EPR-00010 Datasheet, PDF (21/24 Pages) Power Integrations, Inc. – 15W, Universal Input, Single Output, Isolated Converter with TOP233Y

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).
The CX1 capacitor failed after more than 20 2.5kV surges.
During the 2.5kV surge, the unit turns off for approximately 1.8 seconds.
100V/div, 500msec/div
DC voltage level at
230Vac, 60 Hz.
ON
OFF
ON
Power Supply State
Figure 8.8.1 C1 (DC bus) voltage after the 2.5kV surge.
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 6kV. During the 6kV surges, the unit continues to operate.
The unit was centered on the insulation side of a 6 in x 4 in single sided copper clad
board (1/16 in 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(+6kV) to GND , 5 times
L(-6kV) to GND , 5 times
N(+6kV) to GND , 5 times
N(-6kV) to GND , 5 times
EPR-00010
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