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AN4248 датащи(PDF) 14 Page - STMicroelectronics

номер детали AN4248
подробное описание детали  60 W PSU design details for water purifier system
PDF  46 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4248 датащи(HTML) 14 Page - STMicroelectronics

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Output overvoltage protection (ZCD setting)
AN4248
14/46
DocID024214 Rev 1
Equation 6
Where
–
VoutOVP = output voltage level that is to activate the protection
–
Ns = number of turns of secondary winding
–
Naux = number of turns of the auxiliary winding
The value of RZ1 will be such that the current sourced by the ZCD pin is within the rated
capability of the internal clamp:
Equation 7
where
–Vinmax= maximum DC input voltage.
Referring to the schematic, RZ1=R17 and RZ2=R25. Based on the above relations and
transformer turns ratio, R17=47 K and R25=10 K.



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