EPR-00015 Datasheet, PDF (19/24 Pages) Power Integrations, Inc. – 3W, Universal Input, Single Output, Isolated Converter with TNY254 (EP-15)

Engineering Prototype Report
8.8 Surge Voltage
8.8.1 Differential = line-to-line (L- N), 2 ohm source impedance.
The unit exceeded the 1kV IEC/UL 1000-4-5 Class 3 requirement (meets Class 4, 2kV).
During the 2.5kV surge the unit continued to operate without damage.
8.8.2 Common mode = line-to-ground (L-GND, N-GND), 12 ohm source impedance
The unit exceeded the IEC/UL 1000-4-5 Class 3, 2kV and Class 4, 4kV requirements.
The maximum test voltage was 4kV. During the 4kV surges the unit continued to operate.
The unit was centered on the insulation side of a 6in x 4 in single sided copper clad board (1.4mm
insulation), to avoid surface or insulation breakdown during the voltage surges.
The voltage was applied between the input terminals of the unit (L or N) and the copper clad ground plane
(GND), in the following sequence:
L(+4kV) to GND, 5 times
L(-4kV) to GND, 5 times
N(+4kV) to GND, 5 times
N(-4kV) to GND, 5 times
Figure 8.8.1. Surge Test set up.
Power Cord
L
IN
N
Pwr. Ground
(P.S.U.)
Resistive Load
(Floating)
OUT
Insulation 1/16”
Copper
GND PLANE
EPR-00015
Page 19 of 24