physical barriers or spacing).