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EPR-32 датащи(PDF) 21 Page - Power Integrations, Inc.

номер детали EPR-32
подробное описание детали  Engineering Prototype Report for EP-32 − TOPSwitch-GX 25 W Multiple Output DVD, Set-top Box Power Supply Using TOP245P
PDF  36 Pages
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производитель  POWERINT [Power Integrations, Inc.]
домашняя страница  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

EPR-32 датащи(HTML) 21 Page - Power Integrations, Inc.

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13-Jul-06
EPR-32 - 25 W Multiple Output TOP245P Supply
Page 21 of 36
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
10 Thermal Performance
The temperature of key components was measured at the maximum specified ambient of
50
°C. In addition to checking for hotspots, an infrared thermograph was taken at room
ambient (as this is output as a color profile, please use the color version of this
document, available at www.powerint.com/epr.htm, to review the temperatures).
Temperature (
°C)
Item
90
VAC
115
VAC
230
VAC
Ambient
51
51.4
51
Common Mode (L1)
90
82
67
Transformer (T1)
85
79
83
TOPSwitch-GX (U1)
102
93
80
5 V Rectifier (D11)
112
112
113
3.3 V Rectifier (D10)
107
99
98
Table 4
− Temperature of Key Components, 50 °C Ambient.
Figure 11 –
Infrared Thermograph (with silk screen overlaid) of EP-32, 90 VAC Input, 20 W Load
(5 V at 2 A, 3.3 V at 2 A, 12 V at 0.28 A, -24 V at 0 A), 23 °C Ambient.
In order to make the thermograph representative of the actual component temperatures,
the entire board was spray painted black to give a uniform emissivity value.
The thermograph shows the hottest parts to be the input thermistor RT1, TOP245P, VR1,
R1 in the clamp, and D11, the 5 V output diode. The highest temperature measured was
80 °C on R1, however, all components would remain acceptably less than 110 °C in an
ambient of 50 °C.



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