EPR-34 Datasheet, PDF (25/28 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 34 - Single Output 30 W AC-DC Power Supply

10-Feb-2004
EPR-34 – 12 V, 30 W, Universal Input
14 AC Surge and 100 kHz Ring Wave Immunity
Four series of line transient tests were performed on the EP-34 to determine the level of
immunity attainable for the basic board. Testing was performed using a Keytek EMC Pro
surge generator. The input voltage for the supply under test was 230 VAC, and the
supply was loaded to the maximum continuous output power using a resistive load. An
LED was used to monitor the presence of output voltage and to detect output
interruptions. The secondary return was hard wired to the safety ground at the surge
generator. This is a worst-case test condition for common mode surge and ring wave
testing, and the test results reflect this. If surge tests are conducted without this ground
connection, the common mode surge/ring wave withstand is higher. Test for each series
was terminated upon non-destructive interruption of output voltage, arcing, or non-
recoverable interruption of output voltage. A test failure was defined as a non-
recoverable interruption of output voltage requiring supply repair or recycling of input AC
voltage.
14.1 Common Mode Surge, 1.2/50 µs
Surge
Voltage
1 kV
1 kV
1 kV
2 kV
2 kV
2 kV
3 kV
3 kV
3 kV
Phase Angle (°)
0
90
270
0
90
270
0
90
270
Generator
Impedance
12 Ω
12 Ω
12 Ω
12 Ω
12 Ω
12 Ω
12 Ω
12 Ω
12 Ω
4 kV
0
12 Ω
Number of
Strikes
10
10
10
10
10
10
10
10
10
10
4 kV
90
12 Ω
10
4 kV
270
12 Ω
1
Test Result
PASS
PASS
PASS
PASS
PASS
PASS
PASS
PASS
PASS
PASS (1 power
interruption/10strikes,
recovered)
PASS (2 power
interruptions/10 strikes,
recovered)
PASS (4 power
interruptions/10 strikes,
recovered)
Page 25 of 28
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