EPR-34 Datasheet, PDF (18/28 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 34 - Single Output 30 W AC-DC Power Supply

EPR-34 – 12 V, 30 W, Universal Input
10-Feb-2004
10 Thermal Performance
All measurements were made with the unit operating open frame in still air with a load of
30 W. The results show adequate thermal margin, the worst case being low line and
50 °C ambient.
Note: The thermal image does not correctly indicate the temperature of the capacitors
due to their shiney top surface.
Temperature (°C)
Item
85 115 230 85
VAC VAC VAC VAC
Ambient
29 28 28 50
Balun (L1)
54 43 36 82
Bridge (BR1)
63 49 43 92
Transformer (T1) 62 59 65 89
Clamp Zener (VR1) 55 55 48 97
TOPSwitch (U1) 68 57 55 106
Rectifier (D3)
57 56 55 88
115
VAC
50
74
83
87
89
91
85
230
VAC
52
66
73
90
85
86
85
Figure 11 - Infrared Thermograph of EP-34, 85 VAC Input, Maximum Continuous Load, 22 °C Ambient.
Power Integrations
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