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AN4248 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN4248
Description  60 W PSU design details for water purifier system
PDF  46 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4248 Datasheet(HTML) 17 Page - STMicroelectronics

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DocID024214 Rev 1
17/46
AN4248
Basic power stage calculations
Peak MOSFET voltage, Vds = Vinmax+ VR+Spike,
Where Vinmax should be taken where mains OVP cut is required, lets take it at 420 V.
So Vds = 420+140+100 = 660 V, use an 800 V MOSFET to obtain a good, safe margin.
Select STP10NK80Z.
Rectifier max reverse voltage:
Equation 18
–Vrev = 96 V
–
Use 120 V Schottky
–
Select 2xSTPS20120CFP parallel



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