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AN1376 Datasheet(PDF) 27 Page - STMicroelectronics

Part # AN1376
Description  25W QUASI-RESONANT FLYBACK CONVERTER FOR
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1376 Datasheet(HTML) 27 Page - STMicroelectronics

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AN1376 APPLICATION NOTE
The highest temperatures are for the NTC thermistor, the filter inductor, the input bridge, the
clamp diode (D9), the 5V regulator and the output diodes D7 and D6. The temperature rise of
the transformer is around 40 °C.
Regarding the thermistor, the bridge and the output diodes the temperature rise is compatible
with reliable operation of the circuit.
Figure 29.
At 220Vac the input circuitry is thermally less stressed and generally the component temper-
ature rise is lower.
@220VAC - FULL LOAD
COMPONENT SIDE
A 39.31°C
B 54.21°C
C 80.15°C
D 60.05°C
E 72.00°C
SMD SIDE



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