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AN3011 Datasheet(PDF) 28 Page - STMicroelectronics

No. de pieza AN3011
Descripción Electrónicos  In certain applications such as LCD or plasma TVs
PDF  37 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3011 Datasheet(HTML) 28 Page - STMicroelectronics

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Doc ID 16043 Rev 1
Figure 29.
Second overcurrent protection - protection tripping
In Figure 29, when the board is working in full-load condition with an input voltage of 115
VAC, the secondary winding is shorted. If the converter runs with the secondary winding
shorted, there is a very high current flowing through the transformer windings, the
secondary diode, and the VIPer power section. The second over-current protection, which
stops the converter operation after two switching cycles, prevents the flow of these high
currents. Figure 30 shows the situation when a permanent short-circuit is applied on the
secondary winding. Most of the time the power section of the VIPer is off, eliminating any
risk of overheating.
Figure 30.
Operating with the secondary winding shorted. Restart mode



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